Protocol Buffer 使用-copy

概述
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。

https://github.com/csy512889371/learndemo/tree/master/netty/ProtoTest

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]
例子
编写proto 配置
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=./src

pause
生成的java代码如下

// 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();
}
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<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)
}
使用protocol 序列化 和反序列化
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]
java 实现虚拟化与反序列化
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<Integer> 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<Integer> getSkills() {
return skills;
}

public void setSkills(List<Integer> 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())));
}

————————————————
版权声明：本文为CSDN博主「chenshiying007」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_27384769/article/details/80694205