NIOSocket Server Client

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最近在看Netty架構，順便寫了一下NIO SocketChannel服務端和用戶端

Server.java

import java.io.IOException;import java.net.InetSocketAddress;import java.nio.ByteBuffer;import java.nio.channels.ServerSocketChannel;import java.nio.channels.SocketChannel;/** * Created by guanxianseng on 2017/8/18. */public class Server {    private static void readMessage() throws IOException {        ServerSocketChannel server = ServerSocketChannel.open();        server.socket().bind(new InetSocketAddress(8888));        while(true){            SocketChannel client = server.accept();            ByteBuffer buffer = ByteBuffer.allocate(1024);            client.read(buffer);            System.out.println("Server received msg = " + new String(buffer.array()));            sendMessage(client);        }    }    private static void sendMessage(SocketChannel client) throws IOException {        ByteBuffer buffer = ByteBuffer.allocate(1024);        String msg = "Server Time = " + System.currentTimeMillis();        buffer.put(msg.getBytes());        buffer.flip();        client.write(buffer);    }    public static void main(String[] args) throws IOException {        readMessage();    }}

Client.java

import java.io.IOException;import java.net.InetSocketAddress;import java.nio.ByteBuffer;import java.nio.channels.SocketChannel;/** * Created by guanxianseng on 2017/8/18. */public class Client {    private static SocketChannel client = null;    static {        try {            init();        } catch (IOException e) {            e.printStackTrace();        }    }    private static void init() throws IOException {        client  = SocketChannel.open();        client.connect(new InetSocketAddress("127.0.0.1", 8888));    }    private static void sendMessage(String message) throws IOException {        ByteBuffer buffer = ByteBuffer.allocate(1024);        buffer.put(message.getBytes());        buffer.flip();        while(buffer.hasRemaining()){            client.write(buffer);        }//        client.close();    }    private static void readMessage(){        Thread reader = new Thread(new Runnable() {            @Override            public void run() {                ByteBuffer buffer = ByteBuffer.allocate(1024);                try {                    client.read(buffer);//                    buffer.flip();                    System.out.println(new String(buffer.array()));                } catch (IOException e) {                    e.printStackTrace();                }            }        });        reader.start();    }    public static void main(String[] args) throws IOException {        sendMessage("hello nio");        readMessage();    }}

整個套路和Socket、ServerSocket套路是一樣的，這是阻塞形式的。NIO可以設定為非阻塞，這需要配合使用Selector。這種就和Socket、ServerSocket就不一樣了

NIOSocket Server Client