postMan passes String and class entity JSON type

Among the classes:

public class AddTrainplanUserParam implements Serializable {
    private  TrainplanDto trainplanDto;
    private  UserBaseDto userbaseDto;

 postMan call method:

The following JSON is obtained via: JSONObject.toJSONString(class): 

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Origin blog.csdn.net/Ciel_Y/article/details/123786885