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add io demo

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ehlxr 2021-01-24 12:38:01 +08:00
parent 9f67ff8657
commit fb31a4739c
3 changed files with 246 additions and 0 deletions
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95
src/main/java/io/github/ehlxr/io/BioServer.java Normal file
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/*
* The MIT License (MIT)
*
* Copyright © 2020 xrv <xrg@live.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package io.github.ehlxr.io;
import org.apache.commons.io.IOUtils;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.charset.StandardCharsets;
/**
* @author ehlxr
* @since 2021-01-23 20:07.
*/
public class BioServer {
public static void main(String[] args) throws IOException {
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
// 监听 8080 端口进来的 TCP 链接
serverSocketChannel.socket().bind(new InetSocketAddress(8080));
//noinspection InfiniteLoopStatement
while (true) {
// 这里会阻塞，直到有一个请求的连接进来
SocketChannel socketChannel = serverSocketChannel.accept();
// 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
SocketHandler handler = new SocketHandler(socketChannel);
//noinspection AlibabaAvoidManuallyCreateThread
new Thread(handler).start();
}
}
static class SocketHandler implements Runnable {
private final SocketChannel socketChannel;
public SocketHandler(SocketChannel socketChannel) {
this.socketChannel = socketChannel;
}
@Override
public void run() {
ByteBuffer buffer = ByteBuffer.allocate(1024);
try {
// 将请求数据读入 Buffer 中
int num;
while ((num = socketChannel.read(buffer)) > 0) {
// 读取 Buffer 内容之前先 flip 一下
buffer.flip();
// 提取 Buffer 中的数据
byte[] bytes = new byte[num];
buffer.get(bytes);
String re = new String(bytes, StandardCharsets.UTF_8);
System.out.println("收到请求：" + re);
// 回应客户端
ByteBuffer writeBuffer = ByteBuffer.wrap(("我已经收到你的请求，你的请求内容是：" + re).getBytes());
socketChannel.write(writeBuffer);
buffer.clear();
}
} catch (IOException e) {
IOUtils.closeQuietly(socketChannel);
}
}
}
}

59
src/main/java/io/github/ehlxr/io/Client.java Normal file
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/*
* The MIT License (MIT)
*
* Copyright © 2020 xrv <xrg@live.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package io.github.ehlxr.io;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.nio.charset.StandardCharsets;
/**
* @author ehlxr
* @since 2021-01-23 20:09.
*/
public class Client {
public static void main(String[] args) throws IOException {
SocketChannel socketChannel = SocketChannel.open();
socketChannel.connect(new InetSocketAddress("localhost", 8080));
// 发送请求
ByteBuffer buffer = ByteBuffer.wrap("1234567890".getBytes());
socketChannel.write(buffer);
// 读取响应
ByteBuffer readBuffer = ByteBuffer.allocate(1024);
int num;
if ((num = socketChannel.read(readBuffer)) > 0) {
readBuffer.flip();
byte[] re = new byte[num];
readBuffer.get(re);
String result = new String(re, StandardCharsets.UTF_8);
System.out.println("返回值: " + result);
}
}
}

92
src/main/java/io/github/ehlxr/io/SelectorServer.java Normal file
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/*
* The MIT License (MIT)
*
* Copyright © 2020 xrv <xrg@live.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package io.github.ehlxr.io;
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;
import java.util.Set;
/**
* @author ehlxr
* @since 2021-01-23 20:18.
*/
public class SelectorServer {
public static void main(String[] args) throws IOException {
Selector selector = Selector.open();
ServerSocketChannel server = ServerSocketChannel.open();
server.socket().bind(new InetSocketAddress(8080));
// 将其注册到 Selector 中，监听 OP_ACCEPT 事件
server.configureBlocking(false);
server.register(selector, SelectionKey.OP_ACCEPT);
//noinspection InfiniteLoopStatement
while (true) {
int readyChannels = selector.select();
if (readyChannels == 0) {
continue;
}
Set<SelectionKey> readyKeys = selector.selectedKeys();
// 遍历
Iterator<SelectionKey> iterator = readyKeys.iterator();
while (iterator.hasNext()) {
SelectionKey key = iterator.next();
iterator.remove();
if (key.isAcceptable()) {
// 有已经接受的新的到服务端的连接
SocketChannel socketChannel = server.accept();
// 有新的连接并不代表这个通道就有数据，
// 这里将这个新的 SocketChannel 注册到 Selector，监听 OP_READ 事件，等待数据
socketChannel.configureBlocking(false);
socketChannel.register(selector, SelectionKey.OP_READ);
} else if (key.isReadable()) {
// 有数据可读
// 上面一个 if 分支中注册了监听 OP_READ 事件的 SocketChannel
SocketChannel socketChannel = (SocketChannel) key.channel();
ByteBuffer readBuffer = ByteBuffer.allocate(1024);
int num = socketChannel.read(readBuffer);
if (num > 0) {
// 处理进来的数据...
System.out.println("收到数据：" + new String(readBuffer.array()).trim());
ByteBuffer buffer = ByteBuffer.wrap("返回给客户端的数据...".getBytes());
socketChannel.write(buffer);
} else if (num == -1) {
// -1 代表连接已经关闭
socketChannel.close();
}
}
}
}
}
}