java之protobuf初体验

定义proto文件

syntax = "proto3";
//输出的java文件包名
option java_package = "com.example.domain";
// 输出的java文件名
option java_outer_classname = "Pb";

message Person {
  string name = 1;
  int32 age = 2;
  string address = 3;
}

编译

protoc--java_out=. .\student.proto

引入依赖

        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>3.25.0</version>
        </dependency>

        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java-util</artifactId>
            <version>3.25.0</version>
        </dependency>

        <dependency>
            <groupId>com.googlecode.protobuf-java-format</groupId>
            <artifactId>protobuf-java-format</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>2.0.36</version>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>19.0</version>
        </dependency>

序列化与反序列化：

 @Test
    public void test3(){

        Pb.Person.Builder p1 = Pb.Person.newBuilder();
        p1.setAddress("北京")
                .setAge(23)
                .setName("zhang san").build();
        System.out.println(p1.toString());
        //序列化
        Pb.Person build = p1.build();
        //转换成字节数组
        byte[] s = build.toByteArray();
        System.out.println("protobuf数据bytes[]:" + Arrays.toString(s));
        System.out.println("protobuf序列化大小: " + s.length);

        try {
            Pb.Person person = Pb.Person.parseFrom(s);

            String jsonStr = JSONObject.toJSONString(person);
            System.out.println("Json格式化结果:\n" + jsonStr);
            System.out.println("Json格式化数据大小: " + jsonStr.getBytes().length);
        } catch (InvalidProtocolBufferException e) {
            throw new RuntimeException(e);
        }
    }

结果如下

name: "zhang san"
age: 23
address: "\345\214\227\344\272\254"

protobuf数据bytes[]:[10, 9, 122, 104, 97, 110, 103, 32, 115, 97, 110, 16, 23, 26, 6, -27, -116, -105, -28, -70, -84]
protobuf序列化大小: 21
Json格式化结果:
{"address":"北京","age":23,"name":"zhang san"}
Json格式化数据大小: 48

参考连接： https://blog.csdn.net/wxw1997a/article/details/116755542