网络编程 -- RPC实现原理 -- Netty -- 迭代版本V2 -- 对象传输

　网络编程 -- RPC实现原理 -- 目录

　　啦啦啦

V2——Netty -- 使用序列化和反序列化在网络上传输对象：需要实现 java.io.Serializable 接口

　只能传输（　ByteBuf, FileRegion　）两种类型，因此必须将对象在发送之前进行序列化，放进ByteBuf中，客户端接收到ByteBuf时，将字节码取出，反序列化成对象。

　

　　Class ： Server

package lime.pri.limeNio.netty.netty02.exercise;

import java.net.InetSocketAddress;
import java.util.Date;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
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.util.CharsetUtil;
import lime.pri.limeNio.netty.netty03.entity.User;

public class Server {

    public static void main(String[] args) throws Exception {
        ServerBootstrap serverBootstrap = new ServerBootstrap();
        EventLoopGroup boss = new NioEventLoopGroup();
        EventLoopGroup worker = new NioEventLoopGroup();
        serverBootstrap.group(boss, worker);
        serverBootstrap.channel(NioServerSocketChannel.class);
        serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {

            @Override
            protected void initChannel(SocketChannel ch) throws Exception {
                ChannelPipeline pipeline = ch.pipeline();
                pipeline.addLast(new ChannelHandlerAdapter(){

                    @Override
                    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                        ByteBuf byteBuf = (ByteBuf) msg;
                        String request = byteBuf.toString(CharsetUtil.UTF_8);
                        System.out.println("客户端请求数据：" + request);

                        String response = JSON.toJSONString("请求参数不正确",SerializerFeature.WriteClassName);
                        if("Query Date".equalsIgnoreCase(request)){
                            response = JSON.toJSONString("当前系统时间：" + new Date().toString(),SerializerFeature.WriteClassName);
                        }else if("Query User".equalsIgnoreCase(request)){
                            response = JSON.toJSONString(new User(1,"lime",new Date()), SerializerFeature.WriteClassName);
                        }

                        byteBuf.clear();
                        byteBuf.writeBytes(response.getBytes(CharsetUtil.UTF_8));
                        ChannelFuture channelFuture = ctx.writeAndFlush(byteBuf);
                        channelFuture.addListener(ChannelFutureListener.CLOSE);
                    }

                });
            }

        });
        ChannelFuture channelFuture = serverBootstrap.bind(new InetSocketAddress(9999)).sync();
        channelFuture.channel().closeFuture().sync();
        boss.close();
        worker.close();
    }
}

　　Class ： Client

package lime.pri.limeNio.netty.netty02.exercise;

import java.net.InetSocketAddress;

import com.alibaba.fastjson.JSON;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
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.util.CharsetUtil;

public class Client {

    public static void main(String[] args) throws Exception {
        for (int i = 0; i < 10; i++) {
            new Thread() {
                {
                    setDaemon(false);
                }

                public void run() {
                    try {
                        client();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                };
            }.start();
        }
    }

    private static void client() throws Exception {
        Bootstrap bootstrap = new Bootstrap();
        EventLoopGroup worker = new NioEventLoopGroup();
        bootstrap.group(worker);
        bootstrap.channel(NioSocketChannel.class);
        bootstrap.handler(new ChannelInitializer<SocketChannel>() {

            @Override
            protected void initChannel(SocketChannel ch) throws Exception {
                ChannelPipeline pipeline = ch.pipeline();
                pipeline.addLast(new ChannelHandlerAdapter() {

                    /**
                     * 默认只捕获网络连接异常
                     */
                    @Override
                    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
                        System.out.println(cause);
                    }

                    @Override
                    public void channelActive(ChannelHandlerContext ctx) throws Exception {
                        String request = null;
                        switch ((int) (Math.random() * 10) % 3) {
                        case 0:
                            request = "Query Date";
                            break;
                        case 1:
                            request = "Query User";
                            break;

                        default:
                            request = "Query What?";
                            break;
                        }
                        ctx.writeAndFlush(Unpooled.buffer().writeBytes(request.getBytes(CharsetUtil.UTF_8)));
                    }

                    @Override
                    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                        ByteBuf byteBuf = (ByteBuf) msg;
                        System.out.println("服务端响应数据 --> " + JSON.parse(byteBuf.toString(CharsetUtil.UTF_8)));
                    }

                });
            }
        });
        ChannelFuture channelFuture;

        channelFuture = bootstrap.connect(new InetSocketAddress(9999)).sync();
        channelFuture.channel().closeFuture().sync();
        worker.close();
    }
}

　　Console ： Server

客户端请求数据：Query What?
客户端请求数据：Query User
客户端请求数据：Query User
客户端请求数据：Query Date
客户端请求数据：Query Date
客户端请求数据：Query What?
客户端请求数据：Query Date
客户端请求数据：Query Date
客户端请求数据：Query User
客户端请求数据：Query User

　　Console ： Client

服务端响应数据 --> 当前系统时间：Sat Jun 24 18:21:40 CST 2017
服务端响应数据 --> 请求参数不正确
服务端响应数据 --> 当前系统时间：Sat Jun 24 18:21:40 CST 2017
服务端响应数据 --> 请求参数不正确
服务端响应数据 --> 当前系统时间：Sat Jun 24 18:21:40 CST 2017
服务端响应数据 --> 当前系统时间：Sat Jun 24 18:21:40 CST 2017
服务端响应数据 --> User [id=1, name=lime, birth=Sat Jun 24 18:21:40 CST 2017]
服务端响应数据 --> User [id=1, name=lime, birth=Sat Jun 24 18:21:40 CST 2017]
服务端响应数据 --> User [id=1, name=lime, birth=Sat Jun 24 18:21:40 CST 2017]
服务端响应数据 --> User [id=1, name=lime, birth=Sat Jun 24 18:21:40 CST 2017]

啦啦啦