在 Java 中使用 protobuf

從 https://github.com/google/protobuf/releases 下載編譯器，並設置環境變量。

創建java項目添加protobuf-java引用

compile group: 'com.google.protobuf', name: 'protobuf-java', version: '3.2.0'

編寫.proto文件

syntax = "proto3";

message Person {
    int32 id = 1;
    string name = 2;

    repeated Phone phone = 4;

    enum PhoneType {
        MOBILE = 0;
        HOME = 1;
        WORK = 2;
    }

    message Phone {
        string number = 1;
        PhoneType type = 2;
    }
}

使用下面命令編譯出.java文件

protoc --java_out=./java ./proto/message.proto 

編寫java文件測試

public class Main {
    public static void main(String[] args) {
        Message.Person.Builder personBuilder = Message.Person.newBuilder();
        personBuilder.setId(12345678);
        personBuilder.setName("Admin");
        personBuilder.addPhone(Message.Person.Phone.newBuilder().setNumber("10010").setType(Message.Person.PhoneType.MOBILE));
        personBuilder.addPhone(Message.Person.Phone.newBuilder().setNumber("10086").setType(Message.Person.PhoneType.HOME));
        personBuilder.addPhone(Message.Person.Phone.newBuilder().setNumber("10000").setType(Message.Person.PhoneType.WORK));

        Message.Person person = personBuilder.build();
        byte[] buff = person.toByteArray();

        try {
            Message.Person personOut = Message.Person.parseFrom(buff);
            System.out.printf("Id:%d, Name:%s\n", personOut.getId(), personOut.getName());

            List<Message.Person.Phone> phoneList = personOut.getPhoneList();

            for (Message.Person.Phone phone : phoneList) {
                System.out.printf("PhoneNumber:%s (%s)\n", phone.getNumber(), phone.getType());
            }

        } catch (InvalidProtocolBufferException e) {
            e.printStackTrace();
        }

        System.out.println(Arrays.toString(buff));

    }
}

運行結果

Id:12345678, Name:Admin
PhoneNumber:10010 (MOBILE)
PhoneNumber:10086 (HOME)
PhoneNumber:10000 (WORK)
[8, -50, -62, -15, 5, 18, 5, 65, 100, 109, 105, 110, 34, 7, 10, 5, 49, 48, 48, 49, 48, 34, 9, 10, 5, 49, 48, 48, 56, 54, 16, 1, 34, 9, 10, 5, 49, 48, 48, 48, 48, 16, 2]

Process finished with exit code 0

轉載請注明來源 www.cnblogs.com/zhangtingkuo/p/use-protobuf-in-java.html