日志的使用-log4j

Posted 2020-12-25 renjing

1,首先添加对log4j-core-2.6.2.jar,log4j-api-2.6.2.jar的引用.

https://files.cnblogs.com/files/renjing/log4j.zip

2,新增一个xml配置文件并防止在项目根目录下(web项目放在/src目录下),配置内容如下.

<?xml version="1.0" encoding="UTF-8"?>  
<configuration status="OFF">
    <appenders>
        <Console name="CONSOLE" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
        </Console>
        <RollingFile name="ROLLING" fileName="d:/logs/log.log"
             filePattern="d:/logs/log_%d{yyyy-MM-dd}_%i.log">
            <PatternLayout pattern="%d %p %c{1.} [%t] %m%n"/>
            <Policies>
                <TimeBasedTriggeringPolicy modulate="true" interval="24"/>
                <SizeBasedTriggeringPolicy size="1024 KB"/>
            </Policies>
            <DefaultRolloverStrategy max="20"/>
        </RollingFile>
    </appenders>
    <loggers>
        <root level="debug">
            <appender-ref ref="CONSOLE" />
            <appender-ref ref="ROLLING"/>
        </root>
    </loggers>
</configuration>

3,测试代码

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class Main1 {

    // 规则：1、一个类一个Logger对象。声明为static final
    // getLogger()这里一般用当前类的Class
    private static final Logger logger = LogManager.getLogger(Main1.class);

    public static void main(String[] args) {

        for(int i=0;i<10000000;i++)
        {
            logger.error("输入错误，转换失败"+i);
        }        
    }
}