How to read the HashMap values from servlet and display it in jsp

Question

Shooping Servlet

package com.shopping;

import java.io.IOException;
import java.util.*;

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


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        final Map<Integer,String> products= new HashMap<Integer,String>();
        products.put(1, "Motorola MotoX");
        products.put(2, "Google Pixel2");
        products.put(3, "Essential");
        products.put(4, "Iphone 6");
        request.setAttribute("product", products);
    }

}

Browse.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">
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Click on the products to add to the Cart.
<br/>
<c:forEach items="${product}" var="pro">
    ${pro.value};
    <br/>
</c:forEach>
</body>
</html>

The problem is it's not displaying map values in the jsp. it's only displaying Click on the products to add to the Cart but the valus are missing..

Please don't use [java] tag as long as problem is not demonstrable using a plain vanilla Java application class with main() method. — BalusC, Jan 20 '18 at 18:04

score -1 · Answer 1 · answered Jan 20 '18 at 14:53

You can display it on jsp page using scriptlets.

<%@ 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">
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Click on the products to add to the Cart.
<br/> <% for(String key: product.getKeys()){            out.println(product.get(key)+"<br/>");  } %>
</body>
</html>

Please catch up. Scriptlets are officially discouraged since 2003. That's 15 years ago! See also https://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files — BalusC, Jan 20 '18 at 18:03

How to read the HashMap values from servlet and display it in jsp

1 Answers1