logback日志的使用

迷南。 2023-07-11 12:50 22阅读 0赞

#### logback的作用 ####

使程序能把日志打印到控制台（其中mybatis执行的sql语句也会打印）和文件中，并且不同级别的日志分别打印到相应的日志文件中

### **catalina.home**和**catalina.base**区别 ###

[catalina.home和catalina.base][catalina.home_catalina.base]

[Tomcat解惑 之 CATALINA\_HOME与CATALINA\_BASE][Tomcat_ _ CATALINA_HOME_CATALINA_BASE]

catalina.home指向公用信息的位置，就是bin和lib的父目 录。  
catalina.**base**指 向每个**Tomcat**目 录私有信息的位置，就是conf、logs、temp、webapps和work的父目录。

### 导入依赖 ###

如果是SSM项目，那么需要导入logback的依赖，如果是SpringBoot则不需要，因为SpringBoot默认加入了logback的依赖

<dependency>
    	<groupId>ch.qos.logback</groupId>
    	<artifactId>logback-classic</artifactId>
    	<version>1.2.3</version>
    </dependency>
    
    <dependency>
        <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
         <version>1.7.25</version>
    </dependency>
    <dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <version>1.18.0</version>
    </dependency>

### logback.xml文件的配置 ###

直接把下面的文件命名为logback.xml放在java/resource下（根目录）就可以被自动读取

<?xml version="1.0" encoding="UTF-8"?>
    
    <configuration scan="true" scanPeriod="60 seconds" debug="false">
    	
    	
    	
    	<property name="log.level" value="debug" />
    	
    	<property name="log.maxHistory" value="30" />
    	
    	<property name="log.filePath" value="${catalina.base}/logs/webapps" />
    	
    	<property name="log.pattern" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n"/>
    	
        
    	
    	<appender name="consoleAppender" class="ch.qos.logback.core.ConsoleAppender">
    		
    		<encoder>
                
    			<pattern>${log.pattern}</pattern>
    		</encoder>
    	</appender>
        
    	
        
    	<appender name="debugAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
    		<file>${log.filePath}/debug.log</file>
            
    		<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
    			
    			<fileNamePattern>${log.filePath}/debug/debug.%d{yyyy-MM-dd}.log.gz</fileNamePattern>    
    			
    			<maxHistory>${log.maxHistory}</maxHistory>
    		</rollingPolicy>
            
    		<encoder>
    			<pattern>${log.pattern}</pattern>
    		</encoder>
    		
    		<filter class="ch.qos.logback.classic.filter.LevelFilter">
    			<level>DEBUG</level>
    			<onMatch>ACCEPT</onMatch>
    			<onMismatch>DENY</onMismatch>
    		</filter>
    	</appender>
    	
    	<appender name="infoAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
    		<file>${log.filePath}/info.log</file>
    		<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
    			<fileNamePattern>${log.filePath}/info/info.%d{yyyy-MM-dd}.log.gz</fileNamePattern>
    			<maxHistory>${log.maxHistory}</maxHistory>
    		</rollingPolicy>
    		<encoder>
    			<pattern>${log.pattern}</pattern>
    		</encoder>
    		<filter class="ch.qos.logback.classic.filter.LevelFilter">
    			<level>INFO</level>
    			<onMatch>ACCEPT</onMatch>
    			<onMismatch>DENY</onMismatch>
    		</filter>
    	</appender> 
    	
    	<appender name="errorAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
    		<file>${log.filePath}/error.log</file>
    		<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
    			<fileNamePattern>${log.filePath}/error/error.%d{yyyy-MM-dd}.log.gz</fileNamePattern>
    			<maxHistory>${log.maxHistory}</maxHistory>
    		</rollingPolicy>
    		<encoder>
    			<pattern>${log.pattern}</pattern>
    		</encoder>
    		<filter class="ch.qos.logback.classic.filter.LevelFilter">
    			<level>ERROR</level>
    			<onMatch>ACCEPT</onMatch>
    			<onMismatch>DENY</onMismatch>
    		</filter>
    	</appender>
    	
    	 
    	<logger name="com.lxc.o2o" level="${log.level}" additivity="true">
    		<appender-ref ref="debugAppender"></appender-ref>
    		<appender-ref ref="infoAppender"></appender-ref>
    		<appender-ref ref="errorAppender"></appender-ref>
            
    	</logger>
    	
    	
    	<root level="info">
          
    		<appender-ref ref="consoleAppender"></appender-ref>
    	</root>
    </configuration>

*  层级Level
    
    对于一个给定的名为 *L* 的 `logger`，它的有效层级为从自身一直回溯到 `root logger`，直到找到第一个不为空的层级作为自己的层级。为了确保所有的 `logger` 都有一个层级，`root logger` 会有一个默认层级 — `DEBUG`。
 *  appender叠加
    
    自动叠加父类的`appender`，除非这个`logger`的属性`additivity`设置为`false`。所以上面配置的层级com.lxc.o2o也会继承root的appender，在控制台中打印信息

**日志的使用**

@Controller
    @RequestMapping("/superadmin")
    public class AreaController { 
        
    	Logge
            ggerFactory.getLogger(AreaController.class);
        
        
    	@Autowired
    	private AreaService areaService;
    
    	@RequestMapping(value = "/listarea", method = RequestMethod.GET)
    	@ResponseBody
    	public Map<String, Object> listArea() { 
    		logger.info("=======start========");
    		long startTime = System.currentTimeMillis();
    		Map<String, Object> modelMap = new HashMap<String, Object>();
    		List<Area> list = new ArrayList<>();
    		try { 
    			list = areaService.getAreaList();
    			modelMap.put("rows", list);
    			modelMap.put("total", list.size());
    		} catch (Exception e) { 
    			e.printStackTrace();
    			modelMap.put("success", false);
    			modelMap.put("errMsg", e.toString());
    		}
    		logger.error("error test");
    		long endTime = System.currentTimeMillis();
    		logger.debug("costTime:[{}ms]", endTime - startTime);//输出costTime:[12ms]
    		logger.info("========end=========");
    		return modelMap;
    	}
    }

[catalina.home_catalina.base]: https://www.cnblogs.com/leihenqianshang/articles/4153270.html
[Tomcat_ _ CATALINA_HOME_CATALINA_BASE]: https://blog.csdn.net/jiaotuwoaini/article/details/51455829