Netty是Trustin Lee在2004年开发的一款高性能的网络应用程序框架。相比于JDK自带的NIO，Netty做了相当多的增强，且隔离了jdk nio的实现细节，API也比较友好，还支持流量整形等高级特性。在我们常见的一些开源项目中已经普遍的应用到了Netty，比如Dubbo、Elasticsearch、Zookeeper等。
#### Netty的具体开发
提示：因代码相对较多，这里只展示其主要部分，至于项目中用到的编解码器、工具类，请直接拉到最后下载源码！也欢迎顺手给个Star～
##### 需要的依赖
```xml
```
##### Client端代码
```java
package com.example.nettydemo.client;
import com.example.nettydemo.client.codec.*;
import com.example.nettydemo.client.codec.dispatcher.OperationResultFuture;
import com.example.nettydemo.client.codec.dispatcher.RequestPendingCenter;
import com.example.nettydemo.client.codec.dispatcher.ResponseDispatcherHandler;
import com.example.nettydemo.common.RequestMessage;
import com.example.nettydemo.common.string.StringOperation;
import com.example.nettydemo.util.IdUtil;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioChannelOption;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import javax.net.ssl.SSLException;
import java.util.concurrent.ExecutionException;
public class Client {
public static void main(String[] args) throws InterruptedException, ExecutionException, SSLException {
Bootstrap bootstrap = new Bootstrap();
bootstrap.channel(NioSocketChannel.class);
//客户端连接服务器最大允许时间，默认为30s
bootstrap.option(NioChannelOption.CONNECT_TIMEOUT_MILLIS, 30 * 1000); //10s
NioEventLoopGroup group = new NioEventLoopGroup();
try {
bootstrap.group(group);
RequestPendingCenter requestPendingCenter = new RequestPendingCenter();
LoggingHandler loggingHandler = new LoggingHandler(LogLevel.INFO);
bootstrap.handler(new ChannelInitializer
