基于netty構(gòu)建http服務(wù)器

基于Netty構(gòu)建Http服務(wù)的流程如下：

Client向Server發(fā)送http請求。

Server端對http請求進(jìn)行解析。

Server端向Client發(fā)送http響應(yīng)。

Client對http響應(yīng)進(jìn)行解析。

流程圖如下：

服務(wù)器端實現(xiàn)

package com.morris.netty.protocol.http;import io.netty.bootstrap.ServerBootstrap; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.*; 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.*; import io.netty.util.CharsetUtil; import lombok.extern.slf4j.Slf4j;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;@Slf4j public class Server {private static final int port = 8899;public static void main(String[] args) 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>() {@Overrideprotected void initChannel(SocketChannel ch) throws Exception {ch.pipeline().addLast(new HttpRequestDecoder()); // 請求消息解碼器ch.pipeline().addLast(new HttpObjectAggregator(65536));// 目的是將多個消息轉(zhuǎn)換為單一的request或者response對象ch.pipeline().addLast(new HttpResponseEncoder());//響應(yīng)編碼器ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {@Overridepublic void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {FullHttpRequest request = (FullHttpRequest) msg;log.info("method：{}", request.method().name());log.info("uri：{}", request.uri());log.info("content：{}", request.content().toString(CharsetUtil.UTF_8));FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK);response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");ByteBuf buffer = Unpooled.copiedBuffer("<h3>hello world</h3>", CharsetUtil.UTF_8);response.content().writeBytes(buffer);buffer.release();request.release();ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);}});// 業(yè)務(wù)邏輯}});ChannelFuture future = b.bind("127.0.0.1", port).sync();log.info("HTTP服務(wù)器啟動，網(wǎng)址是 : " + "http://127.0.0.1:" + port);future.channel().closeFuture().sync();} finally {bossGroup.shutdownGracefully();workerGroup.shutdownGracefully();}} }

在瀏覽器輸入http://127.0.0.1:8899就可以看到頁面顯示hello world。

客戶端實現(xiàn)

package com.morris.netty.protocol.http;import io.netty.bootstrap.Bootstrap; import io.netty.channel.*; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.nio.NioSocketChannel; import io.netty.handler.codec.http.*; import io.netty.util.CharsetUtil; import lombok.extern.slf4j.Slf4j;@Slf4j public class Client {public static void main(String[] args) throws InterruptedException {EventLoopGroup workerGroup = new NioEventLoopGroup();try {Bootstrap b = new Bootstrap();b.group(workerGroup).channel(NioSocketChannel.class).handler(new ChannelInitializer() {@Overrideprotected void initChannel(Channel ch) throws Exception {ch.pipeline().addLast(new HttpResponseDecoder()); // 響應(yīng)解碼器ch.pipeline().addLast(new HttpObjectAggregator(65536));ch.pipeline().addLast(new HttpRequestEncoder()); // 請求編碼器ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {@Overridepublic void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {FullHttpResponse httpResponse = (FullHttpResponse)msg;log.info("status:{}", httpResponse.status());log.info("headers:{}", httpResponse.headers());log.info("body:{}", httpResponse.content().toString(CharsetUtil.UTF_8));httpResponse.release();}@Overridepublic void channelActive(ChannelHandlerContext ctx) throws Exception {DefaultFullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, "/");// 構(gòu)建http請求request.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);request.headers().set(HttpHeaderNames.CONTENT_LENGTH, request.content().readableBytes());// 發(fā)送http請求ctx.writeAndFlush(request);}});}});// 啟動 server.ChannelFuture f = b.connect("127.0.0.1", 8899).sync();// 等待socket關(guān)閉f.channel().closeFuture().sync();} finally {workerGroup.shutdownGracefully();}} }

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