JSP page not working in Servlet Program

StackOverflow https://stackoverflow.com/questions/19408937

Question

Actually i'm trying to display the details obtained from JSP form with servlet. But I'm not able to display the JSP page. But I can see the program entering into the POST method in Servlet.

Here is my code,

Startup.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
 <form action="controlServlets" method="post">
        <input type="text" name="name"/><br>        
        <input type="text" name="group"/>
        <input type="text" name="pass"/>
        <input type="submit" value="submit">            
    </form>

</body>
</html>

web.xml

<web-app>

  <servlet>
    <servlet-name>controlServlets</servlet-name>
    <servlet-class>com.selenium8x8.servlet.ControlServlets</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>controlServlets</servlet-name>
    <url-pattern>/*</url-pattern>
  </servlet-mapping>

</web-app>

ControlServlets.java

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/ControlServlets")
public class ControlServlets extends HttpServlet {
    private static final long serialVersionUID = 1L;


    public ControlServlets() {
        super();
        // TODO Auto-generated constructor stub
    }


//    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doPost(request,response);  
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

            String name = request.getParameter("name");
            String group = request.getParameter("group");
            String pass = request.getParameter("pass");
            System.out.println("Name :"+ name);
            System.out.println("group :"+ group);
            System.out.println("pass :"+ pass);
            System.out.println("Post method");
    }

}

In console,

I can see the following,

Name :null
group :null
pass :null
Post method

Please Help...

Was it helpful?

Solution

Part I)If you want to use web.xml for your application then you need to make following changes :

1)In Startup.jsp change the action attribute of <form> tag to 

<form action="ControlServlets" method="post"> 
              ↑

2)In web.xml change the <servlet-mapping> to 

<servlet-mapping>
 <servlet-name>controlServlets</servlet-name>
 <url-pattern>/ControlServlets</url-pattern> 
</servlet-mapping>

3)In ControlServlets.java several changes as, in web.xml you mentioned 

<servlet-class>com.selenium8x8.servlet.ControlServlets</servlet-class>
                ↑

This is the package name, so you must have first statement in ControlServlets.java 

package com.selenium8x8.servlet;  //in your code it is missing

Then, comment following two lines 

//import javax.servlet.annotation.WebServlet;

and 

//@WebServlet("/ControlServlets")

Now, run application, it will give you desired output.

Part II) If you want to use @WebServlet annotation, as you did

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

@WebServlet("/ControlServlets")
public class ControlServlets extends HttpServlet {   
  ...
  .....
  .......
}

Then, no need for web.xml. The above does basically the same as following: 

<servlet>
 <servlet-name>controlServlets</servlet-name>
 <servlet-class>com.selenium8x8.servlet.ControlServlets</servlet-class>
</servlet>
<servlet-mapping>
 <servlet-name>controlServlets</servlet-name>
 <url-pattern>/ControlServlets</url-pattern>
</servlet-mapping>

For using @WebServlet annotation you need Java EE 6 / Servlet 3.0

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