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POST Request ignoring submitted data [message #1770633] Tue, 15 August 2017 10:12
Roparzh Hemon is currently offline Roparzh HemonFriend
Messages: 18
Registered: July 2017
Junior Member
I have a very basic Java EE project, consisting of one servlet Main.java and one
associated jsp file (their contents are below).

The problem I'm encountering is that, when in debugging mode I fill the fields in the form and
press the "Submit" button, I can see that the request.getParameterNames is empty, when it
should contain "left", "right", etc.

Any help appreciated.

Contents of Main.java file :

package com.miniCalculatrice.servlets;

import java.io.IOException;
import java.util.Enumeration;

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

/**
 * Servlet implementation class Main
 */
@WebServlet("/Main")
public class Main extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Main() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		this.getServletContext().getRequestDispatcher
		("/WEB-INF/main.jsp").
		forward(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		Enumeration<String> enu=request.getParameterNames();
		boolean see=enu.hasMoreElements();
		for (; enu.hasMoreElements();) {
			   String elt=enu.nextElement();
		       System.out.println(elt);
		}       
		doGet(request, response);
	}

}


Contents of main.jsp file :

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Calculatrice</title>
</head>
<body>
<p>
</p>
<form method="post" action="main" enctype="multipart/form-data">
            <input type="text" name="left" id="left" />
              <select multiple>
  								<option value="plus">+</option>
  								<option value="minus">-</option>
  								<option value="times">x</option>
  								<option value="divided">/</option>
             </select> 
            <input type="text" name="right" id="right" />
        <input type="submit" value="Calculer"/>
    </form>
</body>
</html>

Also, the web.xml file of my project is as follows :
<?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:jsp="http://java.sun.com/xml/ns/javaee/jsp" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <servlet>
    <servlet-name>Main</servlet-name>
    <servlet-class>com.miniCalculatrice.servlets.Main</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Main</servlet-name>
    <url-pattern>/main</url-pattern>
  </servlet-mapping>
</web-app>

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