Protocol Buffer序列化对比Java序列化.
初识
Protocol Buff是谷歌推出的一种序列化协议. 而Java序列化协议也是一种协议.
两者的目的是, 将对象序列化成字节数组, 或者说是二进制数据, 那么他们之间有什么差异呢.
proto对象
要使用PB, 我们需要定义一个proto对象, 其支持的数据类型如下:
Protobuf定义了一套基本数据类型。几乎都可以映射到C++\Java等语言的基础数据类型.
protobuf 数据类型 |
描述 |
打包 |
C++语言映射 |
bool |
布尔类型 |
1字节 |
bool |
double |
64位浮点数 |
N |
double |
float |
32为浮点数 |
N |
float |
int32 |
32位整数、 |
N |
int |
uin32 |
无符号32位整数 |
N |
unsigned int |
int64 |
64位整数 |
N |
__int64 |
uint64 |
64为无符号整 |
N |
unsigned __int64 |
sint32 |
32位整数,处理负数效率更高 |
N |
int32 |
sing64 |
64位整数 处理负数效率更高 |
N |
__int64 |
fixed32 |
32位无符号整数 |
4 |
unsigned int32 |
fixed64 |
64位无符号整数 |
8 |
unsigned __int64 |
sfixed32 |
32位整数、能以更高的效率处理负数 |
4 |
unsigned int32 |
sfixed64 |
64为整数 |
8 |
unsigned __int64 |
string |
只能处理 ASCII字符 |
N |
std::string |
bytes |
用于处理多字节的语言字符、如中文 |
N |
std::string |
enum |
可以包含一个用户自定义的枚举类型uint32 |
N(uint32) |
enum |
message |
可以包含一个用户自定义的消息类型 |
N |
object of class |
proto对象结构类似于java的class, 在同一个module里, 定义了两个类, PBPlayer 和 PBResource, 各自拥有一些成员变量.
- 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;
- }
然后用protoc.exe将proto对象转为java对象, 打开cmd, 运行如下命令:
- protoc ./proto/*.proto --java_out=./src
生成的java对象比较庞大, 我们不需要细究里面代码, 直接调用即可.
- // Generated by the protocol buffer compiler. DO NOT EDIT!
- // source: proto/player.proto
- package 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<java.lang.Integer> 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<java.lang.Integer> skills_;
- public java.util.List<java.lang.Integer>
- 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<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<java.lang.Integer> skills_ = java.util.Collections.emptyList();;
- private void ensureSkillsIsMutable() {
- if (!((bitField0_ & 0x00000008) == 0x00000008)) {
- skills_ = new java.util.ArrayList<java.lang.Integer>(skills_);
- bitField0_ |= 0x00000008;
- }
- }
- public java.util.List<java.lang.Integer>
- 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<? extends java.lang.Integer> 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();
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- 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;
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- public static com.proto.PlayerModule.PBResource parseDelimitedFrom(
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- Builder builder = newBuilder();
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- return null;
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- 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)
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- 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<Builder>
- implements com.proto.PlayerModule.PBResourceOrBuilder {
- public static final com.google.protobuf.Descriptors.Descriptor
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- return com.proto.PlayerModule.internal_static_PBResource_descriptor;
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- protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
- internalGetFieldAccessorTable() {
- return com.proto.PlayerModule.internal_static_PBResource_fieldAccessorTable;
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- // Construct using com.proto.PlayerModule.PBResource.newBuilder()
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- com.proto.PlayerModule.PBResource result = buildPartial();
- if (!result.isInitialized()) {
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- return result;
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- com.proto.PlayerModule.PBResource result = new com.proto.PlayerModule.PBResource(this);
- int from_bitField0_ = bitField0_;
- int to_bitField0_ = 0;
- if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
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- if (((from_bitField0_ & 0x00000002) == 0x00000002)) {
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- result.energy_ = energy_;
- result.bitField0_ = to_bitField0_;
- onBuilt();
- return result;
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- public Builder mergeFrom(com.google.protobuf.Message other) {
- if (other instanceof com.proto.PlayerModule.PBResource) {
- return mergeFrom((com.proto.PlayerModule.PBResource)other);
- } else {
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- if (other == com.proto.PlayerModule.PBResource.getDefaultInstance()) return this;
- if (other.hasGold()) {
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- public final boolean isInitialized() {
- if (!hasGold()) {
- return false;
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- if (!hasEnergy()) {
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- return true;
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- public Builder mergeFrom(
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- com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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- gold_ = input.readInt64();
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- case 16: {
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- energy_ = input.readInt32();
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- private int bitField0_;
- // required int64 gold = 1;
- private long gold_ ;
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- gold_ = value;
- onChanged();
- return this;
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- 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) {
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- energy_ = value;
- onChanged();
- return this;
- }
- public Builder clearEnergy() {
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- 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;
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- 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"
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- com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
- new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
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- com.google.protobuf.Descriptors.FileDescriptor root) {
- descriptor = root;
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- 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,
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- com.google.protobuf.Descriptors.FileDescriptor
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PB序列化
//获取一个PBPlayer的构造器
Builder builder = PlayerModule.PBPlayer.newBuilder();
//设置数据
builder.setPlayerId(101).setAge(20).setName("neil").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;
运行结果, 一串非常短的byte数组, 远远比json, xml, java序列化要短.
[8, 101, 16, 20, 26, 4, 110, 101, 105, 108, 32, -23, 7]
PB反序列化
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())));
}
运行结果
playerId:101
age:20
name:neil
skills:[1001]
Java序列化
定义player pojo.
private long playerId;
private int age;
private String name;
private List<Integer> skills = new ArrayList<>();
Player player = new Player(101, 20, "neil");
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;
运行结果, 非常长的一个byte数组
[-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, 4, 110, 101, 105, 108, 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]
Java反序列化
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())));
运行结果
playerId:101
age:20
name:neil
skills:[1001]
对比
经过上面运行结果的对比可以看出来, PB是一个非常高效的序列化协议.
相对于Java这种数据类型固定长度的序列化(int 4字节, long 8字节), PB提供了可伸缩性的数据类型(int 1-5字节).
当数据比较小的时候int只占用1个字节, 而大部分场景下, 数据都是很小的, 不然jdk本身也不会缓存 -127~128了.
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