Skip to main content

Another Example of JSP to Servlet using response.sendRedirect()

1)  Create Web Page using JSP
In this example, I will explain navigation from JSP to servlet and servlet to JSP.
form tag of Html has action attribute to navigate from JSP to servlet when we click on the Submit button.
but if we want to navigate from servlet to the JSP web page then we use response.sendRedirect() for servlet navigation.
the response is the object of HttpServletResponse class and sendRedirect() is used to0 send the complete page content to the Web browser.
Syntax of response.sendRedirect():-
response.sendRedirect("url")    // direct url
response.sendRedirect("url?args="+value)   #url with parameter
response.sendRedirect("url?args="+value+"&args1"+value1+"&args2"+value2)  #url with multiple parameter
Step1st:-  Create a JSP web page with the following code:-
<%@ 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">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body bgcolor="cyan">
<center>
<h1>Addition Program </h1>
<form action="Addser" method="post">
<input type="text" name="txtnum1" placeholder="Enter First Number" />
<br>
<br>
<input type="text" name="txtnum2" placeholder="Enter Second Number" />
<br>
<br>
<input type="submit" name="btnsubmit" value="Click"  />
</form>
</center>
Step2nd:-  Create Servlet and named Addser and Write the following code:-
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;
/**
 * Servlet implementation class Addser
 */
@WebServlet("/Addser")
public class Addser extends HttpServlet {
private static final long serialVersionUID = 1L;
         
    public Addser() {
        super();
        // TODO Auto-generated constructor stub
    }
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//PrintWriter out = response.getWriter();
int a = Integer.parseInt(request.getParameter("txtnum1"));
int b = Integer.parseInt(request.getParameter("txtnum2"));
int c = a+b;
response.sendRedirect("additionexample.jsp?q="+c);
//out.print(c);
}
}
Step3rrd append this code on the JSP web page:-
<%
if(request.getParameter("q")!=null)
{
out.print("result is "+request.getParameter("q"));
}
%>

     
Another example of JSP Servlet to show data on text field:-
1)  Create a JSP Web page:-
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="AdditionServlet" method="post">
            <h1>Addition Form</h1>
            <hr>
            <input type="text" name="txtnum1" placeholder="Enter First Number" value="<% if(request.getParameter("q1")!=null)
         {
             out.print(request.getParameter("q1"));
         }  %>" /><br><br>
            <input type="text" name="txtnum2" placeholder="Enter Second Number" value="<% if(request.getParameter("q2")!=null)
         {
             out.print(request.getParameter("q2"));
         }  %>"/><br><br><br>
            <input type="submit" name="btnsubmit" value="Click" />
            <br><br>                 
        </form>
        <%
         if(request.getParameter("q")!=null)
         {
             out.print(request.getParameter("q"));
         }                
       
       %>           
    </body>       
                  
</html>

2)   Create Servlet and named it AdditionServlet:-
import java.io.IOException;
import java.io.PrintStream;
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 AdditionServlet extends HttpServlet {  
    protected void doPostt(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {     
        PrintWriter out = response.getWriter();
        int num1 =  Integer.parseInt(request.getParameter("txtnum1"));
        int num2 =  Integer.parseInt(request.getParameter("txtnum2"));
        int num3 = num1+num2;
      //  out.write("result is "+num3);
        response.sendRedirect("index.jsp?q="+num3+"&q1="+num1+"&q2="+num2);
           
    }     
}

Labels:

Comments

Post a Comment

POST Answer of Questions and ASK to Doubt

Popular posts from this blog

Uncontrolled form input in React-JS

  Uncontrolled form input in React-JS? If we want to take input from users without any separate event handling then we can uncontrolled the data binding technique. The uncontrolled input is similar to the traditional HTML form inputs. The DOM itself handles the form data. Here, the HTML elements maintain their own state that will be updated when the input value changes. To write an uncontrolled component, you need to use a ref to get form values from the DOM. In other words, there is no need to write an event handler for every state update. You can use a ref to access the input field value of the form from the DOM. Example of Uncontrolled Form Input:- import React from "react" ; export class Info extends React . Component {     constructor ( props )     {         super ( props );         this . fun = this . fun . bind ( this ); //event method binding         this . input = React . createRef ();...
Post a Comment
Read more

JSP Page design using Internal CSS

  JSP is used to design the user interface of an application, CSS is used to provide set of properties. Jsp provide proper page template to create user interface of dynamic web application. We can write CSS using three different ways 1)  inline CSS:-   we will write CSS tag under HTML elements <div style="width:200px; height:100px; background-color:green;"></div> 2)  Internal CSS:-  we will write CSS under <style> block. <style type="text/css"> #abc { width:200px;  height:100px;  background-color:green; } </style> <div id="abc"></div> 3) External CSS:-  we will write CSS to create a separate file and link it into HTML Web pages. create a separate file and named it style.css #abc { width:200px;  height:100px;  background-color:green; } go into Jsp page and link style.css <link href="style.css"  type="text/css" rel="stylesheet"   /> <div id="abc"> </div> Exam...
Post a Comment
Read more

JDBC using JSP and Servlet

JDBC means Java Database Connectivity ,It is intermediates from Application to database. JDBC has different type of divers and provides to communicate from database server. JDBC contain four different type of approach to communicate with Database Type 1:- JDBC-ODBC Driver Type2:- JDBC Vendor specific Type3 :- JDBC Network Specific Type4:- JDBC Client-Server based Driver  or JAVA thin driver:- Mostly we prefer Type 4 type of Driver to communicate with database server. Step for JDBC:- 1  Create Database using MYSQL ,ORACLE ,MS-SQL or any other database 2   Create Table using database server 3   Create Form according to database table 4  Submit Form and get form data into servlet 5  write JDBC Code:-     5.1)   import package    import java.sql.*     5.2)  Add JDBC Driver according to database ide tools     5.3)  call driver in program         ...
4 comments
Read more