java网络测试

//Tcp

public class Test_IP_Client {
    //接受服务器端的数据，并显现出来
    public static void main(String[] args) {
        try {
            Socket s = new Socket("127.0.0.1", 8888);
            InputStream is = s.getInputStream();
            DataInputStream dis = new DataInputStream(is);
            System.out.println(dis.readUTF());
            dis.close();
            s.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public class Test_IP_Server {
    //拿到通信客户端的IP地址，返还给客户端
    public static void main(String[] args) {
        try {
            ServerSocket ss = new ServerSocket(8888);
            while (true){
                Socket s = ss.accept();
                OutputStream os = s.getOutputStream();
                DataOutputStream dos = new DataOutputStream(os);
                dos.writeUTF("hello" + s.getInetAddress() + " port:" + s.getPort());
                dos.close();
                s.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
// Udp

public class Test_Udp_1 {
    //测试 UDP 通信 ，先收后打印
    public static void main(String[] args) throws Exception {
        byte[] buf = new byte[1024];
        DatagramPacket dp = new DatagramPacket(buf,buf.length);
        DatagramSocket ds = new DatagramSocket(5678);
        while(true){
            ds.receive(dp);
            System.out.println(new String(buf, 0, dp.getLength()));
        }
    }
}

public class Test_Udp_2 {
    //测试 UDP 通信，发数据
    public static void main(String[] args) throws Exception {
        byte[] buf = (new String("hello").getBytes());          //byte[] buf = "hell".getBytes();  也可以
        DatagramPacket dp = new DatagramPacket(buf, buf.length,new InetSocketAddress("127.0.0.1",5678));
        DatagramSocket ds = new DatagramSocket(9999);
        ds.send(dp);
        ds.close();
    }
}