Popping up a dialog box on client side for authentication in a proxy server

Question

hi all,
we have wriiten a code for proxy server.now we want to add the authentication code in the same which will authenticate client by popping up a dialog box on the client side.though no code runs on the client side.only the client has to open the browser and enter the credentials.
we dont know how to pop up this authentication window on the client side when he requsts for the service.
Its almost like a SQUID where the pop up box appears.
The code for our proxy server is
import java.net.*;
import java.io.*;
public class BasicProxyServer {
     private static int serverPort;
     private static String primaryServerHost;
     private static int primaryServerPort;
     // 1st arg: port to listen on     // 2nd arg: primary server IP     // 3rd arg: primary server port
     public static void main(String [] args) {
          serverPort = Integer.parseInt(args[0]);
          primaryServerHost = args[1];
          primaryServerPort = Integer.parseInt(args[2]);
          BasicServer bserv = new BasicServer(serverPort,primaryServerHost,primaryServerPort);
class BasicServer extends Thread {
     private int serverPort;
     private String primaryHost;
     private int primaryPort;
     private ServerSocket servSock = null;
     public BasicServer(int port, String primSrv, int primPort) {
          serverPort = port;
          primaryHost = primSrv;
          primaryPort = primPort;
          start();
     public void run() {
          Socket clientSock = null;
          Socket primaryServerSock = null;
          try {
               servSock = new ServerSocket(serverPort);
          catch (IOException e) {
               e.printStackTrace();
          while(true) {
               try {
                    clientSock = servSock.accept();
                    primaryServerSock = new Socket(primaryHost, primaryPort);
                    PipedInputStream fromClient = new PipedInputStream();
//BufferedReader br= new BufferedReader(new InputStreamReader(clientSock.getInputStream()));
//String ipline=br.readLine();
//History hi=new History();
//hi.writeHistory(ipline);
//try{
//hi.getHistory();
//catch(ClassNotFoundException cne){
// System.out.println(cne);
                    PipedOutputStream toMainServer = new PipedOutputStream(fromClient);
                    PipedInputStream fromMainServer = new PipedInputStream();
                    PipedOutputStream toClient = new PipedOutputStream(fromMainServer);
                    Talk clientToMainServer = new Talk(clientSock, fromClient, primaryServerSock, toMainServer);
                    Talk mainServerToClient = new Talk(primaryServerSock, fromMainServer, clientSock, toClient);
                    clientToMainServer.start();
                    mainServerToClient.start();
               catch (IOException e) {
                    e.printStackTrace();
protected void finalize() {
if (servSock != null) {
try {
servSock.close();
} catch (IOException e) {
e.printStackTrace();
servSock = null;
class Talk extends Thread {
     private Socket incoming;
     private Socket outgoing;
     private InputStream in;
     private OutputStream out;
String urlrequest="";
     private InputStream from;
     private OutputStream to;
     Talk(Socket inSock, InputStream in, Socket outSock, OutputStream out) {
          this.in = in;
          this.out = out;
          incoming = inSock;
          outgoing = outSock;
     public void run() {
          int aByte;
          try {
               from = incoming.getInputStream();
               to = outgoing.getOutputStream();          
               while(( aByte = from.read()) != -1 ) {     //read from socket
                    out.write(aByte);
if(new Integer("3128").equals(incoming.getPort()))
urlrequest=urlrequest+out.toString();
urlrequest=urlrequest+incoming.getPort()+outgoing.getPort();
// write to pipe`
                    // read the byte from the pipe
                    to.write(in.read());          // write it to the output socket stream
                    to.flush();
System.out.println(urlrequest);
               to.close();
               from.close();
               if(incoming != null) {
                    incoming.close();
                    incoming = null;
               if(outgoing != null) {
                    outgoing.close();
                    outgoing = null;
          catch (SocketException e) {
          // there is one for a closed socket. Seems to have no effect.
          //     e.printStackTrace();
          catch (IOException e) {
               e.printStackTrace();
waiting for reply.....

Answer 1

Install a java.net.Authenticator.