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先看Spring Boot中依赖的logback,log4j,slf4j相关Jar包

1.最简单的默认打印控制台日志 

import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class ImportDemoController {Logger logger= LoggerFactory.getLogger(ImportDemoController.class);    @Autowired    private User user;    @Autowired    private ImportDemo importDemo;    @Autowired    private User01 user01;    @Autowired    private UserFactoryBean userFactoryBean;    @Autowired    private UserLazy userLazy;    @RequestMapping("/importDemo")    public String demo() throws Exception {        logger.info("ImportDemoController 开始>>>");        importDemo.doSomething();        user01.username = "user01";        String s = user.username;        String s1 = user01.username;        String s4 = userFactoryBean.getObject().username;        String s5=userLazy.username;        logger.info("ImportDemoController 结束<<<");        return "ImportDemo@SpringBoot " + s + " " + s1 + " " + s4+  " " + s5;    }}

注意需要引入：org.slf4j相关包。

2.修改日志级别

日志级别 trace<debug<info<warn<error<fatal

默认级别为info，默认打印info及其以上级别的日志，默认不打印debug日志，

public String demo() throws Exception {        logger.debug("ImportDemoController 开始>>>");        importDemo.doSomething();        user01.username = "user01";        String s = user.username;        String s1 = user01.username;        String s4 = userFactoryBean.getObject().username;        String s5=userLazy.username;        logger.debug("ImportDemoController 结束<<<");        return "ImportDemo@SpringBoot " + s + " " + s1 + " " + s4+  " " + s5;    }

修改Spring Boot配置文件即可打印debug日志

application.properties

logging.level.root=debug

logging.level设置日志级别，后面跟生效的区域，比如root表示整个项目，也可以设置为某个包下，也可以具体到某个类名（日志级别的值不区分大小写） 

logging.level.root=info就是默认的情况，你改为我上面那样就打印出debug了，开发环境打印，线上是不允许的。

3.使用logback.xml配置文件实现更精细的配置

logback.xml和application.properties放在同一层目录即可，这个logback.xml非常好，源自网络，只要简单修改存储路径和对应的包空间就可以直接在项目中使用了

   
   
       
        
        
        
        
        
        
            
             
                 
      
       ${log.pattern}
              
         
        
        
        
            
             
             
     
      ${log.filePath}/debug.log
             
             
                 
                  
      
       ${log.filePath}/debug/debug-%d{yyyy-MM-dd}.log.gz            
                  
                  
      
       ${log.maxHistory}
              
             
             
                 
      
       ${log.pattern}
              
             
             
                 
      
       debug
                  
      
       ACCEPT
                  
                  
      
       DENY
              
         
        
        
            
             
     
      ${log.filePath}/info.log
             
             
                 
                  
      
       ${log.filePath}/info/info-%d{yyyy-MM-dd}.log.gz            
                  
                  
      
       ${log.maxHistory}
              
             
             
                 
      
       ${log.pattern}
              
             
             
                 
      
       info
                  
      
       ACCEPT
                  
                  
      
       DENY
              
         
        
        
            
             
     
      ${log.filePath}/error.log
             
             
                 
                  
      
       ${log.filePath}/error/error-%d{yyyy-MM-dd}.log.gz            
                  
                  
      
       ${log.maxHistory}
              
             
             
                 
      
       ${log.pattern}
              
             
             
                 
      
       error
                  
      
       ACCEPT
                  
                  
      
       DENY
              
         
        
        
            
             
             
             
             
             
         
        
        
        
            
             
         
    
   

我的配置是写在D盘log目录下，可以根据需要设置。 

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