echoclient.java

Java程序设计技巧与开发实例附书源代码。

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

public class EchoClient
{  public static void main(String args[])
   {  try
      {  Socket connection = new Socket(args[0], 7);
         System.out.println("Connection established:");
         DataInputStream  in  = new DataInputStream(
                                   connection.getInputStream());
         DataOutputStream out = new DataOutputStream(
                                   connection.getOutputStream());
         String line = new String("");
         while (!line.toUpperCase().equals(".QUIT"))
         {  System.out.print("Enter string: ");
            line = Console.readString();
            System.out.println("\tSending string to server ... ");
            out.writeUTF(line);
            System.out.println("\tWaiting for server response ...");
            line = in.readUTF();
            System.out.println("Received: " + line);
         }
         in.close();
         out.close();
         connection.close();
      }
      catch(UnknownHostException uhe)
      {  System.err.println("Unknown host: " + args[0]); }
      catch(IOException ioe)
      {  System.err.println("IOException: " + ioe); }
   }
}