關於servlet的日誌配置

Question

我正在開發一個應用程序，我想配置log4j，因爲我想爲我的項目完成單獨的日誌記錄，以便創建單獨的日誌文件..下面是我的項目的圖片點擊鏈接直接看到它.. snapshot of the project structure 現在，這裏是servlet

package com.saral; 

import java.io.IOException; 
import org.apache.log4j.Logger; 
import org.apache.log4j.PropertyConfigurator; 
import java.io.PrintWriter; 

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 javax.servlet.http.HttpSession; 

/** 
* Servlet implementation class First 
*/ 
//@WebServlet("/First") 
public class MyServlet extends HttpServlet 
{ 
    private static final long serialVersionUID = 1L; 
    static final Logger logger = Logger.getLogger(MyServlet.class); 


    /** 
    * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 
    */ 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     PropertyConfigurator.configure("log4j.properties"); 
     logger.info("before---->"); 

     // TODO Auto-generated method stub 
     String name=request.getParameter("txtName"); 
     response.setContentType("text/html"); 
     PrintWriter out=response.getWriter(); 
     out.println("Hello,"+name); 
     out.println("<br> this output is generated by a simple servlet."); 
     out.println("Total Number of users logged in--->"+request.getSession().getServletContext().getAttribute("sessionCount")); 
     out.close(); 
}} 

和web.xml中的結構是

<?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" id="WebApp_ID" version="3.0"> 
    <display-name>FirstDemo</display-name> 



    <servlet> 
    <servlet-name>hello</servlet-name> 
    <servlet-class>com.saral.MyServlet</servlet-class> 
    </servlet> 
    <servlet-mapping> 
    <servlet-name>hello</servlet-name> 
    <url-pattern>/helloServlet</url-pattern> 
    </servlet-mapping> 
    <welcome-file-list> 
    <welcome-file>home.html</welcome-file> 
    </welcome-file-list> 


    <listener> 
    <listener-class>com.saral.SessionCounter</listener-class> 
</listener> 

</web-app> 

但在Tomcat上運行的應用程序它顯示了以下錯誤..

 INFO: Server startup in 888 ms 
log4j:ERROR Could not read configuration file [log4j.properties]. 
java.io.FileNotFoundException: log4j.properties (The system cannot find the file specified) 
    at java.io.FileInputStream.open(Native Method) 
    at java.io.FileInputStream.<init>(Unknown Source) 
    at java.io.FileInputStream.<init>(Unknown Source) 
    at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:306) 
    at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:324) 
    at com.saral.MyServlet.doGet(MyServlet.java:29) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 
log4j:ERROR Ignoring configuration file [log4j.properties]. 

請指教如何生成單獨的日誌，請大家指教

Answer 1

這意味着log4j.properties文件是不是在你的類路徑中。您需要將其放在「src」文件夾下，然後將應用程序重新部署到tomcat。