如何使用对象映射器在java中从简单对象映射到协议缓冲区对象

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.7</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.3</version>
</dependency>

public class SimpleObject {
    private String name;
    private int age;

    // 省略构造函数、getter和setter方法
}

import com.google.gson.Gson;

public class Main {
    public static void main(String[] args) {
        SimpleObject simpleObject = new SimpleObject();
        simpleObject.setName("John");
        simpleObject.setAge(25);

        Gson gson = new Gson();
        String json = gson.toJson(simpleObject);

        // 将json字符串转换为协议缓冲区对象的代码
    }
}

import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
    public static void main(String[] args) {
        SimpleObject simpleObject = new SimpleObject();
        simpleObject.setName("John");
        simpleObject.setAge(25);

        ObjectMapper objectMapper = new ObjectMapper();
        String json = objectMapper.writeValueAsString(simpleObject);

        // 将json字符串转换为协议缓冲区对象的代码
    }
}

SimpleObject simpleObject = gson.fromJson(json, SimpleObject.class);

SimpleObject simpleObject = objectMapper.readValue(json, SimpleObject.class);