Netty的http服务器编程(三)

Netty提供的handler：HttpServerCodec http 请求编解码处理类

第一个netty的例子，，server服务端的编写，客户端使用 curl ： http://IP:PORT请求 

服务启动类

 1 public class TestServer {
 2
 3     public static void main(String[] args) throws Exception {
 4
 5         //定义两个线程组
 6         EventLoopGroup bossGroup = new NioEventLoopGroup();//接收连接,分发给worker
 7         EventLoopGroup workerGroup = new NioEventLoopGroup();//处理连接
 8
 9         try{
10             //启动服务器  ： 简化服务端启动
11             ServerBootstrap serverBootstrap = new ServerBootstrap();
12             serverBootstrap.group(bossGroup,workerGroup)
13                     .channel(NioServerSocketChannel.class)
14                     .childHandler(new TestServerInitializer());//子处理器
15
16             //绑定端口
17             ChannelFuture channelFuture = serverBootstrap.bind(8899).sync();
18             channelFuture.channel().closeFuture().sync();
19         }finally {
20
21             //优雅关闭线程组
22             bossGroup.shutdownGracefully();
23             workerGroup.shutdownGracefully();
24         }
25
26
27
28     }
29
30
31 }

初始化类 ：

 1 public class TestServerInitializer extends ChannelInitializer<SocketChannel> {
 2
 3     @Override
 4     protected void initChannel(SocketChannel ch) throws Exception {
 5         //拦截器
 6         ChannelPipeline pipeline = ch.pipeline();
 7         //注册拦截器
 8         pipeline.addLast("httpServerCodec",new HttpServerCodec());//请求编解码
 9         pipeline.addLast("testHttpServerHandler",new TestHttpServerHandler());
10     }
11 }

自定义处理器类：

 1 public class TestHttpServerHandler  extends SimpleChannelInboundHandler<HttpObject> {
 2
 3     //读取客户端的请求，向客户端返回响应的方法
 4     //计划在5.0 改名 messagereceived  消息接收，5.0已废弃
 5     @Override
 6     protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
 7
 8         System.out.println(msg.getClass());
 9
10         System.out.println(ctx.channel().remoteAddress());
11
12         Thread.sleep(8000);
13
14         if(msg instanceof HttpRequest){
15             HttpRequest httpRequest = (HttpRequest)msg;
16
17             System.out.println("请求方法名："+httpRequest.getMethod().name());
18
19             URI uri = new URI(httpRequest.getUri());
20             if("/favicon.ico".equals(uri.getPath())){
21                 System.out.println("请求favicon.ico");
22                 return;
23             }
24             //构造响应内容
25             ByteBuf content = Unpooled.copiedBuffer("hello world", CharsetUtil.UTF_8);
26
27             FullHttpResponse response = new DefaultFullHttpResponse(
28                     HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
29
30             response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");
31             response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());
32
33
34             //返回响应
35             ctx.writeAndFlush(response);
36             ctx.close();
37         }
38
39     }
40
41     @Override
42     public void channelActive(ChannelHandlerContext ctx) throws Exception {
43         System.out.println("channel active");
44         super.channelActive(ctx);
45     }
46
47     @Override
48     public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
49         System.out.println("channel registered");
50         super.channelRegistered(ctx);
51     }
52
53     @Override
54     public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
55         System.out.println("handler added");
56         super.handlerAdded(ctx);
57     }
58
59     @Override
60     public void channelInactive(ChannelHandlerContext ctx) throws Exception {
61         System.out.println("channel inactive");
62         super.channelInactive(ctx);
63     }
64
65     @Override
66     public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
67         System.out.println("channel unregistered");
68         super.channelUnregistered(ctx);
69     }
70 }