如何调用Jackson中自定义反序列化器中的默认反序列化器？

Question

I have a JSON object that has 3 different objects in use.

{ // Class A
"name" : "Name",
"list" : { 
    "names" : { //Class B
        "scale1" : { //Class C
            "max" : 10,
            "min" : 0
        },
        "scale2" : { //Class C
            "max" : 20,
            "min" : 15
        }
    }
} }

Class A contains a Map< String,Class B>, and Class B contains a Map< String,Class C>. The issue I am having is that I have a custom deserializer for class B but I want to use the default deserializer for class C.

I want to have it something like this:

public class BDeserializer extends JsonDeserializer<B> {
@Override
public B deserialize(JsonParser arg0, DeserializationContext arg1)
        throws IOException, JsonProcessingException {
    B bObject = new B();
    while(!arg0.isClosed()){            
        C cObject = CDeserializer.deserialize()
        bObject.names.add(cObject);     
    }
    return bObject;
} }

But I am not sure what arguments to pass into the CDeserializer, or if there is a away for me to call a default deserializer for class C.

The classes look roughly like:

public class A {
String name;
Map<String,B> list = new HashMap<String,B>();

//getters & setters

}
public class B {
String name;
Map<String,C> fields = new HashMap<String,C>();

//getters & setters

}

public class C {
String name;
long min;
long max;

//getters & setters

}

Answer 1

You can use JsonParser object to read all properties. See below example:

class BJsonDeserializer extends JsonDeserializer<B> {

    @Override
    public B deserialize(JsonParser parser, DeserializationContext context) throws IOException, JsonProcessingException {
        B result = new B();
        result.setFields(new HashMap<String, C>());

        while (parser.nextToken() != JsonToken.END_OBJECT) {
            String name = parser.getCurrentName();
            if ("scale1".equals(name) || "scale2".equals(name) || "anotherProperty".equals(name)) {
                parser.nextToken();
                result.getFields().put(name, parser.readValueAs(C.class));
            }
        }
        return result;
    }
}

• Jackson JSON Processing API in Java Example Tutorial .