What is meant by sendRedirect and example?
>> Friday, June 10, 2011
Send Redirect: When we want that someone else should handle the response of our servlet,
then there we should use sendRedirect() method.
In send Redirect whenever the client makes any request it goes to the container,
there the container decides whether the concerned servlet can handle the request or not.
If not then the servlet decides that the request can be handle by other servlet or jsp.
Then the servlet calls the sendRedirect() method of the response object and sends back the response to the browser along with the status code.
Then the browser sees the status code and look for that servlet which can now handle the request.
Again the browser makes a new request, but with the name of that servlet which can now handle the request,
and the result will be displayed to you by the browser. In all this process the client is unaware of the processing.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Redirecting the page</title>
</head>
<body>
<form action = "/ServletProject/SendRedirect" method = "post">
<tr>
<td>Enter your name :</td>
<td><input type = "text" name = "username"></td>
</tr><br>
<tr>
<td>Enter your password :</td>
<td><input type = "password" name = "password"></td>
</tr><br>
<tr>
<td><input type = "submit" name = "submit"></td>
</tr>
</form>
</body>
</html>
SendRedirct.class
then there we should use sendRedirect() method.
In send Redirect whenever the client makes any request it goes to the container,
there the container decides whether the concerned servlet can handle the request or not.
If not then the servlet decides that the request can be handle by other servlet or jsp.
Then the servlet calls the sendRedirect() method of the response object and sends back the response to the browser along with the status code.
Then the browser sees the status code and look for that servlet which can now handle the request.
Again the browser makes a new request, but with the name of that servlet which can now handle the request,
and the result will be displayed to you by the browser. In all this process the client is unaware of the processing.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Redirecting the page</title>
</head>
<body>
<form action = "/ServletProject/SendRedirect" method = "post">
<tr>
<td>Enter your name :</td>
<td><input type = "text" name = "username"></td>
</tr><br>
<tr>
<td>Enter your password :</td>
<td><input type = "password" name = "password"></td>
</tr><br>
<tr>
<td><input type = "submit" name = "submit"></td>
</tr>
</form>
</body>
</html>
SendRedirct.class
import java.io.*;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SendRedirect extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
public SendRedirect() {
super();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
String name = request.getParameter("username");
String password = request.getParameter("password");
if(name.equals("James")&& password.equals("abc"))
{
response.sendRedirect("/ServletProject/ValidUser");
}
else
{
pw.println("u r not a valid user");
}
}
}
validuser.classimport java.io.*;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class for Servlet: ValidUser
*
*/
public class ValidUser extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
/* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#HttpServlet()
*/
public ValidUser() {
super();
}
/* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
// TODO Auto-generated method stub
}
/* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter pw = response.getWriter();
pw.println("Welcome to roseindia.net
");
pw.println("how are you");
}
}
