Q18

Question 18

Display the pattern:

1 1 2 1 2 3 Take ‘n’ in a textbox from user. Display this pattern using Scriptlets

Created PatternServlet.java to handle the url pattern "Q18/" and render the pattern.jsp page without parameter number and created DisplayPatternServlet.java to handle url pattern "Q18/DisplayPatternServlet" and parse the user input and print the desired pattern.

Browse Code Here

Code

<%--
  Created by IntelliJ IDEA.
  User: MJK618
  Date: 23-04-2021
  Time: 16:40
  To change this template use File 
  | Settings 
  | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8"
 language="java" %>
<html>
<head>
    <link 
    <!--Bootstrap Stylling Sheet--!>
    href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">

    <title>JSP-1 Display Pattern</title>
</head>
<body>
<div style="text-align: center;">

    <div class="container-fluid">
        <h1>Display Pattern | JSP-1 </h1>

    </div>
</div>
</div>
<form method="post" action="/Q18/DisplayPatternServlet">
    <div class="form-group">
        <div class="container-fluid mt-5 ">
            <div class="row align-items-start">
                <div class="col-6">
                    <div class="container col-lg-6">
                    <div class="container mt-2">
                        <label for="n">
                        Enter the number
                        </label>
                    </div>
                    <div class="container mt-2">
                        <input 
                        type="number" 
                        class="form-control w-75 p-3"
                         id="n" 
                         name="num" 
                         placeholder="Choose a number" 
                         required>
                    </div>
                    <div class="container mt-3 mx-10">
                        <input 
                        type="submit" 
                        formmethod="post" 
                        class="btn btn-primary" 
                        value="DISPLAY">
                    </div>
                </div>
                </div>
                <div class="col-6">
                    <div class="container col-lg-6">
                    <div class="container-fluid mt-2 ">
                        <p>${pattern}</p>
                    </div>
                    </div>
                </div>
            </div>
        </div>

    </div>
</form>

<div class="card-footer mt-5 text-center">
    <div class="row align-items-start">
        <div class="col-6">
            <div class="container col-lg-6">
                <a class="btn btn-primary"  
                onclick="history.back(-1)" 
                role="button">Back</a>
            </div>

        </div>
        <div class="col-6">
            <div class="container col-lg-6">
                <a class="btn btn-primary" 
                href="http://localhost:8080/" 
                role="button">Home Page</a>
            </div>
        </div>
    </div>
</div>
</body>
</html>

Download pattern.jsp

package com.example.ITJSP;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "PatternServlet",
 value = "/PatternServlet", urlPatterns = {"/Q18"})
public class PatternServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request,
     HttpServletResponse response) throws ServletException,
      IOException {

        response.setContentType("text/html");
        getServletContext().getRequestDispatcher(
        "/pattern.jsp").forward(request,response);
    }

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


    }
}

package com.example.ITJSP;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "DisplayPatternServlet",
 value = "/DisplayPatternServlet",
  urlPatterns = {"/Q18/DisplayPatternServlet"})
public class DisplayPatternServlet extends HttpServlet {
    @Override
    protected void doGet(
    HttpServletRequest request,HttpServletResponse response)
     throws ServletException, IOException {
        getServletContext().getRequestDispatcher(
        "/pattern.jsp").forward(request,response);
    }

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

        String num_1 = request.getParameter("num");
        int n = Integer.parseInt(num_1);
        String pattern = "";
        for (int i=0; i<n; i++){
            int count = 1;
            for(int j=0; j<=i; j++) {
                pattern += count + " ";
                count += 1;
            }
            pattern += "<br>";
        }
        request.setAttribute("pattern", pattern);

        doGet(request, response);
    }
}

Output

Try or Test The Corresponding Code Here

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