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This article mainly explains "how to write an optional .proto file". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to write an optional .proto file".

Protobuf1. Why use protobuf

Protobuf is a structured data serialization framework.

two。 What is serialization?

Convert objects or structured data into a data format that is easy to store and transfer. To ensure that the serialized results can be re-established back to the original object or data.

3. Why Protobuf is faster and smaller

Convert to binary with compression

4 how to write .proto file

Keyword

Proto3 deleted optional and required

Syntax = "proto2"

Package tutorial

Option java_package = "com.example.tutorial"

Option java_outer_classname = "AddressBookProtos"

Message Person {

Required string name = 1

Required int32 id = 2

Optional string email = 3

Enum PhoneType {

MOBILE = 0

HOME = 1

WORK = 2

}

Message PhoneNumber {

Required string number = 1

Optional PhoneType type = 2 [default = HOME]

}

Repeated PhoneNumber phones = 4

}

Message AddressBook {

Repeated Person people = 1

}

5 comparison of common data types with java

Proto

Java

Int32

Int

String

String

Double

Double

Enum

Enum

Int 64

Long

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