从仪表板注销会导致错误404：请求的资源不可用

Question

我需要从dahboard.jsp注销并转到index.jsp，但是当我单击注销按钮时它显示如下错误消息，

HTTP状态404 - /项目/注销
类型状态报告
消息/项目/退出
描述所请求的资源（/项目/注销）不可用。
的Apache Tomcat/6.0.20

的dashboard.jsp和servlet的登录和注销在下面贴出来，什么可能是在错误。

dashboard.jsp

<div class="ends"> 
    <form action="logout" method="post" > 
     <input type="submit" value="logout"> 
    </form> 
</div> 

servlet页面登录login.java

package com.signin; 

import java.io.IOException; 
import javax.servlet.RequestDispatcher; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.http.HttpSession; 
import java.io.File; 
import java.io.IOException; 
import java.io.PrintWriter; 
import com.db.DBCon; 
/** 
* Servlet implementation class login 
*/ 
public class login extends HttpServlet { 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 

     response.setContentType("text/html"); 
     PrintWriter out = response.getWriter(); 

     String uid=request.getParameter("uid"); 
     String pwd=request.getParameter("pwd"); 


     try { 
      DBCon dbc = new DBCon(); 
      if(dbc.validateLogin(uid, pwd)) 
      { 
       HttpSession session=request.getSession(); 
       session.setAttribute("userid",uid); 

       response.sendRedirect("dashboard.jsp"); 
      } 
      else 
       out.println("<center><h3>Sign in Failed!</h3><br><a href='index.jsp'>Go to Sign up page</a></center>"); 
      dbc.closeCon(); 
     } 
     catch(Exception e){ e.printStackTrace(); } 
    } 
} 

logout.java

package com.signin; 

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

/** 
* Servlet implementation class logout 
*/ 
public class logout extends HttpServlet { 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     // TODO Auto-generated method stub 

     HttpSession session=request.getSession(); 
     session.removeAttribute("userid"); 
     session.invalidate(); 
     response.sendRedirect("index.jsp"); 
    } 

} 

Answer 1

检查您的web.xml文件是否正确映射您的注销类。问题可能在那里。否则，请分享完整的错误描述和网页。