log4j-1.x之三【web整合springmvc4】

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