本文共 37012 字，大约阅读时间需要 123 分钟。
Protocol 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。它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、平台无关、可扩展的序列化结构数据格式。目前提供了 C++、Java、Python 三种语言的 API。
下面通过实验比较两者序列化后的字节数
protobuff:
[8, 101, 16, 20, 26, 5, 112, 101, 116, 101, 114, 32, -23, 7]
java:
[-84, -19, 0, 5, 115, 114, 0, 15, 99, 111, 109, 46, 106, 97, 118, 97, 46, 80, 108, 97, 121, 101, 114, -73, 43, 28, 39, -119, -86, -125, -3, 2, 0, 4, 73, 0, 3, 97, 103, 101, 74, 0, 8, 112, 108, 97, 121, 101, 114, 73, 100, 76, 0, 4, 110, 97, 109, 101, 116, 0, 18, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 76, 0, 6, 115, 107, 105, 108, 108, 115, 116, 0, 16, 76, 106, 97, 118, 97, 47, 117, 116, 105, 108, 47, 76, 105, 115, 116, 59, 120, 112, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 101, 116, 0, 5, 112, 101, 116, 101, 114, 115, 114, 0, 19, 106, 97, 118, 97, 46, 117, 116, 105, 108, 46, 65, 114, 114, 97, 121, 76, 105, 115, 116, 120, -127, -46, 29, -103, -57, 97, -99, 3, 0, 1, 73, 0, 4, 115, 105, 122, 101, 120, 112, 0, 0, 0, 1, 119, 4, 0, 0, 0, 1, 115, 114, 0, 17, 106, 97, 118, 97, 46, 108, 97, 110, 103, 46, 73, 110, 116, 101, 103, 101, 114, 18, -30, -96, -92, -9, -127, -121, 56, 2, 0, 1, 73, 0, 5, 118, 97, 108, 117, 101, 120, 114, 0, 16, 106, 97, 118, 97, 46, 108, 97, 110, 103, 46, 78, 117, 109, 98, 101, 114, -122, -84, -107, 29, 11, -108, -32, -117, 2, 0, 0, 120, 112, 0, 0, 3, -23, 120]
player.proto
option java_package = "com.proto";option java_outer_classname = "PlayerModule";message PBPlayer { required int64 playerId = 1; required int32 age = 2; required string name = 3; repeated int32 skills = 4;}message PBResource { required int64 gold = 1; required int32 energy = 2;} build.bat 使用protoc.exe 生成java代码
protoc ./proto/*.proto --java_out=./srcpause
生成的java代码如下
// Generated by the protocol buffer compiler. DO NOT EDIT!// source: proto/player.protopackage com.proto;public final class PlayerModule { private PlayerModule() {} public static void registerAllExtensions( com.google.protobuf.ExtensionRegistry registry) { } public interface PBPlayerOrBuilder extends com.google.protobuf.MessageOrBuilder { // required int64 playerId = 1; boolean hasPlayerId(); long getPlayerId(); // required int32 age = 2; boolean hasAge(); int getAge(); // required string name = 3; boolean hasName(); String getName(); // repeated int32 skills = 4; java.util.List getSkillsList(); int getSkillsCount(); int getSkills(int index); } public static final class PBPlayer extends com.google.protobuf.GeneratedMessage implements PBPlayerOrBuilder { // Use PBPlayer.newBuilder() to construct. private PBPlayer(Builder builder) { super(builder); } private PBPlayer(boolean noInit) {} private static final PBPlayer defaultInstance; public static PBPlayer getDefaultInstance() { return defaultInstance; } public PBPlayer getDefaultInstanceForType() { return defaultInstance; } public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() { return com.proto.PlayerModule.internal_static_PBPlayer_descriptor; } protected com.google.protobuf.GeneratedMessage.FieldAccessorTable internalGetFieldAccessorTable() { return com.proto.PlayerModule.internal_static_PBPlayer_fieldAccessorTable; } private int bitField0_; // required int64 playerId = 1; public static final int PLAYERID_FIELD_NUMBER = 1; private long playerId_; public boolean hasPlayerId() { return ((bitField0_ & 0x00000001) == 0x00000001); } public long getPlayerId() { return playerId_; } // required int32 age = 2; public static final int AGE_FIELD_NUMBER = 2; private int age_; public boolean hasAge() { return ((bitField0_ & 0x00000002) == 0x00000002); } public int getAge() { return age_; } // required string name = 3; public static final int NAME_FIELD_NUMBER = 3; private java.lang.Object name_; public boolean hasName() { return ((bitField0_ & 0x00000004) == 0x00000004); } public String getName() { java.lang.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(); if (com.google.protobuf.Internal.isValidUtf8(bs)) { name_ = s; } return s; } } private com.google.protobuf.ByteString getNameBytes() { java.lang.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; } } // repeated int32 skills = 4; public static final int SKILLS_FIELD_NUMBER = 4; private java.util.List skills_; public java.util.List getSkillsList() { return skills_; } public int getSkillsCount() { return skills_.size(); } public int getSkills(int index) { return skills_.get(index); } private void initFields() { playerId_ = 0L; age_ = 0; name_ = ""; skills_ = java.util.Collections.emptyList();; } private byte memoizedIsInitialized = -1; public final boolean isInitialized() { byte isInitialized = memoizedIsInitialized; if (isInitialized != -1) return isInitialized == 1; if (!hasPlayerId()) { memoizedIsInitialized = 0; return false; } if (!hasAge()) { memoizedIsInitialized = 0; return false; } if (!hasName()) { memoizedIsInitialized = 0; return false; } memoizedIsInitialized = 1; return true; } public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException { getSerializedSize(); if (((bitField0_ & 0x00000001) == 0x00000001)) { output.writeInt64(1, playerId_); } if (((bitField0_ & 0x00000002) == 0x00000002)) { output.writeInt32(2, age_); } if (((bitField0_ & 0x00000004) == 0x00000004)) { output.writeBytes(3, getNameBytes()); } for (int i = 0; i < skills_.size(); i++) { output.writeInt32(4, skills_.get(i)); } getUnknownFields().writeTo(output); } private int memoizedSerializedSize = -1; public int getSerializedSize() { int size = memoizedSerializedSize; if (size != -1) return size; size = 0; if (((bitField0_ & 0x00000001) == 0x00000001)) { size += com.google.protobuf.CodedOutputStream .computeInt64Size(1, playerId_); } if (((bitField0_ & 0x00000002) == 0x00000002)) { size += com.google.protobuf.CodedOutputStream .computeInt32Size(2, age_); } if (((bitField0_ & 0x00000004) == 0x00000004)) { size += com.google.protobuf.CodedOutputStream .computeBytesSize(3, getNameBytes()); } { int dataSize = 0; for (int i = 0; i < skills_.size(); i++) { dataSize += com.google.protobuf.CodedOutputStream .computeInt32SizeNoTag(skills_.get(i)); } size += dataSize; size += 1 * getSkillsList().size(); } size += getUnknownFields().getSerializedSize(); memoizedSerializedSize = size; return size; } private static final long serialVersionUID = 0L; @java.lang.Override protected java.lang.Object writeReplace() throws java.io.ObjectStreamException { return super.writeReplace(); } public static com.proto.PlayerModule.PBPlayer parseFrom( com.google.protobuf.ByteString data) throws com.google.protobuf.InvalidProtocolBufferException { return newBuilder().mergeFrom(data).buildParsed(); } public static com.proto.PlayerModule.PBPlayer parseFrom( com.google.protobuf.ByteString data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException { return newBuilder().mergeFrom(data, extensionRegistry) .buildParsed(); } public static com.proto.PlayerModule.PBPlayer parseFrom(byte[] data) throws com.google.protobuf.InvalidProtocolBufferException { return newBuilder().mergeFrom(data).buildParsed(); } public static com.proto.PlayerModule.PBPlayer parseFrom( byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException { return newBuilder().mergeFrom(data, extensionRegistry) .buildParsed(); } public static com.proto.PlayerModule.PBPlayer parseFrom(java.io.InputStream input) throws java.io.IOException { return newBuilder().mergeFrom(input).buildParsed(); } public static com.proto.PlayerModule.PBPlayer parseFrom( java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException { return newBuilder().mergeFrom(input, extensionRegistry) .buildParsed(); } public static com.proto.PlayerModule.PBPlayer parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException { Builder builder = newBuilder(); if (builder.mergeDelimitedFrom(input)) { return builder.buildParsed(); } else { return null; } } public static com.proto.PlayerModule.PBPlayer parseDelimitedFrom( java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException { Builder builder = newBuilder(); if (builder.mergeDelimitedFrom(input, extensionRegistry)) { return builder.buildParsed(); } else { return null; } } public static com.proto.PlayerModule.PBPlayer parseFrom( com.google.protobuf.CodedInputStream input) throws java.io.IOException { return newBuilder().mergeFrom(input).buildParsed(); } public static com.proto.PlayerModule.PBPlayer parseFrom( com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException { return newBuilder().mergeFrom(input, extensionRegistry) .buildParsed(); } public static Builder newBuilder() { return Builder.create(); } public Builder newBuilderForType() { return newBuilder(); } public static Builder newBuilder(com.proto.PlayerModule.PBPlayer prototype) { return newBuilder().mergeFrom(prototype); } public Builder toBuilder() { return newBuilder(this); } @java.lang.Override protected Builder newBuilderForType( com.google.protobuf.GeneratedMessage.BuilderParent parent) { Builder builder = new Builder(parent); return builder; } public static final class Builder extends com.google.protobuf.GeneratedMessage.Builder implements com.proto.PlayerModule.PBPlayerOrBuilder { public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() { return com.proto.PlayerModule.internal_static_PBPlayer_descriptor; } protected com.google.protobuf.GeneratedMessage.FieldAccessorTable internalGetFieldAccessorTable() { return com.proto.PlayerModule.internal_static_PBPlayer_fieldAccessorTable; } // Construct using com.proto.PlayerModule.PBPlayer.newBuilder() private Builder() { maybeForceBuilderInitialization(); } private Builder(BuilderParent parent) { super(parent); maybeForceBuilderInitialization(); } private void maybeForceBuilderInitialization() { if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) { } } private static Builder create() { return new Builder(); } public Builder clear() { super.clear(); playerId_ = 0L; bitField0_ = (bitField0_ & ~0x00000001); age_ = 0; bitField0_ = (bitField0_ & ~0x00000002); name_ = ""; bitField0_ = (bitField0_ & ~0x00000004); skills_ = java.util.Collections.emptyList();; bitField0_ = (bitField0_ & ~0x00000008); return this; } public Builder clone() { return create().mergeFrom(buildPartial()); } public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() { return com.proto.PlayerModule.PBPlayer.getDescriptor(); } public com.proto.PlayerModule.PBPlayer getDefaultInstanceForType() { return com.proto.PlayerModule.PBPlayer.getDefaultInstance(); } public com.proto.PlayerModule.PBPlayer build() { com.proto.PlayerModule.PBPlayer result = buildPartial(); if (!result.isInitialized()) { throw newUninitializedMessageException(result); } return result; } private com.proto.PlayerModule.PBPlayer buildParsed() throws com.google.protobuf.InvalidProtocolBufferException { com.proto.PlayerModule.PBPlayer result = buildPartial(); if (!result.isInitialized()) { throw newUninitializedMessageException( result).asInvalidProtocolBufferException(); } return result; } public com.proto.PlayerModule.PBPlayer buildPartial() { com.proto.PlayerModule.PBPlayer result = new com.proto.PlayerModule.PBPlayer(this); int from_bitField0_ = bitField0_; int to_bitField0_ = 0; if (((from_bitField0_ & 0x00000001) == 0x00000001)) { to_bitField0_ |= 0x00000001; } result.playerId_ = playerId_; if (((from_bitField0_ & 0x00000002) == 0x00000002)) { to_bitField0_ |= 0x00000002; } result.age_ = age_; if (((from_bitField0_ & 0x00000004) == 0x00000004)) { to_bitField0_ |= 0x00000004; } result.name_ = name_; if (((bitField0_ & 0x00000008) == 0x00000008)) { skills_ = java.util.Collections.unmodifiableList(skills_); bitField0_ = (bitField0_ & ~0x00000008); } result.skills_ = skills_; result.bitField0_ = to_bitField0_; onBuilt(); return result; } public Builder mergeFrom(com.google.protobuf.Message other) { if (other instanceof com.proto.PlayerModule.PBPlayer) { return mergeFrom((com.proto.PlayerModule.PBPlayer)other); } else { super.mergeFrom(other); return this; } } public Builder mergeFrom(com.proto.PlayerModule.PBPlayer other) { if (other == com.proto.PlayerModule.PBPlayer.getDefaultInstance()) return this; if (other.hasPlayerId()) { setPlayerId(other.getPlayerId()); } if (other.hasAge()) { setAge(other.getAge()); } if (other.hasName()) { setName(other.getName()); } if (!other.skills_.isEmpty()) { if (skills_.isEmpty()) { skills_ = other.skills_; bitField0_ = (bitField0_ & ~0x00000008); } else { ensureSkillsIsMutable(); skills_.addAll(other.skills_); } onChanged(); } this.mergeUnknownFields(other.getUnknownFields()); return this; } public final boolean isInitialized() { if (!hasPlayerId()) { return false; } if (!hasAge()) { return false; } if (!hasName()) { return false; } return true; } public Builder mergeFrom( com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException { com.google.protobuf.UnknownFieldSet.Builder unknownFields = com.google.protobuf.UnknownFieldSet.newBuilder( this.getUnknownFields()); while (true) { int tag = input.readTag(); switch (tag) { case 0: this.setUnknownFields(unknownFields.build()); onChanged(); return this; default: { if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) { this.setUnknownFields(unknownFields.build()); onChanged(); return this; } break; } case 8: { bitField0_ |= 0x00000001; playerId_ = input.readInt64(); break; } case 16: { bitField0_ |= 0x00000002; age_ = input.readInt32(); break; } case 26: { bitField0_ |= 0x00000004; name_ = input.readBytes(); break; } case 32: { ensureSkillsIsMutable(); skills_.add(input.readInt32()); break; } case 34: { int length = input.readRawVarint32(); int limit = input.pushLimit(length); while (input.getBytesUntilLimit() > 0) { addSkills(input.readInt32()); } input.popLimit(limit); break; } } } } private int bitField0_; // required int64 playerId = 1; private long playerId_ ; public boolean hasPlayerId() { return ((bitField0_ & 0x00000001) == 0x00000001); } public long getPlayerId() { return playerId_; } public Builder setPlayerId(long value) { bitField0_ |= 0x00000001; playerId_ = value; onChanged(); return this; } public Builder clearPlayerId() { bitField0_ = (bitField0_ & ~0x00000001); playerId_ = 0L; onChanged(); return this; } // required int32 age = 2; private int age_ ; public boolean hasAge() { return ((bitField0_ & 0x00000002) == 0x00000002); } public int getAge() { return age_; } public Builder setAge(int value) { bitField0_ |= 0x00000002; age_ = value; onChanged(); return this; } public Builder clearAge() { bitField0_ = (bitField0_ & ~0x00000002); age_ = 0; onChanged(); return this; } // required string name = 3; private java.lang.Object name_ = ""; public boolean hasName() { return ((bitField0_ & 0x00000004) == 0x00000004); } public String getName() { java.lang.Object ref = name_; if (!(ref instanceof String)) { String s = ((com.google.protobuf.ByteString) ref).toStringUtf8(); name_ = s; return s; } else { return (String) ref; } } public Builder setName(String value) { if (value == null) { throw new NullPointerException(); } bitField0_ |= 0x00000004; name_ = value; onChanged(); return this; } public Builder clearName() { bitField0_ = (bitField0_ & ~0x00000004); name_ = getDefaultInstance().getName(); onChanged(); return this; } void setName(com.google.protobuf.ByteString value) { bitField0_ |= 0x00000004; name_ = value; onChanged(); } // repeated int32 skills = 4; private java.util.List skills_ = java.util.Collections.emptyList();; private void ensureSkillsIsMutable() { if (!((bitField0_ & 0x00000008) == 0x00000008)) { skills_ = new java.util.ArrayList (skills_); bitField0_ |= 0x00000008; } } public java.util.List getSkillsList() { return java.util.Collections.unmodifiableList(skills_); } public int getSkillsCount() { return skills_.size(); } public int getSkills(int index) { return skills_.get(index); } public Builder setSkills( int index, int value) { ensureSkillsIsMutable(); skills_.set(index, value); onChanged(); return this; } public Builder addSkills(int value) { ensureSkillsIsMutable(); skills_.add(value); onChanged(); return this; } public Builder addAllSkills( java.lang.Iterable values) { ensureSkillsIsMutable(); super.addAll(values, skills_); onChanged(); return this; } public Builder clearSkills() { skills_ = java.util.Collections.emptyList();; bitField0_ = (bitField0_ & ~0x00000008); onChanged(); return this; } // @@protoc_insertion_point(builder_scope:PBPlayer) } static { defaultInstance = new PBPlayer(true); defaultInstance.initFields(); } // @@protoc_insertion_point(class_scope:PBPlayer) } public interface PBResourceOrBuilder extends com.google.protobuf.MessageOrBuilder { // required int64 gold = 1; boolean hasGold(); long getGold(); // required int32 energy = 2; boolean hasEnergy(); int getEnergy(); } public static final class PBResource extends com.google.protobuf.GeneratedMessage implements PBResourceOrBuilder { // Use PBResource.newBuilder() to construct. private PBResource(Builder builder) { super(builder); } private PBResource(boolean noInit) {} private static final PBResource defaultInstance; public static PBResource getDefaultInstance() { return defaultInstance; } public PBResource getDefaultInstanceForType() { return defaultInstance; } public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() { return com.proto.PlayerModule.internal_static_PBResource_descriptor; } protected com.google.protobuf.GeneratedMessage.FieldAccessorTable internalGetFieldAccessorTable() { return com.proto.PlayerModule.internal_static_PBResource_fieldAccessorTable; } private int bitField0_; // required int64 gold = 1; public static final int GOLD_FIELD_NUMBER = 1; private long gold_; public boolean hasGold() { return ((bitField0_ & 0x00000001) == 0x00000001); } public long getGold() { return gold_; } // required int32 energy = 2; public static final int ENERGY_FIELD_NUMBER = 2; private int energy_; public boolean hasEnergy() { return ((bitField0_ & 0x00000002) == 0x00000002); } public int getEnergy() { return energy_; } private void initFields() { gold_ = 0L; energy_ = 0; } private byte memoizedIsInitialized = -1; public final boolean isInitialized() { byte isInitialized = memoizedIsInitialized; if (isInitialized != -1) return isInitialized == 1; if (!hasGold()) { memoizedIsInitialized = 0; return false; } if (!hasEnergy()) { memoizedIsInitialized = 0; return false; } memoizedIsInitialized = 1; return true; } public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException { getSerializedSize(); if (((bitField0_ & 0x00000001) == 0x00000001)) { output.writeInt64(1, gold_); } if (((bitField0_ & 0x00000002) == 0x00000002)) { output.writeInt32(2, energy_); } getUnknownFields().writeTo(output); } private int memoizedSerializedSize = -1; public int getSerializedSize() { int size = memoizedSerializedSize; if (size != -1) return size; size = 0; if (((bitField0_ & 0x00000001) == 0x00000001)) { size += com.google.protobuf.CodedOutputStream .computeInt64Size(1, gold_); } if (((bitField0_ & 0x00000002) == 0x00000002)) { size += com.google.protobuf.CodedOutputStream .computeInt32Size(2, energy_); } size += getUnknownFields().getSerializedSize(); memoizedSerializedSize = size; return size; } private static final long serialVersionUID = 0L; @java.lang.Override protected java.lang.Object writeReplace() throws java.io.ObjectStreamException { return super.writeReplace(); } public static com.proto.PlayerModule.PBResource parseFrom( com.google.protobuf.ByteString data) throws com.google.protobuf.InvalidProtocolBufferException { return newBuilder().mergeFrom(data).buildParsed(); } public static com.proto.PlayerModule.PBResource parseFrom( com.google.protobuf.ByteString data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException { return newBuilder().mergeFrom(data, extensionRegistry) .buildParsed(); } public static com.proto.PlayerModule.PBResource parseFrom(byte[] data) throws com.google.protobuf.InvalidProtocolBufferException { return newBuilder().mergeFrom(data).buildParsed(); } public static com.proto.PlayerModule.PBResource parseFrom( byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException { return newBuilder().mergeFrom(data, extensionRegistry) .buildParsed(); } public static com.proto.PlayerModule.PBResource parseFrom(java.io.InputStream input) throws java.io.IOException { return newBuilder().mergeFrom(input).buildParsed(); } public static com.proto.PlayerModule.PBResource parseFrom( java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException { return newBuilder().mergeFrom(input, extensionRegistry) .buildParsed(); } public static com.proto.PlayerModule.PBResource parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException { Builder builder = newBuilder(); if (builder.mergeDelimitedFrom(input)) { return builder.buildParsed(); } else { return null; } } public static com.proto.PlayerModule.PBResource parseDelimitedFrom( java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException { Builder builder = newBuilder(); if (builder.mergeDelimitedFrom(input, extensionRegistry)) { return builder.buildParsed(); } else { return null; } } public static com.proto.PlayerModule.PBResource parseFrom( com.google.protobuf.CodedInputStream input) throws java.io.IOException { return newBuilder().mergeFrom(input).buildParsed(); } public static com.proto.PlayerModule.PBResource parseFrom( com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException { return newBuilder().mergeFrom(input, extensionRegistry) .buildParsed(); } public static Builder newBuilder() { return Builder.create(); } public Builder newBuilderForType() { return newBuilder(); } public static Builder newBuilder(com.proto.PlayerModule.PBResource prototype) { return newBuilder().mergeFrom(prototype); } public Builder toBuilder() { return newBuilder(this); } @java.lang.Override protected Builder newBuilderForType( com.google.protobuf.GeneratedMessage.BuilderParent parent) { Builder builder = new Builder(parent); return builder; } public static final class Builder extends com.google.protobuf.GeneratedMessage.Builder implements com.proto.PlayerModule.PBResourceOrBuilder { public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() { return com.proto.PlayerModule.internal_static_PBResource_descriptor; } protected com.google.protobuf.GeneratedMessage.FieldAccessorTable internalGetFieldAccessorTable() { return com.proto.PlayerModule.internal_static_PBResource_fieldAccessorTable; } // Construct using com.proto.PlayerModule.PBResource.newBuilder() private Builder() { maybeForceBuilderInitialization(); } private Builder(BuilderParent parent) { super(parent); maybeForceBuilderInitialization(); } private void maybeForceBuilderInitialization() { if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) { } } private static Builder create() { return new Builder(); } public Builder clear() { super.clear(); gold_ = 0L; bitField0_ = (bitField0_ & ~0x00000001); energy_ = 0; bitField0_ = (bitField0_ & ~0x00000002); return this; } public Builder clone() { return create().mergeFrom(buildPartial()); } public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() { return com.proto.PlayerModule.PBResource.getDescriptor(); } public com.proto.PlayerModule.PBResource getDefaultInstanceForType() { return com.proto.PlayerModule.PBResource.getDefaultInstance(); } public com.proto.PlayerModule.PBResource build() { com.proto.PlayerModule.PBResource result = buildPartial(); if (!result.isInitialized()) { throw newUninitializedMessageException(result); } return result; } private com.proto.PlayerModule.PBResource buildParsed() throws com.google.protobuf.InvalidProtocolBufferException { com.proto.PlayerModule.PBResource result = buildPartial(); if (!result.isInitialized()) { throw newUninitializedMessageException( result).asInvalidProtocolBufferException(); } return result; } public com.proto.PlayerModule.PBResource buildPartial() { com.proto.PlayerModule.PBResource result = new com.proto.PlayerModule.PBResource(this); int from_bitField0_ = bitField0_; int to_bitField0_ = 0; if (((from_bitField0_ & 0x00000001) == 0x00000001)) { to_bitField0_ |= 0x00000001; } result.gold_ = gold_; if (((from_bitField0_ & 0x00000002) == 0x00000002)) { to_bitField0_ |= 0x00000002; } result.energy_ = energy_; result.bitField0_ = to_bitField0_; onBuilt(); return result; } public Builder mergeFrom(com.google.protobuf.Message other) { if (other instanceof com.proto.PlayerModule.PBResource) { return mergeFrom((com.proto.PlayerModule.PBResource)other); } else { super.mergeFrom(other); return this; } } public Builder mergeFrom(com.proto.PlayerModule.PBResource other) { if (other == com.proto.PlayerModule.PBResource.getDefaultInstance()) return this; if (other.hasGold()) { setGold(other.getGold()); } if (other.hasEnergy()) { setEnergy(other.getEnergy()); } this.mergeUnknownFields(other.getUnknownFields()); return this; } public final boolean isInitialized() { if (!hasGold()) { return false; } if (!hasEnergy()) { return false; } return true; } public Builder mergeFrom( com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException { com.google.protobuf.UnknownFieldSet.Builder unknownFields = com.google.protobuf.UnknownFieldSet.newBuilder( this.getUnknownFields()); while (true) { int tag = input.readTag(); switch (tag) { case 0: this.setUnknownFields(unknownFields.build()); onChanged(); return this; default: { if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) { this.setUnknownFields(unknownFields.build()); onChanged(); return this; } break; } case 8: { bitField0_ |= 0x00000001; gold_ = input.readInt64(); break; } case 16: { bitField0_ |= 0x00000002; energy_ = input.readInt32(); break; } } } } private int bitField0_; // required int64 gold = 1; private long gold_ ; public boolean hasGold() { return ((bitField0_ & 0x00000001) == 0x00000001); } public long getGold() { return gold_; } public Builder setGold(long value) { bitField0_ |= 0x00000001; gold_ = value; onChanged(); return this; } public Builder clearGold() { bitField0_ = (bitField0_ & ~0x00000001); gold_ = 0L; onChanged(); return this; } // required int32 energy = 2; private int energy_ ; public boolean hasEnergy() { return ((bitField0_ & 0x00000002) == 0x00000002); } public int getEnergy() { return energy_; } public Builder setEnergy(int value) { bitField0_ |= 0x00000002; energy_ = value; onChanged(); return this; } public Builder clearEnergy() { bitField0_ = (bitField0_ & ~0x00000002); energy_ = 0; onChanged(); return this; } // @@protoc_insertion_point(builder_scope:PBResource) } static { defaultInstance = new PBResource(true); defaultInstance.initFields(); } // @@protoc_insertion_point(class_scope:PBResource) } private static com.google.protobuf.Descriptors.Descriptor internal_static_PBPlayer_descriptor; private static com.google.protobuf.GeneratedMessage.FieldAccessorTable internal_static_PBPlayer_fieldAccessorTable; private static com.google.protobuf.Descriptors.Descriptor internal_static_PBResource_descriptor; private static com.google.protobuf.GeneratedMessage.FieldAccessorTable internal_static_PBResource_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\022proto/player.proto\"G\n\010PBPlayer\022\020\n\010play" + "erId\030\001 \002(\003\022\013\n\003age\030\002 \002(\005\022\014\n\004name\030\003 \002(\t\022\016\n" + "\006skills\030\004 \003(\005\"*\n\nPBResource\022\014\n\004gold\030\001 \002(" + "\003\022\016\n\006energy\030\002 \002(\005B\031\n\tcom.protoB\014PlayerMo" + "dule" }; com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner = new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() { public com.google.protobuf.ExtensionRegistry assignDescriptors( com.google.protobuf.Descriptors.FileDescriptor root) { descriptor = root; internal_static_PBPlayer_descriptor = getDescriptor().getMessageTypes().get(0); internal_static_PBPlayer_fieldAccessorTable = new com.google.protobuf.GeneratedMessage.FieldAccessorTable( internal_static_PBPlayer_descriptor, new java.lang.String[] { "PlayerId", "Age", "Name", "Skills", }, com.proto.PlayerModule.PBPlayer.class, com.proto.PlayerModule.PBPlayer.Builder.class); internal_static_PBResource_descriptor = getDescriptor().getMessageTypes().get(1); internal_static_PBResource_fieldAccessorTable = new com.google.protobuf.GeneratedMessage.FieldAccessorTable( internal_static_PBResource_descriptor, new java.lang.String[] { "Gold", "Energy", }, com.proto.PlayerModule.PBResource.class, com.proto.PlayerModule.PBResource.Builder.class); return null; } }; com.google.protobuf.Descriptors.FileDescriptor .internalBuildGeneratedFileFrom(descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] { }, assigner); } // @@protoc_insertion_point(outer_class_scope)} package com.proto;import java.util.Arrays;import com.proto.PlayerModule.PBPlayer;import com.proto.PlayerModule.PBPlayer.Builder;/** * protobuf学习 * * */public class PB2Bytes { public static void main(String[] args) throws Exception { byte[] bytes = toBytes(); toPlayer(bytes); } /** * 序列化 */ public static byte[] toBytes(){ //获取一个PBPlayer的构造器 Builder builder = PlayerModule.PBPlayer.newBuilder(); //设置数据 builder.setPlayerId(101).setAge(20).setName("peter").addSkills(1001); //构造出对象 PBPlayer player = builder.build(); //序列化成字节数组 byte[] byteArray = player.toByteArray(); System.out.println(Arrays.toString(byteArray)); return byteArray; } /** * 反序列化 * @param bs * @throws Exception */ public static void toPlayer(byte[] bs) throws Exception{ PBPlayer player = PlayerModule.PBPlayer.parseFrom(bs); System.out.println("playerId:" + player.getPlayerId()); System.out.println("age:" + player.getAge()); System.out.println("name:" + player.getName()); System.out.println("skills:" + (Arrays.toString(player.getSkillsList().toArray()))); }} 序列号后的对象大小
[8, 101, 16, 20, 26, 5, 112, 101, 116, 101, 114, 32, -23, 7]
package com.java;import java.io.Serializable;import java.util.ArrayList;import java.util.List;/** * 玩家对象 * * */public class Player implements Serializable{ /** * */ private static final long serialVersionUID = -5248069984631225347L; public Player(long playerId, int age, String name) { this.playerId = playerId; this.age = age; this.name = name; } private long playerId; private int age; private String name; private List skills = new ArrayList<>(); public long getPlayerId() { return playerId; } public void setPlayerId(long playerId) { this.playerId = playerId; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public List getSkills() { return skills; } public void setSkills(List skills) { this.skills = skills; }} package com.java;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.util.Arrays;public class JAVA2Bytes { public static void main(String[] args) throws Exception { byte[] bytes = toBytes(); toPlayer(bytes); } /** * 序列化 * @throws IOException */ public static byte[] toBytes() throws IOException{ Player player = new Player(101, 20, "peter"); player.getSkills().add(1001); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream); //写入对象 objectOutputStream.writeObject(player); //获取 字节数组 byte[] byteArray = byteArrayOutputStream.toByteArray(); System.out.println(Arrays.toString(byteArray)); return byteArray; } /** * 反序列化 * @param bs * @throws Exception */ public static void toPlayer(byte[] bs) throws Exception{ ObjectInputStream inputStream = new ObjectInputStream(new ByteArrayInputStream(bs)); Player player = (Player)inputStream.readObject(); //打印 System.out.println("playerId:" + player.getPlayerId()); System.out.println("age:" + player.getAge()); System.out.println("name:" + player.getName()); System.out.println("skills:" + (Arrays.toString(player.getSkills().toArray()))); }} 转载地址：http://cclnn.baihongyu.com/