Create an application to display current date and time in apache tomcat server

Sandeep Verma — Sun, 08 Dec 2019 14:06:53 +0000

Here is the code to display current date and time in the apache tomcat server.

Create a landing page.

Index.html





Practical Work




  
 


2. To show the current date and time, use Java date object in a JSP page.
Perform_Something.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1" import="java.util.Date"%>




Insert title here


<%
Date da = new Date();

%>
Date:<%= da.toLocaleString() %>


Output:

Create an application with two textboxes username and password on receiving the request to the user details and display welcome username on another page

Sandeep Verma — Sun, 08 Dec 2019 13:55:58 +0000

In this article, we’re going to look at a basic login verification form using JSP and servlet. If a user’s entered username and password matches with original username and password then ‘welcome’ page would open.

Here’s the code with two textboxes username and password on receiving the request to verify the user details and display welcome username on another page.

1.Make a landing page in JSP where two text boxes and a submit button will be displayed.

index.jsp

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




Practical Work


<% 
String msg = (String) request.getAttribute("message"); 
if(msg==null)
  out.println("\t");
else
out.println(msg);
%>

Username :  
Password :

2. Now, it’s time to verify the user which would be done by servlet at backend.

login.java

package com.programmerbay;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class login extends HttpServlet{
  public void service(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException
  {
    
  String username = request.getParameter("username")	;
  String password = request.getParameter("pass")	;
    if(username.equals("programmerbay") && password.equals("12345"))
  {
HttpSession session = request.getSession();
session.setAttribute("username", username);
  response.sendRedirect("home.jsp");
  }
  else
  {
    String msg;
    if(username.isEmpty() || password.isEmpty())
    msg ="Fields are  empty";
    else
    msg ="Password is incorrect!!";
    request.setAttribute("message", msg);
        
    RequestDispatcher redirect = request.getRequestDispatcher("index.jsp");
    redirect.forward(request,response);
  }
  }

}

3. If a user type in correct username and password, ‘welcome’ page would be displayed.

Home.jsp

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




Home


<%
String username = (String)session.getAttribute("username");
if(username==null)
{
  response.sendRedirect("index.html");
}
%>

This is home Screen

4. To end the session, a logout servlet will work whenever a user clicks on the logout button.

logout.java

package com.programmerbay;

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;
import javax.servlet.http.HttpSession;

public class logout extends HttpServlet{
  public void service(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException
  {
    HttpSession session = request.getSession();
    session.removeAttribute("username");
    session.invalidate();
    response.sendRedirect("index.jsp");
  }
}

Output:

When either username or password is not entered

When a user enters a wrong password or username

Homepage

Create an application to display addition and product of two numbers on the client side using JSP

Sandeep Verma — Sat, 07 Dec 2019 15:21:11 +0000

Simple code to display addition and product of two numbers using JSP.
1) Create a landing page in HTML.
Index.html





Practical Work



First number 
  


  Second number

2) Make a module in JSP that will print the sum and product of two numbers
add_multiply.jsp

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




Insert title here


<%
int num1 = Integer.parseInt(request.getParameter("num1"));
int num2 = Integer.parseInt(request.getParameter("num2"));
int sum = num1 + num2;
int product = num1 * num2;
out.println("This is the sum = "+sum+"\n This is the product = "+product);
%>

Output:

jsp – Programmerbay

Create an application to display current date and time in apache tomcat server

Create an application with two textboxes username and password on receiving the request to the user details and display welcome username on another page

This is home Screen

Create an application to display addition and product of two numbers on the client side using JSP