Redirect The Page Randomly

In this section we will discuss how a page can be redirected randomly.

Redirect The Page Randomly

In this section we will discuss how a page can be redirected randomly.

To solve the above task I used the random method of the class Math. This method generates +ve double value number greater than or equal to 0.0 and less than 1.0. In the example at first I created a list of pages which I have to redirected further set the status and header of the redirected page.

Example :

RandomRedirectServlet.java

import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RandomRedirectServlet extends HttpServlet
{
List l= new ArrayList();
public void init()
{
l.add("http://www.Devmanuals.com");
l.add("http://www.facebook.com");
l.add("http://www.Google.com");
l.add("http://www.rediffmail.com");
l.add("http://www.gmail.com");
}
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException
{
res.setContentType("text/html");
Random rndm = new Random();
int listIndex = ((int)(Math.random()*l.size()));
String site = (String)l.get(listIndex);
res.setStatus(res.SC_MOVED_TEMPORARILY);
res.setHeader("Location", site);
}
}

web.xml

<web-app>
<display-name>SendRedirectExample</display-name>
<servlet>
<servlet-name>RandomRedirectServlet</servlet-name>
<servlet-class>RandomRedirectServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RandomRedirectServlet</servlet-name>
<url-pattern>/RandomRedirectServlet</url-pattern>
</servlet-mapping>
</web-app>

Output :

When you will execute this example you will get that every time a new web page is opened which are listed in the above example.

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