socketserver.java

Java the UML Way 书中所有源码

/*
 * SocketServer.java  E.L.  2001-08-25
 */

import java.io.*;
import java.net.*;

public class SocketServer {
  public static void main(String[] args) {
    try {
      ServerSocket server = new ServerSocket(1250);
      System.out.println("Log for the server side. Now we wait...");
      Socket connection = server.accept();  // waits until someone contacts us

      /* Opens communication streams to the client side program */
      InputStreamReader readConnection
        = new InputStreamReader(connection.getInputStream());
      BufferedReader fromClientReader = new BufferedReader(readConnection);
      PrintWriter toClientWriter = new PrintWriter(connection.getOutputStream(), true);

      /* Sends introductory text to the client side program */
      toClientWriter.println("***Hello, you are connected to the server!");
      toClientWriter.println("***Write what you want, then I will repeat it. " +
                        "End with a carriage return.");

      /* Receives data from the client side program */
      String aLine = fromClientReader.readLine();  // receives one line with text
      while (aLine != null) {  // the client side program has shut down the connection
        System.out.println("A client wrote: " + aLine);
        toClientWriter.println("***You wrote: " + aLine);  // sends answer to the client
        aLine = fromClientReader.readLine();
      }

      connection.close(); // shuts down

    } catch (Exception e) {
      System.out.println("Error at the server side: " + e);
    }
  }
}

/* Example Run:
Output at the server side:
Log for the server side. Now we wait...
A client wrote: Hello, this is a test!
A client wrote: Yes, I did! It works!
*/