如何使用rest模板中的Json，并在Spring Boot中将每个元素映射到另一个Json

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

{
  "name": "John",
  "age": 30,
  "email": "john@example.com"
}

public class User {
    private String name;
    private int age;
    private String email;

    // 省略构造函数、getter和setter方法
}

RestTemplate restTemplate = new RestTemplate();
User user = restTemplate.getForObject("http://example.com/api/user", User.class);

public class TargetJson {
    private String name;
    private int age;
    private String email;

    // 省略构造函数、getter和setter方法
}

RestTemplate restTemplate = new RestTemplate();
User user = restTemplate.getForObject("http://example.com/api/user", User.class);

TargetJson targetJson = new TargetJson();
targetJson.setName(user.getName());
targetJson.setAge(user.getAge());
targetJson.setEmail(user.getEmail());

// 将targetJson转换为Json字符串
String targetJsonString = new ObjectMapper().writeValueAsString(targetJson);