log4j-1.x之三【web整合springmvc4】

最新推荐文章于 2019-08-26 10:03:59 发布

原创最新推荐文章于 2019-08-26 10:03:59 发布 · 711 阅读

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CC 4.0 BY-SA版权

本文介绍如何在Spring MVC项目中整合Log4j进行日志记录。通过配置web.xml实现日志框架的初始化，并展示了过滤器及servlet的示例代码。

java web整合spring或纯碎使用springmvc，都可以整合log4j，统一使用日志

顺便提一下，spring本身使用commons-logging(apache)，而commons-logging本身不提供日志操作，只提供调用日志框架的逻辑。。。关于logging的内容，先不赘述了

springmvc(spring)整合log4j，代码和截图如下：

代码布局如下：

下面是web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	id="WebApp_ID" version="3.1">
	<display-name>C</display-name>
	<servlet>
		<servlet-name>springmvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath*:config/app-context.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>springmvc</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
	<filter>
		<filter-name>Log4jMDCUserFilter</filter-name>
		<filter-class>filter.Log4jMDCFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>Log4jMDCUserFilter</filter-name>
		<url-pattern>*</url-pattern>
	</filter-mapping>
	<listener>
		<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
	</listener>
    <context-param>
		<param-name>log4jConfigLocation</param-name>
		<!-- 		
		    <param-value>WEB-INF/classes/config/log4j.properties</param-value>
		 -->
        <param-value>classpath:config/log4j.properties</param-value>
	</context-param>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
</web-app>

利用context-param参数，指定log4j配置文件的参数log4jConfigLocation，来动态改变配置文件位置，之前的关于log4j文章说过，在普通web中改变log4j配置文件位置时总是默认在根目录下，太麻烦了，于是spring通过监听器

Log4jConfigListener//此监听器继承ServletContextListener，这个监听器在项目启动时，在初始化filter之前先一步执行。

来实现在项目启动时，加载web.xml中参数log4jConfigLocation，初始化log4j的配置文件所在位置

下面是其他涉及代码：

filter包：

package filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.log4j.MDC;

public class Log4jMDCFilter implements Filter {


	@Override
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
			throws IOException, ServletException {

		try {
			HttpServletRequest request = (HttpServletRequest) req;
			// 获取请求路径
			String requestURL = request.getRequestURI();
			if (request.getQueryString()!=null && !request.getQueryString().equals("")) {
				requestURL = requestURL + "?" + request.getQueryString();
			}
			//request信息
			MDC.put("url", requestURL);

			HttpSession session = request.getSession();
			if (session != null) {
				//session信息
				MDC.put("userId", "你自己的session信息");
			} 
			//插入一条系统日志
			chain.doFilter(request, resp);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			MDC.clear();
		}
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}
}

servlet包：

package servlet;


import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

/**
 * Servlet implementation class C
 */
@WebServlet("/C")
public class C extends HttpServlet {
	private static final long serialVersionUID = 1L;
    private static Logger log = Logger.getLogger(C.class);
    /**
     * @see HttpServlet#HttpServlet()
     */
    public C() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		log.info("hello,world!");
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

controller里没啥东西，不贴了