基于 maven 的 ssm 项目搭建四：整合 log4j

1、修改pom.xml

加入如下配置：

<dependency>    <groupId>org.slf4j</groupId>    <artifactId>slf4j-api</artifactId>    <version>1.6.6</version></dependency><dependency>    <groupId>org.slf4j</groupId>    <artifactId>slf4j-log4j12</artifactId>    <version>1.6.6</version></dependency><dependency>    <groupId>log4j</groupId>    <artifactId>log4j</artifactId>    <version>1.2.16</version></dependency>

修改后的pom.xml内容如下：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>com.whowii</groupId>  <artifactId>website_java3</artifactId>  <packaging>war</packaging>  <version>0.0.1-SNAPSHOT</version>  <name>website_java3 Maven Webapp</name>  <url>http://maven.apache.org</url>  <dependencies>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>3.8.1</version>      <scope>test</scope>    </dependency>    <!-- spring -->    <dependency>        <groupId>org.springframework</groupId>        <artifactId>spring-context</artifactId>        <version>${springVersion}</version>    </dependency>    <dependency>        <groupId>org.springframework</groupId>        <artifactId>spring-webmvc</artifactId>        <version>${springVersion}</version>    </dependency>    <!-- log4j -->    <dependency>        <groupId>org.slf4j</groupId>        <artifactId>slf4j-api</artifactId>        <version>1.6.6</version>    </dependency>    <dependency>        <groupId>org.slf4j</groupId>        <artifactId>slf4j-log4j12</artifactId>        <version>1.6.6</version>    </dependency>    <dependency>        <groupId>log4j</groupId>        <artifactId>log4j</artifactId>        <version>1.2.16</version>    </dependency>  </dependencies>  <build>    <finalName>website_java3</finalName>  </build>  <properties>    <springVersion>4.3.8.RELEASE</springVersion>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties></project>

2、修改web.xml

加入log4j配置，修改后的web.xml内容如下：

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"  xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"    version="3.0">  <display-name></display-name><context-param><param-name>webAppRootKey</param-name><!-- 同时部署多个站点时不允许相同，log4j中的相关配置项受该值影响 --><param-value>whowii.website3</param-value></context-param><!-- log4j 配置 --><context-param><param-name>log4jConfigLocation</param-name><param-value>classpath: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.util.Log4jConfigListener</listener-class></listener><!-- spring mvc 配置 --><servlet><servlet-name>spring</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!-- 配置spring servlet文件名称 --><init-param>    <param-name>contextConfigLocation</param-name>    <param-value>    classpath:spring-servlet.xml    </param-value>    </init-param><!-- load-on-startup：表示启动容器时初始化该Servlet --><load-on-startup>1</load-on-startup></servlet><servlet-mapping>  <servlet-name>spring</servlet-name>  <url-pattern>*.do</url-pattern></servlet-mapping></web-app>

3、添加 log4j 配置文件

在 src/main/resources 目录下添加文件“log4j.properties”，文件内容如下：

#################### Console Appender###################log4j.appender.CONSOLE                          = org.apache.log4j.ConsoleAppenderlog4j.appender.CONSOLE.Target                   = System.outlog4j.appender.CONSOLE.Threshold                = ERRORlog4j.appender.CONSOLE.layout                   = org.apache.log4j.PatternLayoutlog4j.appender.CONSOLE.layout.ConversionPattern = \r\n\u7EA7\u522B\:%p\r\n\u4FE1\u606F\:%m\r\n\u4F4D\u7F6E\:%l\r\n\u65F6\u95F4\:%d\r\n\u7C7B\u76EE\:%c\r\n\u7EBF\u7A0B\:%t\r\n######################### DailyRolling File########################log4j.appender.FILE                             = org.apache.log4j.RollingFileAppenderlog4j.appender.FILE.File                        = ${whowii.website2}/WEB-INF/logs/syslog.loglog4j.appender.FILE.MaxBackupIndex              = 5log4j.appender.FILE.MaxFileSize                 = 2000KBlog4j.appender.FILE.Threshold                   = WARNlog4j.appender.FILE.layout                      = org.apache.log4j.PatternLayoutlog4j.appender.FILE.layout.ConversionPattern    = [%-5p] %d{yyyy-MM-dd HH\:mm\:ss,SSS} method\:%l%n%m%n\r\nlog4j.logger.org.apache                         = INFOlog4j.rootLogger                                = DEBUG,CONSOLE,FILE

项目现有的结构如下：
 

4、添加测试代码

修改DemoController.java，完成的内容如下：

package com.whowii.core.manage.controller; import org.apache.log4j.Logger;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping; @Controllerpublic class DemoController {    private Logger logger = Logger.getLogger(getClass());     @RequestMapping("/index")    public String index(){        logger.error(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");        return "demo";    }}

5、测试结果

打开浏览器，访问：http://localhost:8080/website_java3/index.do，
在MyEclipse的控制台窗口有输出如下：
 
在WEB-INF目录中自动生成了logs/syslog.log文件，内容如下：
[ERROR] 2017-06-08 11:48:11,266 method:com.whowii.core.manage.controller.DemoController.index(DemoController.java:13)

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>