AIO：简单代码示例

﹏ヽ暗。殇╰゛Y 2023-06-27 05:42 4阅读 0赞

AIO目前使用并不多，只做代码示例...

*  服务端代码

package com.self.netty.aio;
    
    import java.io.IOException;
    import java.net.InetSocketAddress;
    import java.nio.ByteBuffer;
    import java.nio.channels.AsynchronousChannelGroup;
    import java.nio.channels.AsynchronousServerSocketChannel;
    import java.nio.channels.AsynchronousSocketChannel;
    import java.nio.channels.CompletionHandler;
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    
    /*** AIO 服务端 */
    public class AIOServer {
        private final int port;
    
        public static void main(String args[]) {
            int port = 8000;
            new AIOServer(port);
        }
    
        public AIOServer(int port) {
            this.port = port;
            listen();
        }
    
        private void listen() {
            try {
                ExecutorService executorService = Executors.newCachedThreadPool();
                // 工作线程, 用来进行回调, 事件响应时候进行回调
                AsynchronousChannelGroup threadGroup = AsynchronousChannelGroup.withCachedThreadPool(executorService, 1);
                final AsynchronousServerSocketChannel server = AsynchronousServerSocketChannel.open(threadGroup);
                server.bind(new InetSocketAddress(port));
                System.out.println("服务已启动，监听端口" + port);
                // 准备接收数据
                server.accept(null, new CompletionHandler<AsynchronousSocketChannel, Object>() {
                    final ByteBuffer buffer = ByteBuffer.allocateDirect(1024);
                    // 实现 Completed 方法, 进行回调
                    public void completed(AsynchronousSocketChannel result, Object attachment) {
                        System.out.println("IO 操作成功，开始获取数据");
                        try {
                            buffer.clear();
                            result.read(buffer).get();
                            buffer.flip();
                            result.write(buffer);
                            buffer.flip();
                        } catch (Exception e) {
                            System.out.println(e.toString());
                        } finally {
                            try {
                                result.close();
                                server.accept(null, this);
                            } catch (Exception e) {
                                System.out.println(e.toString());
                            }
                        }
                        System.out.println("操作完成");
                    }
    
                    @Override
                    public void failed(Throwable exc, Object attachment) {
                        System.out.println("IO 操作是失败: " + exc);
                    }
                });
                try {
                    Thread.sleep(Integer.MAX_VALUE);
                } catch (InterruptedException ex) {
                    ex.printStackTrace();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

*  客户端代码

package com.self.netty.aio;
    
    import java.net.InetSocketAddress;
    import java.nio.ByteBuffer;
    import java.nio.channels.AsynchronousSocketChannel;
    import java.nio.channels.CompletionHandler;
    
    /**
     * @author pj_zhang
     * @create 2019-11-12 22:43
     **/
    public class AIOClient {
    
        private final AsynchronousSocketChannel client;
    
        public AIOClient() throws Exception {
            client = AsynchronousSocketChannel.open();
        }
    
        public void connect(String host, int port) throws Exception {
            client.connect(new InetSocketAddress(host, port), null, new CompletionHandler<Void, Void>() {
                @Override
                public void completed(Void result, Void attachment) {
                    try {
                        client.write(ByteBuffer.wrap("这是一条测试数据".getBytes())).get();
                        System.out.println("已发送至服务器");
                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                }
    
                @Override
                public void failed(Throwable exc, Void attachment) {
                    exc.printStackTrace();
                }
            });
            final ByteBuffer bb = ByteBuffer.allocate(1024);
            client.read(bb, null, new CompletionHandler<Integer, Object>() {
                @Override
                public void completed(Integer result, Object attachment) {
                    System.out.println("IO 操作完成" + result);
                    System.out.println("获取反馈结果" + new String(bb.array()));
                }
    
                @Override
                public void failed(Throwable exc, Object attachment) {
                    exc.printStackTrace();
                }
            });
            try {
                Thread.sleep(Integer.MAX_VALUE);
            } catch (InterruptedException ex) {
                ex.printStackTrace();
            }
        }
    
        public static void main(String args[]) throws Exception {
            new AIOClient().connect("localhost", 8000);
        }
    
    }