add io demo
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9f67ff8657
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/*
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* The MIT License (MIT)
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*
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* Copyright © 2020 xrv <xrg@live.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package io.github.ehlxr.io;
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import org.apache.commons.io.IOUtils;
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import java.io.IOException;
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import java.net.InetSocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.channels.ServerSocketChannel;
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import java.nio.channels.SocketChannel;
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import java.nio.charset.StandardCharsets;
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/**
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* @author ehlxr
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* @since 2021-01-23 20:07.
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*/
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public class BioServer {
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public static void main(String[] args) throws IOException {
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ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
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// 监听 8080 端口进来的 TCP 链接
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serverSocketChannel.socket().bind(new InetSocketAddress(8080));
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//noinspection InfiniteLoopStatement
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while (true) {
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// 这里会阻塞，直到有一个请求的连接进来
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SocketChannel socketChannel = serverSocketChannel.accept();
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// 开启一个新的线程来处理这个请求，然后在 while 循环中继续监听 8080 端口
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SocketHandler handler = new SocketHandler(socketChannel);
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//noinspection AlibabaAvoidManuallyCreateThread
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new Thread(handler).start();
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}
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}
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static class SocketHandler implements Runnable {
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private final SocketChannel socketChannel;
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public SocketHandler(SocketChannel socketChannel) {
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this.socketChannel = socketChannel;
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}
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@Override
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public void run() {
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ByteBuffer buffer = ByteBuffer.allocate(1024);
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try {
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// 将请求数据读入 Buffer 中
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int num;
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while ((num = socketChannel.read(buffer)) > 0) {
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// 读取 Buffer 内容之前先 flip 一下
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buffer.flip();
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// 提取 Buffer 中的数据
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byte[] bytes = new byte[num];
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buffer.get(bytes);
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String re = new String(bytes, StandardCharsets.UTF_8);
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System.out.println("收到请求：" + re);
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// 回应客户端
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ByteBuffer writeBuffer = ByteBuffer.wrap(("我已经收到你的请求，你的请求内容是：" + re).getBytes());
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socketChannel.write(writeBuffer);
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buffer.clear();
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}
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} catch (IOException e) {
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IOUtils.closeQuietly(socketChannel);
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}
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}
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}
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}
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@ -0,0 +1,59 @@
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/*
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* The MIT License (MIT)
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*
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* Copyright © 2020 xrv <xrg@live.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package io.github.ehlxr.io;
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import java.io.IOException;
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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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import java.nio.charset.StandardCharsets;
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/**
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* @author ehlxr
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* @since 2021-01-23 20:09.
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*/
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public class Client {
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public static void main(String[] args) throws IOException {
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SocketChannel socketChannel = SocketChannel.open();
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socketChannel.connect(new InetSocketAddress("localhost", 8080));
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// 发送请求
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ByteBuffer buffer = ByteBuffer.wrap("1234567890".getBytes());
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socketChannel.write(buffer);
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// 读取响应
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ByteBuffer readBuffer = ByteBuffer.allocate(1024);
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int num;
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if ((num = socketChannel.read(readBuffer)) > 0) {
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readBuffer.flip();
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byte[] re = new byte[num];
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readBuffer.get(re);
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String result = new String(re, StandardCharsets.UTF_8);
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System.out.println("返回值: " + result);
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}
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}
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}
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@ -0,0 +1,92 @@
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/*
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* The MIT License (MIT)
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*
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* Copyright © 2020 xrv <xrg@live.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package io.github.ehlxr.io;
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import java.io.IOException;
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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 ehlxr
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* @since 2021-01-23 20:18.
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*/
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public class SelectorServer {
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public static void main(String[] args) throws IOException {
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Selector selector = Selector.open();
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ServerSocketChannel server = ServerSocketChannel.open();
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server.socket().bind(new InetSocketAddress(8080));
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// 将其注册到 Selector 中，监听 OP_ACCEPT 事件
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server.configureBlocking(false);
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server.register(selector, SelectionKey.OP_ACCEPT);
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//noinspection InfiniteLoopStatement
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while (true) {
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int readyChannels = selector.select();
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if (readyChannels == 0) {
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continue;
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}
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Set<SelectionKey> readyKeys = selector.selectedKeys();
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// 遍历
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Iterator<SelectionKey> iterator = readyKeys.iterator();
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while (iterator.hasNext()) {
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SelectionKey key = iterator.next();
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iterator.remove();
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if (key.isAcceptable()) {
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// 有已经接受的新的到服务端的连接
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SocketChannel socketChannel = server.accept();
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// 有新的连接并不代表这个通道就有数据，
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// 这里将这个新的 SocketChannel 注册到 Selector，监听 OP_READ 事件，等待数据
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socketChannel.configureBlocking(false);
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socketChannel.register(selector, SelectionKey.OP_READ);
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} else if (key.isReadable()) {
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// 有数据可读
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// 上面一个 if 分支中注册了监听 OP_READ 事件的 SocketChannel
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SocketChannel socketChannel = (SocketChannel) key.channel();
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ByteBuffer readBuffer = ByteBuffer.allocate(1024);
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int num = socketChannel.read(readBuffer);
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if (num > 0) {
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// 处理进来的数据...
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System.out.println("收到数据：" + new String(readBuffer.array()).trim());
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ByteBuffer buffer = ByteBuffer.wrap("返回给客户端的数据...".getBytes());
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socketChannel.write(buffer);
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} else if (num == -1) {
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// -1 代表连接已经关闭
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socketChannel.close();
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}
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}
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}
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}
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}
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}
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