使用Netty创建嵌入式服务器

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猴君
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要使用Netty创建一个嵌入式服务器,可以按照以下步骤进行:

  1. 引入Netty依赖
    在项目中添加Netty库的依赖,例如使用Maven或Gradle。

  2. 创建事件循环组
    Netty使用事件循环组来处理通道事件。通常需要两个组,一个用于接收连接(bossGroup),另一个用于处理连接的读写(workerGroup)。

    EventLoopGroup bossGroup = new NioEventLoopGroup(); EventLoopGroup workerGroup = new NioEventLoopGroup();  
  3. 配置服务器引导
    使用ServerBootstrap来配置服务器的参数和通道处理器。

    ServerBootstrap bootstrap = new ServerBootstrap(); bootstrap.group(bossGroup, workerGroup)         .channel(NioServerSocketChannel.class)         .childHandler(new ChannelInitializer<SocketChannel>() {             @Override             public void initChannel(SocketChannel channel) throws Exception {                 channel.pipeline()                         .addLast(new IdleStateHandler(0, 0, 90, TimeUnit.SECONDS))  // 90秒空闲时间                         .addLast(new HttpServerCodec())                         .addLast(new HttpObjectAggregator(5 * 1024 * 1024))  // 最大消息体积5MB                         .addLast(new CustomServerHandler());  // 自定义的处理器             }         })         .childOption(ChannelOption.SO_KEEPALIVE, true);  
  4. 绑定端口并启动服务器
    最后,绑定端口并启动服务器。

    try {     ChannelFuture future = bootstrap.bind(8080).sync();     future.channel().closeFuture().sync(); } finally {     bossGroup.shutdownGracefully();     workerGroup.shutdownGracefully(); }  

以下是一个完整的示例代码:

import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelOption; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; import io.netty.handler.codec.http.HttpObjectAggregator; import io.netty.handler.codec.http.HttpServerCodec; import io.netty.handler.timeout.IdleStateHandler;  public class EmbeddedNettyServer {      public static void main(String[] args) throws Exception {         EventLoopGroup bossGroup = new NioEventLoopGroup();         EventLoopGroup workerGroup = new NioEventLoopGroup();          try {             ServerBootstrap bootstrap = new ServerBootstrap();             bootstrap.group(bossGroup, workerGroup)                     .channel(NioServerSocketChannel.class)                     .childHandler(new ChannelInitializer<SocketChannel>() {                         @Override                         public void initChannel(SocketChannel channel) throws Exception {                             channel.pipeline()                                     .addLast(new IdleStateHandler(0, 0, 90, TimeUnit.SECONDS))                                     .addLast(new HttpServerCodec())                                     .addLast(new HttpObjectAggregator(5 * 1024 * 1024))                                     .addLast(new CustomServerHandler());                         }                     })                     .childOption(ChannelOption.SO_KEEPALIVE, true);              ChannelFuture future = bootstrap.bind(8080).sync();             future.channel().closeFuture().sync();         } finally {             bossGroup.shutdownGracefully();             workerGroup.shutdownGracefully();         }     } }  

请注意,CustomServerHandler是需要实现的类,用于处理具体的业务逻辑。

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