Netty1

基于Netty4的HttpServer和HttpClient的简单实现Netty的主页：http://netty.io/index.html使用的Netty的版本：netty-4.0.23.Final.tar.bz2 ‐ 15-Aug-2014 (Stable, Recommended)Http 消息格式：Http request:Method path-to-resource HTTPVersion-numberHeader-name-1: value1Header-name-2: value2Optional request bodyHttp response:HTTP/Version-number response-code response-phrase Header-name-1: value1Header-name-2: value2Optional response body实现一个简单的Http请求及响应过程：1、Client向Server发送http请求。2、Server端对http请求进行解析。3、Server端向client发送http响应。4、Client对http响应进行解析。Netty中Http request消息格式：Netty中Http response消息格式：代码实例：```package com.netty.test;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;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; public class HttpServer { ???private static Log log = LogFactory.getLog(HttpServer.class); ???????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(); ???????log.info("Http Server listening on 8844 ..."); ???????server.start(8844); ???}}```响应请求的HttpServerInboundHandler：复制代码package com.netty.test;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 org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;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;public class HttpServerInboundHandler extends ChannelInboundHandlerAdapter { ???private static Log log = LogFactory.getLog(HttpServerInboundHandler.class); ???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) { ???????log.error(cause.getMessage()); ???????ctx.close(); ???}}复制代码Http Client：复制代码package com.netty.test;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 java.net.URI;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); ???}}复制代码处理Server响应的HttpClientInboundHandler：复制代码package com.netty.test;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(); ???????} ???}}复制代码 参考代码：https://github.com/luxiaoxun/Code4Java 参考：https://github.com/netty/netty

Netty1

原文地址：https://www.cnblogs.com/xidianzxm/p/9597733.html