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copied!<p>Here is an "echo server" example</p> <pre><code>import java.io.*; import java.net.*; class TCPServer { public static void main(String argv[]) throws IOException { ServerSocket serverSocket = null; DataInputStream serverInput = null; PrintStream serverOutput = null; String line = null; Socket clientSocket = null; // create server socket try { serverSocket = new ServerSocket(2012); clientSocket = serverSocket.accept(); serverInput = new DataInputStream(clientSocket.getInputStream()); serverOutput = new PrintStream(clientSocket.getOutputStream()); } catch(IOException e){System.out.println(e);} // receive data and send it back to the client try { while(true) { line = serverInput.readLine(); if(line.equals("exit")) { break; } else { if(!line.equals(null) && !line.equals("exit")) { System.out.println("Received " +line); line = line+" MODIFIED"; serverOutput.println(line); } } } } catch(IOException e){System.out.println("SERVER SIDE: Unable send/receive data");} try { serverInput.close(); serverOutput.close(); clientSocket.close(); serverSocket.close(); } catch(IOException e){System.out.println(e);} } } </code></pre> <p>Here is the client</p> <pre><code>import java.io.*; import java.net.*; public class TCPClient { public static void main(String[] args) throws IOException { Socket echoSocket = null; PrintWriter out = null; BufferedReader in = null; try { echoSocket = new Socket("localhost", 2012); out = new PrintWriter(echoSocket.getOutputStream(), true); in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream())); } catch (UnknownHostException e) { System.err.println("Don't know about host"); System.exit(1); } catch (IOException e) { System.err.println("Couldn't get I/O"); System.exit(1); } BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in)); String userInput; while ((userInput = stdIn.readLine()) != null) { out.println(userInput); System.out.println("echo: " + in.readLine()); if(userInput.equals("exit")) break; } out.close(); in.close(); stdIn.close(); echoSocket.close(); } } </code></pre>

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