protobuf生成java代码

protobuf官方包下载：https://github.com/protocolbuffers/protobuf/releases/tag/v3.11.1

1、Idea中安装protobuf插件，重启Idea

2、idea中新建maven项目protobuf-demo

3、pom.xml中添加如下依赖

    UTF-8


   
        com.google.protobuf
        protobuf-java
        3.6.1
   
   
        junit
        junit
        4.13
        test
   


   
       
            kr.motd.maven
            os-maven-plugin
            1.4.1.Final
       
   
   
       
            org.xolstice.maven.plugins
            protobuf-maven-plugin
            0.5.0
           
               
                    com.google.protobuf:protoc:3.1.0:exe:${os.detected.classifier}
               
                grpc-java
           
           
               
                   
                        compile
                        compile-custom
                   
               
           
       
   

4、在idea中编写proto文件,目录结构如下

 

内容如下：

syntax = "proto3";
option java_package = "com.black.model";
option java_outer_classname = "PersonModel";
message Person {
    int32 id = 1;
    string name = 2;
    string email = 3;
}
5、生成java

 

6、测试代码

public class PersonModelTest {
    public static void main(String[] args) throws InvalidProtocolBufferException {
        PersonModel.Person.Builder builder= PersonModel.Person.newBuilder();
        builder.setId(1);
        builder.setEmail("lee@sunvalley.com.cn");
        builder.setName("lee");

        PersonModel.Person person= builder.build();
        System.out.print("====before===="+person);
        System.out.println("==================");
        for(Byte b:person.toByteArray()){
            System.out.print(b);
        }
        System.out.println("==================");
        byte[] byteArray= person.toByteArray();
        PersonModel.Person p2 = PersonModel.Person.parseFrom(byteArray);
        System.out.println("=========反序列化生成对象,转换之后==========");
        System.out.println(p2.getId()+","+p2.getEmail()+","+p2.getName());
    }
}