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coderbruiscoderbruis
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将文章添加到note中
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‎Spring-Netty/src/main/java/com/bruis/learnnetty/bio/Client.java‎

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public class Client {
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private static final String HOST = "127.0.0.1";
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private static final int PORT = 8000;
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// 休眠时间
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private static final int SLEEP_TIME = 5000;
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// 最大数据大小
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public static final int MAX_DATA_LEN = 1024;
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public static void main(String[] args) throws IOException {
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while (true) {
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try {
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Scanner scan = new Scanner(System.in);
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// 读取控制台输入信息
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String clientMessage = scan.nextLine();
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System.out.println("客户端发送数据: " + clientMessage);
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// 将数据写入流中
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socket.getOutputStream().write(clientMessage.getBytes());
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// 将数据从JVM中读取出来，存放在输入流中
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InputStream inputStream = socket.getInputStream();
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byte[] data = new byte[MAX_DATA_LEN];

‎Spring-Netty/src/main/java/com/bruis/learnnetty/nio/demo01/NIOClient.java‎

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package com.bruis.learnnetty.nio.demo01;
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import java.net.InetSocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.channels.SocketChannel;
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/**
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* @author LuoHaiYang
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*/
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public class NIOClient {
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public static void main(String[] args) throws Exception {
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// 获取一个SocketChannel
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SocketChannel socketChannel = SocketChannel.open();
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// 设置非阻塞
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socketChannel.configureBlocking(false);
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// 提供服务端的ip和端口
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InetSocketAddress inetSocketAddress = new InetSocketAddress("127.0.0.1", 6666);
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// 连接服务器
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if (!socketChannel.connect(inetSocketAddress)) {
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while (!socketChannel.finishConnect()) {
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System.out.println("因为连接需要时间， 客户端不会阻塞，可以做其他工作了...");
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}
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}
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// 如果连接成功，就发送数据
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String str = "hello, bruis~";
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// 把字节数组包装成buffer
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ByteBuffer buffer = ByteBuffer.wrap(str.getBytes());
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// 发送数据，将buffer数据写入channel
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socketChannel.write(buffer);
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System.in.read();
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}
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}

‎Spring-Netty/src/main/java/com/bruis/learnnetty/nio/demo01/NIOServer.java‎

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package com.bruis.learnnetty.nio.demo01;
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import java.net.InetSocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.channels.SelectionKey;
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import java.nio.channels.Selector;
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import java.nio.channels.ServerSocketChannel;
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import java.nio.channels.SocketChannel;
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import java.util.Iterator;
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import java.util.Set;
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/**
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* @author LuoHaiYang
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*/
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public class NIOServer {
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public static void main(String[] args) throws Exception {
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// 创建ServerSocketChannel -> ServerSocket
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ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
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// 得到一个Selector对象
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Selector selector = Selector.open();
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// 绑定一个端口：6666，在服务端监听
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serverSocketChannel.socket().bind(new InetSocketAddress(6666));
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// 设置为非阻塞
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serverSocketChannel.configureBlocking(false);
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// 把ServerSocketChannel注册到selector， 事件为：OP_ACCEPT
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SelectionKey registerSelectionKey = serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
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System.out.println("Register to selector, selectionKey is OP_ACCEPT, return selectionKey = " + registerSelectionKey + ", 注册后selectionKey 数量 = " + selector.keys().size());
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// 循环等待客户端连接
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while (true) {
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// 这里我们等待1秒， 如果没有事件发生，返回
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if (selector.select(1000) == 0) {
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// 没有事件发生
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System.out.println("服务器等待了1秒，无连接");
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continue;
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}
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// 如果返回结果 > 0, 就获取到相关的selectionKey集合
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// 1. 如果返回 > 0，表示已经获取到关注的事件
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// 2. selector.selectedKeys() 返回关注事件的集合
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// 通过selectionKeys反向获取通道
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Set<SelectionKey> selectionKeys = selector.selectedKeys();
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// 通过迭代器遍历Set<SelectionKey>
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Iterator<SelectionKey> keyIterator = selectionKeys.iterator();
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while (keyIterator.hasNext()) {
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// 获取Selectionkey
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SelectionKey key = keyIterator.next();
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// 根据key对应的通道发生的事件做响应处理
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if (key.isAcceptable()) {
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// 如果key是OP_ACCEPT，有新的客户端连接
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// 通过ServerSocketChannel生成一个socketChannel
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SocketChannel socketChannel = serverSocketChannel.accept();
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System.out.println("Register to selector, selectionKey is OP_ACCEPT, return selectionKey = " + registerSelectionKey + ", 注册后selectionKey 数量 = " + selector.keys().size());
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// 将SocketChannel设置为非阻塞
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socketChannel.configureBlocking(false);
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// 将socketChannel注册到selector，关注事件为OP_READ，同时给socketChannel关联一个buffer
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socketChannel.register(selector, SelectionKey.OP_READ, ByteBuffer.allocate(1024));
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}
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System.out.println("isReadable = " + key.isReadable() + ", isWritable = " + key.isWritable() + ", isValid = " + key.isValid());
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if (key.isReadable()) {
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// 如果key是OP_READ
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// 通过key反向获取到对应channel
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SocketChannel channel = (SocketChannel) key.channel();
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// 获取该channel关联的buffer
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ByteBuffer buffer = (ByteBuffer)key.attachment();
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// 从buffer中读取数据到channel中
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channel.read(buffer);
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System.out.println("from 客户端 " + new String(buffer.array()));
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}
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// 手动从集合中移动当前的selectionKey，防止重复操作
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keyIterator.remove();
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}
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}
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}
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}

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