求助：（网络编程）为什么这个程序不能运行？

Question

这个是客户/服务器面向连接通信的案例：可是我只能编译但不能运行，我在Socket的构造器的写的IP是我自己电脑的，绝对不会错。望各位高手赐教
(客户端)
import java.io.*;
import java.net.*;public class SayhelloClient
{
  public static void main(String[] args) throws IOException
  {
    Socket socket = new Socket("192.168.1.103", SayhelloServer.PORT);
    try
    {
      BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));      PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);      out.println("您好，这是来自客户端的信息。");
      out.println("END");
      String str = in.readLine();
      System.out.println("服务器端：" + str);
    }
    finally
    {
      socket.close();
    }
  }
}(服务器端)
import java.net.*;
import java.io.*;public class SayhelloServer
{
  public static final int PORT = 8000;  public static void main(String[] args) throws IOException
  {
    ServerSocket s = new ServerSocket(PORT);    try
    {
      Socket socket = s.accept();
      try
      {
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));        PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);        while(true)
        {
          String str = in.readLine();
          if (str.equals("END")) break;
          System.out.println("客户端：" + str);
          out.println("您好，信息已收到。");
        }
      }
      finally
      {
        socket.close();
      }
    }
    finally
    {
      s.close();
    }
  }
}

Answer 1

给你个现成的C/S程序吧,我的调试过了
客户端:
package com.gmail.nuoboxgx.javawebprog.ch01;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;public class EchoClient
{
    private String host = "127.0.0.1";
    
    private int port = 8923;
    
    private Socket socket;
    
    public EchoClient() throws IOException
    {
        socket = new Socket(host, port);
    }
    
    public static void main(String args[]) throws IOException
    {
        new EchoClient().talk();
    }
    
    private PrintWriter getWriter(Socket socket) throws IOException
    {
        OutputStream socketOut = socket.getOutputStream();
        return new PrintWriter(socketOut, true);
    }
    
    private BufferedReader getReader(Socket socket) throws IOException
    {
        InputStream socketIn = socket.getInputStream();
        return new BufferedReader(new InputStreamReader(socketIn));
    }
    
    public void talk() throws IOException
    {
        try
        {
            BufferedReader br = getReader(socket);
            PrintWriter pw = getWriter(socket);
            BufferedReader localReader = new BufferedReader(new InputStreamReader(System.in));
            String msg = null;
            while ((msg = localReader.readLine()) != null)
            {
                
                pw.println(msg);
                System.out.println(br.readLine());
                
                if (msg.equals("bye"))
                    break;
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                socket.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    }
}
服务器段:
package com.gmail.nuoboxgx.javawebprog.ch01;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;public class EchoServer
{
    private int port = 8923;
    
    private ServerSocket serverSocket;
    
    public EchoServer() throws IOException
    {
        serverSocket = new ServerSocket(port);
        System.out.println("服务器启动");
    }
    
    public String echo(String msg)
    {
        return "echo:" + msg;
    }
    
    private PrintWriter getWriter(Socket socket) throws IOException
    {
        OutputStream socketOut = socket.getOutputStream();
        return new PrintWriter(socketOut, true);
    }
    
    private BufferedReader getReader(Socket socket) throws IOException
    {
        InputStream socketIn = socket.getInputStream();
        return new BufferedReader(new InputStreamReader(socketIn));
    }
    
    public void service()
    {
        while (true)
        {
            Socket socket = null;
            try
            {
                socket = serverSocket.accept(); // 等待客户连接
                System.out.println("New connection accepted " + socket.getInetAddress() + ":" + socket.getPort());
                BufferedReader br = getReader(socket);
                PrintWriter pw = getWriter(socket);
                
                String msg = null;
                while ((msg = br.readLine()) != null)
                {
                    System.out.println(msg);
                    pw.println(echo(msg));
                    if (msg.equals("bye")) // 如果客户发送的消息为“bye”，就结束通信
                        break;
                }
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            finally
            {
                try
                {
                    if (socket != null)
                        socket.close(); // 断开连接
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
            }
        }
    }
    
    public static void main(String args[]) throws IOException
    {
        new EchoServer().service();
    }
}