protobuf 环境配置
1、安装编译器
下载地址
直接解压缩。
2、配置环境变量
环境变量Path 中增加安装目录的路径
3、检查是否配置成功
protoc
Usage: protoc [OPTION] PROTO_FILES
Parse PROTO_FILES and generate output based on the options given:-IPATH, --proto_path=PATH Specify the directory in which to search forimports. May be specified multiple times;directories will be searched in order. If notgiven, the current working directory is used.If not found in any of the these directories,the --descriptor_set_in descriptors will bechecked for required proto file.--version #版本-h, --help #帮助--encode=MESSAGE_TYPE Read a text-format message of the given typefrom standard input and write it in binaryto standard output. The message type mustbe defined in PROTO_FILES or their imports.--deterministic_output When using --encode, ensure map fields aredeterministically ordered. Note that this orderis not canonical, and changes across builds orreleases of protoc.--decode=MESSAGE_TYPE Read a binary message of the given type fromstandard input and write it in text formatto standard output. The message type mustbe defined in PROTO_FILES or their imports.--decode_raw Read an arbitrary protocol message fromstandard input and write the raw tag/valuepairs in text format to standard output. NoPROTO_FILES should be given when using thisflag.--descriptor_set_in=FILES Specifies a delimited list of FILESeach containing a FileDescriptorSet (aprotocol buffer defined in descriptor.proto).The FileDescriptor for each of the PROTO_FILESprovided will be loaded from theseFileDescriptorSets. If a FileDescriptorappears multiple times, the first occurrencewill be used.-oFILE, Writes a FileDescriptorSet (a protocol buffer,--descriptor_set_out=FILE defined in descriptor.proto) containing all ofthe input files to FILE.--include_imports When using --descriptor_set_out, also includeall dependencies of the input files in theset, so that the set is self-contained.--include_source_info When using --descriptor_set_out, do not stripSourceCodeInfo from the FileDescriptorProto.This results in vastly larger descriptors thatinclude information about the originallocation of each decl in the source file aswell as surrounding comments.--retain_options When using --descriptor_set_out, do not stripany options from the FileDescriptorProto.This results in potentially larger descriptorsthat include information about options that wereonly meant to be useful during compilation.--dependency_out=FILE Write a dependency output file in the formatexpected by make. This writes the transitiveset of input file paths to FILE--error_format=FORMAT Set the format in which to print errors.FORMAT may be 'gcc' (the default) or 'msvs'(Microsoft Visual Studio format).--fatal_warnings Make warnings be fatal (similar to -Werr ingcc). This flag will make protoc returnwith a non-zero exit code if any warningsare generated.--print_free_field_numbers Print the free field numbers of the messagesdefined in the given proto files. Extension rangesare counted as occupied fields numbers.--enable_codegen_trace Enables tracing which parts of protoc areresponsible for what codegen output. Not supportedby all backends or on all platforms.--plugin=EXECUTABLE Specifies a plugin executable to use.Normally, protoc searches the PATH forplugins, but you may specify additionalexecutables not in the path using this flag.Additionally, EXECUTABLE may be of the formNAME=PATH, in which case the given plugin nameis mapped to the given executable even ifthe executable's own name differs.--cpp_out=OUT_DIR Generate C++ header and source.--csharp_out=OUT_DIR Generate C# source file.--java_out=OUT_DIR Generate Java source file.--kotlin_out=OUT_DIR Generate Kotlin file.--objc_out=OUT_DIR Generate Objective-C header and source.--php_out=OUT_DIR Generate PHP source file.--pyi_out=OUT_DIR Generate python pyi stub.--python_out=OUT_DIR Generate Python source file.--ruby_out=OUT_DIR Generate Ruby source file.--rust_out=OUT_DIR Generate Rust sources.@<filename> Read options and filenames from file. If arelative file path is specified, the filewill be searched in the working directory.The --proto_path option will not affect howthis argument file is searched. Content ofthe file will be expanded in the position of@<filename> as in the argument list. Notethat shell expansion is not applied to thecontent of the file (i.e., you cannot usequotes, wildcards, escapes, commands, etc.).Each line corresponds to a single argument,even if it contains spaces.E:\setups\protoc-25.0-win64\bin\protoc.exe --java_out=E:\projects_study\research\base\target Data2.proto
idea 中使用 protobuf
1、idea 安装 protobuf 相关插件
安装插件：
protobuf generator：根据.proto文件来生成proto对象pojo to proto：类文件-右键-PojoProto, 将简单Java类型转成proto message拷贝至剪贴板
2、配置全局 protobuf
人工生成Java文件
1、引入包
<!-- protobuf 支持 Java 核心包--><dependency><groupId>com.google.protobuf</groupId><artifactId>protobuf-java</artifactId><version>3.21.11</version></dependency><!-- proto 与 Json 互转会用到--><dependency><groupId>com.google.protobuf</groupId><artifactId>protobuf-java-util</artifactId><version>3.15.3</version></dependency>
2、编写.proto文件
//使用 proto3 语法 ,未指定则使用proto2
syntax = "proto3";//生成 proto 文件所在包路径
package demon.research.proto;//生成的 proto 文件所在包路径
option java_package = "demon.research.proto";//生成的 proto 文件名
option java_outer_classname="DataGen";//message关键字 定义一个消息体。
message DataOriginal{int32 id = 1;string code = 2;string name = 3;
}
3、生成Java 文件
直接在文件上点击右键，quick gen protobuf here，则在此目录根据包生成一个java文件，名字为Data.java.
quick gen protobuf rules 则根据配置的规则，把java文件生成在指定的目录。
然后把生成的Java文件，copy到java类目录下。
4、序列化和反序列化
//初始化数据DataGen.DataOriginal.Builder builder = DataGen.DataOriginal.newBuilder();builder.setId(1).setCode("001").setName("张三").build();//序列化DataGen.DataOriginal build = builder.build();//转换成字节数组byte[] s = build.toByteArray();System.out.println("protobuf数据bytes[]:" + Arrays.toString(s));System.out.println("protobuf序列化大小: " + s.length);DataGen.DataOriginal data = null;String jsonObject = null;try {//反序列化data = DataGen.DataOriginal.parseFrom(s);//转 jsonjsonObject = JsonFormat.printer().print(data);} catch (Exception e) {e.printStackTrace();}System.out.println("Json格式化结果:\n" + jsonObject);System.out.println("Json格式化数据大小: " + jsonObject.getBytes().length);
输出结果：
protobuf数据bytes[]:[8, 1, 18, 3, 48, 48, 49, 26, 6, -27, -68, -96, -28, -72, -119]
protobuf序列化大小: 15
Json格式化结果:
{"id": 1,"code": "001","name": "张三"
}
Json格式化数据大小: 50
传输的数据，确实比json格式的要小。
maven自动生成
引入插件
<extensions><extension><groupId>kr.motd.maven</groupId><artifactId>os-maven-plugin</artifactId><version>1.5.0.Final</version></extension></extensions><plugin><groupId>org.xolstice.maven.plugins</groupId><artifactId>protobuf-maven-plugin</artifactId><version>0.6.1</version><configuration><protocArtifact>com.google.protobuf:protoc:3.21.11:exe:${os.detected.classifier}</protocArtifact><pluginId>grpc-java</pluginId><pluginArtifact>io.grpc:protoc-gen-grpc-java:3.21.11:exe:${os.detected.classifier}</pluginArtifact></configuration><executions><execution><goals><goal>compile</goal><goal>compile-custom</goal></goals></execution></executions></plugin>
默认.proto文件的扫描目录为： ${basedir}/src/main/proto
默认生成的文件路径为：${project.build.directory}/generated-sources/protobuf/java.
需要人工把代码放到指定目录。如果需要自动生成到指定目录，则修改指定目录。
注意：默认会把指定的目录数据都给删除掉。，可以设置
clearOutputDirectory为false。
附录
参考
下载地址
生成代码
// Generated by the protocol buffer compiler. DO NOT EDIT!
// source: DataOriginal.proto// Protobuf Java Version: 3.25.0// java_package 设置的包名
package demon.research.proto;//java_outer_classname 指定的类名
public final class DataGen {//避免修改private DataGen() {}public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);}//构造器模式。public interface DataOriginalOrBuilder extends// @@protoc_insertion_point(interface_extends:demon.research.proto.DataOriginal)com.google.protobuf.MessageOrBuilder {/*** <code>int32 id = 1;</code>* @return The id.*/int getId();//******************* 会为字符串类型 生成序列化 方法。/*** <code>string code = 2;</code>* @return The code.*/String getCode();/*** <code>string code = 2;</code>* @return The bytes for code.*/com.google.protobuf.ByteStringgetCodeBytes();/*** <code>string name = 3;</code>* @return The name.*/String getName();/*** <code>string name = 3;</code>* @return The bytes for name.*/com.google.protobuf.ByteStringgetNameBytes();}/*** <pre>*message关键字 定义一个消息体。* </pre>** Protobuf type {@code demon.research.proto.DataOriginal}*/public static final class DataOriginal extendscom.google.protobuf.GeneratedMessageV3 implements// @@protoc_insertion_point(message_implements:demon.research.proto.DataOriginal)DataOriginalOrBuilder {private static final long serialVersionUID = 0L;// Use DataOriginal.newBuilder() to construct.private DataOriginal(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {super(builder);}private DataOriginal() {code_ = "";name_ = "";}@Override@SuppressWarnings({"unused"})protected Object newInstance(UnusedPrivateParameter unused) {return new DataOriginal();}public static final com.google.protobuf.Descriptors.DescriptorgetDescriptor() {return DataGen.internal_static_demon_research_proto_DataOriginal_descriptor;}@Overrideprotected FieldAccessorTableinternalGetFieldAccessorTable() {return DataGen.internal_static_demon_research_proto_DataOriginal_fieldAccessorTable.ensureFieldAccessorsInitialized(DataOriginal.class, Builder.class);}public static final int ID_FIELD_NUMBER = 1;private int id_ = 0;/*** <code>int32 id = 1;</code>* @return The id.*/@Overridepublic int getId() {return id_;}public static final int CODE_FIELD_NUMBER = 2;@SuppressWarnings("serial")private volatile Object code_ = "";/*** <code>string code = 2;</code>* @return The code.*/@Overridepublic String getCode() {Object ref = code_;if (ref instanceof String) {return (String) ref;} else {com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;String s = bs.toStringUtf8();code_ = s;return s;}}/*** <code>string code = 2;</code>* @return The bytes for code.*/@Overridepublic com.google.protobuf.ByteStringgetCodeBytes() {Object ref = code_;if (ref instanceof String) {com.google.protobuf.ByteString b = com.google.protobuf.ByteString.copyFromUtf8((String) ref);code_ = b;return b;} else {return (com.google.protobuf.ByteString) ref;}}public static final int NAME_FIELD_NUMBER = 3;@SuppressWarnings("serial")private volatile Object name_ = "";/*** <code>string name = 3;</code>* @return The name.*/@Overridepublic String getName() {Object ref = name_;if (ref instanceof String) {return (String) ref;} else {com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;String s = bs.toStringUtf8();name_ = s;return s;}}/*** <code>string name = 3;</code>* @return The bytes for name.*/@Overridepublic com.google.protobuf.ByteStringgetNameBytes() {Object ref = name_;if (ref instanceof String) {com.google.protobuf.ByteString b = com.google.protobuf.ByteString.copyFromUtf8((String) ref);name_ = b;return b;} else {return (com.google.protobuf.ByteString) ref;}}private byte memoizedIsInitialized = -1;@Overridepublic final boolean isInitialized() {byte isInitialized = memoizedIsInitialized;if (isInitialized == 1) return true;if (isInitialized == 0) return false;memoizedIsInitialized = 1;return true;}@Overridepublic void writeTo(com.google.protobuf.CodedOutputStream output)throws java.io.IOException {if (id_ != 0) {output.writeInt32(1, id_);}if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(code_)) {com.google.protobuf.GeneratedMessageV3.writeString(output, 2, code_);}if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {com.google.protobuf.GeneratedMessageV3.writeString(output, 3, name_);}getUnknownFields().writeTo(output);}@Overridepublic int getSerializedSize() {int size = memoizedSize;if (size != -1) return size;size = 0;if (id_ != 0) {size += com.google.protobuf.CodedOutputStream.computeInt32Size(1, id_);}if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(code_)) {size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, code_);}if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, name_);}size += getUnknownFields().getSerializedSize();memoizedSize = size;return size;}@Overridepublic boolean equals(final Object obj) {if (obj == this) {return true;}if (!(obj instanceof DataOriginal)) {return super.equals(obj);}DataOriginal other = (DataOriginal) obj;if (getId()!= other.getId()) return false;if (!getCode().equals(other.getCode())) return false;if (!getName().equals(other.getName())) return false;if (!getUnknownFields().equals(other.getUnknownFields())) return false;return true;}@Overridepublic int hashCode() {if (memoizedHashCode != 0) {return memoizedHashCode;}int hash = 41;hash = (19 * hash) + getDescriptor().hashCode();hash = (37 * hash) + ID_FIELD_NUMBER;hash = (53 * hash) + getId();hash = (37 * hash) + CODE_FIELD_NUMBER;hash = (53 * hash) + getCode().hashCode();hash = (37 * hash) + NAME_FIELD_NUMBER;hash = (53 * hash) + getName().hashCode();hash = (29 * hash) + getUnknownFields().hashCode();memoizedHashCode = hash;return hash;}public static DataOriginal parseFrom(java.nio.ByteBuffer data)throws com.google.protobuf.InvalidProtocolBufferException {return PARSER.parseFrom(data);}public static DataOriginal parseFrom(java.nio.ByteBuffer data,com.google.protobuf.ExtensionRegistryLite extensionRegistry)throws com.google.protobuf.InvalidProtocolBufferException {return PARSER.parseFrom(data, extensionRegistry);}public static DataOriginal parseFrom(com.google.protobuf.ByteString data)throws com.google.protobuf.InvalidProtocolBufferException {return PARSER.parseFrom(data);}public static DataOriginal parseFrom(com.google.protobuf.ByteString data,com.google.protobuf.ExtensionRegistryLite extensionRegistry)throws com.google.protobuf.InvalidProtocolBufferException {return PARSER.parseFrom(data, extensionRegistry);}public static DataOriginal parseFrom(byte[] data)throws com.google.protobuf.InvalidProtocolBufferException {return PARSER.parseFrom(data);}public static DataOriginal parseFrom(byte[] data,com.google.protobuf.ExtensionRegistryLite extensionRegistry)throws com.google.protobuf.InvalidProtocolBufferException {return PARSER.parseFrom(data, extensionRegistry);}public static DataOriginal parseFrom(java.io.InputStream input)throws java.io.IOException {return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);}public static DataOriginal 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 DataOriginal parseDelimitedFrom(java.io.InputStream input)throws java.io.IOException {return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);}public static DataOriginal 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 DataOriginal parseFrom(com.google.protobuf.CodedInputStream input)throws java.io.IOException {return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);}public static DataOriginal parseFrom(com.google.protobuf.CodedInputStream input,com.google.protobuf.ExtensionRegistryLite extensionRegistry)throws java.io.IOException {return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input, extensionRegistry);}@Overridepublic Builder newBuilderForType() { return newBuilder(); }public static Builder newBuilder() {return DEFAULT_INSTANCE.toBuilder();}public static Builder newBuilder(DataOriginal prototype) {return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);}@Overridepublic Builder toBuilder() {return this == DEFAULT_INSTANCE? new Builder() : new Builder().mergeFrom(this);}@Overrideprotected Builder newBuilderForType(BuilderParent parent) {Builder builder = new Builder(parent);return builder;}/*** <pre>*message关键字 定义一个消息体。* </pre>** Protobuf type {@code demon.research.proto.DataOriginal}*/public static final class Builder extendscom.google.protobuf.GeneratedMessageV3.Builder<Builder> implements// @@protoc_insertion_point(builder_implements:demon.research.proto.DataOriginal)DataOriginalOrBuilder {public static final com.google.protobuf.Descriptors.DescriptorgetDescriptor() {return DataGen.internal_static_demon_research_proto_DataOriginal_descriptor;}@Overrideprotected FieldAccessorTableinternalGetFieldAccessorTable() {return DataGen.internal_static_demon_research_proto_DataOriginal_fieldAccessorTable.ensureFieldAccessorsInitialized(DataOriginal.class, Builder.class);}// Construct using demon.research.proto.DataGen.DataOriginal.newBuilder()private Builder() {}private Builder(BuilderParent parent) {super(parent);}@Overridepublic Builder clear() {super.clear();bitField0_ = 0;id_ = 0;code_ = "";name_ = "";return this;}@Overridepublic com.google.protobuf.Descriptors.DescriptorgetDescriptorForType() {return DataGen.internal_static_demon_research_proto_DataOriginal_descriptor;}@Overridepublic DataOriginal getDefaultInstanceForType() {return DataOriginal.getDefaultInstance();}@Overridepublic DataOriginal build() {DataOriginal result = buildPartial();if (!result.isInitialized()) {throw newUninitializedMessageException(result);}return result;}@Overridepublic DataOriginal buildPartial() {DataOriginal result = new DataOriginal(this);if (bitField0_ != 0) { buildPartial0(result); }onBuilt();return result;}private void buildPartial0(DataOriginal result) {int from_bitField0_ = bitField0_;if (((from_bitField0_ & 0x00000001) != 0)) {result.id_ = id_;}if (((from_bitField0_ & 0x00000002) != 0)) {result.code_ = code_;}if (((from_bitField0_ & 0x00000004) != 0)) {result.name_ = name_;}}@Overridepublic Builder clone() {return super.clone();}@Overridepublic Builder setField(com.google.protobuf.Descriptors.FieldDescriptor field,Object value) {return super.setField(field, value);}@Overridepublic Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {return super.clearField(field);}@Overridepublic Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {return super.clearOneof(oneof);}@Overridepublic Builder setRepeatedField(com.google.protobuf.Descriptors.FieldDescriptor field,int index, Object value) {return super.setRepeatedField(field, index, value);}@Overridepublic Builder addRepeatedField(com.google.protobuf.Descriptors.FieldDescriptor field,Object value) {return super.addRepeatedField(field, value);}@Overridepublic Builder mergeFrom(com.google.protobuf.Message other) {if (other instanceof DataOriginal) {return mergeFrom((DataOriginal)other);} else {super.mergeFrom(other);return this;}}public Builder mergeFrom(DataOriginal other) {if (other == DataOriginal.getDefaultInstance()) return this;if (other.getId() != 0) {setId(other.getId());}if (!other.getCode().isEmpty()) {code_ = other.code_;bitField0_ |= 0x00000002;onChanged();}if (!other.getName().isEmpty()) {name_ = other.name_;bitField0_ |= 0x00000004;onChanged();}this.mergeUnknownFields(other.getUnknownFields());onChanged();return this;}@Overridepublic final boolean isInitialized() {return true;}@Overridepublic Builder mergeFrom(com.google.protobuf.CodedInputStream input,com.google.protobuf.ExtensionRegistryLite extensionRegistry)throws java.io.IOException {if (extensionRegistry == null) {throw new NullPointerException();}try {boolean done = false;while (!done) {int tag = input.readTag();switch (tag) {case 0:done = true;break;case 8: {id_ = input.readInt32();bitField0_ |= 0x00000001;break;} // case 8case 18: {code_ = input.readStringRequireUtf8();bitField0_ |= 0x00000002;break;} // case 18case 26: {name_ = input.readStringRequireUtf8();bitField0_ |= 0x00000004;break;} // case 26default: {if (!super.parseUnknownField(input, extensionRegistry, tag)) {done = true; // was an endgroup tag}break;} // default:} // switch (tag)} // while (!done)} catch (com.google.protobuf.InvalidProtocolBufferException e) {throw e.unwrapIOException();} finally {onChanged();} // finallyreturn this;}private int bitField0_;private int id_ ;/*** <code>int32 id = 1;</code>* @return The id.*/@Overridepublic int getId() {return id_;}/*** <code>int32 id = 1;</code>* @param value The id to set.* @return This builder for chaining.*/public Builder setId(int value) {id_ = value;bitField0_ |= 0x00000001;onChanged();return this;}/*** <code>int32 id = 1;</code>* @return This builder for chaining.*/public Builder clearId() {bitField0_ = (bitField0_ & ~0x00000001);id_ = 0;onChanged();return this;}private Object code_ = "";/*** <code>string code = 2;</code>* @return The code.*/public String getCode() {Object ref = code_;if (!(ref instanceof String)) {com.google.protobuf.ByteString bs =(com.google.protobuf.ByteString) ref;String s = bs.toStringUtf8();code_ = s;return s;} else {return (String) ref;}}/*** <code>string code = 2;</code>* @return The bytes for code.*/public com.google.protobuf.ByteStringgetCodeBytes() {Object ref = code_;if (ref instanceof String) {com.google.protobuf.ByteString b = com.google.protobuf.ByteString.copyFromUtf8((String) ref);code_ = b;return b;} else {return (com.google.protobuf.ByteString) ref;}}/*** <code>string code = 2;</code>* @param value The code to set.* @return This builder for chaining.*/public Builder setCode(String value) {if (value == null) { throw new NullPointerException(); }code_ = value;bitField0_ |= 0x00000002;onChanged();return this;}/*** <code>string code = 2;</code>* @return This builder for chaining.*/public Builder clearCode() {code_ = getDefaultInstance().getCode();bitField0_ = (bitField0_ & ~0x00000002);onChanged();return this;}/*** <code>string code = 2;</code>* @param value The bytes for code to set.* @return This builder for chaining.*/public Builder setCodeBytes(com.google.protobuf.ByteString value) {if (value == null) { throw new NullPointerException(); }checkByteStringIsUtf8(value);code_ = value;bitField0_ |= 0x00000002;onChanged();return this;}private Object name_ = "";/*** <code>string name = 3;</code>* @return The name.*/public String getName() {Object ref = name_;if (!(ref instanceof String)) {com.google.protobuf.ByteString bs =(com.google.protobuf.ByteString) ref;String s = bs.toStringUtf8();name_ = s;return s;} else {return (String) ref;}}/*** <code>string name = 3;</code>* @return The bytes for name.*/public com.google.protobuf.ByteStringgetNameBytes() {Object ref = name_;if (ref instanceof String) {com.google.protobuf.ByteString b = com.google.protobuf.ByteString.copyFromUtf8((String) ref);name_ = b;return b;} else {return (com.google.protobuf.ByteString) ref;}}/*** <code>string name = 3;</code>* @param value The name to set.* @return This builder for chaining.*/public Builder setName(String value) {if (value == null) { throw new NullPointerException(); }name_ = value;bitField0_ |= 0x00000004;onChanged();return this;}/*** <code>string name = 3;</code>* @return This builder for chaining.*/public Builder clearName() {name_ = getDefaultInstance().getName();bitField0_ = (bitField0_ & ~0x00000004);onChanged();return this;}/*** <code>string name = 3;</code>* @param value The bytes for name to set.* @return This builder for chaining.*/public Builder setNameBytes(com.google.protobuf.ByteString value) {if (value == null) { throw new NullPointerException(); }checkByteStringIsUtf8(value);name_ = value;bitField0_ |= 0x00000004;onChanged();return this;}@Overridepublic final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {return super.setUnknownFields(unknownFields);}@Overridepublic final Builder mergeUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {return super.mergeUnknownFields(unknownFields);}// @@protoc_insertion_point(builder_scope:demon.research.proto.DataOriginal)}// @@protoc_insertion_point(class_scope:demon.research.proto.DataOriginal)private static final DataOriginal DEFAULT_INSTANCE;static {DEFAULT_INSTANCE = new DataOriginal();}public static DataOriginal getDefaultInstance() {return DEFAULT_INSTANCE;}private static final com.google.protobuf.Parser<DataOriginal>PARSER = new com.google.protobuf.AbstractParser<DataOriginal>() {@Overridepublic DataOriginal parsePartialFrom(com.google.protobuf.CodedInputStream input,com.google.protobuf.ExtensionRegistryLite extensionRegistry)throws com.google.protobuf.InvalidProtocolBufferException {Builder builder = newBuilder();try {builder.mergeFrom(input, extensionRegistry);} catch (com.google.protobuf.InvalidProtocolBufferException e) {throw e.setUnfinishedMessage(builder.buildPartial());} catch (com.google.protobuf.UninitializedMessageException e) {throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());} catch (java.io.IOException e) {throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(builder.buildPartial());}return builder.buildPartial();}};public static com.google.protobuf.Parser<DataOriginal> parser() {return PARSER;}@Overridepublic com.google.protobuf.Parser<DataOriginal> getParserForType() {return PARSER;}@Overridepublic DataOriginal getDefaultInstanceForType() {return DEFAULT_INSTANCE;}}private static final com.google.protobuf.Descriptors.Descriptorinternal_static_demon_research_proto_DataOriginal_descriptor;private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTableinternal_static_demon_research_proto_DataOriginal_fieldAccessorTable;public static com.google.protobuf.Descriptors.FileDescriptorgetDescriptor() {return descriptor;}private static com.google.protobuf.Descriptors.FileDescriptordescriptor;static {String[] descriptorData = {"\n\022DataOriginal.proto\022\024demon.research.pro" +"to\"6\n\014DataOriginal\022\n\n\002id\030\001 \001(\005\022\014\n\004code\030\002" +" \001(\t\022\014\n\004name\030\003 \001(\tB\037\n\024demon.research.pro" +"toB\007DataGenb\006proto3"};descriptor = com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(descriptorData,new com.google.protobuf.Descriptors.FileDescriptor[] {});internal_static_demon_research_proto_DataOriginal_descriptor =getDescriptor().getMessageTypes().get(0);internal_static_demon_research_proto_DataOriginal_fieldAccessorTable = newcom.google.protobuf.GeneratedMessageV3.FieldAccessorTable(internal_static_demon_research_proto_DataOriginal_descriptor,new String[] { "Id", "Code", "Name", });}// @@protoc_insertion_point(outer_class_scope)
}1、DataGen 类只提供框架方法。
public final class DataGen {private DataGen() {}public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);}private static final com.google.protobuf.Descriptors.Descriptorinternal_static_demon_research_proto_DataOriginal_descriptor;private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTableinternal_static_demon_research_proto_DataOriginal_fieldAccessorTable;public static com.google.protobuf.Descriptors.FileDescriptorgetDescriptor() {return descriptor;}private static com.google.protobuf.Descriptors.FileDescriptordescriptor;2、接口 DataOriginalOrBuilder，只提供了get方法。
int getId();
String getCode();
com.google.protobuf.ByteString getCodeBytes();
String getName();com.google.protobuf.ByteString getNameBytes();
3、类DataOriginal 继承类 com.google.protobuf.GeneratedMessageV3 ，实现接口 DataOriginalOrBuilder提供了get方法，并保存了数据。同时提供了序列化与反序列化能力
public static final int ID_FIELD_NUMBER = 1;private int id_ = 0;/*** <code>int32 id = 1;</code>* @return The id.*/@Overridepublic int getId() {return id_;}
4、类Builder 继承类 com.google.protobuf.GeneratedMessageV3.Builder<Builder> ，实现接口 DataOriginalOrBuilder提供了get/set方法，
