字符串 开发基于protostuff编解码技术的Netty程序：传输pojo对象(4)

package cn.xpleaf.protostuff.netty.echoservice;

import java.util.UUID;

import cn.xpleaf.protostuff.netty.pojo.EchoRequest;
import cn.xpleaf.protostuff.netty.pojo.EchoResponse;
import cn.xpleaf.protostuff.netty.pojo.User;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

public class EchoServerHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        // 接收到的对象的类型为EchoRequest
        EchoRequest req = (EchoRequest) msg;
        System.out.println(req.getRequestId() + " : " + req.getRequestObj());
        // 创建需要传输的user对象
        User user = new User();
        user.setName("server");
        user.setAge(10);
        // 创建传输的user对象载体EchoRequest对象
        EchoResponse resp = new EchoResponse();
        // 设置responseId
        resp.setResponseId(UUID.randomUUID().toString());
        // 设置需要传输的对象
        resp.setResponseObj(user);
        // 设置需要传输的对象的类型
        resp.setResponseObjClass(resp.getResponseObj().getClass());
        // 调用writeAndFlush将数据发送到socketChannel
        ctx.writeAndFlush(resp);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        ctx.close();
    }
}

package cn.xpleaf.protostuff.netty.echoservice;

import cn.xpleaf.protostuff.netty.pojo.EchoResponse;
import cn.xpleaf.protostuff.netty.utils.EchoDecoder;
import cn.xpleaf.protostuff.netty.utils.EchoEncoder;
import io.netty.bootstrap.Bootstrap;
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;

public class EchoClient {

    public void connect(int port, String host) throws Exception {
        // 配置客户端NIO线程组
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY, true)
                // 设置TCP连接超时时间
                .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 3000)
                .handler(new ChannelInitializer<SocketChannel>() {

                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        // 添加
                        ch.pipeline().addLast(new EchoDecoder(EchoResponse.class));
                        // 添加编码器
                        ch.pipeline().addLast(new EchoEncoder());
                        // 添加业务处理handler
                        ch.pipeline().addLast(new EchoClientHandler());
                    }
                });
            // 发起异步连接操作（注意服务端是bind，客户端则需要connect）
            ChannelFuture f = b.connect(host, port).sync();

            // 等待客户端链路关闭
            f.channel().closeFuture().sync();
        } finally {
            // 优雅退出，释放NIO线程组
            group.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception {
        int port = 8080;
        if(args != null && args.length > 0) {
            try {
                port = Integer.valueOf(port);
            } catch (NumberFormatException e) {
                // 采用默认值
            }
        }
        new EchoClient().connect(port, "localhost");
    }
}

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