Jiajie Zhuo

这是一个用Java实现网络通信的例子，原理就是用Socket对象的输入和输出流实现接收和发送数据包。代码如下：

//MyClient.java

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

public class MyClient {
   public static void main(String[] args) {
      try {
         Socket s = new Socket("localhost", 8000);

         OutputStream os = s.getOutputStream();
         OutputStreamWriter osw = new OutputStreamWriter(os);
         PrintWriter pw = new PrintWriter(osw, true);

         pw.println("zhuojiaoshou");
         System.out.println("client send complete");

         InputStream is = s.getInputStream();
         InputStreamReader isr = new InputStreamReader(is);
         BufferedReader br = new BufferedReader(isr);

         String mess = br.readLine();
         System.out.println("client receive complete");
         System.out.println(mess);
      } catch(Exception e) { }
   }
}

//MyServer.java

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

public class MyServer {
   public static void main(String[] args) {
      try {
         ServerSocket ss = new ServerSocket(8000);

         Socket s = ss.accept();

            InputStream is = s.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);

            String name = br.readLine();
            System.out.println("server receive complete, " + name);

            OutputStream os = s.getOutputStream();
         OutputStreamWriter osw = new OutputStreamWriter(os);
         PrintWriter pw = new PrintWriter(osw, true);

            pw.println("Welcome " + name);

            System.out.println("server write back complete");
        } catch (Exception e) {
          e.printStackTrace();
        }
   }
}

第一步：先启动服务器端，打开一个8000端口（注意不要使用已经占用的端口，这样会抛出异常）。

第二步：启动客户端，地址可以使用“localhost”或者“127.0.0.1”（本地通信，若想在不同的主机上实现则需填入对方服务器的IP地址），设置跟服务器相同的端口号。

最后，使用输入输出流便可实现数据通信。