1 package com.study.spring_boot_log; 2  3 import org.springframework.boot.SpringApplication; 4 import org.springframework.boot.autoconfigure.SpringBootApplication; 5 import org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration; 6 import org.springframework.context.ConfigurableApplicationContext; 7  8 import com.study.spring_boot_log.dao.UserDao; 9 import com.study.spring_boot_log.service.UserService;36 @SpringBootApplication(exclude=WebSocketAutoConfiguration.class)37 public class App {38     public static void main(String[] args) {39         ConfigurableApplicationContext context = SpringApplication.run(App.class,args);40         context.getBean(UserDao.class).log();41         System.out.println("===================");42         context.getBean(UserService.class).log();43         44         context.close();45     }46 }

 pom.xml:

1 
     
       3     
      
       4.0.0
       4  5     
      
       com.study.springboot
       6     
      
       spring-boot-log
       7     
      
       1.0.0
       8     
      
       jar
       9 10     
      
       spring-boot-log
      11     
      
       http://maven.apache.org
      12 13     
      
       14         
       
        UTF-8
       15     
      16 17     
      
       18         
       
        19             
        
         20                 
         
          org.springframework.boot
         21                 
         
          spring-boot-dependencies
         22                 
         
          1.5.3.RELEASE
         23                 
         
          import
         24                 
         
          pom
         25             
        26         
       27     
      28 29     
      
       30         
       
        31             
        
         org.springframework.boot
        32             
        
         spring-boot-starter
        33         
               34     
      35 
     

 

1 package com.study.spring_boot_log.dao; 2  3 import org.slf4j.Logger; 4 import org.slf4j.LoggerFactory; 5 import org.springframework.stereotype.Component; 6  7 @Component 8 public class UserDao { 9     private Logger log = LoggerFactory.getLogger(UserDao.class);10     public void log() {11         log.debug("user dao debug log");12         log.info("user dao info log");13         log.warn("user dao warn log");14         log.error("user dao error log");15     }16 }

 

1 package com.study.spring_boot_log.service; 2  3 import org.slf4j.Logger; 4 import org.slf4j.LoggerFactory; 5 import org.springframework.stereotype.Component; 6  7 @Component 8 public class UserService { 9     private Logger log = LoggerFactory.getLogger(UserService.class);10     public void log() {11         log.debug("user service debug log");12         log.info("user service info log");13         log.warn("user service warn log");14         log.error("user service error log");15     }16 }

 

springboot默认 的日志级别是info

可以通过logging.level.*=debug配置项设置，*可以是包，也可以是某个类。

也可以在Run Configurations中配置 --debug，或者SpringApplication.run(App.class,“--debug=true”)。这两种debug只会是springboot默认，自定义的类不会debug。

日志级别有：TRACE,DEBUG,INFO,WARN,ERROR,FATA,OFF

日志级别配置成OFF，表示关闭日志输出

logging.file 指定日志文件路径名字

logging.path 指定日志目录(此时的日志名字为spring.log)

日志文件输出，文件的大小10M之后，就会分割

logging.pattern.console 配置控制台输出日志的pattern

logging.file.console 配置日志文件输出日志的pattern

application.properties

1 logging.level.com.study.spring_boot_log.dao.UserDao=off2 logging.level.com.study.spring_boot_log.service.UserService=DEBUG3 4 logging.file=D:/ivy/mylog5 logging.path=D:/ivy/mylogs6 7 logging.pattern.console=%-20(%d{yyyy-MM-dd} [%thread]) %-5level %logger{80} - %msg%n8 logging.file.console=%-20(%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread]) %-5level %logger{80} - %msg%n

 

springboot 默认支持logback

也就是说，只需要在classpath下放一个logback.xml，logback-spring.xml的文件，即可定制日志的输出

logback-spring.xml或logback.xml：

1 
        2 
     
         3   
      
          4     
       
           5       
        
         %-20(%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread]) %-5level %logger{80} - %msg%n
           6     
          7   
         8    9   10   
      
         11     
         12   
        13 
     

 

使用其他的日志组件的步骤：

1.排除默认的日志组件：spring-boot-starter-logging

2.加入新的日志路径依赖

3.把相应的配置文件放在classpath下

log4j2.xml：

1 
        2 
     
       3     
      
          4         
       
           5           
           6         
         7    
       8    
      
          9     
       
          10       
         11     
         12   
       13