Question

如何构建一个基于netty的后端服务器

Answer 1

HttpRequestHandler -- HTTP请求处理类
TextWebSocketFrameHandler -- 对应Text消息的处理类
WebSocketServer -- 系统主类
WebSocketServerInitializer -- 服务主程序的初始化类
WebSocketServer 类代码：
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 final class WebSocketServer {
private int port = 0;
public WebSocketServer(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 WebSocketServerInitializer())
.option(ChannelOption.SO_BACKLOG, 128)
.childOption(ChannelOption.SO_KEEPALIVE, true);

System.out.println("WebsocketChatServer 启动了");
// 绑定端口，开始接收进来的连接
ChannelFuture f = b.bind(port).sync();
// 等待服务器 socket 关闭 。在这个例子中，这不会发生，但你可以优雅地关闭你的服务器。
f.channel().closeFuture().sync();
} finally {
workerGroup.shutdownGracefully();
bossGroup.shutdownGracefully();
System.out.println("WebsocketChatServer 关闭了");
}
}