Java多线程+PDF生成实战（笔记）

Love The Way You Lie 2023-07-18 11:24 5阅读 0赞

### 多线程实战 ###

*   *  新建项目
     *  文件配置
     *  资源配置教程
     *  单线程版开发
     *  多线程工作框架
     *   *  源码：
     *  问题
     *  总结

## 新建项目 ##

打开idea，新建一个moudle。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70]  
选择Spring Initializr，单击next，进入下一步。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 1]  
接下来，安装Spring Boot套路设置项目名称和包名。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 2]  
单击next。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 3]  
再单击next。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 4]  
单击finish完成工程的创建。工程目录结构为：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 5]

## 文件配置 ##

修改pom.xml，添加pdf和Spring等相关依赖

**pom.xml**

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.5.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.njust</groupId>
        <artifactId>pdfmutithread</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>pdfmutithread</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-freemarker</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                <version>RELEASE</version>
                <scope>compile</scope>
            </dependency>
    
            
            <dependency>
                <groupId>com.itextpdf</groupId>
                <artifactId>itextpdf</artifactId>
                <version>5.5.13</version>
            </dependency>
    
            
            <dependency>
                <groupId>com.itextpdf.tool</groupId>
                <artifactId>xmlworker</artifactId>
                <version>5.5.13</version>
            </dependency>
    
    
            <dependency>
                <groupId>commons-io</groupId>
                <artifactId>commons-io</artifactId>
                <version>2.5</version>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
    
                </plugin>
    
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>${java.version}</source>
                        <target>${java.version}</target>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

## 资源配置教程 ##

首先完成资源文件的创建和配置，新建如下文件。  
![在这里插入图片描述][20200326233002231.png]  
`freemarker.ftl`,这里的模板为了后面和多线程版本测试做对比，将PDF设置的比较大，由于数据比较简单。暂时使用数量模拟现实中的质量。说白了就是模拟一段耗时操作。

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8"/>
        <title>Title</title>
        <style> body { font-family: SimHei; } .pos { position: absolute; left: 100px; top: 150px } </style>
    </head>
    <body>
    <div class="blue pos">
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">水调歌头·明月几时有</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">宋代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">苏轼</a></p>
        <div class="contson" id="contson632c5beb84eb">
            <p>丙辰中秋，欢饮达旦，大醉，作此篇，兼怀子由。</p>
            <p>明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。</p>
        </div>
    
        <h1 style="font-size:20px; line-height:22px; height:22px; margin-bottom:10px;">清平乐·别来春半</h1>
        <p class="source"><a href="https://blog.csdn.net/qq_32510597/article/details/105060870">五代</a><span>：</span><a href="https://blog.csdn.net/qq_32510597/article/details/105054876">李煜</a></p>
        <div class="contson" id="contson632c5beb84eb">
            别来春半，触目柔肠断。砌下落梅如雪乱，拂了一身还满。(柔肠断 一作：愁肠断) 雁来音信无凭，路遥归梦难成。离恨恰如春草，更行更远还生。
        </div>
    
    
    </div>
    </body>
    </html>

`application.yml`配置模板路径及生成文件位置

DEST: D:/xxxx/pdfOut/
    HTML: freemarker.ftl
    FONT: simhei.ttf

至此资源配置完成

## 单线程版开发 ##

首先新建`PDFService`类。如下图所示。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 6]  
源码如下：

package com.njust.pdfmutithread.user;
    
    import com.itextpdf.text.Document;
    import com.itextpdf.text.DocumentException;
    import com.itextpdf.text.pdf.PdfWriter;
    import com.itextpdf.tool.xml.XMLWorkerFontProvider;
    import com.itextpdf.tool.xml.XMLWorkerHelper;
    import freemarker.template.Configuration;
    import freemarker.template.Template;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.core.io.ClassPathResource;
    import org.springframework.stereotype.Service;
    
    import java.io.*;
    import java.nio.charset.Charset;
    import java.util.Map;
    
    @Service
    public class PDFService { 
        private String font = "simhei.ttf";
        private static Configuration freemarkerCfg = null;
        @Value("${DEST}")
        private String dest;
    
        @Value("${HTML}")
        private String html;
    
        public String getFont() { 
            return font;
        }
    
        public void setFont(String font) { 
            this.font = font;
        }
    
        public static Configuration getFreemarkerCfg() { 
            return freemarkerCfg;
        }
    
        public static void setFreemarkerCfg(Configuration freemarkerCfg) { 
            PDFService.freemarkerCfg = freemarkerCfg;
        }
    
        public String getDest() { 
            return dest;
        }
    
        public void setDest(String dest) { 
            this.dest = dest;
        }
    
        public String getHtml() { 
            return html;
        }
    
        public void setHtml(String html) { 
            this.html = html;
        }
    
        public void createPdf(String content, String dest) throws IOException, DocumentException { 
            // step 1
            Document document = new Document();
            FileOutputStream fileOutputStream = new FileOutputStream(dest);
            // step 2
            PdfWriter writer = PdfWriter.getInstance(document, fileOutputStream);
            // step 3
            document.open();
            // step 4
            XMLWorkerFontProvider fontImp = new XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS);
            fontImp.register(font);
            XMLWorkerHelper.getInstance().parseXHtml(writer, document,
                    new ByteArrayInputStream(content.getBytes("UTF-8")), null, Charset.forName("UTF-8"), fontImp);
            // step 5
            document.close();
    
        }
    
        /** * freemarker渲染html */
        public String freeMarkerRender(Map<String, Object> data, String htmlTmp) { 
            Writer out = new StringWriter();
    
            try { 
                // 获取模板,并设置编码方式
                setFreemarkerCfg();
                Template template = freemarkerCfg.getTemplate(htmlTmp);
                template.setEncoding("UTF-8");
                //将合并后的数据和模板写入到流中，这里使用的字符流
                template.process(data, out);
                out.flush();
                return out.toString();
            } catch (Exception e) { 
                e.printStackTrace();
            } finally { 
                try { 
                    out.close();
                } catch (IOException ex) { 
                    ex.printStackTrace();
                }
            }
            return null;
        }
    
        /** * 设置freemarkerCfg */
        private void setFreemarkerCfg() { 
            freemarkerCfg = new Configuration();
            //freemarker的模板目录
            try { 
                freemarkerCfg.setDirectoryForTemplateLoading(new ClassPathResource("template").getFile());
            } catch (IOException e) { 
                e.printStackTrace();
            }
        }
    
    
    }

这里的get set方法，主要为了方便测试的时候调用。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 7]  
如上图所示，PDFService 的主要方法是createPdf：创建PDF文件。  
freeMarkerRender：freemarker渲染html。setFreemarkerCfg：设置freemarkerCfg。然后新建一个task任务操作类。如下图所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 8]  
`PDFTaskSingThread`负责流水线创建PDF

package com.njust.pdfmutithread.user.task;
    
    
    import com.itextpdf.text.DocumentException;
    import com.njust.pdfmutithread.user.PDFService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    
    /** * @author Chen * @version 1.0 * @date 2020/3/26 22:09 * @description: */
    @Component
    public class PDFTaskSingThread { 
    
        @Autowired
        private PDFService pdfService;
    
        public void createOne() { 
            //需要填充的数据
            Map<String, Object> data = new HashMap<>(16);
            String content = pdfService.freeMarkerRender(data, pdfService.getHtml());
            String temp = pdfService.getDest() + "a.pdf";
            //创建pdf
            try { 
                pdfService.createPdf(content, temp);
            } catch (IOException e) { 
                e.printStackTrace();
            } catch (DocumentException e) { 
                e.printStackTrace();
            }
    
        }
    
        public void createManyWithOneThread(int num) { 
            //需要填充的数据
            Map<String, Object> data = new HashMap<>(16);
            String content = pdfService.freeMarkerRender(data, pdfService.getHtml());
    
            if (num <= 0) { 
                num = 10;
            }
            String temp = null;
            for (int i = 0; i < num; i++) { 
                temp = pdfService.getDest() + i + ".pdf";
                //创建pdf
                try { 
                    pdfService.createPdf(content, temp);
                } catch (IOException e) { 
                    e.printStackTrace();
                } catch (DocumentException e) { 
                    e.printStackTrace();
                }
            }
    
        }
    }

在PDFService中新建测试类  
![在这里插入图片描述][2020032623495366.png]  
`PDFService`主要根据JOB\_LENGTH大小测试批量生产PDF花费的时间。

package com.njust.pdfmutithread.user;
    
    
    import com.njust.pdfmutithread.user.task.PDFTaskSingThread;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    /** * @author Chen * @version 1.0 * @date 2020/3/26 21:55 * @description: */
    @RunWith(SpringJUnit4ClassRunner.class)
    @SpringBootTest
    public class PDFServiceTest { 
    
        @Autowired
        private PDFTaskSingThread pdfTaskSingThread;
    
    
        public static void printTime(long start, long end) { 
            long spendTime = end - start;
            System.out.println("spendTime: " + spendTime);
        }
    
        @Test
        public void createOne() { 
            long start = System.currentTimeMillis();
            pdfTaskSingThread.createOne();
            long end = System.currentTimeMillis();
            printTime(start, end);
        }
    
        // JOB_LENGTH：260 spendTime: 17310
        // JOB_LENGTH：512 spendTime: 30660
        // JOB_LENGTH：1024 spendTime: 59573
        @Test
        public void createManyWithOneThread() { 
            long start = System.currentTimeMillis();
            pdfTaskSingThread.createManyWithOneThread(JOB_LENGTH);
            long end = System.currentTimeMillis();
            printTime(start, end);
    
        }
    
    
        private final static String JOB_NAME = "生成PDF";
        private final static int JOB_LENGTH = 1024;
    
    }

不同的JOB\_LENGTH花费的时间在作者本人的电脑上运行的时间已经写在了注释里面。读者也可以在自己电脑上运行。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 9]  
对具体流程不是很熟悉的读者可以根据上面的时序图辅助理解。

## 多线程工作框架 ##

按照下图新建类  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 10]  
下面解释一下各个类的作用：

*  ITaskProcesser：要求框架使用者实现的任务接口，因为任务的性质在调用时才知道，所以传入的参数和方法的返回值均使用泛型。
 *  ItemVo：存放到队列的元素
 *  JobInfo：提交给框架执行的工作实体类,工作：表示本批次需要处理的同性质任务(Task)的一个集合。 注意：返回给用户的不能是引用，防止线程安全事故发生。即不允许用户修改底层框架使用的东西。
 *  TaskResult：任务处理返回结果实体类
 *  TaskResultType：方法本身运行是否正确的结果类型
 *  CheckJobProcesser：任务完成后,在一定的时间供查询，之后为释放资源节约内存，需要定期处理过期的任务
 *  PendingJobPool：框架的主体类，也是调用者主要使用的类
 *  SleepTools：线程休眠辅助工具类
 *  PDFTaskMutiThread:多线程版生成PDF

### 源码： ###

`ITaskProcesser`

package com.njust.pdfmutithread.system.vo;
    
    /** * * *类说明：要求框架使用者实现的任务接口，因为任务的性质在调用时才知道， *所以传入的参数和方法的返回值均使用泛型 */
    public interface ITaskProcesser<T, R> { 
    	/** * @param data 调用方法需要使用的业务数据 * @return 方法执行后业务方法的结果 */
    	TaskResult<R> taskExecute(T data);
    }

`ItemVo`

package com.njust.pdfmutithread.system.vo;
    
    import java.util.concurrent.Delayed;
    import java.util.concurrent.TimeUnit;
    
    /** * 类说明：存放到队列的元素 */
    public class ItemVo<T> implements Delayed { 
    
        private long activeTime;//到期时间，单位毫秒
        private T date;
    
        //activeTime是个过期时长
        public ItemVo(long activeTime, T date) { 
            super();
            this.activeTime = TimeUnit.NANOSECONDS.convert(activeTime,
                    TimeUnit.MILLISECONDS) + System.nanoTime();//将传入的时长转换为超时的时刻
            this.date = date;
        }
    
        public long getActiveTime() { 
            return activeTime;
        }
    
        public T getDate() { 
            return date;
        }
    
        //按照剩余时间排序
        @Override
        public int compareTo(Delayed o) { 
            long d = getDelay(TimeUnit.NANOSECONDS) - o.getDelay(TimeUnit.NANOSECONDS);
            return (d == 0) ? 0 : ((d > 0) ? 1 : -1);
        }
    
        //返回元素的剩余时间
        @Override
        public long getDelay(TimeUnit unit) { 
            long d = unit.convert(this.activeTime - System.nanoTime(),
                    TimeUnit.NANOSECONDS);
            return d;
        }
    
    
    }

`JobInfo`

package com.njust.pdfmutithread.system.vo;
    
    
    import com.njust.pdfmutithread.system.CheckJobProcesser;
    
    import java.util.LinkedList;
    import java.util.List;
    import java.util.concurrent.LinkedBlockingDeque;
    import java.util.concurrent.atomic.AtomicInteger;
    
    /** * 类说明：提交给框架执行的工作实体类,工作：表示本批次需要处理的同性质任务(Task)的一个集合 * 注意：返回给用户的不能是引用，防止线程安全事故发生。即不允许用户修改底层框架使用的东西 */
    public class JobInfo<R> { 
        //区分唯一的工作
        private final String jobName;
        //工作的任务个数
        private final int jobLength;
        //这个工作的任务处理器
        private final ITaskProcesser<?, ?> taskProcesser;
        //成功处理的任务数
        private final AtomicInteger successCount;
        //已处理的任务数
        private final AtomicInteger taskProcesserCount;
        //拿结果从头拿，放结果从尾部放 保存工作中每个任务的返回结果,只有处理完成成放进去
        private final LinkedBlockingDeque<TaskResult<R>> taskDetailQueue;
        //工作的完成保存的时间，超过这个时间从缓存中清除
        private final long expireTime;
    
        //阻塞队列不应该由调用者传入，应该内部生成，长度为工作的任务个数
        public JobInfo(String jobName, int jobLength,
                       ITaskProcesser<?, ?> taskProcesser,
                       long expireTime) { 
            super();
            this.jobName = jobName;
            this.jobLength = jobLength;
            this.taskProcesser = taskProcesser;
            this.successCount = new AtomicInteger(0);
            this.taskProcesserCount = new AtomicInteger(0);
            this.taskDetailQueue = new LinkedBlockingDeque<>(jobLength);
            this.expireTime = expireTime;
        }
    
        //返回成功处理的结果数
        //不能直接返回 successCount 因为这是一个引用，会导致线程不安全，以下同理
        public int getSuccessCount() { 
            return successCount.get();
        }
    
        //返回当前已处理的结果数
        public int getTaskProcesserCount() { 
            return taskProcesserCount.get();
        }
    
        //提供工作中失败的次数，为了方便调用者使用
        public int getFailCount() { 
            return taskProcesserCount.get() - successCount.get();
        }
    
        //获得工作中每个任务的处理详情
        //注意由于阻塞队列是加锁的，所以不存在写的时候读，多线程冲突
        public List<TaskResult<R>> getTaskDetail() { 
            List<TaskResult<R>> taskList = new LinkedList<>();
            TaskResult<R> taskResult;
            //从阻塞队列中拿任务的结果，反复取，一直取到null为止，说明目前队列中最新的任务结果已经取完，可以不取了
            //既然是任务结果，肯定已经处理完成了，所以全部拿完是对的
            while ((taskResult = taskDetailQueue.pollFirst()) != null) { 
                taskList.add(taskResult);
            }
            return taskList;
        }
    
        //从业务应用角度来说，保证最终一致性即可，不需要对方法加锁.
        //注意 从jvm内存角度，只有传递进来的参数需要操作的时候才需要新建一个变量接受，即栈变量
        public void addTaskResult(TaskResult<R> result, CheckJobProcesser checkJob) { 
            if (TaskResultType.Success.equals(result.getResultType())) { 
                successCount.incrementAndGet();
            }
            taskDetailQueue.addLast(result);
            taskProcesserCount.incrementAndGet();
    
            //工作队列满了，放入过期队列
            if (taskProcesserCount.get() == jobLength) { 
                checkJob.putJob(jobName, expireTime);
            }
    
    // if (taskProcesserCount.get() >= jobLength) { 
    // if (result.getReturnValue() == null) { 
    // System.out.println("chen: " + taskProcesserCount.get());
    // } else { 
    // System.out.println("chen: " + taskProcesserCount.get() + " : " + result.getReturnValue());
    // }
    //
    // }
        }
    
        public String getTotalProcess() { 
            return "Success[" + successCount.get() + "]/Current["
                    + taskProcesserCount.get() + "] Total[" + jobLength + "]";
        }
    
        public ITaskProcesser<?, ?> getTaskProcesser() { 
            return taskProcesser;
        }
    
    
    }

`TaskResult`

package com.njust.pdfmutithread.system.vo;
    
    /** * *类说明：任务处理返回结果实体类 */
    public class TaskResult<R> { 
    	//方法本身运行是否正确的结果类型
    	private final TaskResultType resultType;
    	//方法的业务结果数据；
    	private final R returnValue;
    	//这里放方法失败的原因
    	private final String reason;
    	
    	public TaskResult(TaskResultType resultType, R returnValue, String reason) { 
    		super();
    		this.resultType = resultType;
    		this.returnValue = returnValue;
    		this.reason = reason;
    	}
    	
    	//方便业务人员使用，这个构造方法表示业务方法执行成功返回的结果
    	public TaskResult(TaskResultType resultType, R returnValue) { 
    		super();
    		this.resultType = resultType;
    		this.returnValue = returnValue;
    		this.reason = "Success";
    	}
    
    	public TaskResultType getResultType() { 
    		return resultType;
    	}
    
    	public R getReturnValue() { 
    		return returnValue;
    	}
    
    	public String getReason() { 
    		return reason;
    	}
    
    
    	@Override
    	public String toString() { 
    		return "TaskResult{" +
    				"resultType=" + resultType +
    				", returnValue=" + returnValue +
    				", reason='" + reason + '\'' +
    				'}';
    	}
    }

`TaskResultType`

package com.njust.pdfmutithread.system.vo;
    
    /** * 类说明：方法本身运行是否正确的结果类型 */
    public enum TaskResultType { 
        //方法成功执行并返回了业务人员需要的结果
        Success,
        //方法成功执行但是返回的是业务人员不需要的结果
        Failure,
        //方法执行抛出了Exception
        Exception;
    
    
    }

`CheckJobProcesser`

package com.njust.pdfmutithread.system;
    
    
    import com.njust.pdfmutithread.system.vo.ItemVo;
    
    import java.util.concurrent.DelayQueue;
    
    /** * 类说明：任务完成后,在一定的时间供查询，之后为释放资源节约内存，需要定期处理过期的任务 */
    public class CheckJobProcesser { 
        //DelayQueue是一个无界阻塞队列，只有在延迟期满时才能从中提取元素
        private static DelayQueue<ItemVo<String>> queue
                = new DelayQueue<>();//存放已完成任务等待过期的队列
    
        //单例模式------
        private CheckJobProcesser() { 
        }
    
        private static class ProcesserHolder { 
            public static CheckJobProcesser processer = new CheckJobProcesser();
        }
    
        public static CheckJobProcesser getInstance() { 
            return ProcesserHolder.processer;
        }
        //单例模式------
    
        //处理队列中到期任务的实行
        private static class FetchJob implements Runnable { 
    
            @Override
            public void run() { 
                while (true) { 
                    try { 
                        //拿到已经过期的任务 take()是阻塞方法
                        ItemVo<String> item = queue.take();
                        String jobName = item.getDate();
                        PendingJobPool.getMap().remove(jobName);
                        System.out.println(jobName + " is out of date,remove from map!");
                    } catch (InterruptedException e) { 
                        e.printStackTrace();
                    }
                }
            }
        }
    
        /*任务完成后，放入队列，经过expireTime时间后，从整个框架中移除*/
        public void putJob(String jobName, long expireTime) { 
            //实现名称和到期时间绑定
            ItemVo<String> item = new ItemVo<String>(expireTime, jobName);
            queue.offer(item);
            System.out.println("Job[" + jobName + "已经放入了过期检查缓存，过期时长：" + expireTime);
        }
    
        static { 
            Thread thread = new Thread(new FetchJob());
            thread.setDaemon(true);
            thread.start();
            System.out.println("开启任务过期检查守护线程................");
        }
    
    
    }

`PendingJobPool`

package com.njust.pdfmutithread.system;
    
    
    import com.njust.pdfmutithread.system.vo.ITaskProcesser;
    import com.njust.pdfmutithread.system.vo.JobInfo;
    import com.njust.pdfmutithread.system.vo.TaskResult;
    import com.njust.pdfmutithread.system.vo.TaskResultType;
    
    import java.util.List;
    import java.util.Map;
    import java.util.concurrent.*;
    
    /** * 框架的主体类，也是调用者主要使用的类 */
    public class PendingJobPool { 
    
        //保守估计
        private static final int THREAD_COUNTS =
                Runtime.getRuntime().availableProcessors();
        //任务队列 注意： 框架尽量避免使用无界队列 防止用户无限制上传
        private static BlockingQueue<Runnable> taskQueue
                = new ArrayBlockingQueue<>(5000);
        //线程池，固定大小，有界队列
        private static ExecutorService taskExecutor =
                new ThreadPoolExecutor(THREAD_COUNTS, THREAD_COUNTS, 60,
                        TimeUnit.SECONDS, taskQueue);
        //job的存放容器
        //G<?> 与 G<? extends Object>等同，如List<?> 与List<? extends Objext>等同。
        private static ConcurrentHashMap<String, JobInfo<?>> jobInfoMap
                = new ConcurrentHashMap<>();
    
        private static CheckJobProcesser checkJob
                = CheckJobProcesser.getInstance();
    
        public static Map<String, JobInfo<?>> getMap() { 
            return jobInfoMap;
        }
    
        //单例模式------注意：限制用户使用的线程数，防止应用崩掉
        private PendingJobPool() { 
        }
    
        //懒加载式的线程安全
        private static class JobPoolHolder { 
            public static PendingJobPool pool = new PendingJobPool();
        }
    
        public static PendingJobPool getInstance() { 
            return JobPoolHolder.pool;
        }
        //单例模式------
    
        //对工作中的任务进行包装，提交给线程池使用，并处理任务的结果，写入缓存以供查询
        private static class PendingTask<T, R> implements Runnable { 
    
            private JobInfo<R> jobInfo;
            private T processData;
    
            public PendingTask(JobInfo<R> jobInfo, T processData) { 
                super();
                this.jobInfo = jobInfo;
                this.processData = processData;
            }
    
            //告诉编译器忽略指定的警告，不用在编译完成后出现警告信息。
            @SuppressWarnings("unchecked")
            @Override
            public void run() { 
                R r = null;
                ITaskProcesser<T, R> taskProcesser =
                        (ITaskProcesser<T, R>) jobInfo.getTaskProcesser();
                TaskResult<R> result = null;
    
                //用户的代码是最不可信的，所以防止用户程序抛出异常，需要try catch处理
                try { 
                    //调用业务人员实现的具体方法
                    result = taskProcesser.taskExecute(processData);
                    //要做检查，防止开发人员处理不当
                    if (result == null) { 
                        result = new TaskResult<R>(TaskResultType.Exception, r,
                                "result is null");
                    }
                    if (result.getResultType() == null) { 
                        if (result.getReason() == null) { 
                            result = new TaskResult<R>(TaskResultType.Exception, r, "reason is null");
                        } else { 
                            result = new TaskResult<R>(TaskResultType.Exception, r,
                                    "result is null,but reason:" + result.getReason());
                        }
                    }
                } catch (Exception e) { 
    // e.printStackTrace();
                    result = new TaskResult<R>(TaskResultType.Exception, r,
                            e.getMessage());
                } finally { 
                    jobInfo.addTaskResult(result, checkJob);
                }
            }
        }
    
        //根据工作名称检索工作
        @SuppressWarnings("unchecked")
        private <R> JobInfo<R> getJob(String jobName) { 
            JobInfo<R> jobInfo = (JobInfo<R>) jobInfoMap.get(jobName);
            if (null == jobInfo) { 
                throw new RuntimeException(jobName + "是个非法任务、或该任务已经过期！");
            }
            return jobInfo;
        }
    
        //调用者提交工作中的任务
        public <T, R> void putTask(String jobName, T t) { 
            JobInfo<R> jobInfo = getJob(jobName);
            PendingTask<T, R> task = new PendingTask<>(jobInfo, t);
            taskExecutor.execute(task);
        }
    
        //调用者注册工作，如工作名，任务的处理器等等,名称唯一，相当于ID
        public <R> void registerJob(String jobName, int jobLength,
                                    ITaskProcesser<?, ?> taskProcesser, long expireTime) { 
            JobInfo<R> jobInfo = new JobInfo<>(jobName, jobLength, taskProcesser, expireTime);
            // 不能使用put,防止任务在处理的时候，用户修改map,导致处理异常
            if (jobInfoMap.putIfAbsent(jobName, jobInfo) != null) { 
                throw new RuntimeException(jobName + "已经注册了！");
            }
        }
    
        //获得每个任务的处理详情
        public <R> List<TaskResult<R>> getTaskDetail(String jobName) { 
            JobInfo<R> jobInfo = getJob(jobName);
            return jobInfo.getTaskDetail();
        }
    
        //获得工作的整体处理进度
        public <R> String getTaskProgess(String jobName) { 
            JobInfo<R> jobInfo = getJob(jobName);
            return jobInfo.getTotalProcess();
        }
    
    }

`PDFTaskMutiThread`

package com.njust.pdfmutithread.user.task;
    
    
    import com.itextpdf.text.DocumentException;
    import com.njust.pdfmutithread.system.vo.ITaskProcesser;
    import com.njust.pdfmutithread.system.vo.TaskResult;
    import com.njust.pdfmutithread.system.vo.TaskResultType;
    import com.njust.pdfmutithread.user.PDFService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    
    /** * @author Chen * @version 1.0 * @date 2020/3/26 22:06 * @description: 多线程版生成PDF */
    @Component
    public class PDFTaskMutiThread implements ITaskProcesser<String, Integer> { 
    
        @Autowired
        private PDFService pdfService;
    
        @Override
        public TaskResult<Integer> taskExecute(String data) { 
            createOne(data + ".pdf");
            return new TaskResult<>(TaskResultType.Success, Integer.valueOf(data));
        }
    
        public void createOne(String fileName) { 
            //需要填充的数据
            Map<String, Object> data = new HashMap<>(16);
            String content = pdfService.freeMarkerRender(data, pdfService.getHtml());
            // 当content 为null时 ，不停尝试
            while (content == null) { 
                content = pdfService.freeMarkerRender(data, pdfService.getHtml());
            }
            String temp = pdfService.getDest() + fileName;
            //创建pdf
            try { 
                pdfService.createPdf(content, temp);
            } catch (IOException e) { 
                e.printStackTrace();
            } catch (DocumentException e) { 
                e.printStackTrace();
            }
    
        }
    }

修改`PDFServiceTest`类，添加多线程版的测试方法。完整代码如下：

package com.njust.pdfmutithread.user;
    
    
    import com.njust.pdfmutithread.system.PendingJobPool;
    import com.njust.pdfmutithread.system.vo.TaskResult;
    import com.njust.pdfmutithread.user.task.PDFTaskMutiThread;
    import com.njust.pdfmutithread.user.task.PDFTaskSingThread;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    import java.util.List;
    
    /** * @author Chen * @version 1.0 * @date 2020/3/26 21:55 * @description: */
    @RunWith(SpringJUnit4ClassRunner.class)
    @SpringBootTest
    public class PDFServiceTest { 
    
        @Autowired
        private PDFTaskSingThread pdfTaskSingThread;
    
    
        public static void printTime(long start, long end) { 
            long spendTime = end - start;
            System.out.println("spendTime: " + spendTime);
        }
    
        @Test
        public void createOne() { 
            long start = System.currentTimeMillis();
            pdfTaskSingThread.createOne();
            long end = System.currentTimeMillis();
            printTime(start, end);
        }
    
        // JOB_LENGTH：260 spendTime: 17310
        // JOB_LENGTH：512 spendTime: 30660
        // JOB_LENGTH：1024 spendTime: 59573
        @Test
        public void createManyWithOneThread() { 
            long start = System.currentTimeMillis();
            pdfTaskSingThread.createManyWithOneThread(JOB_LENGTH);
            long end = System.currentTimeMillis();
            printTime(start, end);
    
        }
    
    
        private final static String JOB_NAME = "生成PDF";
        private final static int JOB_LENGTH = 1024;
    
        @Autowired
        private PDFTaskMutiThread pdfTaskMutiThread;
    
        //查询任务进度的线程
        private static class QueryResult implements Runnable { 
    
            private PendingJobPool pool;
    
            public QueryResult(PendingJobPool pool) { 
                super();
                this.pool = pool;
            }
    
            @Override
            public void run() { 
                int num = 0;
                List<TaskResult<String>> taskDetail;
                try { 
                    while (num < JOB_LENGTH) { 
                        taskDetail = pool.getTaskDetail(JOB_NAME);
                        if (!taskDetail.isEmpty()) { 
                            num += taskDetail.size();
                        }
                    }
                } catch (Exception e) { 
    
                }
                end_chen = System.currentTimeMillis();
                PDFServiceTest.printTime(start_chen, end_chen);
            }
    
        }
    
    
        private static long start_chen;
        private static long end_chen;
    
        // JOB_LENGTH：260 spendTime: 17599
        // JOB_LENGTH：512 spendTime: 33531
        // JOB_LENGTH：1024 spendTime: 56144
        @Test
        public void testPDFTaskMutiThread() throws InterruptedException { 
            start_chen = System.currentTimeMillis();
            //拿到框架的实例
            PendingJobPool pool = PendingJobPool.getInstance();
            //注册job
            pool.registerJob(JOB_NAME, JOB_LENGTH, pdfTaskMutiThread, 1000 * 50);
            // 假定用户不按套路出牌
            for (int i = 0; i < JOB_LENGTH; i++) { 
                //依次推入Task
                pool.putTask(JOB_NAME, String.valueOf(i));
            }
            Thread t = new Thread(new QueryResult(pool));
            t.start();
            t.join();
        }
    
    }

可以发现当生成的PDF较多时，多线程占优势。但是苦逼的我电脑配置实在是太差了。能跑出这个效果已经谢天谢帝了。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNTEwNTk3_size_16_color_FFFFFF_t_70 11]  
多线程版的时序图，如上图所示。

## 问题 ##

多线程生成PDF会报异常，但是工作框架具有完美的异常处理能力。即使有异常，但是依然可以正确生成PDF。但是为什么出现异常还没有搞明白。等我搞明白了，再更新一下。睡觉了。。。各位小伙伴晚安！！！

## 总结 ##

多线程在IO密集型任务明显占有优势。但是实现起来真的烧脑啊。各位读者有什么问题，欢迎评论交流！

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