JAVA NIO之UDP

最新推荐文章于 2025-03-30 23:46:14 发布

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本文详细介绍了使用Java NIO进行网络编程的具体实现，包括DatagramChannel的非阻塞模式发送数据，以及通过Selector监听和接收数据的过程。通过实例演示了客户端与服务器之间的UDP数据包交互。

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package NIONet;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.util.Scanner;

public class DatagramTest {

	public static void main(String[] args) {
		test1();
	}
	public static void test1() {
		try {
			DatagramChannel dc=DatagramChannel.open();
			//设置成非阻塞模式
			dc.configureBlocking(false);
			ByteBuffer buf=ByteBuffer.allocate(1024);
			Scanner scan=new Scanner(System.in);
			while(scan.hasNext()) {
				String content=scan.next();
				buf.put(content.getBytes());
				buf.flip();
				dc.send(buf, new InetSocketAddress("127.0.0.1", 9898));
				buf.clear();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

package NIONet;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.Iterator;

public class ReceiveTtest {

	
	public static void main(String[] args) {
		receive();
	}
	
	public static void receive() {
		
		try {
			DatagramChannel dc= DatagramChannel.open();
			//切换到非阻塞模式
			dc.configureBlocking(false);
			
			dc.bind(new InetSocketAddress(9898));
			
			Selector selector=Selector.open();
			//将通道注册到选择器上
			dc.register(selector, SelectionKey.OP_READ);
			
			while(selector.select()>0) {
				Iterator<SelectionKey> it=selector.selectedKeys().iterator();
				while(it.hasNext()) {
					SelectionKey sk=it.next();
					if(sk.isReadable()) {
						ByteBuffer buf=ByteBuffer.allocate(1024);
						dc.receive(buf);
						buf.flip();
						System.out.println(new String(buf.array(),0,buf.limit()));
						buf.clear();
					}
				}
				it.remove();
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	
	}
}