使用动态键将Json字符串转换为Java对象

{
  "name": "John",
  "age": 30,
  "city": "New York"
}

public class Person {
  private String name;
  private int age;
  private String city;

  // 省略构造方法和getter/setter方法
}

import com.fasterxml.jackson.databind.ObjectMapper;

String json = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";

ObjectMapper objectMapper = new ObjectMapper();
Person person = objectMapper.readValue(json, Person.class);

import com.fasterxml.jackson.databind.ObjectMapper;

String json = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";

ObjectMapper objectMapper = new ObjectMapper();
Map<String, Object> map = objectMapper.readValue(json, new TypeReference<Map<String, Object>>() {});

String name = (String) map.get("name");
int age = (int) map.get("age");
String city = (String) map.get("city");