Nio编程selector监听多个端口获取请求信息

Select监听端口，然后获取请求数据

package com.wq.nio;

import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

public class NioTest12 {
    public static void main(String[] args) throws Exception {
        int[] ports = new int[5];
        ports[0]=5000;
        ports[1]=5001;
        ports[2]=5002;
        ports[3]=5003;
        ports[4]=5004;

        Selector selector = Selector.open();
        for (int i = 0; i < ports.length; i++) {
            ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
            serverSocketChannel.configureBlocking(false);
            ServerSocket serverSocket = serverSocketChannel.socket();
            InetSocketAddress inetSocketAddress = new InetSocketAddress(ports[i]);
            serverSocket.bind(inetSocketAddress);

            serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
            System.out.println("监听端口："+ports[i]);
        }

        while(true){
            int number = selector.select();
            System.out.println("number:"+number);
            Set<SelectionKey> SelectionKeys = selector.selectedKeys();
            System.out.println("SelectionKeys"+SelectionKeys);
            Iterator<SelectionKey> iter = SelectionKeys.iterator();
            while (iter.hasNext()){
                SelectionKey selectionKey = iter.next();
                if(selectionKey.isAcceptable()){
                   ServerSocketChannel serverSocketChannel = (ServerSocketChannel) selectionKey.channel();
                    SocketChannel socketChannel = serverSocketChannel.accept();
                    socketChannel.configureBlocking(false);

                    socketChannel.register(selector,SelectionKey.OP_READ);

                    iter.remove();

                    System.out.println("获得客户端连接："+socketChannel);
                }else if(selectionKey.isReadable()){
                    SocketChannel socketChannel  = (SocketChannel) selectionKey.channel();
                    int byteRead = 0;
                    while (true){
                        ByteBuffer byteBuffer = ByteBuffer.allocate(512);
                        byteBuffer.clear();
                        int read = socketChannel.read(byteBuffer);
                        if(read<=0){
                            break;
                        }
                        byteBuffer.flip();
                        socketChannel.write(byteBuffer);
                        byteRead += read;
                        System.out.println("byteRead:"+byteRead+",来自于："+socketChannel);
                        iter.remove();
                    }
                }
            }
        }
    }
}

 

运行结果：telnet localhost 各个端口