using xml
Mon Nov 04 2024 01:10:30 GMT+0000 (Coordinated Universal Time)
Saved by @signup1
package com.example.test;
import java.io.IOException;
import java.io.PrintWriter;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
/**
* Servlet implementation class UserServlet
*/
@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public UserServlet() {
super();
System.out.println("Servlet is Instantiated, called once in its lifetime");
}
/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
System.out.println("called once for initialization of servlet");
}
/**
* @see Servlet#destroy()
*/
public void destroy() {
System.out.println("Servlet is terminated");
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
// Retrieve form data
String name = request.getParameter("name");
String email = request.getParameter("email");
String course = request.getParameter("course");
String branch = request.getParameter("branch");
String hobbies = request.getParameter("hobbies");
// Generate HTML response
out.println("<html><body>");
out.println("<h1>Welcome, " + name + "!</h1>");
out.println("<p>Email: " + email + "</p>");
out.println("<p>Course: " + course + "</p>");
out.println("<p>Branch: " + branch + "</p>");
out.println("<p>Hobbies: " + hobbies + "</p>");
out.println("</body></html>");
}
}
//UserServlet.html
<html>
<body>
<form action="UserServlet" method="POST">
Name: <input type="text" name="name"><br>
Email: <input type="text" name="email"><br>
Course: <input type="text" name="course"><br>
Branch: <input type="text" name="branch"><br>
Hobbies: <input type="text" name="hobbies"><br>
<input type="submit" value="Submit">
</form>
</body>
</html>
// program on request parameters
package com.example.test;
import java.io.IOException;
import java.io.PrintWriter;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
/**
* Servlet implementation class VotingServlet
*/
@WebServlet("/Voting")
public class VotingServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public VotingServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
System.out.println("Init method is called");
}
/**
* @see Servlet#destroy()
*/
public void destroy() {
System.out.println("Im done with work,Destroy method is called");
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
String name=request.getParameter("Name");
String age=request.getParameter("Age");
int a=Integer.parseInt(age);
response.setContentType("text/html");
PrintWriter pw=response.getWriter();
if(a<18)
pw.println("<h1> You "+name +" are not Eligble for casting vote!! Wait upto 18 years</h1>");
else
pw.println("<h1> Congrats!!! "+name+" You are Eligble for casting vote!! </h1>");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
//VotingInterface.html
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<style>
div{
background-color:lightgreen;
color:Red;
padding:20px;
margin:20px;
border:2px yellow;
}
</style>
</head>
<body>
<div>
<h1>Checking Voting Credentials </h1>
<form action="Voting" method="get">
<label>Username :</label><input type="text" name="Name" >
<br>
<label>Age: </label><input type="text" name="Age" >
<br><input type="submit" name="submit">
</form>
</div>
</body>
</html>
// 3 . init parameters
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Login Page</title>
</head>
<body>
<h2>Login Form</h2>
<form method="POST" action="logininit">
<label for="username">Username:</label>
<input type="text" id="username" name="username"><br><br>
<label for="password">Password:</label>
<input type="password" id="password" name="password"><br><br>
<input type="submit" value="Login">
</form>
</body>
</html>
package com.example.test;
import java.io.IOException;
import java.io.PrintWriter;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
/**
* Servlet implementation class LoginServletInit
@WebServlet("/Logininit")*/
public class LoginServletInit extends HttpServlet {
private static final long serialVersionUID = 1L;
private String validUsername;
private String validPassword;
private String email;
/**
* Default constructor.
*/
public LoginServletInit() {
// TODO Auto-generated constructor stub
}
// The init method reads the init parameters defined in web.xml
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
validUsername = config.getInitParameter("username");
validPassword = config.getInitParameter("password");
email=config.getInitParameter("email");
}
// Handle POST request for login validation
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// Retrieve user input from the login form
String username = request.getParameter("username");
String password = request.getParameter("password");
// Set the response type
response.setContentType("text/html");
PrintWriter out = response.getWriter();
System.out.println("email = "+email );
// Check credentials
if (validUsername.equals(username) && validPassword.equals(password)) {
out.println("<html><body>");
out.println("<h1>Login successful! Welcome, " + username + "Your email is "+email+" </h1>");
out.println("</body></html>");
} else {
out.println("<html><body>");
out.println("<h1>Invalid credentials. Please try again.</h1>");
out.println("<a href=\"logininitparameter.html\">Go back to Login</a>");
out.println("</body></html>");
}
out.close();
}
}
//web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
<servlet>
<servlet-name>LoginServletInit</servlet-name>
<servlet-class>com.example.test.LoginServletInit</servlet-class>
<!-- Init parameters for login credentials -->
<init-param>
<param-name>username</param-name>
<param-value>ramesh</param-value>
</init-param>
<init-param>
<param-name>password</param-name>
<param-value>fattah</param-value>
</init-param>
<init-param>
<param-name>email</param-name>
<param-value>ramesh@gmail.com</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>LoginServletInit</servlet-name>
<url-pattern>/logininit</url-pattern>
</servlet-mapping>
</web-app>
TIRUNAGARI SHREYA
cse2022e
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