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Forum:
Web Services
How to restrict a certain website from proxy server
Edrew Cardano
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Posts: 3
posted 9 years ago
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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
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) { } } } } }
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