网络通信

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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。

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