使用LoggerFactory.getLogger(xxx.class)方法在控制台打印日志信息

今天药忘吃喽~ 2023-10-01 17:12 2阅读 0赞

使用System.out.println()来调试.但是用这种方式开发项目部署到生产环境,会因为众多的控制台输出降低应用的性能.这时候Log4J就成为可平衡开发和部署应用的利器了.

使用指定的类XXX初始化日志对象，方便在日志输出的时候，可以打印出日志信息所属的类。

public class CaseAutoPullController {
        
        //初始化LoggerFactory对象 , CaseAutoPullController是日志所属的类
        private final static Logger logger = LoggerFactory.getLogger(CaseAutoPullController.class);
        
        @RequestMapping(value = "importCase")
        @ResponseBody
        public SimpleResult importCase(Model model, @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date startTime,
                                       @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date endTime) throws InterruptedException {
        
            //使用info方法打印日志
            logger.info("手动导入案件，参数startTime={}，endTime={}", startTime, endTime);
            
            //..........
         }
    }

**结果:**  
会在控制台打印出: 手动导入案件，参数startTime=开始的时间参数，endTime=结束的时间参数  
在控制台打印日志信息，往往会在每个类上加上一行代码。具体的用法Log.info(“要打印的内容”)。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0MTU0OTEy_size_16_color_FFFFFF_t_70]通过**Ait + F1 + 1** 查出LoggerFactory的位置 ,来自于org.slf4j

可以在log4j.properties配置日志参数

参考文档:  
[log4j.properties 详解与配置步骤][log4j.properties]

**参考文档:**  
[LoggerFactory.getLogger(xxx.class)用法详解][LoggerFactory.getLogger_xxx.class]

关于参数及日志工具类看下面这篇:  
[Logger之Logger.getLogger(CLass)][Logger_Logger.getLogger_CLass]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0MTU0OTEy_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20210407173721462.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0MTU0OTEy,size_16,color_FFFFFF,t_70
[log4j.properties]: https://blog.csdn.net/sinat_30185177/article/details/73550377?ops_request_misc=%7B%22request%5Fid%22%3A%22161778871516780262569839%22%2C%22scm%22%3A%2220140713.130102334..%22%7D&request_id=161778871516780262569839&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend~default-1-73550377.first_rank_v2_pc_rank_v29&utm_term=log4j.properties
[LoggerFactory.getLogger_xxx.class]: https://blog.csdn.net/weixin_45267219/article/details/107615272?ops_request_misc=%7B%22request%5Fid%22%3A%22161778747716780264072464%22%2C%22scm%22%3A%2220140713.130102334.pc%5Fall.%22%7D&request_id=161778747716780264072464&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~first_rank_v2~rank_v29-3-107615272.first_rank_v2_pc_rank_v29&utm_term=LoggerFactory.getLogger%28CaseAutoPullController.class%29;
[Logger_Logger.getLogger_CLass]: https://blog.csdn.net/lixwjava/article/details/45950559?utm_medium=distribute.pc_relevant.none-task-blog-2~default~BlogCommendFromMachineLearnPai2~default-1.control&dist_request_id=1328767.81143.16177874958576821&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2~default~BlogCommendFromMachineLearnPai2~default-1.control