log4j-1.x之三【web整合springmvc4】

绝地灬酷狼 2022-09-29 01:47 102阅读 0赞

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：

![20170313120237880][]

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>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

[20170313120237880]: /images/20220708/7d4e0eda758647b5a450ab3569ad428c.png