org.apache.log4j的日志记录级别和基础使用Demo

org.apache.log4j的日志记录级别和基础使用Demo，本次案例展示，使用是的maven项目，搭建的一个简单的爬虫案例。里面采用了大家熟悉的日志记录插件，log4j。来自apache公司的开源插件。

package com.qian.test;

import org.apache.log4j.Logger;

public class Log4jTest {
    static final Logger logger = Logger.getLogger(Log4jTest.class);

    public static void main(String[] args) {
        System.out.println("hello");
        //日志信息
        logger.info("hello world");
        logger.debug("This is debug message");
        logger.warn("This is warn message");
        logger.error("This is error message");
    }
}

如图，我特意把错误的存档位置给大家标记了一下。

应该是存档在resources下面才是正确的哦。

###??? Logger###
log4j.rootLogger = debug,stdout,D,E,W
###????????###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = %p[%d{yyyy-MM-dd HH\:mm\:ss,SSS}] [%t] %C.%M(%L) | %m%n
###??DEBUG????????=E://logs/error.log###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = E:/logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %p[%d{yyyy-MM-dd HH\:mm\:ss,SSS}] [%t] %C.%M(%L) | %m%n
###??ERROR???????? E:/logs/error.log###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File = E:/logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.HTMLLayout
log4j.appender.E.layout.LocationInfo = true
log4j.appender.E.layout.Title = Test_Error
###??INFO????????E://logs/warn.log###
log4j.appender.W = org.apache.log4j.RollingFileAppender
log4j.appender.W.File = E:/logs/warn.log
log4j.appender.W.Append = true
log4j.appender.W.Threshold = WARN
log4j.appender.W.MaxFileSize = 2KB
log4j.appender.W.layout = org.apache.log4j.HTMLLayout
log4j.appender.W.layout.LocationInfo = true
log4j.appender.W.layout.Title = Test_Warn

实际运行测试效果是正常的。