Spring-Boot 使用log4j2日志

我会带着你远行 2021-11-26 18:44 337阅读 0赞

Spring-Boot 本身自带有日志组件，但具有很大的局限性，通常我们会使用log4j2

###### Spring-Boot 自带的日志组件的配置方法 ######

logging:
      level: debug
      path: D:/logs/
      file: logs/test.log

## 如何Spring-Boot 使用log4j2日志 ##

可以看到spring-boot-starter是依赖自带的日志组件的；  
![在这里插入图片描述][20190723035147114.png]  
1、在`pom.xml`中屏蔽自带的日志组件；

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                
                <exclusions>
                    <exclusion>
                        <artifactId>spring-boot-starter-logging</artifactId>
                        <groupId>org.springframework.boot</groupId>
                    </exclusion>
                </exclusions>
            </dependency>

exclusions标签用于排除一些依赖；  
可以看到，此时依赖关系已经被移出了；  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NhbHRzb3Vs_size_16_color_FFFFFF_t_70]

2、在`pom.xml`中添加log4j2

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-log4j</artifactId>
                <version>1.3.2.RELEASE</version>
            </dependency>

3、在resources文件夹添加`log4j2.xml`配置文件；

到这一步，spring-boot的log4j2就配置好了，新建一个handler测试一下；

import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    @Controller
    @RequestMapping("/test")
    public class TestHandler { 
        private Logger logger=  LoggerFactory.getLogger(TestHandler.class);
        @RequestMapping("qwq")
        @ResponseBody
        public String test(){ 
            logger.debug("-------debug-------");
            logger.info("-------info-------");
            logger.error("------error--------");
            return "good idea";
        }

访问url使控制台输出：  
![在这里插入图片描述][2019072304144076.png]  
同时创建了日志文件：  
![在这里插入图片描述][20190723041513207.png]

--------------------

#### 其他：log4j2.xml配置文件 ####

<?xml version="1.0" encoding="UTF-8"?>
    <configuration>
    	<appenders>
    		
    		<console name="Console" target="SYSTEM_OUT">
    			<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %class %L %M -- %msg%n" />
    		</console>
    
    		
    		<RollingFile name="RollingFileDebug" fileName="D:/logs/debug.log" filePattern="D:/logs/$${date:yyyy-MM-dd}/debug-%d{yyyy-MM-dd}-%i.log">
    			<Filters>
    				<ThresholdFilter level="DEBUG" />
    				<ThresholdFilter level="INFO" onMatch="DENY" onMismatch="NEUTRAL" />
    			</Filters>
    			
    			<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %class{36} %L %M - %msg%n" />
    			<Policies>
    				
    				<SizeBasedTriggeringPolicy size="100 MB" />
    			</Policies>
    			
    			<DefaultRolloverStrategy max="20" />
    		</RollingFile>
    
    		<RollingFile name="RollingFileInfo" fileName="D:/logs/info.log" filePattern="D:/logs/$${date:yyyy-MM-dd}/info-%d{yyyy-MM-dd}-%i.log">
    			<Filters>
    				<ThresholdFilter level="INFO" />
    				<ThresholdFilter level="WARN" onMatch="DENY" onMismatch="NEUTRAL" />
    			</Filters>
    			
    			<PatternLayout pattern="%d{HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n" />
    			<Policies>
    				
    				<SizeBasedTriggeringPolicy size="100 MB" />
    			</Policies>
    			
    			<DefaultRolloverStrategy max="20" />
    		</RollingFile>
    
    		<RollingFile name="RollingFileWarn" fileName="D:/logs/warn.log" filePattern="D:/logs/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log">
    			<Filters>
    				<ThresholdFilter level="WARN" />
    				<ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL" />
    			</Filters>
    			<PatternLayout pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n" />
    			<Policies>
    				
    				<SizeBasedTriggeringPolicy size="100 MB" />
    			</Policies>
    			
    			<DefaultRolloverStrategy max="20" min="1" />
    		</RollingFile>
    
    		<RollingFile name="RollingFileError" fileName="D:/logs/error.log" filePattern="D:/logs/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log">
    			<Filters>
    				<ThresholdFilter level="ERROR" />
    				<ThresholdFilter level="FATAL" onMatch="DENY" onMismatch="NEUTRAL" />
    			</Filters>
    			<PatternLayout pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n" />
    			<Policies>
    				
    				<SizeBasedTriggeringPolicy size="100 MB" />
    			</Policies>
    			
    			<DefaultRolloverStrategy max="20" min="1" />
    		</RollingFile>
    	</appenders>
    
    	<loggers>
    		 <logger name="org.springframework" level="error" includeLocation="true"></logger>
            <logger name="org.mybatis" level="error" includeLocation="true"></logger>
            <logger name="org.apache.ibatis" level="error" includeLocation="true"></logger>
            
            <root level="debug">
                <appender-ref ref="Console"/>
                <appender-ref ref="RollingFileDebug"/>
                <appender-ref ref="RollingFileInfo"/>
                <appender-ref ref="RollingFileWarn"/>
                <appender-ref ref="RollingFileError"/>
            </root>
     
    	</loggers>
    </configuration>

[20190723035147114.png]: /images/20211126/be0bb74ac20a4d1988c3f90db404d0b1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NhbHRzb3Vs_size_16_color_FFFFFF_t_70]: /images/20211126/0e8ad07c42aa48d3966e4651b0a367cb.png
[2019072304144076.png]: /images/20211126/32a37fcf8ed144d9bf2410e1fd72404e.png
[20190723041513207.png]: /images/20211126/a7bc5effdef3410d9ff867d35b28532e.png