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  1. #1
    deerlittle7 is offline Member
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    Default How to restrict a certain website from proxy server

    Hi,

    I have this code and I need to have some idea on how would i use it to restrict certain websites to be accessed. kindly help me



    SimpleProxyServer.java
    Java Code:
    import java.io.*;
    import java.net.*;
     
    public class SimpleProxyServer {
      public static void main(String[] args) throws IOException {
        try {
          String host = "your Proxy Server";
          int remoteport = 100;
          int localport = 111;
          // Print a start-up message
          System.out.println("Starting proxy for " + host + ":" + remoteport
              + " on port " + localport);
          // And start running the server
          runServer(host, remoteport, localport); // never returns
        } catch (Exception e) {
          System.err.println(e);
        }
      }
     
      /**
       * runs a single-threaded proxy server on
       * the specified local port. It never returns.
       */
      public static void runServer(String host, int remoteport, int localport)
          throws IOException {
        // Create a ServerSocket to listen for connections with
        ServerSocket ss = new ServerSocket(localport);
     
        final byte[] request = new byte[1024];
        byte[] reply = new byte[4096];
     
        while (true) {
          Socket client = null, server = null;
          try {
            // Wait for a connection on the local port
            client = ss.accept();
     
            final InputStream streamFromClient = client.getInputStream();
            final OutputStream streamToClient = client.getOutputStream();
     
            // Make a connection to the real server.
            // If we cannot connect to the server, send an error to the
            // client, disconnect, and continue waiting for connections.
            try {
              server = new Socket(host, remoteport);
            } catch (IOException e) {
              PrintWriter out = new PrintWriter(streamToClient);
              out.print("Proxy server cannot connect to " + host + ":"
                  + remoteport + ":\n" + e + "\n");
              out.flush();
              client.close();
              continue;
            }
     
            // Get server streams.
            final InputStream streamFromServer = server.getInputStream();
            final OutputStream streamToServer = server.getOutputStream();
     
            // a thread to read the client's requests and pass them
            // to the server. A separate thread for asynchronous.
            Thread t = new Thread() {
              public void run() {
                int bytesRead;
                try {
                  while ((bytesRead = streamFromClient.read(request)) != -1) {
                    streamToServer.write(request, 0, bytesRead);
                    streamToServer.flush();
                  }
                } catch (IOException e) {
                }
     
                // the client closed the connection to us, so close our
                // connection to the server.
                try {
                  streamToServer.close();
                } catch (IOException e) {
                }
              }
            };
     
            // Start the client-to-server request thread running
            t.start();
     
            // Read the server's responses
            // and pass them back to the client.
            int bytesRead;
            try {
              while ((bytesRead = streamFromServer.read(reply)) != -1) {
                streamToClient.write(reply, 0, bytesRead);
                streamToClient.flush();
              }
            } catch (IOException e) {
            }
     
            // The server closed its connection to us, so we close our
            // connection to our client.
            streamToClient.close();
          } catch (IOException e) {
            System.err.println(e);
          } finally {
            try {
              if (server != null)
                server.close();
              if (client != null)
                client.close();
            } catch (IOException e) {
            }
          }
        }
      }
    }

  2. #2
    Norm's Avatar
    Norm is offline Moderator
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    Default Re: How to restrict a certain website from proxy server

    If you don't understand my response, don't ignore it, ask a question.

  3. #3
    DarrylBurke's Avatar
    DarrylBurke is offline Forum Police
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    Default Re: How to restrict a certain website from proxy server

    If you're forever cleaning cobwebs, it's time to get rid of the spiders.

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