SendRedirect in servlet
- sendRedirect method
- Syntax of sendRedirect()
method
- Example of
RequestDispatcher interface
The sendRedirect() method of HttpServletResponseinterface
can be used to redirect response to another resource, it may be servlet, jsp or
html file.
It accepts relative as well as
absolute URL.
It works at client side because
it uses the url bar of the browser to make another request. So, it can work
inside and outside the server.
Difference between forward() and sendRedirect() method
There are many differences
between the forward() method of RequestDispatcher and sendRedirect() method of
HttpServletResponse interface. They are given below:
|
forward()
method
|
sendRedirect()
method
|
|
The
forward() method works at server side.
|
The
sendRedirect() method works at client side.
|
|
It
sends the same request and response objects to another servlet.
|
It
always sends a new request.
|
|
It
can work within the server only.
|
It
can be used within and outside the server.
|
|
Example:
request.getRequestDispacher("servlet2").forward(request,response);
|
Example:
response.sendRedirect("servlet2");
|
Syntax of sendRedirect() method
1. public void sendRedirect(String URL)throws IOException;
Example of sendRedirect() method
1. response.sendRedirect("http://www.google.com");
Full
example of sendRedirect method in servlet
|
In
this example, we are redirecting the request to the google server. Notice
that sendRedirect method works at client side, that is why we can our request
to anywhere. We can send our request within and outside the server.
|
DemoServlet.java
1. import java.io.*;
2. import javax.servlet.*;
3. import javax.servlet.http.*;
4.
5. public class DemoServlet extends HttpServlet{
6. public void doGet(HttpServletRequest req,HttpServletResponse res)
7. throws ServletException,IOException
8. {
9. res.setContentType("text/html");
10. PrintWriter pw=res.getWriter();
11.
12. response.sendRedirect("http://www.google.com");
13.
14. pw.close();
15. }}
Creating
custom google search using sendRedirect
In this example, we are using
sendRedirect method to send request to google server with the request data.
index.html
1. <!DOCTYPE html>
2. <html>
3. <head>
4. <meta charset="ISO-8859-1">
5. <title>sendRedirect example</title>
6. </head>
7. <body>
8.
9.
10. <form action="MySearcher">
11. <input type="text" name="name">
12. <input type="submit" value="Google Search">
13. </form>
14.
15. </body>
16. </html>
MySearcher.java
1. import java.io.IOException;
2. import javax.servlet.ServletException;
3. import javax.servlet.http.HttpServlet;
4. import javax.servlet.http.HttpServletRequest;
5. import javax.servlet.http.HttpServletResponse;
6.
7. public class MySearcher extends HttpServlet {
8. protected void doGet(HttpServletRequest request, HttpServletResponse response)
9. throws ServletException, IOException {
10.
11. String name=request.getParameter("name");
12. response.sendRedirect("https://www.google.co.in/#q="+name);
13. }
14. }
Output
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