Java中NioSocket的用法--Spring MVC

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这里写图片描述

package com.test2;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.nio.charset.Charset;import java.util.Iterator;public class NIOServer {public static void main(String[] args) throws Exception{        //创建ServerSocketChannel，监听8082端口        ServerSocketChannel ssc = ServerSocketChannel.open();        ssc.socket().bind(new InetSocketAddress(8082));        //设置为非阻塞模式        ssc.configureBlocking(false);        //为ssc注册选择器        Selector selector = Selector.open();        ssc.register(selector, SelectionKey.OP_ACCEPT);        //创建处理器        Handler handler = new Handler(1024);        while (true) {            //等待请求，每次等待阻塞3s，超过3s后线程继续向下运行，如果传入0或者不传参数将一直阻塞            if (selector.select(3000) == 0) {                System.out.println("等待请求超时。。。。。。。。。");                continue;            }            System.out.println("处理请求。。。。。");            //获取待处理的SelectionKey            Iterator<SelectionKey> keyIter = selector.selectedKeys().iterator();            while (keyIter.hasNext()) {                SelectionKey key = keyIter.next();                try {                    //接收到链接请求时                    if (key.isAcceptable()) {                        handler.handleAccept(key);                    }                    //读数据                    if (key.isReadable()) {                        handler.handleRead(key);                    }            } catch (Exception e) {                    // TODO: handle exception                    keyIter.remove();                    continue;                }            }        }     }}

package com.test2;import java.io.IOException;import java.nio.ByteBuffer;import java.nio.channels.SelectionKey;import java.nio.channels.ServerSocketChannel;import java.nio.channels.SocketChannel;import java.nio.charset.Charset;public class Handler {    private int bufferSize=1024;    private String localCharset="UTF-8";    public Handler() {  }    public Handler(int bufferSize) {            this(bufferSize,null);    }    public Handler(int bufferSize, String localCharset) {        // TODO Auto-generated constructor stub        if(bufferSize>0)            this.bufferSize=bufferSize;        if(localCharset!=null)            this.localCharset=localCharset;    }    public void handleAccept(SelectionKey key) throws IOException{        SocketChannel sc=((ServerSocketChannel) key.channel()).accept();        sc.configureBlocking(false);        sc.register(key.selector(), SelectionKey.OP_READ,ByteBuffer.allocate(bufferSize));    }    public void handleRead(SelectionKey key) throws IOException{        //获取channel        SocketChannel sc=(SocketChannel) key.channel();        //获取buffer并重置        ByteBuffer buffer=(ByteBuffer) key.attachment();        buffer.clear();        //没有读到内容则关闭        if(sc.read(buffer)==-1) {            sc.close();        }else {            //将buffer转换为读状态            buffer.flip();            //将buffer中接收到的值按localCharset格式编码后保存在receivedString            String receivedString=Charset.forName(localCharset).newDecoder().decode(buffer).toString();            System.out.println("receive from client: "+receivedString);            //返回数据给客户端            String sendString ="receive data: "+receivedString;            buffer=ByteBuffer.wrap(sendString.getBytes(localCharset));            sc.write(buffer);            sc.close();        }    }}

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