浅谈log4j

不爱打字，贴代码。

• 导包

• 入门程序

//日志级别  all<debug<info<warn<error<fatal<off
    public static void main(String[] args) {
        Logger logger=Logger.getLogger(Test.class);
        //读取默认配置
        BasicConfigurator.configure();
        //配置日志级别，低于设置级别的 不会打印
        logger.setLevel(Level.INFO);
        //打印语句  低于info级别的不会打印
        logger.error("this is error");
        logger.warn("this is warn");
        logger.info("this is info");
        logger.debug("this is debug");
    }

• 结果打印

0 [main] ERROR log4j.Test  - this is error
1 [main] WARN log4j.Test  - this is warn
1 [main] INFO log4j.Test  - this is info