TCP编程，Socket通讯

网络编程分两种，一种是TCP编程，还有一种是UDP编程（点击打开链接）。而本文先讲述简单的TCP编程，Socket套接字连接通讯，实现简单的client与server之间的信息传输。

以下是client与server之间简单的传输数据（单对单）：

注意：服务端先启动。然后再启动client。

client：

public class C {
	public static void main(String[] args) {
		try {
			Socket s = new Socket("172.18.122.64", 10086); //訪问服务端是本地server,port号是10086，要同样
			if(s.isConnected()){
				System.out.println("client成功连接");
			}
			BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
			Scanner in = new Scanner(System.in);
			/*GetMsg get = new GetMsg(s);
			get.start();*/
			while(true){
				String s1 = in.next();
				if(s1.equals("exit")){
					break;
				}
				bw.write(s1);
				bw.newLine();
				bw.flush();
			}
			bw.close();
			s.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 

	}

}

服务端：

public class S {
	public static void main(String[] args) {
		try {
			ServerSocket server = new ServerSocket(10086);   //服务端，port是10086
			Socket s = server.accept();                     //開始监听连入的客户port
			String clientip = s.getInetAddress().getHostAddress();  //获得客户端ip地址
			System.out.println("连入服务器的是来自:"+clientip);
			boolean flag = true;
			GetMsg get = new GetMsg(s);
			get.start();
			/*SendMsg send = new SendMsg(s);
			send.start();*/
			while(flag){

			}
			s.close();
			server.close();

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public class GetMsg extends Thread {
	private Socket s;
	public GetMsg(Socket s){
		this.s = s;
	}
	@Override
	public void run() {
		// TODO Auto-generated method stub
		BufferedReader br;
		String str;
		try {
			br = new BufferedReader(new InputStreamReader(s.getInputStream()));
			boolean flag = true;
			while(flag){
				if((str=br.readLine())!=null){
					System.out.println(str);
				}
			}
			br.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

实验结果：

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以上实现的是client与server端一对一之间的通讯。也能够实现多人聊天的功能，而server在这之间的角色就相当于中介。负责转发信息。假设须要多人聊天的能够留下邮箱或qq号我发给你。