Maven构建可执行的jar包(包含依赖jar包)之maven-assembly-plugin介绍

灰太狼 2022-05-16 10:04 770阅读 0赞

*  **1， 简介**

先看官方文档：[http://maven.apache.org/plugins/maven-assembly-plugin/index.html][http_maven.apache.org_plugins_maven-assembly-plugin_index.html] maven-assembly-plugin可以将依赖的第三方jar包打包到jar中，这样方便我们发布可执行的jar包。

*  **2， 用法**

用法部分的官方文档：[http://maven.apache.org/plugins/maven-assembly-plugin/index.html][http_maven.apache.org_plugins_maven-assembly-plugin_index.html]

<plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>3.1.0</version>
            <configuration>
              <descriptorRefs>
                <descriptorRef>jar-with-dependencies</descriptorRef>
              </descriptorRefs>
            </configuration>
            <executions>
              <execution>
                <id>make-assembly</id> 
                <phase>package</phase> 
                <goals>
                  <goal>single</goal>
                </goals>
              </execution>
            </executions>
          </plugin>

*  **3，具体示例**

具体工程代码在[这里][Link 1]。欢迎fork加星，谢谢！  
我的pom文件如下

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.yq</groupId>
        <artifactId>MavenPluginDemo</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.0.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.1.33</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>3.5</version>
            </dependency>
    
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
                <version>2.7.0</version>
            </dependency>
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger-ui</artifactId>
                <version>2.7.0</version>
            </dependency>
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-spring-web</artifactId>
                <version>2.7.0</version>
            </dependency>
        </dependencies>
    
    
        <repositories>
            <repository>
                <id>spring-milestones</id>
                <name>Spring Milestones</name>
                <url>https://repo.spring.io/milestone</url>
                <snapshots>
                    <enabled>false</enabled>
                </snapshots>
            </repository>
        </repositories>
    
        <build>
            <plugins>
                
                    
                    
                    
                    
                        
                            
                                
                                
                                
                            
                        
                    
                
                <plugin>
                    <artifactId>maven-assembly-plugin</artifactId>
                    <version>3.1.0</version>
                    <configuration>
                        <descriptorRefs>
                            <descriptorRef>jar-with-dependencies</descriptorRef>
                        </descriptorRefs>
                    </configuration>
                    <executions>
                        <execution>
                            <id>make-assembly</id> 
                            <phase>package</phase> 
                            <goals>
                                <goal>single</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
                
                    
                    
                
            </plugins>
        </build>
    
    </project>

执行mvn package

D:\E\workspaceGitub\springboot\MavenPluginDemo>mvn package
    [INFO] Scanning for projects...
    [INFO]
    [INFO] -----------------------< com.yq:MavenPluginDemo >-----------------------
    [INFO] Building MavenPluginDemo 1.0-SNAPSHOT
    [INFO] --------------------------------[ jar ]---------------------------------
    [INFO]
    [INFO] --- maven-resources-plugin:3.0.1:resources (default-resources) @ MavenPluginDemo ---
    [INFO] Using 'UTF-8' encoding to copy filtered resources.
    [INFO] Copying 0 resource
    [INFO] Copying 0 resource
    [INFO]
    [INFO] --- maven-compiler-plugin:3.7.0:compile (default-compile) @ MavenPluginDemo ---
    [INFO] Changes detected - recompiling the module!
    [INFO] Compiling 4 source files to D:\E\workspaceGitub\springboot\MavenPluginDemo\target\classes
    [INFO]
    [INFO] --- maven-resources-plugin:3.0.1:testResources (default-testResources) @ MavenPluginDemo ---
    [INFO] Using 'UTF-8' encoding to copy filtered resources.
    [INFO] skip non existing resourceDirectory D:\E\workspaceGitub\springboot\MavenPluginDemo\src\test\resources
    [INFO]
    [INFO] --- maven-compiler-plugin:3.7.0:testCompile (default-testCompile) @ MavenPluginDemo ---
    [INFO] Nothing to compile - all classes are up to date
    [INFO]
    [INFO] --- maven-surefire-plugin:2.20.1:test (default-test) @ MavenPluginDemo ---
    [INFO] No tests to run.
    [INFO]
    [INFO] --- maven-jar-plugin:3.0.2:jar (default-jar) @ MavenPluginDemo ---
    [INFO] Building jar: D:\E\workspaceGitub\springboot\MavenPluginDemo\target\MavenPluginDemo-1.0-SNAPSHOT.jar
    [INFO]
    [INFO] --- maven-assembly-plugin:3.1.0:single (make-assembly) @ MavenPluginDemo ---
    [INFO] Building jar: D:\E\workspaceGitub\springboot\MavenPluginDemo\target\MavenPluginDemo-1.0-SNAPSHOT-jar-with-dependencies.jar
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD SUCCESS
    [INFO] ------------------------------------------------------------------------
    [INFO] Total time: 13.613 s
    [INFO] Finished at: 2018-08-19T19:45:56+08:00
    [INFO] ------------------------------------------------------------------------
    
    D:\E\workspaceGitub\springboot\MavenPluginDemo>

![这里写图片描述][70]  
此时执行>java -jar MavenPluginDemo-1.0-SNAPSHOT-jar-with-dependencies.jar  
会报错误：MavenPluginDemo-1.0-SNAPSHOT-jar-with-dependencies.jar中没有主清单属性

修改pom文件中maven-assembly-plugin的设置

<plugin>
                    <artifactId>maven-assembly-plugin</artifactId>
                    <version>3.1.0</version>
                    <configuration>
                        <archive>
                            <manifest>
                                <addClasspath>true</addClasspath>
                                <classpathPrefix>lib/</classpathPrefix>
                                <mainClass>com.yq.WebUserApplication</mainClass>
                            </manifest>
                        </archive>
                        <descriptorRefs>
                            <descriptorRef>jar-with-dependencies</descriptorRef>
                        </descriptorRefs>
                    </configuration>
                    <executions>
                        <execution>
                            <id>make-assembly</id> 
                            <phase>package</phase> 
                            <goals>
                                <goal>single</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>

**注意：** \*\*

## 非常重要。 ##

\*\*  
本文示例代码是个spring boot工程，因此一般使用spring-boot-maven-plugin最适合。

<plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>

关于spring-boot-maven-plugin请参考https://docs.spring.io/spring-boot/docs/current/reference/html/build-tool-plugins-maven-plugin.html

本文使用了maven-assembly-plugin，生成的jar启动时报如下错误。导致项目无法正常运行（这是因为我们的项目是springboot的项目，如果是普通的以main函数所在类启动的，不涉及springboot特有东西的不会出现如下错误）  
Caused by: java.lang.IllegalArgumentException: No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.  
at org.springframework.util.Assert.notEmpty(Assert.java:450) ~\[MavenPluginDemo-1.0-SNAPSHOT-jar-with-dependencies.jar:na\]

[http_maven.apache.org_plugins_maven-assembly-plugin_index.html]: http://maven.apache.org/plugins/maven-assembly-plugin/index.html
[Link 1]: https://github.com/yqbjtu/springboot/tree/master/MavenPluginDemo
[70]: /images/20220516/9d2677f41b084c258ef11f382fa7b082.png