socketclient.java

来自「Java the UML Way 书中所有源码」· Java 代码 · 共 60 行

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

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

class SocketClient {
  public static void main(String[] args) {
    try {
      /* Input will be read from the console, see section 11.7 */
      InputStreamReader readingConnToConsole = new InputStreamReader(System.in);
      BufferedReader fromConsoleReader = new BufferedReader(readingConnToConsole);

      /* Inputs name of the server machine from the user*/
      System.out.print("The name of the machine where the server program is running: ");
      String serverMachine = fromConsoleReader.readLine();

      /* Contacts the server program */
      Socket connection = new Socket(serverMachine, 1250);
      System.out.println("Now the connection to the server program is established.");

      /* Opens streams to the server program */
      InputStreamReader readConnection
                        = new InputStreamReader(connection.getInputStream());
      BufferedReader fromServerReader = new BufferedReader(readConnection);
      PrintWriter toServerWriter = new PrintWriter(connection.getOutputStream(), true);

      /* Receives the introductory text from the server, and prints it to the console */
      String intro1 = fromServerReader.readLine();
      String intro2 = fromServerReader.readLine();
      System.out.println(intro1 + "\n" + intro2);

      /* Inputs one line of text from the console (the user) */
      String aLine = fromConsoleReader.readLine();
      while (!aLine.equals("")) {
        toServerWriter.println(aLine);  // sends the text to the server program
        String response = fromServerReader.readLine();  // receives response from the server
        System.out.println(response);
        aLine = fromConsoleReader.readLine();
      }
      connection.close();  // shuts down the connection

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

/* Example Run:
Output at the client side:
The name of the machine where the server program is running: mary.marysHome.dk
Now the connection to the server program is established.
***Hello, you are connected to the server side!
***Write what you want, then I will repeat it. End with a carriage return.
Hello, this is a test!
***You wrote: Hello, this is a test!
Yes, I did! It works!
***You wrote: Yes, I did! It works!
*/