Displaying text in local web browser

Question

Hi,
Been looking at a web forwarding program that accepts a GET request from a browser and goes off and gets the page from the remote server and then needs to feed that page back to the browser. I've got as far as getting the page back from the remote site but was wondering how to post it back on the web page.
import java.io.*;
import java.net.*;
public class WebFwd{
    private int fwdPort;
    private ServerSocket listener = null;
    private Socket socket;
    private String remoteURL;
    private int browserPort;
     public WebFwd(int i){ //Constructor to create an instance
          fwdPort = i;
          listenSocket();
     public void listenSocket(){
          try{
                listener = new ServerSocket(fwdPort);
                System.out.println("Server socket up and running on port " + fwdPort);
           catch (IOException e){
                System.out.println("Could not listen on port "+ fwdPort + ".");
                System.exit(-1);
          while(true){
               try{
                    //listener.accept returns a client connection.
                    socket = listener.accept();
                    browserPort = socket.getPort();
                    DataInputStream dis = new DataInputStream(socket.getInputStream());
                    byte [] data = new byte[1024];
                    dis.read(data, 0, data.length); //read in the data from the browser to the socket
                    String byteStr = new String(data); //convert the byte array to a string
                    System.out.println(byteStr.trim()); //print out the contents of the GET request trimming the whitespace
                    parseString(byteStr); //cut up the GET request to obtain destination
               catch (IOException e){
                    System.out.println("Accept failed: "+ fwdPort + ".");
                    System.exit(-1);
      * Get the remote location of web page
     private void parseString(String get){
          String [] getArr = get.split("/");
          String [] getArr2 = getArr[1].split(" ");
          remoteURL = "http://" + getArr2[0];
          forwardRequest();
      * Forwards request to the remote location
     private void forwardRequest(){
          try{
               URL u = new URL(remoteURL); //create a new URL to remote location
               InputStream is = u.openStream(); //open a stream on that url
               //create new dis to read the data from the remote server
               DataInputStream di = new DataInputStream(new BufferedInputStream(is));
               String s;
               //while there is stil something to read, read it
               while ((s = di.readLine()) != null){
                      System.out.println(s); //prints contents of remote URL here
                      //Need to find way of redirecting it to the browser
                       // Send data
                  URL url = new URL("http://localhost:" + browserPort);
                  URLConnection conn = url.openConnection();
                  conn.setDoOutput(true);
                  OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
                  wr.write(s);
                  wr.flush();
        catch(MalformedURLException mue){
             mue.printStackTrace();
        catch(IOException ioe){
             ioe.printStackTrace();
     public static void main (String args[]){
          WebFwd wbfwd = new WebFwd(30280);
}I keep getting a connection refused exception in the while loop of forwardRequest(). There is obviously a "correct" way to do it but before I start mucking around with my firewall I thought I would check that I'm in the right ballpark.
Kind regards,
Chris

Answer 1

Uh, when your proxy (as a web forwarding program is called) receives a GET request, it should reply with the contents of the URL requested.
So
1) read request from socket
2) obtain URL stream
3) write stream contents back to socket
Catfish?