echoserver.java

来自「java 完全探索的随书源码」· Java 代码 · 共 50 行

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

public class EchoServer
{
  public static final int PORT = 7;

  // Default Constructor
  public EchoServer()
  {
    super();
  }

  public void startEcho()
  {
    try
    {
      // Create a Server Socket on the
      ServerSocket server = new ServerSocket( PORT );
      // Wait for a single client to connect
      System.out.println( "Waiting on a client to connect" );
      Socket clientSocket = server.accept();

      System.out.println( "Client requested a connection to the echo server" );
      BufferedReader input = new BufferedReader( new InputStreamReader( clientSocket.getInputStream() ));
      PrintWriter output = new PrintWriter( clientSocket.getOutputStream(), true);

      // Get the data from the client
      String msg = input.readLine();
      System.out.println( "Client sent " + msg );

      // Send the data back to the client
      output.println( msg );

      System.out.println( "echo server exiting..." );
      clientSocket.close();
    }
    catch( IOException ex )
    {
      System.err.println( "Failed I/O: " + ex );
      System.exit( 1 );
    }
  }

  public static void main(String[] args)
  {
    EchoServer echoServer = new EchoServer();
    echoServer.startEcho();
  }
}