Netty Google Protobuf

syntax = "proto3"; //版本
option java_outer_classname = "StudentPOJO";//生成的外部类名， 同时也是文件名
//protobuf 使用 message 管理数据
message Student { //会在 StudentPOJO 外部类生成一个内部类 Student， 他是真正发送的 POJO 对象
int32 id = 1; // Student 类中有 一个属性 名字为 id 类型为 int32(protobuf 类型) 1 表示属性序号， 不是值
string name = 2;
}

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
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.handler.codec.protobuf.ProtobufEncoder;

public class NettyClient {
    public static void main(String[] args) throws Exception {

        //客户端需要一个事件循环组
        EventLoopGroup group = new NioEventLoopGroup();


        try {
            //创建客户端启动对象
            //注意客户端使用的不是 ServerBootstrap 而是 Bootstrap
            Bootstrap bootstrap = new Bootstrap();

            //设置相关参数
            bootstrap.group(group) //设置线程组
                    .channel(NioSocketChannel.class) // 设置客户端通道的实现类(反射)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            //在pipeline中加入 ProtoBufEncoder
                            pipeline.addLast("encoder", new ProtobufEncoder());
                            pipeline.addLast(new NettyClientHandler()); //加入自己的处理器
                        }
                    });

            System.out.println("客户端 ok..");

            //启动客户端去连接服务器端
            //关于 ChannelFuture 要分析，涉及到netty的异步模型
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 6668).sync();
            //给关闭通道进行监听
            channelFuture.channel().closeFuture().sync();
        }finally {

            group.shutdownGracefully();

        }
    }
}

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

public class NettyClientHandler extends ChannelInboundHandlerAdapter {

    //当通道就绪就会触发该方法
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {

        //发生一个Student 对象到服务器

        StudentPOJO.Student student = StudentPOJO.Student.newBuilder().setId(4).setName("智多星 吴用").build();
        //Teacher , Member ,Message
        ctx.writeAndFlush(student);
    }

    //当通道有读取事件时，会触发
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

        ByteBuf buf = (ByteBuf) msg;
        System.out.println("服务器回复的消息:" + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器的地址： "+ ctx.channel().remoteAddress());
    }

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

import io.netty.bootstrap.ServerBootstrap;
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.protobuf.ProtobufDecoder;

public class NettyServer {
    public static void main(String[] args) throws Exception {


        //创建BossGroup 和 WorkerGroup
        //说明
        //1. 创建两个线程组 bossGroup 和 workerGroup
        //2. bossGroup 只是处理连接请求 , 真正的和客户端业务处理，会交给 workerGroup完成
        //3. 两个都是无限循环
        //4. bossGroup 和 workerGroup 含有的子线程(NioEventLoop)的个数
        //   默认实际 cpu核数 * 2
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup(); //8



        try {
            //创建服务器端的启动对象，配置参数
            ServerBootstrap bootstrap = new ServerBootstrap();

            //使用链式编程来进行设置
            bootstrap.group(bossGroup, workerGroup) //设置两个线程组
                    .channel(NioServerSocketChannel.class) //使用NioSocketChannel 作为服务器的通道实现
                    .option(ChannelOption.SO_BACKLOG, 128) // 设置线程队列得到连接个数
                    .childOption(ChannelOption.SO_KEEPALIVE, true) //设置保持活动连接状态
//                    .handler(null) // 该 handler对应 bossGroup , childHandler 对应 workerGroup
                    .childHandler(new ChannelInitializer<SocketChannel>() {//创建一个通道初始化对象(匿名对象)
                        //给pipeline 设置处理器
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {


                            ChannelPipeline pipeline = ch.pipeline();
                            //在pipeline加入ProtoBufDecoder
                            //指定对哪种对象进行解码
                            pipeline.addLast("decoder", new ProtobufDecoder(StudentPOJO.Student.getDefaultInstance()));
                            pipeline.addLast(new NettyServerHandler());
                        }
                    }); // 给我们的workerGroup 的 EventLoop 对应的管道设置处理器

            System.out.println(".....服务器 is ready...");

            //绑定一个端口并且同步, 生成了一个 ChannelFuture 对象
            //启动服务器(并绑定端口)
            ChannelFuture cf = bootstrap.bind(6668).sync();

            //给cf 注册监听器，监控我们关心的事件

            cf.addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(ChannelFuture future) throws Exception {
                    if (cf.isSuccess()) {
                        System.out.println("监听端口 6668 成功");
                    } else {
                        System.out.println("监听端口 6668 失败");
                    }
                }
            });


            //对关闭通道进行监听
            cf.channel().closeFuture().sync();
        }finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }

    }

}

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.*;
import io.netty.util.CharsetUtil;

/*
说明
1. 我们自定义一个Handler 需要继续netty 规定好的某个HandlerAdapter(规范)
2. 这时我们自定义一个Handler , 才能称为一个handler
 */
//public class NettyServerHandler extends ChannelInboundHandlerAdapter {
public class NettyServerHandler extends SimpleChannelInboundHandler<StudentPOJO.Student> {


    //读取数据实际(这里我们可以读取客户端发送的消息)
    /*
    1. ChannelHandlerContext ctx:上下文对象, 含有 管道pipeline , 通道channel, 地址
    2. Object msg: 就是客户端发送的数据 默认Object
     */
    @Override
    public void channelRead0(ChannelHandlerContext ctx, StudentPOJO.Student msg) throws Exception {

        //读取从客户端发送的StudentPojo.Student


        System.out.println("客户端发送的数据 id=" + msg.getId() + " 名字=" + msg.getName());
    }



//    //读取数据实际(这里我们可以读取客户端发送的消息)
//    /*
//    1. ChannelHandlerContext ctx:上下文对象, 含有 管道pipeline , 通道channel, 地址
//    2. Object msg: 就是客户端发送的数据 默认Object
//     */
//    @Override
//    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
//
//        //读取从客户端发送的StudentPojo.Student
//
//        StudentPOJO.Student student = (StudentPOJO.Student) msg;
//
//        System.out.println("客户端发送的数据 id=" + student.getId() + " 名字=" + student.getName());
//    }

    //数据读取完毕
    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {

        //writeAndFlush 是 write + flush
        //将数据写入到缓存，并刷新
        //一般讲，我们对这个发送的数据进行编码
        ctx.writeAndFlush(Unpooled.copiedBuffer("hello, 客户端~(>^ω^<)喵1", CharsetUtil.UTF_8));
    }

    //处理异常, 一般是需要关闭通道

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

public final class StudentPOJO {
  private StudentPOJO() {}
  public static void registerAllExtensions(
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  public static void registerAllExtensions(
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  }
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      com.google.protobuf.MessageOrBuilder {

    /**
     * <pre>
     * Student 类中有 一个属性 名字为 id 类型为int32(protobuf类型) 1表示属性序号，不是值
     * </pre>
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     */
    int getId();

    /**
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    String getName();
    /**
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  /**
   * <pre>
   *protobuf 使用message 管理数据
   * </pre>
   *
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   */
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    /**
     * <pre>
     *protobuf 使用message 管理数据
     * </pre>
     *
     * Protobuf type {@code Student}
     */
    public static final class Builder extends
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          final com.google.protobuf.UnknownFieldSet unknownFields) {
        return super.setUnknownFieldsProto3(unknownFields);
      }

      @Override
      public final Builder mergeUnknownFields(
          final com.google.protobuf.UnknownFieldSet unknownFields) {
        return super.mergeUnknownFields(unknownFields);
      }


      // @@protoc_insertion_point(builder_scope:Student)
    }

    // @@protoc_insertion_point(class_scope:Student)
    private static final Student DEFAULT_INSTANCE;
    static {
      DEFAULT_INSTANCE = new Student();
    }

    public static Student getDefaultInstance() {
      return DEFAULT_INSTANCE;
    }

    private static final com.google.protobuf.Parser<Student>
        PARSER = new com.google.protobuf.AbstractParser<Student>() {
      @Override
      public Student parsePartialFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return new Student(input, extensionRegistry);
      }
    };

    public static com.google.protobuf.Parser<Student> parser() {
      return PARSER;
    }

    @Override
    public com.google.protobuf.Parser<Student> getParserForType() {
      return PARSER;
    }

    @Override
    public Student getDefaultInstanceForType() {
      return DEFAULT_INSTANCE;
    }

  }

  private static final com.google.protobuf.Descriptors.Descriptor
    internal_static_Student_descriptor;
  private static final 
    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
      internal_static_Student_fieldAccessorTable;

  public static com.google.protobuf.Descriptors.FileDescriptor
      getDescriptor() {
    return descriptor;
  }
  private static  com.google.protobuf.Descriptors.FileDescriptor
      descriptor;
  static {
    String[] descriptorData = {
      "\n\rStudent.proto\"#\n\007Student\022\n\n\002id\030\001 \001(\005\022\014" +
      "\n\004name\030\002 \001(\tB\rB\013StudentPOJOb\006proto3"
    };
    com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
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              com.google.protobuf.Descriptors.FileDescriptor root) {
            descriptor = root;
            return null;
          }
        };
    com.google.protobuf.Descriptors.FileDescriptor
      .internalBuildGeneratedFileFrom(descriptorData,
        new com.google.protobuf.Descriptors.FileDescriptor[] {
        }, assigner);
    internal_static_Student_descriptor =
      getDescriptor().getMessageTypes().get(0);
    internal_static_Student_fieldAccessorTable = new
      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
        internal_static_Student_descriptor,
        new String[] { "Id", "Name", });
  }

  // @@protoc_insertion_point(outer_class_scope)
}