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Spring MVC集成 Log4j


环境及工具:
Log4j 2.6.2
Spring 4.3.2.RELEASE
Maven 3
Tomcat 8(idea中tomcat配,
IntelliJ IDEA 15.0.6(开启maven自动导入)

默认情况下,Spring(spring-core)是使用JCL(commons-logging)日志记录、JCL运行时能通过发现算法在项目类路径下找出其他日志框架。

为了集成log4j你需要做以下几个事情:
1、将log4j.jar放到项目类路径下
2、创建log4j.properties或者 log4j.xml在项目根类路径下(如果你遵循Maven标准目录结构,该文件应该放在resources 文件夹下 )

1. 项目目录

以下是最终的项目结构:

Spring MVC集成 Log4j_log4j

2、项目依赖

<properties>
<spring.version>4.3.2.RELEASE</spring.version>
<log4j.version>2.6.2</log4j.version>
</properties>

<dependencies>

<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>

<!-- Log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>

</dependencies>

3. log4j.properties

创建log4j.properties文件,并把它放到resources文件夹下,参考上面的项目目录结构。

# Root logger option
log4j.rootLogger=DEBUG, stdout, file

# Redirect log messages to console
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=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

# Redirect log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
#outputs to Tomcat home
log4j.appender.file.File=${catalina.home}/logs/myapp.log
log4j.appender.file.MaxFileSize=5MB
log4j.appender.file.MaxBackupIndex=10
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

4. Spring MVC Controller + Message Logging

一个简单的controller 返回一个welcome页面,该controller将展示如何用log4j 记日志。

package com.jiankunking.controller;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class WelcomeController
{

private static final Logger logger = Logger.getLogger(WelcomeController.class);

@RequestMapping(value = "/", method = RequestMethod.GET)
public ModelAndView getWelcome()
{
//logs debug message
if (logger.isDebugEnabled())
{
logger.debug("getWelcome is executed!");
}

//logs exception
logger.error("This is Error message", new Exception("Testing"));

ModelAndView model = new ModelAndView("welcome");
model.addObject("msg", "Hello Spring MVC + Log4j");
return model;

5、源码下载

作者:jiankunking​


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