java 中使用log4j

时间：2023-03-08 17:01:03

一、控制台使用

1、导入log4j包到工程中

java 中使用log4j

2、配置：

log4j.rootLogger=DEBUG,console,R

log4j.appender.console=org.apache.log4j.ConsoleAppender

log4j.appender.console.threshold=INFO

log4j.appender.console.layout=org.apache.log4j.PatternLayout

log4j.appender.R=org.apache.log4j.RollingFileAppender

log4j.appender.R.Append=true

log4j.appender.R.File=main.log

log4j.appender.R.Threshold=DEBUG

log4j.appender.R.layout=org.apache.log4j.PatternLayout

log4j.appender.R.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%5p] - %c -%F(%L) -%m%n

log4j.appender.R.MaxFileSize=20MB

log4j.org.springframework.web=DEBUG

工程结构如图:

java 中使用log4j

3、使用：

public class Main {

   static   org.apache.log4j.Logger logger=org.apache.log4j.LogManager.getLogger(Main.class);

    public static void main(String[] args) {

        logger.info("main");

        System.out.println("Hello World!");

    }

}

二、Java Web中使用

1、导入log4j包到工程中

2、log4j配置（同上）

3、在Web.xml中配置l加载og4j

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

         version="3.1">

    <context-param>

        <param-name>contextConfigLocation</param-name>

        <param-value>/WEB-INF/applicationContext.xml,/WEB-INF/dispatcher-servlet.xml</param-value>

    </context-param>

    <context-param>

        <param-name>log4jConfigLocation</param-name>

        <param-value>/WEB-INF/log4j.properties</param-value>

    </context-param>

    <context-param>

        <param-name>log4jRefreshInterval</param-name>

        <param-value>60000</param-value>

    </context-param>

    <listener>

        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

    </listener>

    <listener>

        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>

    </listener>

    <servlet>

        <servlet-name>dispatcher</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>dispatcher</servlet-name>

        <url-pattern>*.form</url-pattern>

    </servlet-mapping>

</web-app>

4、使用同上

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