java nio

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java nio Demo：

NIOServer：

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;public class NIOServer {private Selector selector;public void initServer(int port) throws IOException{ServerSocketChannel serverChannel=ServerSocketChannel.open();serverChannel.configureBlocking(false);serverChannel.socket().bind(new InetSocketAddress(port));this.selector=Selector.open();serverChannel.register(selector, SelectionKey.OP_ACCEPT);}public void listen() throws IOException{System.out.println("服务器启动");while(true){selector.select();Iterator<SelectionKey> it=this.selector.selectedKeys().iterator();while(it.hasNext()){SelectionKey key=it.next();it.remove();if(key.isAcceptable()){ServerSocketChannel server= (ServerSocketChannel) key.channel();SocketChannel channel=server.accept(); channel.configureBlocking(false);channel.write(ByteBuffer.wrap(new String("向服务端发送一条消息").getBytes()));channel.register(selector,SelectionKey.OP_READ);}else if(key.isReadable()){readKey(key);}}}}private void readKey(SelectionKey key) throws IOException {SocketChannel channel=(SocketChannel) key.channel();ByteBuffer buf=ByteBuffer.allocate(256);channel.read(buf);byte[] msg=buf.array();String message=new String(msg).trim();System.out.println("服务器收到消息："+message);ByteBuffer backBuf=ByteBuffer.wrap(message.getBytes());channel.write(backBuf);}public static void main(String[] args) throws IOException {NIOServer server=new NIOServer();server.initServer(8000);server.listen();}}

NIOClient：

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.SocketChannel;import java.util.Iterator;public class NIOClient {private Selector selector;public void initClient(String ip,int port) throws IOException{SocketChannel channel=SocketChannel.open();channel.configureBlocking(false);this.selector=Selector.open();channel.connect(new InetSocketAddress(ip,port));channel.register(selector,SelectionKey.OP_CONNECT);}public void listen() throws IOException{while(true){selector.select();Iterator<SelectionKey> it=selector.selectedKeys().iterator();while(it.hasNext()){SelectionKey key=it.next();it.remove();if(key.isConnectable()){SocketChannel channel=(SocketChannel) key.channel();if(channel.isConnectionPending()){channel.finishConnect();}channel.configureBlocking(false);channel.write(ByteBuffer.wrap(new String("向服务器发送一条信息").getBytes()));channel.register(selector,SelectionKey.OP_READ);}else if(key.isReadable()){read(key);}}}}private void read(SelectionKey key) throws IOException {SocketChannel channel=(SocketChannel) key.channel();ByteBuffer buf=ByteBuffer.allocate(256);channel.read(buf);String str=new String(buf.array()).trim();System.out.println("收到服务器信息："+str);}public static void main(String[] args) throws IOException {NIOClient nioClient=new NIOClient();nioClient.initClient("localhost", 8000);nioClient.listen();}}

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