netty和protobuf的使用

1、什麼是protobuf

　　Protobuf是google的開源項目，全稱是Google Protocol Buffers，它是一個與語言無關、平臺無關、可擴展的結構化數據序列化機制，相似XML，但它是更小、更快、更簡單。只需定義一次數據的結構化方式，而後就可使用特殊生成的源代碼輕鬆地在各類數據流之間編寫和讀取結構化數據，並使用各類語言。

　　

2、protobuf使用

　　1.使用protobuf以前須要先下載並安裝protobuf編譯器。protobuf-js-3.6.1.zip，解壓後要配置環境變量，若是使用protoc --version 命令能顯示成功。

　　2.編寫.proto文件咱們須要經過在.proto文件中定義協議緩衝區消息類型來指定但願如何結構化序列化的信息。每一個協議緩衝區消息都是一個很小的信息邏輯記錄，包含一系列名稱-值對。下面是.proto文件的一個基本示例

　　

syntax = "proto3"; //這一行指定使用的是proto3的語法，默認是proto2，整個文件的第一行必須是這個，不能是空行或者註釋

package netty_protobuf3;  //包名，用來防止 不一樣文件中message名稱相同致使衝突

option java_package = "netty_protobuf3";//生成的java文件的包名，若是沒有設置java_package則用上面的package來做爲包名
option java_outer_classname = "TestMessage";//定義生成的最外層的java類的

//定義的消息中每一個字段都有一個惟一的數字編號，這些字段編號用於以消息二進制格式標識字段，在使用消息類型時不該更改。
//請注意，範圍爲1到15的字段號須要一個字節進行編碼，包括字段號和字段類型
//16到2047之間的字段號佔用兩個字節。所以，您應該爲頻繁出現的消息元素保留數字1到15
//能夠指定的最小字段號是1，最大字段號是2的29次方 - 1，即536870911。您也不能使用從19000到19999的數字
//一個.proto文件能夠定義多個message，同時也能夠定義嵌套message，這樣有利於相關的message定義在一塊兒。
/*protobuf支持的數據類型和對應的java類型

double ————> double
float ————> float
int32 ————> int(使用變長編碼。編碼負數效率低下——若是字段可能有負值，則使用sint32)
int64 ————> long(使用變長編碼。編碼負數效率低下——若是字段可能有負值，則使用sint64。)
uint32 ————> int(無符號,使用變長編碼)
uint64 ————> long(無符號，使用變長編碼)
sint32 ————> int(使用變長編碼。這些方法比常規的int32更有效地編碼負數。)
sint64 ————> long(使用變長編碼。這些方法比常規的int64更有效地編碼負數。)
fixed32 ————> int(無符號，老是四個字節。若是值一般大於2的28次方，則比uint32更有效)
fixed64 ————> long(無符號，老是8個字節。若是值一般大於2的56次方，則比uint64更有效)
sfixed32 ————> int(老是四個字節。)
sfixed64 ————> long(老是四個字節。)
bool ————> boolean
string ————> String(使用utf-8編碼或者7-bit ASCLL編碼的字符串)
bytes ————> ByteString(能夠包含任意字節序列)
*/
/*和protobuf2相比protobuf3不能本身設置默認值，而且取消了required和optional兩個關鍵字的使用，只有repeated關鍵字能夠用
可是protobuf3有系統默認值：
對於strings，默認是一個空string
對於bytes，默認是一個空的bytes
對於bools，默認是false
對於數值類型，默認是0
對於枚舉，默認是第一個定義的枚舉值，必須爲0
可重複域的默認值是空（一般狀況下是對應語言中空列表）
*/
message Person {//普通消息
    string name = 1;
    int32 id = 2;
    string email = 3;
    
    enum PhoneType {//枚舉消息
        MOBILE = 0;    //在protobuf3中，必須以0開頭，這個值爲枚舉的默認值
        HOME = 1;
        WORK = 2;
    }
    
    message PhoneNumber {
        string number = 1;
        PhoneType type = 2;
    }
    
    repeated PhoneNumber phones = 4;//至關因而一個PhoneNumber的集合
}

message AddressBook {
    repeated Person people = 1;
    oneof test { //賦值的時候下面的屬性只能選擇一個，且屬性不能用repeated來修飾
        string aname = 2;
        string aurl = 3;
    }
    
    map<string,Person> map_filed = 4;//定義map
     
}        

 

　　三、編譯.proto文件，生成java代碼

　　　　語法：protoc  --java_out=proto文件路徑

　　

syntax = "proto3";
package netty_protobuf3;
option java_package = "netty_protobuf3";
option java_outer_classname = "Human";

message Teacher{
    int32 id = 1;
    string name = 2; 
}

message Student{
    int32 id = 1;
    string name = 2;
}

message People{
    enum DataType{
        TEACHER = 0;
        STUDENT = 1;
    }
    
    DataType type = 1;
    
    oneof dataMsg {
        Student stu = 2;
        Teacher teacher = 3;
    }
    
}

 

syntax = "proto3";

package netty_protobuf3;

option java_package = "netty_protobuf3";
option java_outer_classname = "AddressBookProtos";

message Person {
    string name = 1;
    int32 id = 2;
    string email = 3;
    
    enum PhoneType {
        MOBILE = 0;
        HOME = 1;
        WORK = 2;
    }
    
    message PhoneNumber {
        string number = 1;
        PhoneType type = 2;
    }
    
    repeated PhoneNumber phones = 4;
}

message AddressBook {
    repeated Person people = 1;
}

 

package netty_protobuf3;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
import netty_protobuf3.Human.People;
import netty_protobuf3.Human.Student;
import netty_protobuf3.Human.Teacher;

public class Client {

    public static void main(String[] args) {
        
        NioEventLoopGroup group = new NioEventLoopGroup();
        
        try{
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(group).channel(NioSocketChannel.class)
            .handler(new ChannelInitializer<Channel>() {

                @Override
                protected void initChannel(Channel ch) throws Exception {
                    ch.pipeline().addLast(new ChannelInitializer<Channel>() {

                        @Override
                        protected void initChannel(Channel ch) throws Exception {
                            ch.pipeline()
                            .addLast(new ProtobufVarint32FrameDecoder())
//                            .addLast(new ProtobufDecoder(Person.getDefaultInstance()))
                            .addLast(new ProtobufDecoder(Human.People.getDefaultInstance()))
                            .addLast(new ProtobufVarint32LengthFieldPrepender())
                            .addLast(new ProtobufEncoder())
                            .addLast(new SimpleChannelInboundHandler<Human.People>() {

                                @Override
                                public void channelActive(ChannelHandlerContext ctx) throws Exception {
                                    /*Person person = Person.newBuilder()
                                            .setId(123).setName("小明").setEmail("xiaoming@qq.com")
                                            .addPhones(Person.PhoneNumber.newBuilder()
                                                    .setNumber("1234567890")
                                                    .setType(Person.PhoneType.HOME))
                                            .addPhones(Person.PhoneNumber.newBuilder()
                                                    .setNumber("2467833232")
                                                    .setType(Person.PhoneType.HOME)).build();
                                    ctx.writeAndFlush(person);*/
                                    
                                    
                                    Student student = Human.Student.newBuilder()
                                        .setId(1).setName("小明").build();
                                    People people1 = Human.People.newBuilder().setType(Human.People.DataType.STUDENT).setStu(student).build();
                                    
                                    Teacher teacher = Human.Teacher.newBuilder().setId(2).setName("xiaoming").build();
                                    People people2 = Human.People.newBuilder().setType(Human.People.DataType.TEACHER).setTeacher(teacher).build();
                                    
                                    ctx.write(people1);
                                    ctx.write(people2);
                                    ctx.flush();
                                }
                                
                                @Override
                                protected void channelRead0(ChannelHandlerContext ctx, Human.People people) throws Exception {
                                    System.out.println(people);
                                }
                            });
                        }
                        
                    });
                }
                
            });
            
            ChannelFuture future = bootstrap.connect("localhost", 9999).sync();
            future.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally{
            group.shutdownGracefully();
        }
    }

}

 

package netty_protobuf3;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
import netty_protobuf3.AddressBookProtos.Person;
import netty_protobuf3.Human.People;

public class Server {

    public static void main(String[] args) {
        
        NioEventLoopGroup bossGroup = new NioEventLoopGroup();
        NioEventLoopGroup workGroup = new NioEventLoopGroup();
        
        try{
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup,workGroup).channel(NioServerSocketChannel.class)
            .childHandler(new ChannelInitializer<Channel>() {

                @Override
                protected void initChannel(Channel ch) throws Exception {
                    ch.pipeline()
                    .addLast(new ProtobufVarint32FrameDecoder())
//                    .addLast(new ProtobufDecoder(Person.getDefaultInstance()))
                    .addLast(new ProtobufDecoder(Human.People.getDefaultInstance()))
                    .addLast(new ProtobufVarint32LengthFieldPrepender())
                    .addLast(new ProtobufEncoder())
                    .addLast(new SimpleChannelInboundHandler<People>() {
                        
                        @Override
                        protected void channelRead0(ChannelHandlerContext ctx, People people) throws Exception {
                            System.out.println(people);
                            
                            /*Person person2 = Person.newBuilder()
                                    .setId(123).setName("kyle").setEmail("kyle@qq.com")
                                    .addPhones(Person.PhoneNumber.newBuilder()
                                            .setNumber("6868686868169")
                                            .setType(Person.PhoneType.HOME)).build();
                            ctx.writeAndFlush(person2);*/
                            
                            System.out.println(people);
                            System.out.println(people.getStu().getName());
                        }
                    });
                }
                
            });
            
            ChannelFuture future = serverBootstrap.bind(9999).sync();
            future.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally{
            bossGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }

}

 

 

// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: addressbook.proto

package netty_protobuf3;

public final class AddressBookProtos {
  private AddressBookProtos() {}
  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistryLite registry) {
  }

  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistry registry) {
    registerAllExtensions(
        (com.google.protobuf.ExtensionRegistryLite) registry);
  }
  public interface PersonOrBuilder extends
      // @@protoc_insertion_point(interface_extends:netty_protobuf3.Person)
      com.google.protobuf.MessageOrBuilder {

    /**
     * <code>string name = 1;</code>
     */
    java.lang.String getName();
    /**
     * <code>string name = 1;</code>
     */
    com.google.protobuf.ByteString
        getNameBytes();

    /**
     * <code>int32 id = 2;</code>
     */
    int getId();

    /**
     * <code>string email = 3;</code>
     */
    java.lang.String getEmail();
    /**
     * <code>string email = 3;</code>
     */
    com.google.protobuf.ByteString
        getEmailBytes();

    /**
     * <code>repeated .netty_protobuf3.Person.PhoneNumber phones = 4;</code>
     */
    java.util.List<netty_protobuf3.AddressBookProtos.Person.PhoneNumber> 
        getPhonesList();
    /**
     * <code>repeated .netty_protobuf3.Person.PhoneNumber phones = 4;</code>
     */
    netty_protobuf3.AddressBookProtos.Person.PhoneNumber getPhones(int index);
    /**
     * <code>repeated .netty_protobuf3.Person.PhoneNumber phones = 4;</code>
     */
    int getPhonesCount();
    /**
     * <code>repeated .netty_protobuf3.Person.PhoneNumber phones = 4;</code>
     */
    java.util.List<? extends netty_protobuf3.AddressBookProtos.Person.PhoneNumberOrBuilder> 
        getPhonesOrBuilderList();
    /**
     * <code>repeated .netty_protobuf3.Person.PhoneNumber phones = 4;</code>
     */
    netty_protobuf3.AddressBookProtos.Person.PhoneNumberOrBuilder getPhonesOrBuilder(
        int index);
  }
  /**
   * Protobuf type {@code netty_protobuf3.Person}
   */
  public  static final class Person extends
      com.google.protobuf.GeneratedMessageV3 implements
      // @@protoc_insertion_point(message_implements:netty_protobuf3.Person)
      PersonOrBuilder {
  private static final long serialVersionUID = 0L;
    // Use Person.newBuilder() to construct.
    private Person(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
      super(builder);
    }
    private Person() {
      name_ = "";
      id_ = 0;
      email_ = "";
      phones_ = java.util.Collections.emptyList();
    }

    @java.lang.Override
    public final com.google.protobuf.UnknownFieldSet
    getUnknownFields() {
      return this.unknownFields;
    }
    private Person(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      this();
      if (extensionRegistry == null) {
        throw new java.lang.NullPointerException();
      }
      int mutable_bitField0_ = 0;
      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
          com.google.protobuf.UnknownFieldSet.newBuilder();
      try {
        boolean done = false;
        while (!done) {
          int tag = input.readTag();
          switch (tag) {
            case 0:
              done = true;
              break;
            case 10: {
              java.lang.String s = input.readStringRequireUtf8();

              name_ = s;
              break;
            }
            case 16: {

              id_ = input.readInt32();
              break;
            }
            case 26: {
              java.lang.String s = input.readStringRequireUtf8();

              email_ = s;
              break;
            }
            case 34: {
              if (!((mutable_bitField0_ & 0x00000008) == 0x00000008)) {
                phones_ = new java.util.ArrayList<netty_protobuf3.AddressBookProtos.Person.PhoneNumber>();
                mutable_bitField0_ |= 0x00000008;
              }
              phones_.add(
                  input.readMessage(netty_protobuf3.AddressBookProtos.Person.PhoneNumber.parser(), extensionRegistry));
              break;
            }
            default: {
              if (!parseUnknownFieldProto3(
                  input, unknownFields, extensionRegistry, tag)) {
                done = true;
              }
              break;
            }
          }
        }
      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(this);
      } catch (java.io.IOException e) {
        throw new com.google.protobuf.InvalidProtocolBufferException(
            e).setUnfinishedMessage(this);
      } finally {
        if (((mutable_bitField0_ & 0x00000008) == 0x00000008)) {
          phones_ = java.util.Collections.unmodifiableList(phones_);
        }
        this.unknownFields = unknownFields.build();
        makeExtensionsImmutable();
      }
    }
    public static final com.google.protobuf.Descriptors.Descriptor
        getDescriptor() {
      return netty_protobuf3.AddressBookProtos.internal_static_netty_protobuf3_Person_descriptor;
    }

    @java.lang.Override
    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
        internalGetFieldAccessorTable() {
      return netty_protobuf3.AddressBookProtos.internal_static_netty_protobuf3_Person_fieldAccessorTable
          .ensureFieldAccessorsInitialized(
              netty_protobuf3.AddressBookProtos.Person.class, netty_protobuf3.AddressBookProtos.Person.Builder.class);
    }

    /**
     * Protobuf enum {@code netty_protobuf3.Person.PhoneType}
     */
    public enum PhoneType
        implements com.google.protobuf.ProtocolMessageEnum {
      /**
       * <code>MOBILE = 0;</code>
       */
      MOBILE(0),
      /**
       * <code>HOME = 1;</code>
       */
      HOME(1),
      /**
       * <code>WORK = 2;</code>
       */
      WORK(2),
      UNRECOGNIZED(-1),
      ;

      /**
       * <code>MOBILE = 0;</code>
       */
      public static final int MOBILE_VALUE = 0;
      /**
       * <code>HOME = 1;</code>
       */
      public static final int HOME_VALUE = 1;
      /**
       * <code>WORK = 2;</code>
       */
      public static final int WORK_VALUE = 2;


      public final int getNumber() {
        if (this == UNRECOGNIZED) {
          throw new java.lang.IllegalArgumentException(
              "Can't get the number of an unknown enum value.");
        }
        return value;
      }

      /**
       * @deprecated Use {@link #forNumber(int)} instead.
       */
      @java.lang.Deprecated
      public static PhoneType valueOf(int value) {
        return forNumber(value);
      }

      public static PhoneType forNumber(int value) {
        switch (value) {
          case 0: return MOBILE;
          case 1: return HOME;
          case 2: return WORK;
          default: return null;
        }
      }

      public static com.google.protobuf.Internal.EnumLiteMap<PhoneType>
          internalGetValueMap() {
        return internalValueMap;
      }
      private static final com.google.protobuf.Internal.EnumLiteMap<
          PhoneType> internalValueMap =
            new com.google.protobuf.Internal.EnumLiteMap<PhoneType>() {
              public PhoneType findValueByNumber(int number) {
                return PhoneType.forNumber(number);
              }
            };

      public final com.google.protobuf.Descriptors.EnumValueDescriptor
          getValueDescriptor() {
        return getDescriptor().getValues().get(ordinal());
      }
      public final com.google.protobuf.Descriptors.EnumDescriptor
          getDescriptorForType() {
        return getDescriptor();
      }
      public static final com.google.protobuf.Descriptors.EnumDescriptor
          getDescriptor() {
        return netty_protobuf3.AddressBookProtos.Person.getDescriptor().getEnumTypes().get(0);
      }

      private static final PhoneType[] VALUES = values();

      public static PhoneType valueOf(
          com.google.protobuf.Descriptors.EnumValueDescriptor desc) {
        if (desc.getType() != getDescriptor()) {
          throw new java.lang.IllegalArgumentException(
            "EnumValueDescriptor is not for this type.");
        }
        if (desc.getIndex() == -1) {
          return UNRECOGNIZED;
        }
        return VALUES[desc.getIndex()];
      }

      private final int value;

      private PhoneType(int value) {
        this.value = value;
      }

      // @@protoc_insertion_point(enum_scope:netty_protobuf3.Person.PhoneType)
    }

    public interface PhoneNumberOrBuilder extends
        // @@protoc_insertion_point(interface_extends:netty_protobuf3.Person.PhoneNumber)
        com.google.protobuf.MessageOrBuilder {

      /**
       * <code>string number = 1;</code>
       */
      java.lang.String getNumber();
      /**
       * <code>string number = 1;</code>
       */
      com.google.protobuf.ByteString
          getNumberBytes();

      /**
       * <code>.netty_protobuf3.Person.PhoneType type = 2;</code>
       */
      int getTypeValue();
      /**
       * <code>.netty_protobuf3.Person.PhoneType type = 2;</code>
       */
      netty_protobuf3.AddressBookProtos.Person.PhoneType getType();
    }
    /**
     * Protobuf type {@code netty_protobuf3.Person.PhoneNumber}
     */
    public  static final class PhoneNumber extends
        com.google.protobuf.GeneratedMessageV3 implements
        // @@protoc_insertion_point(message_implements:netty_protobuf3.Person.PhoneNumber)
        PhoneNumberOrBuilder {
    private static final long serialVersionUID = 0L;
      // Use PhoneNumber.newBuilder() to construct.
      private PhoneNumber(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
        super(builder);
      }
      private PhoneNumber() {
        number_ = "";
        type_ = 0;
      }

      @java.lang.Override
      public final com.google.protobuf.UnknownFieldSet
      getUnknownFields() {
        return this.unknownFields;
      }
      private PhoneNumber(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        this();
        if (extensionRegistry == null) {
          throw new java.lang.NullPointerException();
        }
        int mutable_bitField0_ = 0;
        com.google.protobuf.UnknownFieldSet.Builder unknownFields =
            com.google.protobuf.UnknownFieldSet.newBuilder();
        try {
          boolean done = false;
          while (!done) {
            int tag = input.readTag();
            switch (tag) {
              case 0:
                done = true;
                break;
              case 10: {
                java.lang.String s = input.readStringRequireUtf8();

                number_ = s;
                break;
              }
              case 16: {
                int rawValue = input.readEnum();

                type_ = rawValue;
                break;
              }
              default: {
                if (!parseUnknownFieldProto3(
                    input, unknownFields, extensionRegistry, tag)) {
                  done = true;
                }
                break;
              }
            }
          }
        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
          throw e.setUnfinishedMessage(this);
        } catch (java.io.IOException e) {
          throw new com.google.protobuf.InvalidProtocolBufferException(
              e).setUnfinishedMessage(this);
        } finally {
          this.unknownFields = unknownFields.build();
          makeExtensionsImmutable();
        }
      }
      public static final com.google.protobuf.Descriptors.Descriptor
          getDescriptor() {
        return netty_protobuf3.AddressBookProtos.internal_static_netty_protobuf3_Person_PhoneNumber_descriptor;
      }

      @java.lang.Override
      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
          internalGetFieldAccessorTable() {
        return netty_protobuf3.AddressBookProtos.internal_static_netty_protobuf3_Person_PhoneNumber_fieldAccessorTable
            .ensureFieldAccessorsInitialized(
                netty_protobuf3.AddressBookProtos.Person.PhoneNumber.class, netty_protobuf3.AddressBookProtos.Person.PhoneNumber.Builder.class);
      }

      public static final int NUMBER_FIELD_NUMBER = 1;
      private volatile java.lang.Object number_;
      /**
       * <code>string number = 1;</code>
       */
      public java.lang.String getNumber() {
        java.lang.Object ref = number_;
        if (ref instanceof java.lang.String) {
          return (java.lang.String) ref;
        } else {
          com.google.protobuf.ByteString bs = 
              (com.google.protobuf.ByteString) ref;
          java.lang.String s = bs.toStringUtf8();
          number_ = s;
          return s;
        }
      }
      /**
       * <code>string number = 1;</code>
       */
      public com.google.protobuf.ByteString
          getNumberBytes() {
        java.lang.Object ref = number_;
        if (ref instanceof java.lang.String) {
          com.google.protobuf.ByteString b = 
              com.google.protobuf.ByteString.copyFromUtf8(
                  (java.lang.String) ref);
          number_ = b;
          return b;
        } else {
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View Code

 

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  }

  // @@protoc_insertion_point(outer_class_scope)
}

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