java嵌套json转实体类

可以使用第三方库如Gson或Jackson来实现Java嵌套Json转实体类。

假设有如下的Json字符串：

{
  "id": 1,
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "state": "NY",
    "zip": "10001"
  }
}

可以定义一个Java类来代表这个Json对象：

public class Person {
    private int id;
    private String name;
    private int age;
    private Address address;
    
    // getters and setters
}

public class Address {
    private String street;
    private String city;
    private String state;
    private String zip;
    
    // getters and setters
}

然后使用Gson或Jackson进行转换：

Gson gson = new Gson();
Person person = gson.fromJson(jsonString, Person.class);

或者使用Jackson：

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

这样就可以将Json字符串转换为Java对象并嵌套转换为实体类。