java left logo
java middle logo
java right logo
 

Home arrow Java EE Tips
 
 
Main Menu
Home
Java Tutorials
Book Reviews
Java SE Tips
Java ME Tips
Java EE Tips
Other API Tips
Java Applications
Java Libraries
Java Games
Java Network
Java Forums
Java Blog




Most Visited Tips
Java SE Tips
Java ME Tips
Java EE Tips
Other API Tips
Java Applications
Java Libraries
Java Games
Book Reviews
Top Rated Tips
Java SE Tips
Java ME Tips
Java EE Tips
Other API Tips
Java Applications
Java Libraries
Java Games
Book Reviews


Statistics
Registered Users: 4092
Java SE Tips: 614
Java ME Tips: 202
Java EE Tips: 183
Other API Tips: 779
Java Applications: 298
Java Libraries: 209
Java Games: 16
Book Reviews:
 
 
 
How to get information about the client machine using Servlet E-mail
User Rating: / 35
PoorBest 

A servlet can use getRemoteAddr() and getRemoteHost() to retrieve the IP Address and host of the client machine respectively:

  public String ServletRequest.getRemoteAddr()
  public Stirng ServletRequest.getRemoteHost()

Using these functions access to specific client host can be restricted. The sample code below checks the client specification at the server and send the relevant message to the client.

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class DemoExportRestriction extends HttpServlet{

    public void doGet(HttpServletRequest req,HttpServletResponse res)
            throws ServletException,IOException{
        
        res.setContentType("text/plain");
        PrintWriter out= res.getWriter();
        
        //Getting the client's hostname
        String remoteHost = req.getRemoteHost();
        
        //See if the client is allowed
        if(!isHostAllowed(remoteHost)){
            out.println("Access <BLINK>ACCESS DENIED </BLINK>");
        else{
            out.println("access granted");
        }
    }
    private boolean isHostAllowed(String host) {
        return(host.endsWith(".com"))||
                (host.indexOf('.')==-1);//no domain , assume OK
    }
}

 Related Tips

 
< Prev   Next >

Page 1 of 0 ( 0 comments )

You can share your information about this topic using the form below!

Please do not post your questions with this form! Thanks.


Name (required)


E-Mail (required)

Your email will not be displayed on the site - only to our administrator
Homepage(optional)



Comment Enable HTML code : Yes No



 
       
         
     
 
 
 
   
 
 
java bottom left
java bottom middle
java bottom right
RSS 0.91 FeedRSS 1.0 FeedRSS 2.0 FeedATOM FeedOPML Feed

Home - About Us - Privacy Policy
Copyright 2005 - 2008 www.java-tips.org
Java is a trademark of Sun Microsystems, Inc.