JAVA 网络编程(7) Netty 处理Http协议 示例

maven中使用netty的版本为：

		
			io.netty
			netty-all
			4.1.4.Final
		

示例代码：

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture; 
import io.netty.channel.ChannelInitializer; 
import io.netty.channel.ChannelOption; 
import io.netty.channel.EventLoopGroup; 
import io.netty.channel.nio.NioEventLoopGroup; 
import io.netty.channel.socket.SocketChannel; 
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpRequestDecoder; 
import io.netty.handler.codec.http.HttpResponseEncoder;
import util.LogCore; 
public class HttpServer {
	public void start(int port) throws Exception {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer() {
                                @Override
                                public void initChannel(SocketChannel ch) throws Exception {
                                    // server端发送的是httpResponse，所以要使用HttpResponseEncoder进行编码
                                    ch.pipeline().addLast(new HttpResponseEncoder());
                                    // server端接收到的是httpRequest，所以要使用HttpRequestDecoder进行解码
                                    ch.pipeline().addLast(new HttpRequestDecoder());
                                    ch.pipeline().addLast(new HttpServerInboundHandler());
                                }
                            }).option(ChannelOption.SO_BACKLOG, 128) 
                    .childOption(ChannelOption.SO_KEEPALIVE, true);

            ChannelFuture f = b.bind(port).sync();

            f.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception {
        HttpServer server = new HttpServer();
        LogCore.BASE.info("Http Server listening on 8844 ...");
        server.start(8844);
    }
}

import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_LENGTH;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpHeaders.Values;
import io.netty.handler.codec.http.HttpRequest;
import util.LogCore;
public class HttpServerInboundHandler extends ChannelInboundHandlerAdapter {
	private HttpRequest request;

	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
		if (msg instanceof HttpRequest) {
			request = (HttpRequest) msg;

			String uri = request.getUri();
			System.out.println("Uri:" + uri);
		}
		if (msg instanceof HttpContent) {
			HttpContent content = (HttpContent) msg;
			ByteBuf buf = content.content();
			System.out.println(buf.toString(io.netty.util.CharsetUtil.UTF_8));
			buf.release();

			String res = "I am OK";
			FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK,
					Unpooled.wrappedBuffer(res.getBytes("UTF-8")));
			response.headers().set(CONTENT_TYPE, "text/plain");
			response.headers().set(CONTENT_LENGTH, response.content().readableBytes());
			if (HttpHeaders.isKeepAlive(request)) {
				response.headers().set(CONNECTION, Values.KEEP_ALIVE);
			}
			ctx.write(response);
			ctx.flush();
		}
	}

	@Override
	public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
		ctx.flush();
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
		LogCore.BASE.error(cause.getMessage());
		ctx.close();
	}
}

import java.net.URI;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpRequestEncoder;
import io.netty.handler.codec.http.HttpResponseDecoder;
import io.netty.handler.codec.http.HttpVersion;
import util.LogCore;
public class HttpClient {
	public void connect(String host, int port) throws Exception {
		EventLoopGroup workerGroup = new NioEventLoopGroup();

		try {
			Bootstrap b = new Bootstrap();
			b.group(workerGroup);
			b.channel(NioSocketChannel.class);
			b.option(ChannelOption.SO_KEEPALIVE, true);
			b.handler(new ChannelInitializer() {
				@Override
				public void initChannel(SocketChannel ch) throws Exception {
					// 客户端接收到的是httpResponse响应，所以要使用HttpResponseDecoder进行解码
					ch.pipeline().addLast(new HttpResponseDecoder());
					// 客户端发送的是httprequest，所以要使用HttpRequestEncoder进行编码
					ch.pipeline().addLast(new HttpRequestEncoder());
					ch.pipeline().addLast(new HttpClientInboundHandler());
				}
			});

			// Start the client.
			ChannelFuture f = b.connect(host, port).sync();

			URI uri = new URI("http://127.0.0.1:8844");
			String msg = "Are you ok?";
			DefaultFullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET,
					uri.toASCIIString(), Unpooled.wrappedBuffer(msg.getBytes("UTF-8")));

			// 构建http请求
			request.headers().set(HttpHeaders.Names.HOST, host);
			request.headers().set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
			request.headers().set(HttpHeaders.Names.CONTENT_LENGTH, request.content().readableBytes());
			// 发送http请求
			f.channel().write(request);
			f.channel().flush();
			f.channel().closeFuture().sync();
		} finally {
			workerGroup.shutdownGracefully();
		}

	}

	public static void main(String[] args) throws Exception {
		HttpClient client = new HttpClient();
		client.connect("127.0.0.1", 8844);
		LogCore.BASE.info("start!!!!");
	}
}

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpResponse;

public class HttpClientInboundHandler extends ChannelInboundHandlerAdapter {
	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
		if (msg instanceof HttpResponse) {
			HttpResponse response = (HttpResponse) msg;
			System.out.println("CONTENT_TYPE:" + response.headers().get(HttpHeaders.Names.CONTENT_TYPE));
		}
		if (msg instanceof HttpContent) {
			HttpContent content = (HttpContent) msg;
			ByteBuf buf = content.content();
			System.out.println(buf.toString(io.netty.util.CharsetUtil.UTF_8));
			buf.release();
		}
	}
}