web项目添加log4j

在web项目中添加log4j支持，文中使用maven搭建的SpringMVC环境，当然也可以使用其它的环境，这里主要介绍的是log4j的添加，其它的东西大家可以使用自己之前已经做好的web项目也是一样的：

1.使用maven添加所需要的jar包，当然也可以自己手动添加：

pom.xml

<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>mavenWeb</groupId>
	<artifactId>mavenweb</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>mavenweb Maven Webapp</name>
	<url>http://maven.apache.org</url>
	
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<spring.version>3.0.5.RELEASE</spring.version>
		<junit.version>4.8.2</junit.version>
		<netbeans.hint.deploy.server>Tomcat</netbeans.hint.deploy.server>
		<slfv5_common.version>1.0.9-beta</slfv5_common.version>
		<slf4j.version>1.6.6</slf4j.version>
		<log4j.version>1.2.17</log4j.version>  
		<proxool.version>0.9.1</proxool.version> 
		<mysql-client.version>5.1.21</mysql-client.version>
		<memcached-client.version>2.6.6</memcached-client.version>
		<sitemesh.version>2.4.2</sitemesh.version>
		<spring-json.version>1.9.9</spring-json.version>
	</properties>
	
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>3.0.5.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>3.0.5.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.apache.geronimo.specs</groupId>
			<artifactId>geronimo-servlet_2.5_spec</artifactId>
			<version>1.2</version>
		</dependency>

		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>${slf4j.version}</version>
			<scope>compile</scope>
		</dependency>
		
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>${slf4j.version}</version>
			<scope>compile</scope>
		</dependency>
		
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>${log4j.version}</version>
			<scope>compile</scope>
		</dependency>

	</dependencies>

	<build>
		<finalName>mavenweb</finalName>
	</build>

</project>

 完成之后会看到添加了如下jar包：

 

2.编写log4j.xml文件，其它log4j.xml的文件路径在发布到Tomcat的时候是在对应的目录是在E:\apache-tomcat-6.0.35\webapps\mavenweb\WEB-INF\classes中，所以在开发是大家要注意log4j.xml新建的位置：

 <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

	<!-- Appenders -->
	
	<appender name="files" class="org.apache.log4j.DailyRollingFileAppender">
		<param name="File" value="${catalina.base}/logs/mytest.log"/>
		<param name="DatePattern" value="'.'yyyy-MM-dd'.log'"/>
		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss SSS\} %-5p] [%t] %c{3\} - %m%n"/>
		</layout>
	</appender>
	
	<appender name="console" class="org.apache.log4j.ConsoleAppender">
		<param name="Target" value="System.out" />
		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss SSSS\} %-5p] [%t] %c{3\} - %m%n" />
		</layout>
	</appender>
	
	<!-- Application Loggers -->
	<logger name="org.springframework.samples.mvc">
		<level value="info" />
		<appender-ref ref="files"/>
	</logger>
	
	<logger name="com.zxhz.maventest">
		<level value="info" />
		<appender-ref ref="files"/>
	</logger>
	
	<!-- 3rdparty Loggers -->
	<logger name="org.springframework.core">
		<level value="info" />
		<appender-ref ref="files"/>
	</logger>
	
	<logger name="org.springframework.beans">
		<level value="info" />
		<appender-ref ref="files"/>
	</logger>
	
	<logger name="org.springframework.context">
		<level value="info" />
		<appender-ref ref="files"/>
	</logger>

	<logger name="org.springframework.http">
		<level value="debug" />
		<appender-ref ref="files"/>
	</logger>

	<logger name="org.springframework.web">
		<level value="debug" />
		<appender-ref ref="files"/>
	</logger>

	<!-- Root Logger -->
	<root>
		<priority value="warn" />
		<appender-ref ref="console" />
	</root>
	
</log4j:configuration>

 这里就不说明每个属性了，需要了解的同学可以去找到一下别的文章。

web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
     http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

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

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

	<servlet-mapping>
		<servlet-name>maven</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
</web-app>

 关于web.xml的写法，有一般情况下都会在在web.xml中加上以下代码：

<!--在web.xml中配置log4j的动态加载监听器-->
<context-param>
  <param-name>log4jConfigLocation</param-name>
  <param-value>classpath:log4j.properties</param-value>
  </context-param>
 <listener>
  <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
  </listener>

 但在上面的web.xml文件中并没有加入这些代码那是因为如果你的log4j.xml是放在classpath下，log4jConfigLocation是没有必要配置的，因为默认的 路劲就是classpath。spring的log4jConfigListener是用来监听log4j配置的变更的，如果设置了这个 监听器，则以后log4j的配置发生变化时，你不用重新编译打包发布项目。spring会自动加载变更后的 配置文件

maven-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Bean头部 -->
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
             http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd  
             http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd              
             http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">

	<!-- 激活@Controller模式 -->
	<mvc:annotation-driven />
	<!-- 对包中的所有类进行扫描，以完成Bean创建和自动依赖注入的功能 需要更改 -->
	<context:component-scan base-package="com.zxhz" />

	<bean
		class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />

	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix">
			<value>/WEB-INF/jsp/</value>
		</property>
		<property name="suffix">
			<value>.jsp</value>
		</property>
	</bean>
</beans>

3.在相对应的类中定义Loger以下有两个类以及页面文件：

LoginController.java

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class LoginController {
        /***
        * 在这里并没有去加载log4j.xml,也没有在web.xml
        * 文件中设置log4j.xml,这是因为Spring框架默认情况下会自动地去  
        * 找classes目录下面的log4j.xml文件并加载它
        */
	private static Logger log = LoggerFactory.getLogger(LoginController.class);

	@RequestMapping(value = "login")
	public ModelAndView login(HttpServletRequest request,
			HttpServletResponse response, LoginForm command) {
		String username = command.getUsername();
		ModelAndView mv = new ModelAndView("/index/index", "command",
				"LOGIN SUCCESS, " + username);
		log.info("test,test,test,123456789");
		return mv;
	}
}

LoginForm.java

public class LoginForm {
	private String username;
	private String password;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}
}

index.jsp

<html>
<body>
	<%
		request.getRequestDispatcher("/WEB-INF/jsp/login/login.jsp")
				.forward(request, response);
	%>
</body>

</html>

WEB-INF/jsp/index/index.jsp 

<%@ page language="java" contentType="text/html; charset=utf-8"
	pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>${command}
</body>
</html>

WEB-INF/jsp/index/login.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
	pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
	<div>
		<form action="login" method="get">
			<input type="text" name="username"> <input type="submit"
				value="SUBMIT">
		</form>
	</div>
</body>
</html>

 4.在这些都完成后就可以启动服务器在浏览器中访问路径，这时候可以在后台看到输出的log

[2013-03-12 02:20:53 671 INFO ] [http-80-1] zxhz.maventest.LoginController - test,test,test,123456789

并且在Tomcat安装目录下的logs目录中找到对应的mytest.log文件。

5.目录结构如下：