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本篇内容主要讲解“netty的怎么实现及运用到gmq中”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“netty的怎么实现及运用到gmq中”吧!
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书接上文手写MQ框架（三）-客户端实现 ，前面通过web的形式实现了mq的服务端和客户端，现在计划使用netty来改造一下。前段时间学习了一下netty的使用。大概有一些想法。
netty封装了socket的使用，我们通过简单的调用即可构建高性能的网络应用。我计划采用以下例子来对gmq进行改造。
Netty是由JBOSS提供的一个java开源框架。Netty提供异步的、事件驱动的网络应用程序框架和工具，用以快速开发高性能、高可靠性的网络服务器和客户端程序。
netty是一个java框架，是网络编程框架，支持异步、事件驱动的特性，所以性能表现很好。
Handler是处理器，handler 是由 Netty 生成用来处理 I/O 事件的。
package me.lovegao.netty.learnw3c.mqdemo; import io.netty.channel.Channel; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.channel.group.ChannelGroup; import io.netty.channel.group.DefaultChannelGroup; import io.netty.util.concurrent.GlobalEventExecutor; public class SimpleServerHandler extends SimpleChannelInboundHandler{ public static ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE); @Override public void handlerAdded(ChannelHandlerContext ctx) throws Exception { Channel incoming = ctx.channel(); System.out.println("[SERVER] - " + incoming.remoteAddress() + " 加入\n"); channels.add(ctx.channel()); } @Override public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { Channel incoming = ctx.channel(); System.out.println("[SERVER] - " + incoming.remoteAddress() + " 离开\n"); channels.remove(ctx.channel()); } @Override protected void channelRead0(ChannelHandlerContext ctx, String s) throws Exception { Channel incoming = ctx.channel(); System.out.println("[" + incoming.remoteAddress() + "]" + s); if(s == null || s.length() == 0) { incoming.writeAndFlush("消息是空的呀！\n"); } else { // MqRouter mqRouter = JSONObject.parseObject(s, MqRouter.class); // System.out.println(mqRouter.getUri()); String responseMsg = "收到了，" + s + "\n"; incoming.writeAndFlush(responseMsg); } } @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { Channel incoming = ctx.channel(); System.out.println("SimpleChatClient:"+incoming.remoteAddress()+"在线"); } @Override public void channelInactive(ChannelHandlerContext ctx) throws Exception { Channel incoming = ctx.channel(); System.out.println("SimpleChatClient:"+incoming.remoteAddress()+"掉线"); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { Channel incoming = ctx.channel(); System.out.println("SimpleChatClient:"+incoming.remoteAddress()+"异常"); cause.printStackTrace(); ctx.close(); } }
SimpleServerInitializer 用来增加多个的处理类到 ChannelPipeline 上，包括编码、解码、SimpleServerHandler 等。
package me.lovegao.netty.learnw3c.mqdemo; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelPipeline; import io.netty.channel.socket.SocketChannel; import io.netty.handler.codec.DelimiterBasedFrameDecoder; import io.netty.handler.codec.Delimiters; import io.netty.handler.codec.string.StringDecoder; import io.netty.handler.codec.string.StringEncoder; public class SimpleServerInitializer extends ChannelInitializer{ @Override protected void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch.pipeline(); pipeline.addLast("framer", new DelimiterBasedFrameDecoder(8192, Delimiters.lineDelimiter())); pipeline.addLast("decoder", new StringDecoder()); pipeline.addLast("encoder", new StringEncoder()); pipeline.addLast("handler", new SimpleServerHandler()); System.out.println("SimpleChatClient:" + ch.remoteAddress() + "连接上"); } }
package me.lovegao.netty.learnw3c.mqdemo;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
public class SimpleServer {
private int port;
public SimpleServer(int port) {
this.port = port;
}
public void run() throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
.childHandler(new SimpleServerInitializer()).option(ChannelOption.SO_BACKLOG, 128)
.childOption(ChannelOption.SO_KEEPALIVE, true);
System.out.println("SimpleChatServer 启动了");
ChannelFuture f = b.bind(port).sync();
f.channel().closeFuture().sync();
} finally {
workerGroup.shutdownGracefully();
bossGroup.shutdownGracefully();
System.out.println("SimpleChatServer 关闭了");
}
}
public static void main(String[] args) throws Exception {
int port;
if (args.length > 0) {
port = Integer.parseInt(args[0]);
} else {
port = 8080;
}
new SimpleServer(port).run();
}
}package me.lovegao.netty.learnw3c.mqdemo; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; public class SimpleClientHandler extends SimpleChannelInboundHandler{ @Override protected void channelRead0(ChannelHandlerContext ctx, String s) throws Exception { System.out.println("收到的信息：" + s); } }
package me.lovegao.netty.learnw3c.mqdemo; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelPipeline; import io.netty.channel.socket.SocketChannel; import io.netty.handler.codec.DelimiterBasedFrameDecoder; import io.netty.handler.codec.Delimiters; import io.netty.handler.codec.string.StringDecoder; import io.netty.handler.codec.string.StringEncoder; public class SimpleClientInitializer extends ChannelInitializer{ @Override protected void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch.pipeline(); pipeline.addLast("framer", new DelimiterBasedFrameDecoder(8192, Delimiters.lineDelimiter())); pipeline.addLast("decoder", new StringDecoder()); pipeline.addLast("encoder", new StringEncoder()); pipeline.addLast("handler", new SimpleClientHandler()); } }
package me.lovegao.netty.learnw3c.mqdemo;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
public class SimpleClient {
private final String host;
private final int port;
public SimpleClient(String host, int port) {
this.host = host;
this.port = port;
}
public static void main(String[] args) throws Exception {
new SimpleClient("localhost", 8080).run();
}
public void run() throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap bootstrap = new Bootstrap()
.group(group)
.channel(NioSocketChannel.class)
.handler(new SimpleClientInitializer());
Channel channel = bootstrap.connect(host, port).sync().channel();
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
while(true) {
String line = in.readLine();
if(line.equals("exit!")) {
break;
}
channel.writeAndFlush(line + "\r\n");
}
} catch(Exception e) {
e.printStackTrace();
} finally {
group.shutdownGracefully();
}
}
}在我把教程上的代码略微改了一下，测试时发现客户端能够发出消息，服务端能够收到消息，服务端也走到了回复客户端的流程，但是客户端却收不到消息。还原代码后是正常的，想了半天，最后才发现是改代码的的时候漏掉了“\n”这个标识，以此导致客户端始终不打印消息。
netty只封装了网络交互，gmq整体使用了gmvc框架，而gmvc框架目前还无法脱离servlet。而我又不太想把之前写的代码全部改为自己new的方式。
1）改造gmvc框架
对gmvc框架进行重构，使得能够脱离servlet使用。也就是将IOC功能剥离开。
优点：一步到位，符合整体的规划。
缺点：gmq的迭代会延迟一段时间。
2）暂时抛弃gmvc框架
暂时将目前依赖的gmvc框架给去除掉，优先完成gmq的迭代。待后期gmvc框架改造完成后再进行改造。
优点：能够尽早的完成gmq的功能。
缺点：先移除框架，后期再套上框架，相当于做了两次多余的功。费时费力。
到此，相信大家对“netty的怎么实现及运用到gmq中”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！