检查收到的JSON在Java中是否有必要的值

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonValidator {
    public static void main(String[] args) {
        String jsonString = "{\"name\":\"John\",\"age\":30,\"email\":\"john@example.com\"}";

        ObjectMapper objectMapper = new ObjectMapper();
        try {
            // 将JSON字符串转换为Java对象
            Person person = objectMapper.readValue(jsonString, Person.class);

            // 检查必要的值
            if (person.getName() == null) {
                throw new IllegalArgumentException("Name is required.");
            }

            if (person.getAge() <= 0) {
                throw new IllegalArgumentException("Age is required and should be greater than 0.");
            }

            if (person.getEmail() == null || person.getEmail().isEmpty()) {
                throw new IllegalArgumentException("Email is required.");
            }

            System.out.println("JSON validation passed.");
        } catch (Exception e) {
            System.out.println("JSON validation failed: " + e.getMessage());
        }
    }
}

class Person {
    private String name;
    private int age;
    private String email;

    // 省略构造函数、getter和setter方法
}