Skip to main content

How to redirect from Servlet to Jsp or Servlet to Servlet.JSP Navigation



How we can redirect from Servlet to Jsp or Servlet to Servlet :-
1) using response.sendRedirct()
     It will complete roundtrip from server to client then the client to the server means if we will redirect to the JSP page then the response will be submitted to the browser then the browser will navigate the content into different web pages.
Steps to implement it:-
1)  create a JSP Web page and name it home.jsp and Write 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>
<form action="Helloser" method="post">
<input type="submit" value="NEXT" />
</form>
</body>
</html>
2)   Create Servlet and name it Helloser
package scs;
import java.io.IOException;
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 Helloser
 */
@WebServlet("/Helloser")
public class Helloser extends HttpServlet {
private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Helloser() {
        super();
        // TODO Auto-generated constructor stub
    }

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.sendRedirect("page3.jsp");
}
}
3)  create page3.jsp
<%@ 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>
<%
int a,b,c;
a=1000;
b=2000;
c=a+b;
out.println("Result is " + c);
%>
</body>
</html>
note:-  when we click on the button then JSP will navigate to servlet and the servlet will navigate to again the JSP Web page. URL will change because of response.sendRedirect() will complete roundtrip for navigation.
2) using Request Dispatcher Interface using forward and include
  It will not complete a round trip means Request-dispatcher will directly send a request to another web page from a web server using the forward and include method hence we can not manage session and cookie using Request-dispatcher object.
1)  forward():-   We can directly send the request from the servlet class to JSP web content from Web Server, the URL will not be changed because page redirection will be managed by Server.
2)  include():-   We can include the content of the web page to servlet class means it will display combined result means the result of servlet and JSP page both will be displayed using response object.
Code of Servlet:
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;
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        response.setContentType("text/html");
        out.write("Servlet");
        RequestDispatcher req =  request.getRequestDispatcher("ArrExample.jsp");
        req.include(request, response);
        //req.forward(request, response);
       // response.sendRedirect("ArrExample.jsp");
        //out.print(out);
    }
}
3)  using JavaScript:-  we can write Javascript code to implement redirection from one web page to another under a web browser.
We will write 
<script>
window.location='jsppage or servlet url';
</script>



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