Netty(一)：netty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

 1 package com.cllover;
 2 
 3 import com.sun.webkit.EventLoop;
 4 import io.netty.bootstrap.ServerBootstrap;
 5 import io.netty.channel.ChannelFuture;
 6 import io.netty.channel.EventLoopGroup;
 7 import io.netty.channel.nio.NioEventLoopGroup;
 8 import io.netty.channel.socket.nio.NioServerSocketChannel;
 9 
10 public class Server {
11     public static void main(String[] args) {
12 
13         //接受连接
14         EventLoopGroup parentEventLoopGroup = new NioEventLoopGroup();
15         EventLoopGroup childEventLoopGroup = new NioEventLoopGroup();
16 
17         try {
18             //入口
19             ServerBootstrap serverBootstrap = new ServerBootstrap();
20             serverBootstrap.group(parentEventLoopGroup,childEventLoopGroup).
21                 channel(NioServerSocketChannel.class).childHandler(new Init());
22         //绑定运行端口
23             ChannelFuture channelFuture = serverBootstrap.bind(8080).sync();
24             channelFuture.channel().closeFuture().sync();
25         } catch (InterruptedException e) {
26             e.printStackTrace();
27         }finally {
28             //连接关闭
29             parentEventLoopGroup.shutdownGracefully();
30             childEventLoopGroup.shutdownGracefully();
31         }
32 
33 
34     }
35 }

Init：初始化类

 1 package com.cllover;
 2 
 3 import io.netty.channel.ChannelInitializer;
 4 import io.netty.channel.ChannelPipeline;
 5 import io.netty.channel.socket.SocketChannel;
 6 import io.netty.handler.codec.http.HttpServerCodec;
 7 
 8 public class Init extends ChannelInitializer<SocketChannel> {
 9 
10     @Override
11     protected void initChannel(SocketChannel ch) throws Exception {
12         ChannelPipeline pipeline = ch.pipeline();
13         pipeline.addLast("httpServerCode",new HttpServerCodec());
14         pipeline.addLast("httpServerHandler",new HttpServerHandler());
15 
16     }
17 }

HttpServerHandler：自定义服务端处理器

 1 package com.cllover;
 2 
 3 import io.netty.buffer.ByteBuf;
 4 import io.netty.buffer.Unpooled;
 5 import io.netty.channel.ChannelHandlerContext;
 6 import io.netty.channel.SimpleChannelInboundHandler;
 7 import io.netty.handler.codec.http.*;
 8 import io.netty.util.CharsetUtil;
 9 
10 
11 public class HttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
12 
13     /*
14     * 数据处理方法
15     * */
16     @Override
17     protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
18 
19         if (msg instanceof HttpRequest) {
20             ByteBuf byteBuf = Unpooled.copiedBuffer("Hello World!", CharsetUtil.UTF_8);
21             FullHttpResponse fullHttpResponse = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,
22                     HttpResponseStatus.OK, byteBuf);
23 
　　　　　　　　//加入头信息
24             fullHttpResponse.headers().set(HttpHeaderNames.ACCEPT_CHARSET, "UTF_8");
25             fullHttpResponse.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
26             fullHttpResponse.headers().set(HttpHeaderNames.CONTENT_LENGTH, byteBuf.readableBytes());
27             ctx.writeAndFlush(fullHttpResponse);
28         }
29     }
30 }

运行方式：

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：