使用NIO实现一个echo服务器_用nio技术替代一客户一线程技术改写echo项目的客户机/服务器设计。

    一个简单的echo服务器，客户端向服务端发送消息，服务端进行响应，当客户端发送quit字符串时，断开客户端和服务端的连接。使用NIO实现

    服务端代码

public class EchoServer_NIO {
    private Selector selector;
    private ByteBuffer sendBuf = ByteBuffer.allocate(1024);
    private ByteBuffer recBuf = ByteBuffer.allocate(1024);
    public EchoServer_NIO(){
        try {
            System.out.println("服务器正在启动");
            selector = Selector.open();
            ServerSocketChannel ssc = ServerSocketChannel.open();
            //设置非阻塞模式
            ssc.configureBlocking(false);
            //绑定端口
            ssc.bind(new InetSocketAddress(8777));
            ssc.register(selector, SelectionKey.OP_ACCEPT);
            System.out.println("服务器启动成功");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("服务器启动失败");
        }
    }
 
    public static void main(String[] args) {
        new EchoServer_NIO().service();
    }
 
    public void service(){
        while (true){
            try {
                int select = selector.select();
                if (select>0){
                    Set<SelectionKey> selectionKeys = selector.selectedKeys();
                    Iterator<SelectionKey> iterator = selectionKeys.iterator();
                    while (