SpringBoot2.1.X 日志集成

客官°小女子只卖身不卖艺 2024-04-19 11:15 62阅读 0赞

#### 一、 日志介绍 ####

1、常用处理java的日志组件 slf4j,log4j,logback,common-logging 等  
  
2、logback介绍：基于Log4j基础上大量改良，不能单独使用，推荐配合日志框架SLF4J来使用  
logback当前分成三个模块：logback-core,logback-classic和logback-access;  
logback-core是其它两个模块的基础模块

3、Logback的核心对象：  
Logger：日志记录器  
Appender：指定日志输出的目的地，目的地可以是控制台，文件  
Layout：日志布局 格式化日志信息的输出

4、日志级别：DEBUG < INFO < WARN < ERROR

5、Log4j日志转换为logback在线工具（支持log4j.properties转换为logback.xml,不支持 log4j.xml转换为logback.xml）  
https://logback.qos.ch/translator/

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 1][]

#### **二、实战操作** ####

使用starters启动器，Spring Boot将使用Logback作为默认日志框架;

**spring-boot-starter启动器包含spring-boot-starter-logging启动器并集成了slf4j日志抽象及Logback日志框架。**

1、官网介绍：https://docs.spring.io/spring-boot/docs/2.1.8.BUILD-SNAPSHOT/reference/htmlsingle/\#boot-features-logging

各个组件案例：https://logback.qos.ch/manual/index.html

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 2][]  
  
2、分析SpringBoot启动日志  
1）默认情况下，Spring Boot将日志输出到控制台

3、整合Logback实战  
1）创建 日志文件logback-spring.xml，官方推荐 -spring.xml结尾  
默认加载加载配置顺序 logback-spring.xml, logback-spring.groovy, logback.xml, or logback.groovy

![20190917174227397.png][]

在resources目录下创建logback-spring.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
    <configuration>
    
        <appender name="consoleApp" class="ch.qos.logback.core.ConsoleAppender">
            <layout class="ch.qos.logback.classic.PatternLayout">
                <pattern>
                    %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
                </pattern>
            </layout>
        </appender>
    
        <appender name="fileInfoApp" class="ch.qos.logback.core.rolling.RollingFileAppender">
            <filter class="ch.qos.logback.classic.filter.LevelFilter">
                <level>ERROR</level>
                <onMatch>DENY</onMatch>
                <onMismatch>ACCEPT</onMismatch>
            </filter>
            <encoder>
                <pattern>
                    %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
                </pattern>
            </encoder>
            
            <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                
                <fileNamePattern>app_log/log/app.info.%d.log</fileNamePattern>
            </rollingPolicy>
        </appender>
    
        <appender name="fileErrorApp" class="ch.qos.logback.core.rolling.RollingFileAppender">
            <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
                <level>ERROR</level>
            </filter>
            <encoder>
                <pattern>
                    %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
                </pattern>
            </encoder>
    
            
            <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                
                <fileNamePattern>app_log/log/app.err.%d.log</fileNamePattern>
    
                
                <MaxHistory>1</MaxHistory>
    
            </rollingPolicy>
        </appender>
        
        <root level="INFO">
            <appender-ref ref="consoleApp"/>
            <appender-ref ref="fileInfoApp"/>
            <appender-ref ref="fileErrorApp"/>
        </root>
    </configuration>

控制器类

import net.hlx.myspringboot.redis_demo.entity.JsonData;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/log/my")
    public class LogController {
    
        //日志对象
       private Logger  logger= LoggerFactory.getLogger(this.getClass());
    
        @GetMapping("test")
        public Object test(){
            logger.debug("this is debug!");
            logger.info("this is info!");
            logger.warn("this is warn!");
            logger.error("this is error!");
    
            return JsonData.buildSuccess();
        }
    
    }

工程结构图: **启动后 <fileNamePattern>app\_log/log/app.info.%d.log</fileNamePattern>**  
![20190917174518730.png][]

启动：

![20190917174637239.png][]

分别打开日志文件：

![20190917174708397.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 3][]

**可以修改logback-spring.xml文件，但一般不用Debug哦！要么使用INFO，WARN哦！**

![20190917174908806.png][]

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[20190917174227397.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/6efe70faf60d4661ba62e3a7dbb7ba80.png
[20190917174518730.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/e2d77bfd6b5e4ee2bb1bdc6400e791df.png
[20190917174637239.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/5969449cb63d47138b86f96d2b9b347d.png
[20190917174708397.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/465099a2a88e4ca8956ee924c6dc7730.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 3]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/acda99aee24d40deaa380a032b7bc984.png
[20190917174908806.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/65e2d0dbb04e4cc8820d5b4179376f36.png