一个简单的Mina的UDP实现_mina udp样例-优快云博客

本文链接：https://blog.youkuaiyun.com/sustbeckham/article/details/6573612

本文详细介绍了使用Apache Mina框架实现UDP服务器端与客户端之间的通信流程，包括服务器端的初始化、过滤器配置、地址复用及客户端的连接、消息发送与接收。通过实例代码展示了如何正确跟踪内存使用情况。

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根据Mina的官方例子修改而来。

server端：

client端:

/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * */ package com.taobao.mina.myudp.client; import java.net.InetSocketAddress; import java.nio.charset.Charset; import java.nio.charset.CharsetDecoder; import org.apache.mina.core.buffer.IoBuffer; import org.apache.mina.core.future.ConnectFuture; import org.apache.mina.core.future.IoFutureListener; import org.apache.mina.core.service.IoConnector; import org.apache.mina.core.service.IoHandlerAdapter; import org.apache.mina.core.session.IdleStatus; import org.apache.mina.core.session.IoSession; import org.apache.mina.example.udp.MemoryMonitor; import org.apache.mina.transport.socket.nio.NioDatagramConnector; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Sends its memory usage to the MemoryMonitor server. * 这样的写法将本来可以单独的client写到IoHandlerAdapter 更紧凑 * * @author <a href="http://mina.apache.org" mce_href="http://mina.apache.org">Apache MINA Project</a> */ public class MemMonClient extends IoHandlerAdapter { private final static Logger LOGGER = LoggerFactory.getLogger(MemMonClient.class); private IoSession session; private IoConnector connector; /** * Default constructor. */ public MemMonClient() { connector = new NioDatagramConnector(); connector.setHandler(this); ConnectFuture connFuture = connector.connect(new InetSocketAddress( "localhost", MemoryMonitor.PORT)); // 这样不太好吧 connFuture.awaitUninterruptibly(); // 给conn添加一个监听器 connFuture.addListener(new IoFutureListener<ConnectFuture>() { public void operationComplete(ConnectFuture future) { if (future.isConnected()) { session = future.getSession(); try { sendData(); } catch (InterruptedException e) { e.printStackTrace(); } } else { try { throw new Exception(" 连接错误。 "); } catch (Exception e) { e.printStackTrace(); } } } }); } private void sendData() throws InterruptedException { for (int i = 0; i < 10; i++) { long free = Runtime.getRuntime().freeMemory(); // 得到当前空闲内存大小 IoBuffer buffer = IoBuffer.allocate(8); buffer.putLong(free); // 只把剩余内存大小放入buffer，扔给server buffer.flip(); session.write(buffer); // 写入 try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); throw new InterruptedException(e.getMessage()); } } } @Override public void exceptionCaught(IoSession session, Throwable cause) throws Exception { cause.printStackTrace(); } @Override public void messageReceived(IoSession session, Object message) throws Exception { Charset c = Charset.forName("UTF-8"); CharsetDecoder cd = c.newDecoder(); IoBuffer buffer = (IoBuffer)message; System.out.println("客户端收到来自服务器的消息String:" + (buffer.getString(cd))); } @Override public void messageSent(IoSession session, Object message) throws Exception { System.out.println("客户端向服务器发送信息：" + ((IoBuffer)message).getLong()); } @Override public void sessionClosed(IoSession session) throws Exception { System.out.println("客户端关闭了当前会话"); } @Override public void sessionCreated(IoSession session) throws Exception { System.out.println("客户端成功创建session"); } @Override public void sessionIdle(IoSession session, IdleStatus status) throws Exception { } @Override public void sessionOpened(IoSession session) throws Exception { System.out.println("客户端成功开启一个session id:"+session.getId()); } public static void main(String[] args) { new MemMonClient(); } }