1 它定义了一种文件类型.proto  ，定义了文件格式。

2 实现了把以上格式文件转化为不同语言文件的编译器。

$ protoc --java_out=${OUTPUT_DIR} path/to/your/proto/file
3  实现了不同语言的客户端jar包。（编译出的合成类或者文件再jar包里才有，如果不引入jar 包，编译后的文件无法使用。）
 
<dependency>
  <groupId>com.google.protobuf</groupId>
  <artifactId>protobuf-java</artifactId>
  <version>3.11.0</version>
</dependency>
 
mac 版安装protoco buffer
 
1 下载  https://github.com/protocolbuffers/protobuf/releases/download/v3.12.2/protoc-3.12.2-osx-x86_64.zip
 
解压文件到某个目录 ，并配置环境变量
 
1.1输入vi ./.bash_profile,回车，打开./.bash_profile文件
 
 新增 export PATH=/user/sdlksdks/protobuf/bin
 
2 编写文件test_pb.proto
 
syntax = "proto3";
  
 message SearchRequest {
     string query = 1;
     int32 page_number = 2;
     int32 result_per_page = 3;
 }
 

 3 执行命令 
 
protoc --java_out=.   test_pb.proto     编译test_pb.proto 生成TestPb.java 文件到当前目录。
 
protoc --php_out=. test_pb.proto   编译生成php  文件
 
4  用java 实现序列化和反序列化的逻辑
 
 TestPb.SearchRequest.Builder builder= TestPb.SearchRequest.newBuilder();
 builder.setQuery("q");
 builder.setResultPerPage(1);
 builder.setPageNumber(2);
TestPb.SearchRequest searchRequest=builder.build();
byte[] b=searchRequest.toByteArray();
TestPb.SearchRequest searchRequest1=TestPb.SearchRequest.parseFrom(b);
System.out.println(searchRequest1);
以下是生成的java 文件内容。
 
// Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: test_pb.proto
 
public final class TestPb {
   private TestPb() {}
   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 SearchRequestOrBuilder extends
       // @@protoc_insertion_point(interface_extends:SearchRequest)
       com.google.protobuf.MessageOrBuilder {
 
    /**
      * <code>string query = 1;</code>
      * @return The query.
      */
     java.lang.String getQuery();
     /**
      * <code>string query = 1;</code>
      * @return The bytes for query.
      */
     com.google.protobuf.ByteString
         getQueryBytes();
 
    /**
      * <code>int32 page_number = 2;</code>
      * @return The pageNumber.
      */
     int getPageNumber();
 
    /**
      * <code>int32 result_per_page = 3;</code>
      * @return The resultPerPage.
      */
     int getResultPerPage();
   }
   /**
    * Protobuf type {@code SearchRequest}
    */
   public static final class SearchRequest extends
       com.google.protobuf.GeneratedMessageV3 implements
       // @@protoc_insertion_point(message_implements:SearchRequest)
       SearchRequestOrBuilder {
   private static final long serialVersionUID = 0L;
     // Use SearchRequest.newBuilder() to construct.
     private SearchRequest(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
       super(builder);
     }
     private SearchRequest() {
       query_ = "";
     }
 
    @java.lang.Override
     @SuppressWarnings({"unused"})
     protected java.lang.Object newInstance(
         UnusedPrivateParameter unused) {
       return new SearchRequest();
     }
 
    @java.lang.Override
     public final com.google.protobuf.UnknownFieldSet
     getUnknownFields() {
       return this.unknownFields;
     }
     private SearchRequest(
         com.google.protobuf.CodedInputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       this();
       if (extensionRegistry == null) {
         throw new java.lang.NullPointerException();
       }
       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();
 
              query_ = s;
               break;
             }
             case 16: {
 
              pageNumber_ = input.readInt32();
               break;
             }
             case 24: {
 
              resultPerPage_ = input.readInt32();
               break;
             }
             default: {
               if (!parseUnknownField(
                   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 TestPb.internal_static_SearchRequest_descriptor;
     }
 
    @java.lang.Override
     protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
         internalGetFieldAccessorTable() {
       return TestPb.internal_static_SearchRequest_fieldAccessorTable
           .ensureFieldAccessorsInitialized(
               TestPb.SearchRequest.class, TestPb.SearchRequest.Builder.class);
     }
 
    public static final int QUERY_FIELD_NUMBER = 1;
     private volatile java.lang.Object query_;
     /**
      * <code>string query = 1;</code>
      * @return The query.
      */
     @java.lang.Override
     public java.lang.String getQuery() {
       java.lang.Object ref = query_;
       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();
         query_ = s;
         return s;
       }
     }
     /**
      * <code>string query = 1;</code>
      * @return The bytes for query.
      */
     @java.lang.Override
     public com.google.protobuf.ByteString
         getQueryBytes() {
       java.lang.Object ref = query_;
       if (ref instanceof java.lang.String) {
         com.google.protobuf.ByteString b = 
             com.google.protobuf.ByteString.copyFromUtf8(
                 (java.lang.String) ref);
         query_ = b;
         return b;
       } else {
         return (com.google.protobuf.ByteString) ref;
       }
     }
 
    public static final int PAGE_NUMBER_FIELD_NUMBER = 2;
     private int pageNumber_;
     /**
      * <code>int32 page_number = 2;</code>
      * @return The pageNumber.
      */
     @java.lang.Override
     public int getPageNumber() {
       return pageNumber_;
     }
 
    public static final int RESULT_PER_PAGE_FIELD_NUMBER = 3;
     private int resultPerPage_;
     /**
      * <code>int32 result_per_page = 3;</code>
      * @return The resultPerPage.
      */
     @java.lang.Override
     public int getResultPerPage() {
       return resultPerPage_;
     }
 
    private byte memoizedIsInitialized = -1;
     @java.lang.Override
     public final boolean isInitialized() {
       byte isInitialized = memoizedIsInitialized;
       if (isInitialized == 1) return true;
       if (isInitialized == 0) return false;
 
      memoizedIsInitialized = 1;
       return true;
     }
 
    @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
       if (!getQueryBytes().isEmpty()) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, query_);
       }
       if (pageNumber_ != 0) {
         output.writeInt32(2, pageNumber_);
       }
       if (resultPerPage_ != 0) {
         output.writeInt32(3, resultPerPage_);
       }
       unknownFields.writeTo(output);
     }
 
    @java.lang.Override
     public int getSerializedSize() {
       int size = memoizedSize;
       if (size != -1) return size;
 
      size = 0;
       if (!getQueryBytes().isEmpty()) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, query_);
       }
       if (pageNumber_ != 0) {
         size += com.google.protobuf.CodedOutputStream
           .computeInt32Size(2, pageNumber_);
       }
       if (resultPerPage_ != 0) {
         size += com.google.protobuf.CodedOutputStream
           .computeInt32Size(3, resultPerPage_);
       }
       size += unknownFields.getSerializedSize();
       memoizedSize = size;
       return size;
     }
 
    @java.lang.Override
     public boolean equals(final java.lang.Object obj) {
       if (obj == this) {
        return true;
       }
       if (!(obj instanceof TestPb.SearchRequest)) {
         return super.equals(obj);
       }
       TestPb.SearchRequest other = (TestPb.SearchRequest) obj;
 
      if (!getQuery()
           .equals(other.getQuery())) return false;
       if (getPageNumber()
           != other.getPageNumber()) return false;
       if (getResultPerPage()
           != other.getResultPerPage()) return false;
       if (!unknownFields.equals(other.unknownFields)) return false;
       return true;
     }
 
    @java.lang.Override
     public int hashCode() {
       if (memoizedHashCode != 0) {
         return memoizedHashCode;
       }
       int hash = 41;
       hash = (19 * hash) + getDescriptor().hashCode();
       hash = (37 * hash) + QUERY_FIELD_NUMBER;
       hash = (53 * hash) + getQuery().hashCode();
       hash = (37 * hash) + PAGE_NUMBER_FIELD_NUMBER;
       hash = (53 * hash) + getPageNumber();
       hash = (37 * hash) + RESULT_PER_PAGE_FIELD_NUMBER;
       hash = (53 * hash) + getResultPerPage();
       hash = (29 * hash) + unknownFields.hashCode();
       memoizedHashCode = hash;
       return hash;
     }
 
    public static TestPb.SearchRequest parseFrom(
         java.nio.ByteBuffer data)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
     public static TestPb.SearchRequest parseFrom(
         java.nio.ByteBuffer data,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
     public static TestPb.SearchRequest parseFrom(
         com.google.protobuf.ByteString data)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
     public static TestPb.SearchRequest parseFrom(
         com.google.protobuf.ByteString data,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
     public static TestPb.SearchRequest parseFrom(byte[] data)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
     public static TestPb.SearchRequest parseFrom(
         byte[] data,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
     public static TestPb.SearchRequest parseFrom(java.io.InputStream input)
         throws java.io.IOException {
       return com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input);
     }
     public static TestPb.SearchRequest parseFrom(
         java.io.InputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input, extensionRegistry);
     }
     public static TestPb.SearchRequest parseDelimitedFrom(java.io.InputStream input)
         throws java.io.IOException {
       return com.google.protobuf.GeneratedMessageV3
           .parseDelimitedWithIOException(PARSER, input);
     }
     public static TestPb.SearchRequest parseDelimitedFrom(
         java.io.InputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return com.google.protobuf.GeneratedMessageV3
           .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
     }
     public static TestPb.SearchRequest parseFrom(
         com.google.protobuf.CodedInputStream input)
         throws java.io.IOException {
       return com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input);
     }
     public static TestPb.SearchRequest parseFrom(
         com.google.protobuf.CodedInputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input, extensionRegistry);
     }
 
    @java.lang.Override
     public Builder newBuilderForType() { return newBuilder(); }
     public static Builder newBuilder() {
       return DEFAULT_INSTANCE.toBuilder();
     }
     public static Builder newBuilder(TestPb.SearchRequest prototype) {
       return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
     }
     @java.lang.Override
     public Builder toBuilder() {
       return this == DEFAULT_INSTANCE
           ? new Builder() : new Builder().mergeFrom(this);
     }
 
    @java.lang.Override
     protected Builder newBuilderForType(
         com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
       Builder builder = new Builder(parent);
       return builder;
     }
     /**
      * Protobuf type {@code SearchRequest}
      */
     public static final class Builder extends
         com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
         // @@protoc_insertion_point(builder_implements:SearchRequest)
         TestPb.SearchRequestOrBuilder {
       public static final com.google.protobuf.Descriptors.Descriptor
           getDescriptor() {
         return TestPb.internal_static_SearchRequest_descriptor;
       }
 
      @java.lang.Override
       protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
           internalGetFieldAccessorTable() {
         return TestPb.internal_static_SearchRequest_fieldAccessorTable
             .ensureFieldAccessorsInitialized(
                 TestPb.SearchRequest.class, TestPb.SearchRequest.Builder.class);
       }
 
      // Construct using TestPb.SearchRequest.newBuilder()
       private Builder() {
         maybeForceBuilderInitialization();
       }
 
      private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
         maybeForceBuilderInitialization();
       }
       private void maybeForceBuilderInitialization() {
         if (com.google.protobuf.GeneratedMessageV3
                 .alwaysUseFieldBuilders) {
         }
       }
       @java.lang.Override
       public Builder clear() {
         super.clear();
         query_ = "";
 
        pageNumber_ = 0;
 
        resultPerPage_ = 0;
 
        return this;
       }
 
      @java.lang.Override
       public com.google.protobuf.Descriptors.Descriptor
           getDescriptorForType() {
         return TestPb.internal_static_SearchRequest_descriptor;
       }
 
      @java.lang.Override
       public TestPb.SearchRequest getDefaultInstanceForType() {
         return TestPb.SearchRequest.getDefaultInstance();
       }
 
      @java.lang.Override
       public TestPb.SearchRequest build() {
         TestPb.SearchRequest result = buildPartial();
         if (!result.isInitialized()) {
           throw newUninitializedMessageException(result);
         }
         return result;
       }
 
      @java.lang.Override
       public TestPb.SearchRequest buildPartial() {
         TestPb.SearchRequest result = new TestPb.SearchRequest(this);
         result.query_ = query_;
         result.pageNumber_ = pageNumber_;
         result.resultPerPage_ = resultPerPage_;
         onBuilt();
         return result;
       }
 
      @java.lang.Override
       public Builder clone() {
         return super.clone();
       }
       @java.lang.Override
       public Builder setField(
           com.google.protobuf.Descriptors.FieldDescriptor field,
           java.lang.Object value) {
         return super.setField(field, value);
       }
       @java.lang.Override
       public Builder clearField(
           com.google.protobuf.Descriptors.FieldDescriptor field) {
         return super.clearField(field);
       }
       @java.lang.Override
       public Builder clearOneof(
           com.google.protobuf.Descriptors.OneofDescriptor oneof) {
         return super.clearOneof(oneof);
       }
       @java.lang.Override
       public Builder setRepeatedField(
           com.google.protobuf.Descriptors.FieldDescriptor field,
           int index, java.lang.Object value) {
         return super.setRepeatedField(field, index, value);
       }
       @java.lang.Override
       public Builder addRepeatedField(
           com.google.protobuf.Descriptors.FieldDescriptor field,
           java.lang.Object value) {
         return super.addRepeatedField(field, value);
       }
       @java.lang.Override
       public Builder mergeFrom(com.google.protobuf.Message other) {
         if (other instanceof TestPb.SearchRequest) {
           return mergeFrom((TestPb.SearchRequest)other);
         } else {
           super.mergeFrom(other);
           return this;
         }
       }
 
      public Builder mergeFrom(TestPb.SearchRequest other) {
         if (other == TestPb.SearchRequest.getDefaultInstance()) return this;
         if (!other.getQuery().isEmpty()) {
           query_ = other.query_;
           onChanged();
         }
         if (other.getPageNumber() != 0) {
           setPageNumber(other.getPageNumber());
         }
         if (other.getResultPerPage() != 0) {
           setResultPerPage(other.getResultPerPage());
         }
         this.mergeUnknownFields(other.unknownFields);
         onChanged();
         return this;
       }
 
      @java.lang.Override
       public final boolean isInitialized() {
         return true;
       }
 
      @java.lang.Override
       public Builder mergeFrom(
           com.google.protobuf.CodedInputStream input,
           com.google.protobuf.ExtensionRegistryLite extensionRegistry)
           throws java.io.IOException {
         TestPb.SearchRequest parsedMessage = null;
         try {
           parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
         } catch (com.google.protobuf.InvalidProtocolBufferException e) {
           parsedMessage = (TestPb.SearchRequest) e.getUnfinishedMessage();
           throw e.unwrapIOException();
         } finally {
           if (parsedMessage != null) {
             mergeFrom(parsedMessage);
           }
         }
         return this;
       }
 
      private java.lang.Object query_ = "";
       /**
        * <code>string query = 1;</code>
        * @return The query.
        */
       public java.lang.String getQuery() {
         java.lang.Object ref = query_;
         if (!(ref instanceof java.lang.String)) {
           com.google.protobuf.ByteString bs =
               (com.google.protobuf.ByteString) ref;
           java.lang.String s = bs.toStringUtf8();
           query_ = s;
           return s;
         } else {
           return (java.lang.String) ref;
         }
       }
       /**
        * <code>string query = 1;</code>
        * @return The bytes for query.
        */
       public com.google.protobuf.ByteString
           getQueryBytes() {
         java.lang.Object ref = query_;
         if (ref instanceof String) {
           com.google.protobuf.ByteString b = 
               com.google.protobuf.ByteString.copyFromUtf8(
                   (java.lang.String) ref);
           query_ = b;
           return b;
         } else {
           return (com.google.protobuf.ByteString) ref;
         }
       }
       /**
        * <code>string query = 1;</code>
        * @param value The query to set.
        * @return This builder for chaining.
        */
       public Builder setQuery(
           java.lang.String value) {
         if (value == null) {
     throw new NullPointerException();
   }
   
         query_ = value;
         onChanged();
         return this;
       }
       /**
        * <code>string query = 1;</code>
        * @return This builder for chaining.
        */
       public Builder clearQuery() {
         
         query_ = getDefaultInstance().getQuery();
         onChanged();
         return this;
       }
       /**
        * <code>string query = 1;</code>
        * @param value The bytes for query to set.
        * @return This builder for chaining.
        */
       public Builder setQueryBytes(
           com.google.protobuf.ByteString value) {
         if (value == null) {
     throw new NullPointerException();
   }
   checkByteStringIsUtf8(value);
         
         query_ = value;
         onChanged();
         return this;
       }
 
      private int pageNumber_ ;
       /**
        * <code>int32 page_number = 2;</code>
        * @return The pageNumber.
        */
       @java.lang.Override
       public int getPageNumber() {
         return pageNumber_;
       }
       /**
        * <code>int32 page_number = 2;</code>
        * @param value The pageNumber to set.
        * @return This builder for chaining.
        */
       public Builder setPageNumber(int value) {
         
         pageNumber_ = value;
         onChanged();
         return this;
       }
       /**
        * <code>int32 page_number = 2;</code>
        * @return This builder for chaining.
        */
       public Builder clearPageNumber() {
         
         pageNumber_ = 0;
         onChanged();
         return this;
       }
 
      private int resultPerPage_ ;
       /**
        * <code>int32 result_per_page = 3;</code>
        * @return The resultPerPage.
        */
       @java.lang.Override
       public int getResultPerPage() {
         return resultPerPage_;
       }
       /**
        * <code>int32 result_per_page = 3;</code>
        * @param value The resultPerPage to set.
        * @return This builder for chaining.
        */
       public Builder setResultPerPage(int value) {
         
         resultPerPage_ = value;
         onChanged();
         return this;
       }
       /**
        * <code>int32 result_per_page = 3;</code>
        * @return This builder for chaining.
        */
       public Builder clearResultPerPage() {
         
         resultPerPage_ = 0;
         onChanged();
         return this;
       }
       @java.lang.Override
       public final Builder setUnknownFields(
           final com.google.protobuf.UnknownFieldSet unknownFields) {
         return super.setUnknownFields(unknownFields);
       }
 
      @java.lang.Override
       public final Builder mergeUnknownFields(
           final com.google.protobuf.UnknownFieldSet unknownFields) {
         return super.mergeUnknownFields(unknownFields);
       }
 

       // @@protoc_insertion_point(builder_scope:SearchRequest)
     }
 
    // @@protoc_insertion_point(class_scope:SearchRequest)
     private static final TestPb.SearchRequest DEFAULT_INSTANCE;
     static {
       DEFAULT_INSTANCE = new TestPb.SearchRequest();
     }
 
    public static TestPb.SearchRequest getDefaultInstance() {
       return DEFAULT_INSTANCE;
     }
 
    private static final com.google.protobuf.Parser<SearchRequest>
         PARSER = new com.google.protobuf.AbstractParser<SearchRequest>() {
       @java.lang.Override
       public SearchRequest parsePartialFrom(
           com.google.protobuf.CodedInputStream input,
           com.google.protobuf.ExtensionRegistryLite extensionRegistry)
           throws com.google.protobuf.InvalidProtocolBufferException {
         return new SearchRequest(input, extensionRegistry);
       }
     };
 
    public static com.google.protobuf.Parser<SearchRequest> parser() {
       return PARSER;
     }
 
    @java.lang.Override
     public com.google.protobuf.Parser<SearchRequest> getParserForType() {
       return PARSER;
     }
 
    @java.lang.Override
     public TestPb.SearchRequest getDefaultInstanceForType() {
       return DEFAULT_INSTANCE;
     }
 
  private static final com.google.protobuf.Descriptors.Descriptor
     internal_static_SearchRequest_descriptor;
   private static final 
     com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
       internal_static_SearchRequest_fieldAccessorTable;
 
  public static com.google.protobuf.Descriptors.FileDescriptor
       getDescriptor() {
     return descriptor;
   }
   private static  com.google.protobuf.Descriptors.FileDescriptor
       descriptor;
   static {
     java.lang.String[] descriptorData = {
       "\n\rtest_pb.proto\"L\n\rSearchRequest\022\r\n\005quer" +
       "y\030\001 \001(\t\022\023\n\013page_number\030\002 \001(\005\022\027\n\017result_p" +
       "er_page\030\003 \001(\005b\006proto3"
     };
     descriptor = com.google.protobuf.Descriptors.FileDescriptor
       .internalBuildGeneratedFileFrom(descriptorData,
         new com.google.protobuf.Descriptors.FileDescriptor[] {
         });
     internal_static_SearchRequest_descriptor =
       getDescriptor().getMessageTypes().get(0);
     internal_static_SearchRequest_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_SearchRequest_descriptor,
         new java.lang.String[] { "Query", "PageNumber", "ResultPerPage", });
   }
 
  // @@protoc_insertion_point(outer_class_scope)
 }
  
 
                                    protobuf序列化机制：
是按照实际的数据大小去动态伸缩的, 因此很多时候我们的int数据并没有实际占用到4个字节
所以protobuf序列化后一般都会比int类型(java序列化机制)的占用长度要小很多！
                                    Protocol Buffers（protobuf）是Google提供的一个开源序列化框架，这个demo将演示如何在Windows下VC++使用protobuf
配套文章地址：http://blog.csdn.net/mycwq/article/details/17606527
 gRPC和Protobuf生成器以及Qt框架的绑定
有关更多信息，请参见和
 QtProtobuf为Google协议缓冲区提供Qt本机支持。 生成的代码除Qt框架外不依赖于任何框架。 QtProtobuf使用现有的Qt元对象信息来访问对象字段，并支持原始C ++协议缓冲区的大多数功能。 它不仅是包装器arround协议缓冲区，而且是具有自己的序列化器的纯Qt生成器。 我们的目标是提供深层的Qt，协议缓冲区和gRPC集成。
结果Linux
 :check_mark:
 :check_mark:
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 :check_mark:
QT_PROTOBUF_MAKE_COVE
通过前面的学习，我们了解到数据在网络中传输的都是二进制字节码数据，因而在发送数据时就需要编码，接收数据时就需要解码。
codec(编解码器)的组成部分有两个：decoder(解码器)和encoder(编码器)。encoder负责把业务数据转换成字节码数据，decoder负责把字节码数据转换成业务数据
Netty中本身也提供了一些编解码器,如：
StringEncoder/StringD...
                                    一、protobuf背景介绍：
    protocal Buffers(简称protobuf)是谷歌的一项技术，用于结构化的数据序列化、反序列化，常用于RPC 系统 和持续数据存储系统。
    其类似于XML生成和解析，但protobuf的效率高于XML，不过protobuf生成的是字节码，可读性比XML差，类似的序列化协议还有json、以及Java的Serializable等。
    很适合做数据存储或 RPC 数据交换格式。可用于通讯协议、数据存储等领域的语言无关、平...
如果想使用protobuf，首先需要下载protobuf的编译器
下载地址：https://github.com/protocolbuffers/protobuf/releaseshttps://github.com/protocolbuffers/protobuf/releases
根据系统选择对应的protoc编译器下载完成后，需要在项目中声明一个*.proto的文件作为数据格式的声明文件
新建：Student.proto
                                    Caused by: java.lang.VerifyError: class org.apache.hadoop.hbase.protobuf.generated.ClientProtos$Result overrides final method getUnknownFields.()Lcom/google/protobuf/UnknownFieldSet;
        at java.la
                                    一、开始报错是：
Error: out/target/common/obj/JAVA_LIBRARIES/anwbtForFramework_intermediates/classes.jar contains class file com/google/protobuf/MapFieldLite$MutatabilityAwareIterator.class, which is not in the whitelist
这种错误一看就是在白名单里面没有加某个类。但是这明显是源码里面的类
我做的动态j
                                    1、Protobuf是Google发布的开源项目，全称Google Protobuf Buffers，是一种轻便高效的结构化数据存储格式，可以用于结构化数据串行化，或者说序列化。4、支持跨平台、跨语言，即【客户端和服务端可以是不同的语言编写的】（支持目前绝大多数语言，例如C++、C#、Java、Python等）说明，在idea中编写.proto文件时，会自动提示是否下载.ptotot编写插件，可以让语法高亮。3、Protobuf是以message的方式来管理数据的。9、protobuf使用示意图。
                                    错误：java.lang.IllegalArgumentException 非法论据异常，也可称为非法形参异常。argument不是参数的意思，是争吵，争论；论据。我们经常用args用作形参。在SSM动态javaweb服务器框架中，我们经常看到这个异常，很多人说这是参数异常，检查自己在ioc容器中配置的参数是否正确，其实这是项目使用的Java编译器(即Java compiler)使用的jdk版本和...
                                    使用protobuf时，将string写入ssdb然后再读出来反序列化protobuf message的时候报错：com.google.protobuf.InvalidProtocolBufferException: While parsing a protocol message, the input ended unexpectedly in the middle of a field.  Th