使用NIO实现非阻塞式（相对的）多人聊天室

package d02_test;

import java.io.IOException;
import java.net.InetSocketAddress;
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;

/**
 * zt
 * 2020/8/11
 * 18:02
 */
public class Server {
    public static void main(String[] args) {
        //1.创建ServerSockChannel
        ServerSocketChannel listener = null;
        try {
            listener = ServerSocketChannel.open();
            //2.绑定地址
            listener.bind(new InetSocketAddress("10.0.139.160",10086));
            //3.设置非阻塞模式
            listener.configureBlocking(false);
            //4.创建selector选择器
            Selector selector = Selector.open();
            //5.把通道注册到选择器，并指定注册事件
            listener.register(selector, SelectionKey.OP_ACCEPT);
            //6.轮询(Select()阻塞方法。没有事件发送阻塞)
            System.out.println("服务器启动.....0.0");
            while (selector.select()>0){
                //7.处理
                Set<SelectionKey> selectionKeys = selector.selectedKeys();
                Iterator<SelectionKey> iterator = selectionKeys.iterator();
                while (iterator.hasNext()){
                    SelectionKey selectionKey = iterator.next();
                    if(selectionKey.isAcceptable()){
                        SocketChannel socketChannel = listener.accept();
                        System.out.println(socketChannel.getRemoteAddress()+"进入聊天室");
                        //设置非阻塞式模式
                        socketChannel.configureBlocking(false);
                        //注册到selector
                        socketChannel.register(selector, SelectionKey.OP_READ);
                    }else if(selectionKey.isReadable()){
                        //读取数据
                        SocketChannel channel = (SocketChannel) selectionKey.channel();
                        ByteBuffer buffer = ByteBuffer.allocate(1024);
                        int len = 0;
                        //不会阻塞
                        try {
                            while ((len=channel.read(buffer))>0){
                                buffer.flip();
                                String data = new String(buffer.array(),0,buffer.limit());
                                System.out.println(channel.getRemoteAddress()+"说："+data);
                                buffer.clear();
                            }
                            //开启线程回复
                            if(len==1){
                                System.out.println(channel.getRemoteAddress()+"退出 了");
                                channel.close();
                            }
                        } catch (IOException e) {
                            System.out.println(channel.getRemoteAddress()+"异常退出了");
                            channel.close();
                        }

                    }
                    //已经处理过了键删除掉
                    iterator.remove();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                listener.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


    }
}

package d02_test;


import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.util.Scanner;

/**
 * zt
 * 2020/8/11
 * 18:02
 */
public class Client {
    public static void main(String[] args) throws Exception {
        //1.创建socketchannel
        SocketChannel socketChannel = SocketChannel.open(new InetSocketAddress("10.0.139.160",10086));
        //2.设置为非阻塞模式
        socketChannel.configureBlocking(false);
        //3.控制台录入并写出
        Scanner sc = new Scanner(System.in);
        while (true){
            String data = sc.next();
            ByteBuffer buffer = ByteBuffer.allocate(1024);
            buffer.put(data.getBytes());
            buffer.flip();
            socketChannel.write(buffer);
            buffer.clear();
            if(data.equals("886")){
                break;
            }
        }
        //关闭
        socketChannel.close();

    }
}

服务器启动.....0.0
/10.0.139.160:60397进入聊天室
/10.0.139.160:60397说：呱？
/10.0.139.160:60397说：你好啊

呱？
你好啊