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Web Tech Pratical

The document contains multiple Java Servlet examples demonstrating various functionalities such as printing 'Hello World', using cookies to track user visits, creating a login page, displaying today's date, and reading client request parameters. It also includes JSP examples for printing 'Hello World', creating checkboxes, performing arithmetic operations, and a KBC quiz game. Each example is structured with HTML and Java code to illustrate the use of Servlets and JSP in web applications.

Uploaded by

angelin272004
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
7 views33 pages

Web Tech Pratical

The document contains multiple Java Servlet examples demonstrating various functionalities such as printing 'Hello World', using cookies to track user visits, creating a login page, displaying today's date, and reading client request parameters. It also includes JSP examples for printing 'Hello World', creating checkboxes, performing arithmetic operations, and a KBC quiz game. Each example is structured with HTML and Java code to illustrate the use of Servlets and JSP in web applications.

Uploaded by

angelin272004
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CREATE SERVLET THAT PRINTS HELLO WORLD

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class NewServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();


out.println("<!DOCTYPE html>");

out.println("<html>");

out.println("<head>");

out.println("<title>Servlet NewServlet</title>");

out.println("</head>");

out.println("<body>");

out.println("<h1><center>SERVLET PROGRAM TO PRINT </center></h1>");


out.println("<h1><center>HELLO WORLD </center></h1>");

out.println("</body>");

out.println("</html>");

}
OUTPUT:
CREATE SERVLET THAT USES COOKIES TO STORE THE NUMBER

OF TIMES A USER HAS VISITED THE SERVLET

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet(name = "NewServlet", urlPatterns = "/NewServlet")
public class NewServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Cookie[] cookies = request.getCookies();
Cookie visitCookie = null;
for (Cookie cookie : cookies != null ? cookies : new Cookie[0]) {
if (cookie.getName().equals("visitCount")) {
visitCookie = cookie;
break;
}
}
int visitCount = (visitCookie != null) ? Integer.parseInt(visitCookie.getValue()) + 1 : 1;
visitCookie = (visitCookie != null) ? visitCookie : new Cookie("visitCount",
String.valueOf(visitCount));
visitCookie.setValue(String.valueOf(visitCount));
visitCookie.setMaxAge(60 * 60 * 24 * 365);
response.addCookie(visitCookie);
response.setContentType("text/html");
response.getWriter().println("<h1>You have visited this page " + visitCount + "
times.</h1>");
}
}
OUTPUT:
LOGIN PAGE USING SERVLET

Index.html:

<html>

<head>

<title>LOGIN</title>

<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">

</head>

<body><center><h1>LOGIN PAGE USING SERVLET</h1>

<form action="http://localhost:8080/WebApplication2/NewServlet">
Enter userId<input type="text" name="txtId"><br><br>

Enter Password<input type="password" name="txtPass"><br><br>

<input type="Reset">
<input type="submit" value="click to login">

</form></center>

</body>

</html>

NewServlet.java:

import java.io.IOException;

import java.io.PrintWriter;
import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class NewServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)


throws ServletException, IOException {
response.setContentType("text/html");

PrintWriter pw = response.getWriter();

pw.println("<!DOCTYPE html>");

pw.println("<html>");
pw.println("<head>");

pw.println("<title>Servlet Login</title>");

pw.println("</head>");

pw.println("<body bgcolor='white'>");

String uname = request.getParameter("txtId");

String upass = request.getParameter("txtPass");

if (uname == null || upass == null) {


pw.println("<h1><center> provide both username and password.</center></h1>");
} else {

if (uname.equals("Swetha") && upass.equals("12345")) {

pw.println("<h1><center>HELLO! " + uname + "</center></h1>");

} else if (uname.equals("Anna") && upass.equals("123")) {

pw.println("<h1><center>Welcome " + uname + "</center></h1>");

} else {

pw.println("<h1><center>Login failed!</center></h1>");
}

pw.println("</body>");

pw.println("</html>");

}
OUTPUT:
SERVLET PROGRAM TO PRINT TODAY’S DATE

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class NewServlet extends HttpServlet
{
protected void doGet(HttpServletRequest request, HttpServletResponse response)throws
ServletException, IOException
{
PrintWriter pw = response.getWriter();
Date today = new Date();
pw.println("<html>");
pw.println("<body bgcolor='pink'>");
pw.println("<title> Todays date </title>");
pw.println("<h1><center>SERVLET PROGRAM TO PRINT TODAY'S
DATE</center></h1>");
pw.println("<h2><center>" + today + "</center></h2></html>");
}
}
OUTPUT:
SIMPLE SERVLET

NewServlet.java:

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class NewServlet extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)


throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");

try (PrintWriter out = response.getWriter()) {


out.println("<!DOCTYPE html>");

out.println("<html>");

out.println("<head>");

out.println("<title>Servlet NewServlet</title>");

out.println("</head>");

out.println("<body>");

out.println("<h1>Servlet NewServlet at " + request.getContextPath() + "</h1>");

out.println("</body>");
out.println("</html>");

}
OUTPUT:
SERVLET PROGRAM TO READ THE CLIENT REQUEST
PARAMETERS

Index.html:
<!DOCTYPE html>

<html>

<head>

<title>Servlet Request Example</title>

</head>

<body>

<h2>Enter Your Details</h2>


<form action="RequestServlet" method="post">

Name: <input type="text" name="username"><br><br>

Email: <input type="email" name="email"><br><br>

<input type="submit" value="Submit">

</form>

</body>

</html>

RequestServlet.java:

import java.io.IOException;

import java.io.PrintWriter;

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(name = "RequestServlet", urlPatterns = {"/RequestServlet"})


public class RequestServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {


// Redirect GET requests to index.html

response.sendRedirect("index.html");

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

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

// Read form parameters

String name = request.getParameter("username");

String email = request.getParameter("email");

// Display response

out.println("<html><body>");
out.println("<h2>Received Data</h2>");

out.println("Name: " + name + "<br>");

out.println("Email: " + email + "<br>");

out.println("</body></html>");

}
OUTPUT:
SERVLET PROGRAM TO DISPLAY COOKIE ID

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class CookieServlet extends HttpServlet {

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

response.setContentType("text/html");

PrintWriter out = response.getWriter();

Cookie[] cookies = request.getCookies();

out.println("<html><body>");
out.println("<h2>Cookie ID Display</h2>");

if (cookies != null) {
boolean found = false;
for (Cookie cookie : cookies) {
if (cookie.getName().equals("cookieID")) {
out.println("<p>Cookie ID: " + cookie.getValue() + "</p>");
found = true;
break;
}
}

if (!found) {
out.println("<p>No 'cookieID' cookie found.</p>");
}
} else {
out.println("<p>No cookies present.</p>");
}
out.println("</body></html>");
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response); // For simplicity, reuse the GET logic
}
}
OUTPUT:
SERVLET PROGRAM TO GENERATE PLAIN TEXT

import java.io.*;

import javax.servlet.*;

import javax.servlet.annotation.*;

import javax.servlet.http.*;

@WebServlet("/hello")

public class HelloWorldServlet extends HttpServlet {


@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws


ServletException, IOException {

response.setContentType("text/plain");

PrintWriter out = response.getWriter();

out.println("Hello, World!");

}
OUTPUT :-
JSP PROGRAM TO PRINT HELLO WORLD

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<title>JSP Page</title>

</head>

<body bgcolor="pink">
<%out.println("<h1><center>JSP PROGRAM TO PRINT HELLO
WORLD</center><h1>");%>

<%out.println("<h1><center>HELLO WORLD!</center></h1>");%>

</body>

</html>
OUTPUT :-
JSP PROGRAM TO CREATE CHECK BOXES

<%@ page contentType="text/html; charset=ISO-8859-1" language="java" %>

<html>

<head>

<title>Checkbox</title>

</head>

<body>

<h2>Choose Your Favorite Fruits</h2>

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

<label>

<input type="checkbox" name="fruit" value="Apple"> Apple

</label><br>

<label>

<input type="checkbox" name="fruit" value="Banana"> Banana

</label><br>

<label>

<input type="checkbox" name="fruit" value="Orange"> Orange

</label><br>

<label>

<input type="checkbox" name="fruit" value="Grapes"> Grapes

</label><br>

<label>

<input type="checkbox" name="fruit" value="Mango"> Mango

</label><br><br>

<input type="submit" value="Submit">

</form>
<%

String[] selectedFruits = request.getParameterValues("fruit");

if (selectedFruits != null) { out.println("<h3>You have

selected:</h3>"); for (String fruit : selectedFruits) {

out.println(fruit + "<br>");

%>

</body>

</html>
OUTPUT :-
JSP PROGRAM TO PERFORM BASIC ARITHMETIC FUNCTIONS

arithmetric.jsp

<html>
<head>
<title>Arithmetic functions</title>

<h1><center> Arithmetic Functions</center></h1>


</head>
<body>
<center>
<form action="Calc.jsp" method="get">
<label for="num1"><b>Number 1</b></label>
<input type="text" name="num1"><br><br>

<label for="num2"><b>Number 2</b></label>


<input type="text" name="num2"><br><br>

<input type="checkbox" name="operations" value="Add"> Addition <br>


<input type="checkbox" name="operations" value="Sub"> Subtraction <br>
<input type="checkbox" name="operations" value="Mul"> Multiplication <br>
<input type="checkbox" name="operations" value="Div"> Division <br><br>

<input type="submit" value="Submit">


</form>
</center>
</body>
</html>
Calc.jsp

<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-


8"%>
<!DOCTYPE html>
<html>
<head>
<title>Arithmetic Functions</title>

</head>
<body>
<%
try {
double num1 = Double.parseDouble(request.getParameter("num1"));
double num2 = Double.parseDouble(request.getParameter("num2"));
String[] operations = request.getParameterValues("operations");

if (operations != null) {
for (String operation : operations) {

double result = 0;
String message = "";
if (operation.equals("Add")) {
result = num1 + num2;
message = "Addition of two numbers: ";
} else if (operation.equals("Sub")) {
result = num1 - num2;
message = "Subtraction of two numbers: ";
} else if (operation.equals("Mul")) {
result = num1 * num2;
message = "Multiplication of two numbers: ";
} else if (operation.equals("Div")) {
if (num2 == 0) {
message = "Error: Division by zero is not allowed.";
} else {
result = num1 / num2;
message = "Division of two numbers: ";
}

}
out.println(message + result + "<br>");
}
} else {
out.println("No operations selected.");
}
} catch (NumberFormatException e) {
out.println("Error: Invalid input. Please enter valid numbers.");
}
%>

</body>
</html>
OUTPUT :-
KBC CREATE THE SERVLET FOR DEMO OF KBC GAME

newjsp.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-
8"%>

<!DOCTYPE html>

<html>

<head>

<title>KBC Quiz</title>

</head>

<body>
<h2>Kaun Banega Crorepati Quiz</h2>

<%

String[] questions = {"What is the capital of India?", "Who wrote 'Hamlet'?", "What is
the square root of 64?"};

String[][] options = {{"Mumbai", "Delhi", "Kolkata", "Chennai"}, {"Shakespeare",


"Milton", "Wordsworth", "Keats"}, {"6", "7", "8", "9"}};

int[] answers = {1, 0, 2};

if (request.getMethod().equalsIgnoreCase("POST")) {

int score = 0;

for (int i = 0; i < questions.length; i++) {


String answer = request.getParameter("q" + i);
if (answer != null && Integer.parseInt(answer) == answers[i]) {

score++;

out.println("<h3>Your Score: " + score + " out of " + questions.length + "</h3>");

out.println("<a href='http://localhost:8080/WebApplication5/newjsp.jsp'>Play
Again</a>");
} else {

%>

<form method="post">

<% for (int i = 0; i < questions.length; i++) { %>


<p><%= questions[i] %></p>

<% for (int j = 0; j < options[i].length; j++) { %>

<input type="radio" name="q<%= i %>" value="<%= j %>"> <%= options[i][j]


%><br>

<% } %>

<% } %>

<br>

<input type="submit" value="Submit">

</form>

<% } %>
</body>

</html>
OUTPUT:

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