logback输出日志到不同文件

需求:

  • 不同包的日志可能要放到不同的文件中,如service层和dao层的日志;
  • 不同日志级别:调试、信息、警告和错误等也要分文件输出。

一、根据包输出,通过logger的name属性指定不同的包

1.创建不同包下的两个类:

package com.cheng.service;  
  
@Service  
public class ObligationService {  
    static final Logger log = LoggerFactory.getLogger(ObligationService.class);  
  
    @Resource  
    ObligationDao dao;  
      
    public void obligate() {  
        log.debug("obligate start...");  
        dao.queryObligations();  
        log.error("An error occurred during the progress");  
        log.debug("obligate end...");  
    }  
}  
package com.cheng.dao;  
  
@Repository  
public class ObligationDao {  
    static final Logger log = LoggerFactory.getLogger(ObligationDao.class);  
      
    public void queryObligations() {  
        log.debug("query obligations start...");  
        log.error("An error occurred during the query");  
        log.debug("query obligations end...");  
    }  
}  

2.在logback.xml中添加:

  
    /logs/bribery.log  
      
        /logs/bribery-%d{yyyy-MM-dd}.log  
      
      
        %d{HH:mm:ss.SSS} [%thread] %-5level %logger{5} - %msg%n  
      
  
  
  
    /logs/venality.log  
      
        /logs/venality-%d{yyyy-MM-dd}.log  
      
      
        %d{HH:mm:ss.SSS} [%thread] %-5level %logger{5} - %msg%n  
      
  
  
  
      
  
  
  
      
  

在类路径下创建Spring的beans.xml文件:
Xml代码:

  

3.测试方法:

@Test  
public void dispatchByPackageTest() {  
    AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");  
    ObligationService service = ctx.getBean(ObligationService.class);  
    service.obligate();  
}  

执行测试后,

bribery.log:
15:59:59.839 [main] DEBUG c.j.s.ObligationService - obligate start…
15:59:59.844 [main] ERROR c.j.s.ObligationService - An error occurred during the progress
15:59:59.844 [main] DEBUG c.j.s.ObligationService - obligate end…

venality.log:
15:59:59.844 [main] DEBUG c.j.d.ObligationDao - query obligations start…
15:59:59.844 [main] ERROR c.j.d.ObligationDao - An error occurred during the query
15:59:59.844 [main] DEBUG c.j.d.ObligationDao - query obligations end…

二、根据日志级别输出

这里把所有级别为ERROR的日志输出到一个文件中

1.修改logback.xml文件
serviceAppender和daoAppender都加入以下级别过滤器,这样错误日志就不会在bribery.log和venality.log中打印了:

  
    ERROR  
    DENY  
    ACCEPT  
  

新建一个错误日志的appender:

  
    /logs/error.log  
      
        /logs/venality-%d{yyyy-MM-dd}.log  
      
      
        %d{HH:mm:ss.SSS} %thread %X{invokeNo} %logger{40} %msg%n  
      
      
        ERROR  
        ACCEPT  
        DENY  
      
  

name为com.cheng.dao和com.cheng.service的logger都加上errorAppender:

  

2. 执行上面的测试方法,service和dao的错误日志都打印到error.log文件中了:

16:12:51,433 main com.john.dao.ObligationDao An error occurred during the query
16:12:51,433 main com.john.service.ObligationService An error occurred during the progress

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