最简单网络编程之客户端往服务器端送东西

package com.lin;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.ServerSocket;import java.net.Socket;public class MyTCPServer {//服务器端程序private BufferedReader reader;// 创建BufferedReader对象private ServerSocket server;// 创建服务套接字对象private Socket socket;public void getServer() {try {server = new ServerSocket(8998);System.out.println("服务器套接字已创建成功");while (true) {System.out.println("等待客户机的连接");socket = server.accept();//等待客户机的连接,进入等待状态//当客户端能够连接上之后,读取客户端传过来的东西reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));getClientMessage();}} catch (Exception e) {e.printStackTrace();}}private void getClientMessage() {try {while (true) {if (reader.ready()) {// 获得客户端信息System.out.println("客户机：" + reader.readLine());}}} catch (Exception e) {e.printStackTrace();} finally {try {if (reader != null)reader.close();if (socket != null)socket.close();} catch (IOException e) {e.printStackTrace();}}}public static void main(String[] args) {MyTCPServer tcp = new MyTCPServer();tcp.getServer();}}

客户端程序

package com.lin;import java.io.OutputStream;import java.net.Socket;public class MyTCPClient {public static void main(String[] args) {Socket s = null;OutputStream os = null;        try {        // 建立连接        s = new Socket("127.0.0.1",8998);//在客户端建立连接要指定ip 和要链接的服务器端口        os = s.getOutputStream();//这里 的OutputStream是从Socket里获取的        //向服务器发送东西        os.write("1hahaha".getBytes());} catch (Exception e) {e.printStackTrace();}finally{try {if(s!=null)s.close();if(s!=null)s.close();} catch (Exception e) {e.printStackTrace();}}}}

先启动服务器端程序，再启动客户端程序