how to map nested values with Jackson to flatten out a complex data structure
时间: 2024-02-17 22:04:51 浏览: 28
To flatten out a complex data structure with nested values using Jackson, you can use the `@JsonUnwrapped` annotation. Here's an example:
Suppose you have a class `Person` with nested `Address` and `Contact` classes:
```
public class Person {
private String name;
private Address address;
private Contact contact;
// getters and setters
}
public class Address {
private String street;
private String city;
// getters and setters
}
public class Contact {
private String email;
private String phone;
// getters and setters
}
```
To flatten out the nested values, add the `@JsonUnwrapped` annotation to the nested classes in the `Person` class:
```
public class Person {
private String name;
@JsonUnwrapped
private Address address;
@JsonUnwrapped
private Contact contact;
// getters and setters
}
```
This will serialize the nested values as if they were part of the `Person` class, resulting in a flattened JSON structure.