Spring-LogBack笔记(1) - 基础使用

迈不过友情╰ 2023-07-15 09:07 15阅读 0赞

Spring内部集成了LogBack的日志组件

日志等级分为6种

public enum LogLevel {
    
    	TRACE, DEBUG, INFO, WARN, ERROR, FATAL, OFF
    
    }

OFF是关闭日志

其他6种从低到高分别是

TRACE < DEBUG < INFO < WARN < ERROR < FATAL

FATAL这个比较特殊，log的方法里面没有这个方法，指出每个严重的错误事件将会导致应用程序的退出。这个级别比较高了。重大错误，这种级别你可以直接停止程序了

在spring里面可以通过配置文件对每个类或者包的日志等级进行控制，低于配置等级的日志将不会执行

在spring里面使用日志打印也很简单，主要有两种方式

一种是通过LogFactory

private Logger logger = LoggerFactory.getLogger(LogController.class);
    
    
        private void print(String key) {
            logger.trace("key: {}", key);
            logger.debug("key: {}", key);
            logger.info("key: {}", key);
            logger.warn("key: {}", key);
            logger.error("key: {}", key);
            System.out.println("key: {}" + key);
        }

另外一种通过@Slf4j在类上面的注解可以直接使用，这种需要先引入Lombok的包

private void print(String key) {
            log.trace("key: {}", key);
            log.debug("key: {}", key);
            log.info("key: {}", key);
            log.warn("key: {}", key);
            log.error("key: {}", key);
            System.out.println("key: {}" + key);
        }

这里就使用@Slf4j在类上面的注解形式在测试

#### 默认配置所有的日志等级都是info，日志等级配置不区分大小写 ####

写个demo测试一下

@Slf4j
    @RestController
    @RequestMapping("/log")
    public class LogController {
    
        private void print(String key) {
            log.trace("key: {}", key);
            log.debug("key: {}", key);
            log.info("key: {}", key);
            log.warn("key: {}", key);
            log.error("key: {}", key);
            System.out.println("key: {}" + key);
        }
    
    
        @GetMapping("/test")
        public String test(@RequestParam String key) {
            print(key);
            return key;
        }
    }

输出打印

[http-nio-8801-exec-1] INFO  com.mt.demo.client.controller.LogController - key: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
    [http-nio-8801-exec-1] WARN  com.mt.demo.client.controller.LogController - key: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
    [http-nio-8801-exec-1] ERROR com.mt.demo.client.controller.LogController - key: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
    key: {}aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

例如配置

logging:
      level:
        com:
          mt:
            demo:
              client:
                controller:
                  LogController: error

输出打印

[http-nio-8801-exec-2] ERROR com.mt.demo.client.controller.LogController - key: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
    key: {}aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

#### 这种可以配置的方式在生产调试问题的时候还是比较方便的，例如在程序里打上debug的日志，需要调试的时候再动态开启 ####

logging:
      level:
        com:
          mt:
            demo:
              client:
                controller:
                  LogController: debug

输出打印

[http-nio-8801-exec-1] DEBUG com.mt.demo.client.controller.LogController - key: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
    [http-nio-8801-exec-1] INFO  com.mt.demo.client.controller.LogController - key: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
    [http-nio-8801-exec-1] WARN  com.mt.demo.client.controller.LogController - key: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
    [http-nio-8801-exec-1] ERROR com.mt.demo.client.controller.LogController - key: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
    key: {}aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

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![在这里插入图片描述][70]

[70]: /images/20230528/a0e1942d72544cfea5ed89f2a2ca0424.png