netty 使用Java序列化

SubscribeReq

package com.zhaowb.netty.ch7_1;

import java.io.Serializable;

public class SubscribeReq implements Serializable {

    private static final long serialVersionUID = 1L;

    private int subReqID;

    private String userName;

    private String productName;

    private String phoneNumber;

    private String address;

    public SubscribeReq() {
    }

    public SubscribeReq(int subReqID, String userName, String productName, String phoneNumber, String address) {
        this.subReqID = subReqID;
        this.userName = userName;
        this.productName = productName;
        this.phoneNumber = phoneNumber;
        this.address = address;
    }

    public int getSubReqID() {
        return subReqID;
    }

    public void setSubReqID(int subReqID) {
        this.subReqID = subReqID;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "SubscribeReq{" +
                "subReqID=" + subReqID +
                ", userName='" + userName + '\'' +
                ", productName='" + productName + '\'' +
                ", phoneNumber='" + phoneNumber + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

SubscribeResp

package com.zhaowb.netty.ch7_1;

import java.io.Serializable;

public class SubscribeResp implements Serializable {

    private static final long serialVersionUID = 1L;

    private int subReqID;

    private int respCode;

    private String desc;

    public SubscribeResp() {
    }

    public SubscribeResp(int subReqID, int respCode, String desc) {
        this.subReqID = subReqID;
        this.respCode = respCode;
        this.desc = desc;
    }

    public int getSubReqID() {
        return subReqID;
    }

    public void setSubReqID(int subReqID) {
        this.subReqID = subReqID;
    }

    public int getRespCode() {
        return respCode;
    }

    public void setRespCode(int respCode) {
        this.respCode = respCode;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    @Override
    public String toString() {
        return "SubscribeResp{" +
                "subReqID=" + subReqID +
                ", respCode=" + respCode +
                ", desc='" + desc + '\'' +
                '}';
    }
}

SubReqServer

package com.zhaowb.netty.ch7_1;

import com.zhaowb.netty.ch5_2.EchoServerHandler;
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.serialization.ClassResolvers;
import io.netty.handler.codec.serialization.ObjectDecoder;
import io.netty.handler.codec.serialization.ObjectEncoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

public class SubReqServer {

    public void bind(int port) throws Exception {

        // 配置 服务端的 NIO 线程组
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG, 1024)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {

                            // 创建一个 ObjectDecoder ，负责对实现 Serializable 的 POJO 对象进行解码。
                            // 有多个构造函数，支持不同的ClassResolver，使用weakCachingConcurrentResolver创建线程安全的
                            // WeakReferenceMap 对类加载器进行缓存，支持多线程并发访问，当虚拟机内存不足时，会释放缓存中
                            // 的内存，防止内存泄漏，为了防止异常码流和解码错误导致的内存溢出，将单个对象最大序列化后的
                            // 字节数组长度设置为 1M
                            ch.pipeline().addLast(new ObjectDecoder(1024 * 1024, ClassResolvers.weakCachingConcurrentResolver(this.getClass().getClassLoader())));
                            // 创建 ObjectEncoder ，可以在消息发送的时候自动将实现 Serializable 的POJO 对象进行编码，
                            // 无需对对象手动序列化，只需要关注自己的业务逻辑处理即可，对象序列化和发序列化都由netty的对象编码解码器完成。
                            ch.pipeline().addLast(new ObjectEncoder());
                            ch.pipeline().addLast(new SubReqServerHandler());
                        }
                    });

            // 绑定端口，同步等待成功。
            ChannelFuture f = b.bind(port).sync();
            // 等待服务端监听端口关闭。
            f.channel().closeFuture().sync();
        } catch (Exception e) {
            // 退出，释放线程池资源
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception {
        int port = 8080;

        if (args != null && args.length > 0) {
            try {
                port = Integer.valueOf(args[0]);
            } catch (NumberFormatException e) {
            }
        }
        new SubReqServer().bind(port);
    }
}

SubReqServerHandler

package com.zhaowb.netty.ch7_1;

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

@ChannelHandler.Sharable
public class SubReqServerHandler extends ChannelHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        SubscribeReq req = (SubscribeReq)msg;
        if( "lilinfeng".equals(req.getUserName())){

            System.out.println("Server accept client subscribe req : [" + req.toString() + "]");
            ctx.writeAndFlush(resp(req.getSubReqID()));
        }
    }

    public SubscribeResp resp( int subReqID){

        SubscribeResp resp = new SubscribeResp();
        resp.setSubReqID(subReqID);
        resp.setRespCode(10);
        resp.setDesc("Netty book order successd ,3 days later, sent to the designated address");
        return  resp;
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();// 发送异常，关闭链路
    }
}

SubReqClient

package com.zhaowb.netty.ch7_1;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
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.serialization.ClassResolvers;
import io.netty.handler.codec.serialization.ObjectDecoder;
import io.netty.handler.codec.serialization.ObjectEncoder;

public class SubReqClient {

    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)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ch.pipeline().addLast(new ObjectDecoder(1024*1024,ClassResolvers.cacheDisabled(this.getClass().getClassLoader())));
                            ch.pipeline().addLast(new ObjectEncoder());
                            ch.pipeline().addLast(new SubReqClientHandler());
                        }
                    });
            // 发起异步连接操作
            ChannelFuture f = b.connect(host, port).sync();
            // 等待客户端链路关闭
            f.channel().closeFuture().sync();
        } finally {
            // 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(args[0]);
            } catch (NumberFormatException e) {
            }
        }
        new SubReqClient().connect(port, "127.0.0.1");
    }
}

SubReqClientHandler

package com.zhaowb.netty.ch7_1;

import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

public class SubReqClientHandler extends ChannelHandlerAdapter {

    public SubReqClientHandler() {
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {

        for (int  i=0;i<10;i++){
            ctx.write(subResp(i));
        }
        ctx.flush();
    }

    private SubscribeReq subResp(int i){
        SubscribeReq req = new SubscribeReq();
        req.setAddress("国家地质公园");
        req.setPhoneNumber("5464654113");
        req.setProductName("netty 权威指南");
        req.setSubReqID(i);
        req.setUserName("lilinfeng");
        return req;
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        System.out.println("Receive server response : [" + msg + "]");
    }

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

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