Netty 4.0.23 简单用例

一、简单的Http请求以及响应过程

a、client客户端请求服务器端数据。

b、serice 端开始解析client端的数据信息。

c、service端返回给client端数据信息。

4.、client 解析service 返回的信息。

二、代码实现

1、客户端请求代码

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;

/**
 * TODO:
 * @author liyong
 * @Date 2016年1月22日 下午12:02:21
 */
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>() {
                @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());
                }
            });

            ChannelFuture f = b.connect(host, port).sync();

            URI uri = new URI("http://127.0.0.1:8844");
            String msg = "来自客户端的问候。。。";
            System.out.println("客户端请求的信息:" + msg);
            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);
    }
}

2、客户端解析代码

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;

/**
 * @author liyong
 * @Date 2016年1月22日 下午12:03:02
 */
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("客户端接收服务器端返回的内容类型:" + response.headers().get(HttpHeaders.Names.CONTENT_TYPE));
        }
        if (msg instanceof HttpContent) {
            HttpContent content = (HttpContent) msg;
            ByteBuf buf = content.content();
            System.out.println("客户端接收服务器端返回的内容：" + buf.toString(io.netty.util.CharsetUtil.UTF_8));
            buf.release();
        }
    }
}

3、服务器端解析代码

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;

/**
 * @author liyong
 * @Date 2016年1月22日 上午11:59:43
 */
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<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();
        log.info("Http Server listening on 8844 ...");
        server.start(8844);
    }
}

4、服务器端返回代码

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;

/**
 * TODO:
 * @author liyong
 * @Date 2016年1月22日 下午12:01:18
 */
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("服务器接收客户端请求Uri:" + uri);
        }
        if (msg instanceof HttpContent) {
            HttpContent content = (HttpContent) msg;
            ByteBuf buf = content.content();
            System.out.println("服务器接收客户端请求的信息:" + buf.toString(io.netty.util.CharsetUtil.UTF_8));
            buf.release();

            String res = "I am OK";
            System.out.println("服务端返回给客户端的信息：" + res);
            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();
    }
}

三、运行

1、先启动服务器端监听

运行 HttpServer.java 中的 main 方法

2、运行客户端实现请求数据

运行 HttpClient.java 中的 main 方法

代码中的所用到的 netty-all-4.0.23.Final.jar 和 netty-all-4.0.23.Final-sources.jar

可在 http://pan.baidu.com/s/1gevXVYb 点击打开链接中下载。

Netty 4.0.23 简单用例

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