JAVA 网络编程(7) Netty 处理Http协议 示例

maven中使用netty的版本为：

<dependency><groupId>io.netty</groupId><artifactId>netty-all</artifactId><version>4.1.4.Final</version></dependency>

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<SocketChannel>() {                                @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;@Overridepublic 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();}}@Overridepublic void channelReadComplete(ChannelHandlerContext ctx) throws Exception {ctx.flush();}@Overridepublic 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<SocketChannel>() {@Overridepublic 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 {@Overridepublic 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();}}}