想試試DatagramChannel的write和read方法是否可以收發(fā)信息。

public class DatagramChannelExer3 {
    public static void main(String[] args) throws InterruptedException{
        Thread server = new Thread(new Server3());
        server.start();
        
        Thread.sleep(1000);
        
        Thread client = new Thread(new Client3());
        client.start();
        
    }
}

class Server3 implements Runnable{

    @Override
    public void run() {        
        try {
            DatagramChannel dc = DatagramChannel.open();
            SocketAddress sc = new InetSocketAddress("localhost", 9988); 
            //不采取bind的方式，而是改為connect的方式
            dc.connect(sc);
            //創(chuàng)建緩沖區(qū)
            ByteBuffer buffer = ByteBuffer.allocate(1024);
            
            System.out.println(dc.isConnected());
            while(true){
                int length = dc.read(buffer);
                System.out.println(length);
                
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        
    }
}

class Client3 implements Runnable{

    @Override
    public void run() {
        try {
            DatagramChannel dc = DatagramChannel.open();
            
            SocketAddress connectAddress = new InetSocketAddress("localhost", 9988);
            
            ByteBuffer buffer = ByteBuffer.allocate(1024);
            
            dc.connect(connectAddress);
            buffer.put("hello world".getBytes());
            buffer.flip();
            
            dc.write(buffer);
            
            //關(guān)閉通道
            dc.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
    }
    
}

但是程序一直在read的方法出被阻塞，獲取不到任何消息，想問如果利用read和write方法來收發(fā)消息的話，正確的寫法應(yīng)該是怎樣的。
求各位大神幫助，謝謝！