图文介绍IDEA开发环境安装protobuf插件，生成java代码

        protocal Buffers(简称protobuf)是谷歌的一项技术，用于结构化的数据序列化、反序列化，常用于RPC 系统 和持续数据存储系统。

        其类似于XML生成和解析，但protobuf的效率高于XML，不过protobuf生成的是字节码，可读性比XML差，类似的序列化协议还有json、以及Java的Serializable等。

        很适合做数据存储或 RPC 数据交换格式。可用于通讯协议、数据存储等领域的语言无关、平台无关、可扩展的序列化结构数据格式。

       打开IDEA  :

       File->Settings->Plugins

       安装GenProtobuf

 安装成功标志：

 三、搭建DEMO项目：

在main下创建proto目录

pom.xml:


com.google.protobuf
protobuf-java
3.5.1



com.google.protobuf
protobuf-java-util
3.5.1



io.grpc
grpc-all
1.11.0





kr.motd.maven
os-maven-plugin
1.5.0.Final




org.xolstice.maven.plugins
protobuf-maven-plugin
0.5.0


com.google.protobuf:protoc:3.1.0:exe:${os.detected.classifier}

grpc-java

io.grpc:protoc-gen-grpc-java:1.11.0:exe:${os.detected.classifier}





compile
compile-custom







 编辑proto文件，demo如下，proto文件的语法结构，这里不做赘述，老铁们可以查阅相关的资料。

syntax = "proto3";
//生成文件所在包名
option java_package = "com.jason.seria.protobuf";
//生成的java文件名
option java_outer_classname = "ProtoDemo";
message Student {
string name = 1;
int32 age = 2;
}

代码生成：

 生成的java文件：

// Generated by the protocol buffer compiler. DO NOT EDIT!
// source: Stdent.proto
package com.jason.seria.protobuf;
public final class ProtoDemo {
private ProtoDemo() {}
public static void registerAllExtensions(
com.google.protobuf.ExtensionRegistryLite registry) {
}
public static void registerAllExtensions(
com.google.protobuf.ExtensionRegistry registry) {
registerAllExtensions(
(com.google.protobuf.ExtensionRegistryLite) registry);
}
public interface StudentOrBuilder extends
// @@protoc_insertion_point(interface_extends:Student)
com.google.protobuf.MessageOrBuilder {
/**
* optional string name = 1;
*/
String getName();
/**
* optional string name = 1;
*/
com.google.protobuf.ByteString
getNameBytes();
/**
* optional int32 age = 2;
*/
int getAge();
}
/**
* Protobuf type {@code Student}
*/
public static final class Student extends
com.google.protobuf.GeneratedMessageV3 implements
// @@protoc_insertion_point(message_implements:Student)
StudentOrBuilder {
// Use Student.newBuilder() to construct.
private Student(com.google.protobuf.GeneratedMessageV3.Builder builder) {
super(builder);
}
private Student() {
name_ = "";
age_ = 0;
}
@Override
public final com.google.protobuf.UnknownFieldSet
getUnknownFields() {
return com.google.protobuf.UnknownFieldSet.getDefaultInstance();
}
private Student(
com.google.protobuf.CodedInputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
this();
int mutable_bitField0_ = 0;
try {
boolean dOne= false;
while (!done) {
int tag = input.readTag();
switch (tag) {
case 0:
dOne= true;
break;
default: {
if (!input.skipField(tag)) {
dOne= true;
}
break;
}
case 10: {
String s = input.readStringRequireUtf8();
name_ = s;
break;
}
case 16: {
age_ = input.readInt32();
break;
}
}
}
} catch (com.google.protobuf.InvalidProtocolBufferException e) {
throw e.setUnfinishedMessage(this);
} catch (java.io.IOException e) {
throw new com.google.protobuf.InvalidProtocolBufferException(
e).setUnfinishedMessage(this);
} finally {
makeExtensionsImmutable();
}
}
public static final com.google.protobuf.Descriptors.Descriptor
getDescriptor() {
return ProtoDemo.internal_static_Student_descriptor;
}
protected FieldAccessorTable
internalGetFieldAccessorTable() {
return ProtoDemo.internal_static_Student_fieldAccessorTable
.ensureFieldAccessorsInitialized(
Student.class, Builder.class);
}
public static final int NAME_FIELD_NUMBER = 1;
private volatile Object name_;
/**
* optional string name = 1;
*/
public String getName() {
Object ref = name_;
if (ref instanceof String) {
return (String) ref;
} else {
com.google.protobuf.ByteString bs =
(com.google.protobuf.ByteString) ref;
String s = bs.toStringUtf8();
name_ = s;
return s;
}
}
/**
* optional string name = 1;
*/
public com.google.protobuf.ByteString
getNameBytes() {
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;
}
}
public static final int AGE_FIELD_NUMBER = 2;
private int age_;
/**
* optional int32 age = 2;
*/
public int getAge() {
return age_;
}
private byte memoizedIsInitialized = -1;
public final boolean isInitialized() {
byte isInitialized = memoizedIsInitialized;
if (isInitialized == 1) return true;
if (isInitialized == 0) return false;
memoizedIsInitialized = 1;
return true;
}
public void writeTo(com.google.protobuf.CodedOutputStream output)
throws java.io.IOException {
if (!getNameBytes().isEmpty()) {
com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
}
if (age_ != 0) {
output.writeInt32(2, age_);
}
}
public int getSerializedSize() {
int size = memoizedSize;
if (size != -1) return size;
size = 0;
if (!getNameBytes().isEmpty()) {
size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
}
if (age_ != 0) {
size += com.google.protobuf.CodedOutputStream
.computeInt32Size(2, age_);
}
memoizedSize = size;
return size;
}
private static final long serialVersiOnUID= 0L;
@Override
public boolean equals(final Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof Student)) {
return super.equals(obj);
}
Student other = (Student) obj;
boolean result = true;
result = result && getName()
.equals(other.getName());
result = result && (getAge()
== other.getAge());
return result;
}
@Override
public int hashCode() {
if (memoizedHashCode != 0) {
return memoizedHashCode;
}
int hash = 41;
hash = (19 * hash) + getDescriptorForType().hashCode();
hash = (37 * hash) + NAME_FIELD_NUMBER;
hash = (53 * hash) + getName().hashCode();
hash = (37 * hash) + AGE_FIELD_NUMBER;
hash = (53 * hash) + getAge();
hash = (29 * hash) + unknownFields.hashCode();
memoizedHashCode = hash;
return hash;
}
public static Student parseFrom(
com.google.protobuf.ByteString data)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data);
}
public static Student parseFrom(
com.google.protobuf.ByteString data,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data, extensionRegistry);
}
public static Student parseFrom(byte[] data)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data);
}
public static Student parseFrom(
byte[] data,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data, extensionRegistry);
}
public static Student parseFrom(java.io.InputStream input)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseWithIOException(PARSER, input);
}
public static Student parseFrom(
java.io.InputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseWithIOException(PARSER, input, extensionRegistry);
}
public static Student parseDelimitedFrom(java.io.InputStream input)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseDelimitedWithIOException(PARSER, input);
}
public static Student parseDelimitedFrom(
java.io.InputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseDelimitedWithIOException(PARSER, input, extensionRegistry);
}
public static Student parseFrom(
com.google.protobuf.CodedInputStream input)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseWithIOException(PARSER, input);
}
public static Student parseFrom(
com.google.protobuf.CodedInputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseWithIOException(PARSER, input, extensionRegistry);
}
public Builder newBuilderForType() { return newBuilder(); }
public static Builder newBuilder() {
return DEFAULT_INSTANCE.toBuilder();
}
public static Builder newBuilder(Student prototype) {
return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
}
public Builder toBuilder() {
return this == DEFAULT_INSTANCE
? new Builder() : new Builder().mergeFrom(this);
}
@Override
protected Builder newBuilderForType(
BuilderParent parent) {
Builder builder = new Builder(parent);
return builder;
}
/**
* Protobuf type {@code Student}
*/
public static final class Builder extends
com.google.protobuf.GeneratedMessageV3.Builder implements
// @@protoc_insertion_point(builder_implements:Student)
StudentOrBuilder {
public static final com.google.protobuf.Descriptors.Descriptor
getDescriptor() {
return ProtoDemo.internal_static_Student_descriptor;
}
protected FieldAccessorTable
internalGetFieldAccessorTable() {
return ProtoDemo.internal_static_Student_fieldAccessorTable
.ensureFieldAccessorsInitialized(
Student.class, Builder.class);
}
// Construct using com.jason.seria.protobuf.ProtoDemo.Student.newBuilder()
private Builder() {
maybeForceBuilderInitialization();
}
private Builder(
BuilderParent parent) {
super(parent);
maybeForceBuilderInitialization();
}
private void maybeForceBuilderInitialization() {
if (com.google.protobuf.GeneratedMessageV3
.alwaysUseFieldBuilders) {
}
}
public Builder clear() {
super.clear();
name_ = "";
age_ = 0;
return this;
}
public com.google.protobuf.Descriptors.Descriptor
getDescriptorForType() {
return ProtoDemo.internal_static_Student_descriptor;
}
public Student getDefaultInstanceForType() {
return Student.getDefaultInstance();
}
public Student build() {
Student result = buildPartial();
if (!result.isInitialized()) {
throw newUninitializedMessageException(result);
}
return result;
}
public Student buildPartial() {
Student result = new Student(this);
result.name_ = name_;
result.age_ = age_;
onBuilt();
return result;
}
public Builder clone() {
return (Builder) super.clone();
}
public Builder setField(
com.google.protobuf.Descriptors.FieldDescriptor field,
Object value) {
return (Builder) super.setField(field, value);
}
public Builder clearField(
com.google.protobuf.Descriptors.FieldDescriptor field) {
return (Builder) super.clearField(field);
}
public Builder clearOneof(
com.google.protobuf.Descriptors.OneofDescriptor oneof) {
return (Builder) super.clearOneof(oneof);
}
public Builder setRepeatedField(
com.google.protobuf.Descriptors.FieldDescriptor field,
int index, Object value) {
return (Builder) super.setRepeatedField(field, index, value);
}
public Builder addRepeatedField(
com.google.protobuf.Descriptors.FieldDescriptor field,
Object value) {
return (Builder) super.addRepeatedField(field, value);
}
public Builder mergeFrom(com.google.protobuf.Message other) {
if (other instanceof Student) {
return mergeFrom((Student)other);
} else {
super.mergeFrom(other);
return this;
}
}
public Builder mergeFrom(Student other) {
if (other == Student.getDefaultInstance()) return this;
if (!other.getName().isEmpty()) {
name_ = other.name_;
onChanged();
}
if (other.getAge() != 0) {
setAge(other.getAge());
}
onChanged();
return this;
}
public final boolean isInitialized() {
return true;
}
public Builder mergeFrom(
com.google.protobuf.CodedInputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
Student parsedMessage = null;
try {
parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
} catch (com.google.protobuf.InvalidProtocolBufferException e) {
parsedMessage = (Student) e.getUnfinishedMessage();
throw e.unwrapIOException();
} finally {
if (parsedMessage != null) {
mergeFrom(parsedMessage);
}
}
return this;
}
private Object name_ = "";
/**
* optional string name = 1;
*/
public String getName() {
Object ref = name_;
if (!(ref instanceof String)) {
com.google.protobuf.ByteString bs =
(com.google.protobuf.ByteString) ref;
String s = bs.toStringUtf8();
name_ = s;
return s;
} else {
return (String) ref;
}
}
/**
* optional string name = 1;
*/
public com.google.protobuf.ByteString
getNameBytes() {
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;
}
}
/**
* optional string name = 1;
*/
public Builder setName(
String value) {
if (value == null) {
throw new NullPointerException();
}
name_ = value;
onChanged();
return this;
}
/**
* optional string name = 1;
*/
public Builder clearName() {

name_ = getDefaultInstance().getName();
onChanged();
return this;
}
/**
* optional string name = 1;
*/
public Builder setNameBytes(
com.google.protobuf.ByteString value) {
if (value == null) {
throw new NullPointerException();
}
checkByteStringIsUtf8(value);

name_ = value;
onChanged();
return this;
}
private int age_ ;
/**
* optional int32 age = 2;
*/
public int getAge() {
return age_;
}
/**
* optional int32 age = 2;
*/
public Builder setAge(int value) {

age_ = value;
onChanged();
return this;
}
/**
* optional int32 age = 2;
*/
public Builder clearAge() {

age_ = 0;
onChanged();
return this;
}
public final Builder setUnknownFields(
final com.google.protobuf.UnknownFieldSet unknownFields) {
return this;
}
public final Builder mergeUnknownFields(
final com.google.protobuf.UnknownFieldSet unknownFields) {
return this;
}
// @@protoc_insertion_point(builder_scope:Student)
}
// @@protoc_insertion_point(class_scope:Student)
private static final Student DEFAULT_INSTANCE;
static {
DEFAULT_INSTANCE = new Student();
}
public static Student getDefaultInstance() {
return DEFAULT_INSTANCE;
}
private static final com.google.protobuf.Parser
PARSER = new com.google.protobuf.AbstractParser() {
public Student parsePartialFrom(
com.google.protobuf.CodedInputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return new Student(input, extensionRegistry);
}
};
public static com.google.protobuf.Parser parser() {
return PARSER;
}
@Override
public com.google.protobuf.Parser getParserForType() {
return PARSER;
}
public Student getDefaultInstanceForType() {
return DEFAULT_INSTANCE;
}
}
private static final com.google.protobuf.Descriptors.Descriptor
internal_static_Student_descriptor;
private static final
com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
internal_static_Student_fieldAccessorTable;
public static com.google.protobuf.Descriptors.FileDescriptor
getDescriptor() {
return descriptor;
}
private static com.google.protobuf.Descriptors.FileDescriptor
descriptor;
static {
String[] descriptorData = {
"\n\014Stdent.proto\"$\n\007Student\022\014\n\004name\030\001 \001(\t\022" +
"\013\n\003age\030\002 \001(\005B%\n\030com.jason.seria.protobuf" +
"B\tProtoDemob\006proto3"
};
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;
return null;
}
};
com.google.protobuf.Descriptors.FileDescriptor
.internalBuildGeneratedFileFrom(descriptorData,
new com.google.protobuf.Descriptors.FileDescriptor[] {
}, assigner);
internal_static_Student_descriptor =
getDescriptor().getMessageTypes().get(0);
internal_static_Student_fieldAccessorTable = new
com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
internal_static_Student_descriptor,
new String[] { "Name", "Age", });
}
// @@protoc_insertion_point(outer_class_scope)
}