java - Spring - Java Map HashMap to Multi-Layer Pojo

Question

我有一个散列图 Map<String, String>具有以下值，请注意点表示层次结构:

+--------------------+-----------+
|    Key             |  Value    |
+--------------------+-----------+
| car.color          | blue      |
| car.engine.make    | mitsubishi|
| car.engine.power   | 120       |
+--------------------+-----------+

我有 pojo 类:

public class Vehicle {

    private Car car;
   **Setters and Getters Below*  
}    

public class Car {
    private String color;

    private Engine engine;
    **Setters and Getters Below*      
}

public class Engine {
    private String make;

    private Integer power;
    **Setters and Getters Below**
}

有什么方法可以根据层次结构将 HashMap 映射到 POJO 类中？我试着用 jackson ObjectMapper mapper = new ObjectMapper();但它似乎能够映射 1 级对象。

Answer 1

如果你想用jackson将hashmap映射到POJO中，你必须重构结构:

{
  "car": {
    "color": "blue",
    "engine": {
      "make": "mitsubishi",
      "power": 20
    }
  }
}

或者，您可以解析 hashmap 并手动构建每个 class。