Netty(一)：的入门使用。

Netty的入门基本使用流程代码,不做具体分析。使用版本为Netty 4.x版本。

服务端调用示例：

　　绑定端口号为8080端口

 package com.cllover;

 import com.sun.webkit.EventLoop;
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.nio.NioServerSocketChannel;

 public class Server {
     public static void main(String[] args) {

         //接受连接
         EventLoopGroup parentEventLoopGroup = new NioEventLoopGroup();
         EventLoopGroup childEventLoopGroup = new NioEventLoopGroup();

         try {
             //入口
             ServerBootstrap serverBootstrap = new ServerBootstrap();
             serverBootstrap.group(parentEventLoopGroup,childEventLoopGroup).
                 channel(NioServerSocketChannel.class).childHandler(new Init());
         //绑定运行端口
             ChannelFuture channelFuture = serverBootstrap.bind(8080).sync();
             channelFuture.channel().closeFuture().sync();
         } catch (InterruptedException e) {
             e.printStackTrace();
         }finally {
             //连接关闭
             parentEventLoopGroup.shutdownGracefully();
             childEventLoopGroup.shutdownGracefully();
         }

     }
 }

Init：初始化类

 package com.cllover;

 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelPipeline;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.handler.codec.http.HttpServerCodec;

 public class Init extends ChannelInitializer<SocketChannel> {

     @Override
     protected void initChannel(SocketChannel ch) throws Exception {
         ChannelPipeline pipeline = ch.pipeline();
         pipeline.addLast("httpServerCode",new HttpServerCodec());
         pipeline.addLast("httpServerHandler",new HttpServerHandler());

     }
 }

HttpServerHandler：自定义服务端处理器

 package com.cllover;

 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.SimpleChannelInboundHandler;
 import io.netty.handler.codec.http.*;
 import io.netty.util.CharsetUtil;

 public class HttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

     /*
     * 数据处理方法
     * */
     @Override
     protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {

         if (msg instanceof HttpRequest) {
             ByteBuf byteBuf = Unpooled.copiedBuffer("Hello World!", CharsetUtil.UTF_8);
             FullHttpResponse fullHttpResponse = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,
                     HttpResponseStatus.OK, byteBuf);
 
　　　　　　　　//加入头信息
             fullHttpResponse.headers().set(HttpHeaderNames.ACCEPT_CHARSET, "UTF_8");
             fullHttpResponse.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
             fullHttpResponse.headers().set(HttpHeaderNames.CONTENT_LENGTH, byteBuf.readableBytes());
             ctx.writeAndFlush(fullHttpResponse);
         }
     }
 }

运行方式：

1. 在本机windows/子系统linux上输入:curl locaclhost:8080

　　2.在浏览器输入localhost：8080

头信息：