不用netty实现OIO和NIO连接通信

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首先是 OIO server端的

package com.fk.testIO;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;import java.nio.charset.Charset;/** * Created by fengkai on 11/04/17. */public class OIO {    public void serve(int port) throws IOException{        //绑定端口        final ServerSocket socket = new ServerSocket(port);        for(;;){            final Socket clientSocket = socket.accept();            System.out.println("A connetction from " +clientSocket);            new Thread(new Runnable() {                @Override                public void run() {                    OutputStream out;                    InputStream in;                    try{                        in = clientSocket.getInputStream();                        byte[] bytes = new byte[1024];                        int bytelen = 0;                        int bytein = 0;                        StringBuffer sb = new StringBuffer();                        while ((bytelen = in.read(bytes)) != -1){                            String str = new String(bytes, bytein, bytelen);                            sb.append(str);                        }                        System.out.println(sb.toString());                        out = clientSocket.getOutputStream();                        out.write("HelloWorld".getBytes(Charset.forName("UTF-8")));                        out.flush();                        clientSocket.close();                    }catch (IOException e){                        e.printStackTrace();                    }                }            }).start();        }    }    public static void main(String[] args) {        final int port = 8888;        new Thread(new Runnable() {            @Override            public void run() {                try {                    new OIO().serve(port);                } catch (IOException e) {                    e.printStackTrace();                }            }        }).start();    }}

接下来是NIO 的server

package com.fk.testIO;import java.io.IOException;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;/** * Created by fengkai on 11/04/17. */public class NIO {    public void service(int port) throws IOException{        // 打开selector 处理channel        ServerSocketChannel serverChannel = ServerSocketChannel.open();        serverChannel.configureBlocking(false);        ServerSocket socket = serverChannel.socket();        InetSocketAddress adress = new InetSocketAddress(port);        socket.bind(adress);        Selector selector = Selector.open();        //注册selector        serverChannel.register(selector, SelectionKey.OP_ACCEPT);        final ByteBuffer msg = ByteBuffer.wrap("hello".getBytes());        for(;;){            //等待新的处理事件            try {                selector.select();            } catch (IOException e) {                e.printStackTrace();                break;            }            //所有的selectionKey实例            Set<SelectionKey> readKeys = selector.selectedKeys();            Iterator<SelectionKey> iterator = readKeys.iterator();            while (iterator.hasNext()){                SelectionKey key = iterator.next();                iterator.remove();;                //查看它是否是等待接受的新连接                try {                    if(key.isAcceptable()){                        ServerSocketChannel server = (ServerSocketChannel) key.channel();                        SocketChannel client = server.accept();                        client.configureBlocking(false);                        client.register(selector, SelectionKey.OP_WRITE|SelectionKey.OP_READ, msg.duplicate());                        System.out.println("a new Connetion" + client);                    }                    //准备好写                    if(key.isWritable()){                        SocketChannel client = (SocketChannel) key.channel();                        ByteBuffer buffer = (ByteBuffer) key.attachment();                        while (buffer.hasRemaining()){                            if(client.write(buffer) == 0){                                break;                            }                        }                        client.close();                    }                } catch (IOException e) {                    e.printStackTrace();                    key.cancel();                    try {                        key.channel().close();                    }catch (IOException cex){                        cex.printStackTrace();                    }                }            }        }    }}

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