（中级篇 NettyNIO编解码开发）第十章-Http协议开发应用（基于Netty的HttpServer和HttpClient的简单实现）

1.HttpServer

 1 package nettyHttpTest;
 2
 3
 4
 5 import io.netty.bootstrap.ServerBootstrap;
 6 import io.netty.channel.ChannelFuture;
 7 import io.netty.channel.ChannelInitializer;
 8 import io.netty.channel.ChannelOption;
 9 import io.netty.channel.EventLoopGroup;
10 import io.netty.channel.nio.NioEventLoopGroup;
11 import io.netty.channel.socket.SocketChannel;
12 import io.netty.channel.socket.nio.NioServerSocketChannel;
13 import io.netty.handler.codec.http.HttpRequestDecoder;
14 import io.netty.handler.codec.http.HttpResponseEncoder;
15
16 public class HttpServer {
17
18
19
20     public void start(int port) throws Exception {
21         EventLoopGroup bossGroup = new NioEventLoopGroup();
22         EventLoopGroup workerGroup = new NioEventLoopGroup();
23         try {
24             ServerBootstrap b = new ServerBootstrap();
25             b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
26                     .childHandler(new ChannelInitializer<SocketChannel>() {
27                                 @Override
28                                 public void initChannel(SocketChannel ch) throws Exception {
29                                     // server端发送的是httpResponse，所以要使用HttpResponseEncoder进行编码
30                                     ch.pipeline().addLast(new HttpResponseEncoder());
31                                     // server端接收到的是httpRequest，所以要使用HttpRequestDecoder进行解码
32                                     ch.pipeline().addLast(new HttpRequestDecoder());
33                                     ch.pipeline().addLast(new HttpServerInboundHandler());
34                                 }
35                             }).option(ChannelOption.SO_BACKLOG, 128)
36                     .childOption(ChannelOption.SO_KEEPALIVE, true);
37
38             ChannelFuture f = b.bind(port).sync();
39
40             f.channel().closeFuture().sync();
41         } finally {
42             workerGroup.shutdownGracefully();
43             bossGroup.shutdownGracefully();
44         }
45     }
46
47     public static void main(String[] args) throws Exception {
48         HttpServer server = new HttpServer();
49         System.out.println("Http Server listening on 8844 ...");
50         server.start(8844);
51     }
52 }

2.HttpServerInboundHandler

 1 package nettyHttpTest;
 2
 3
 4
 5 import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
 6 import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_LENGTH;
 7 import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
 8 import static io.netty.handler.codec.http.HttpResponseStatus.OK;
 9 import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
10
11 import io.netty.buffer.ByteBuf;
12 import io.netty.buffer.Unpooled;
13 import io.netty.channel.ChannelHandlerAdapter;
14 import io.netty.channel.ChannelHandlerContext;
15 import io.netty.handler.codec.http.DefaultFullHttpResponse;
16 import io.netty.handler.codec.http.FullHttpResponse;
17 import io.netty.handler.codec.http.HttpContent;
18 import io.netty.handler.codec.http.HttpHeaders;
19 import io.netty.handler.codec.http.HttpHeaders.Values;
20 import io.netty.handler.codec.http.HttpRequest;
21
22 public class HttpServerInboundHandler extends ChannelHandlerAdapter {
23
24
25
26     private HttpRequest request;
27
28     @Override
29     public void channelRead(ChannelHandlerContext ctx, Object msg)
30             throws Exception {
31         if (msg instanceof HttpRequest) {
32             request = (HttpRequest) msg;
33
34             String uri = request.getUri();
35             System.out.println("Uri:" + uri);
36         }
37         if (msg instanceof HttpContent) {
38             HttpContent content = (HttpContent) msg;
39             ByteBuf buf = content.content();
40             System.out.println(buf.toString(io.netty.util.CharsetUtil.UTF_8));
41             buf.release();
42
43             String res = "I am OK";
44             FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1,
45                     OK, Unpooled.wrappedBuffer(res.getBytes("UTF-8")));
46             response.headers().set(CONTENT_TYPE, "text/plain");
47             response.headers().set(CONTENT_LENGTH,
48                     response.content().readableBytes());
49             if (HttpHeaders.isKeepAlive(request)) {
50                 response.headers().set(CONNECTION, Values.KEEP_ALIVE);
51             }
52             ctx.write(response);
53             ctx.flush();
54         }
55     }
56
57     @Override
58     public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
59         ctx.flush();
60     }
61
62     @Override
63     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
64         System.out.println(cause.getMessage());
65         ctx.close();
66     }
67
68 }

3.HttpClient

 1 package nettyHttpTest;
 2
 3 import io.netty.bootstrap.Bootstrap;
 4 import io.netty.buffer.Unpooled;
 5 import io.netty.channel.ChannelFuture;
 6 import io.netty.channel.ChannelInitializer;
 7 import io.netty.channel.ChannelOption;
 8 import io.netty.channel.EventLoopGroup;
 9 import io.netty.channel.nio.NioEventLoopGroup;
10 import io.netty.channel.socket.SocketChannel;
11 import io.netty.channel.socket.nio.NioSocketChannel;
12 import io.netty.handler.codec.http.DefaultFullHttpRequest;
13 import io.netty.handler.codec.http.HttpHeaders;
14 import io.netty.handler.codec.http.HttpMethod;
15 import io.netty.handler.codec.http.HttpRequestEncoder;
16 import io.netty.handler.codec.http.HttpResponseDecoder;
17 import io.netty.handler.codec.http.HttpVersion;
18
19 import java.net.URI;
20
21 public class HttpClient {
22     public void connect(String host, int port) throws Exception {
23         EventLoopGroup workerGroup = new NioEventLoopGroup();
24
25         try {
26             Bootstrap b = new Bootstrap();
27             b.group(workerGroup);
28             b.channel(NioSocketChannel.class);
29             b.option(ChannelOption.SO_KEEPALIVE, true);
30             b.handler(new ChannelInitializer<SocketChannel>() {
31                 @Override
32                 public void initChannel(SocketChannel ch) throws Exception {
33                     // 客户端接收到的是httpResponse响应，所以要使用HttpResponseDecoder进行解码
34                     ch.pipeline().addLast(new HttpResponseDecoder());
35                     // 客户端发送的是httprequest，所以要使用HttpRequestEncoder进行编码
36                     ch.pipeline().addLast(new HttpRequestEncoder());
37                     ch.pipeline().addLast(new HttpClientInboundHandler());
38                 }
39             });
40
41             // Start the client.
42             ChannelFuture f = b.connect(host, port).sync();
43
44             URI uri = new URI("http://127.0.0.1:8844");
45             String msg = "Are you ok?";
46             DefaultFullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET,
47                     uri.toASCIIString(), Unpooled.wrappedBuffer(msg.getBytes("UTF-8")));
48
49             // 构建http请求
50             request.headers().set(HttpHeaders.Names.HOST, host);
51             request.headers().set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
52             request.headers().set(HttpHeaders.Names.CONTENT_LENGTH, request.content().readableBytes());
53             // 发送http请求
54             f.channel().write(request);
55             f.channel().flush();
56             f.channel().closeFuture().sync();
57         } finally {
58             workerGroup.shutdownGracefully();
59         }
60
61     }
62
63     public static void main(String[] args) throws Exception {
64         HttpClient client = new HttpClient();
65         client.connect("127.0.0.1", 8844);
66     }
67 }

4.HttpClientInboundHandler

 1 package nettyHttpTest;
 2
 3 import io.netty.buffer.ByteBuf;
 4 import io.netty.channel.ChannelHandlerAdapter;
 5 import io.netty.channel.ChannelHandlerContext;
 6 import io.netty.handler.codec.http.HttpContent;
 7 import io.netty.handler.codec.http.HttpHeaders;
 8 import io.netty.handler.codec.http.HttpResponse;
 9
10 public class HttpClientInboundHandler extends ChannelHandlerAdapter {
11
12     @Override
13     public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
14         if (msg instanceof HttpResponse)
15         {
16             HttpResponse response = (HttpResponse) msg;
17             System.out.println("CONTENT_TYPE:" + response.headers().get(HttpHeaders.Names.CONTENT_TYPE));
18         }
19         if(msg instanceof HttpContent)
20         {
21             HttpContent content = (HttpContent)msg;
22             ByteBuf buf = content.content();
23             System.out.println(buf.toString(io.netty.util.CharsetUtil.UTF_8));
24             buf.release();
25         }
26     }
27 }

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