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