使用Jackson将复杂的JSON转换为一级POJO

Question

Let's imagine you have the following JSON:

{
  "prop0": "value0",
  "level1" : {
      "prop1": "value1"
      "prop2": "value2"
   },
   ....
}

Can it be turned to simple Java object?

class Pojo {
  private String prop0;
  private String prop1;
  private String prop2;
}

I don't want to create a intermediate class to wrap "level1".

What is come to my mind is to map my class in this way:

class Pojo {
  private String prop0;
  @JsonProperty("level1.prop1")
  private String prop1;
  @JsonProperty("level1.prop2")
  private String prop2;
}

But unfortunately it doesn't work. The inverse problem - turn complex Java object to plain JSON can be simply solved using @JsonUnwrapped annotation.

Can you please suggest any workable solution for my issue?

Answer 1

You need to either write a custom deserializer, or add a setter that can transform the structure. For latter you could do something like

...
public void setLevel1(Map<String,String> values) { // or JsonNode
   prop1 = values.get("prop1");
   // and so forth; if names are regular, can use looping
}