2022-08-11 田龙跃学习笔记

Socket通信

1.DatagramSocket-UDP类 .send(DatagramPacket类的报文包)
UDP只是收发报文包进行通信

点击查看发包和收包

public class DatagramSocketTest {
    @Test
    public void client() throws Exception {
//        构建UDP对象
        DatagramSocket datagramSocket=new DatagramSocket();
//        构建数据包
        String str="哈哈哈哈哈哈哈哈哈";
        DatagramPacket datagramPacket=new DatagramPacket(str.getBytes(),0,str.getBytes().length);
//        获取链接
        datagramSocket.connect(InetAddress.getLocalHost(),8888);
//        发送数据包
        datagramSocket.send(datagramPacket);
//        关闭资源
        datagramSocket.close();
    }
    @Test
    public void server() throws Exception {
//        构建UDP对象
        DatagramSocket datagramSocket = new DatagramSocket(8888);
//        构建数据包
        byte [] bytes=new byte[1024];
        DatagramPacket datagramPacket=new DatagramPacket(bytes,0,1024);
//        收包
        datagramSocket.receive(datagramPacket);
        byte[] data = datagramPacket.getData();
        System.out.println(new String(bytes,0,bytes.length));
//        关闭资源
        datagramSocket.close();
    }
}

2.ServerSocket-TCP类服务器端 .accept接受链接 accept.获取流

ServletSocket套接字简单实用

    @Test
    public void server() throws IOException {
//        服务器对象——端口
        ServerSocket serverSocket=new ServerSocket(8889);
        System.out.println("服务器运行");
//        开启服务器——接受访问
        Socket accept = serverSocket.accept();
//        获取输出流用来读取客户端传来的消息
        InputStream inputStream = accept.getInputStream();
//        输出流读
        int len;
        byte [] bytes=new byte[1024];
        while ((len=inputStream.read(bytes))!=-1){
            System.out.println(new String(bytes,0,len));
        }
//        关闭资源
        inputStream.close();
        accept.close();
    }

3.Socket-TCP客户端 .connect链接服务器 socket.获取流

Socket套接字简单实用

   @Test
    public void client() throws IOException {
//        创建Socket对象
        Socket socket=new Socket();
        System.out.println("客户端运行");
//        获取链接 ip地址+端口号
        socket.connect(new InetSocketAddress(InetAddress.getLocalHost(),8889));
//       获取输出流
        OutputStream outputStream = socket.getOutputStream();
        String string="Hello Service";
        outputStream.write(string.getBytes());
//       关闭资源
        outputStream.close();
        socket.close();
  }