TCP通信程序设计方法

public class ClientDemo {
    public static void main(String[] args) throws IOException {
        //创建客户端的Socket对象(Socket)
        //Socket(String host, int port) 创建流套接字并将其连接到指定主机上的指定端口号
        Socket s = new Socket("127.0.0.1",10000);

        //获取输出流，写数据
        //OutputStream getOutputStream() 返回此套接字的输出流
        OutputStream os = s.getOutputStream();
        os.write("hello,tcp,我来了".getBytes());

        //释放资源
        s.close();
    }
}

public class ServerDemo {
    public static void main(String[] args) throws IOException {
        //创建服务器端的Socket对象(ServerSocket)
        //ServerSocket(int port) 创建绑定到指定端口的服务器套接字
        ServerSocket ss = new ServerSocket(10000);

        //Socket accept() 侦听要连接到此套接字并接受它
        Socket s = ss.accept();

        //获取输入流，读数据，并把数据显示在控制台
        InputStream is = s.getInputStream();
        byte[] bys = new byte[1024];
        int len = is.read(bys);
        String data = new String(bys,0,len);
        System.out.println("数据是：" + data);

        //释放资源
        s.close();
        ss.close();
    }
}

// 客户端
public class ClientDemo {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1",10000);

        OutputStream os = socket.getOutputStream();
        os.write("hello".getBytes());
       // os.close();如果在这里关流,会导致整个socket都无法使用
        socket.shutdownOutput();//仅仅关闭输出流.并写一个结束标记,对socket没有任何影响
        
        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String line;
        while((line = br.readLine())!=null){
            System.out.println(line);
        }
        br.close();
        os.close();
        socket.close();
    }
}
// 服务器
public class ServerDemo {
    public static void main(String[] args) throws IOException {
        ServerSocket ss = new ServerSocket(10000);

        Socket accept = ss.accept();

        InputStream is = accept.getInputStream();
        int b;
        while((b = is.read())!=-1){
            System.out.println((char) b);
        }

        System.out.println("看看我执行了吗?");

        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(accept.getOutputStream()));
        bw.write("你谁啊?");
        bw.newLine();
        bw.flush();

        bw.close();
        is.close();
        accept.close();
        ss.close();
    }
}