Java Spring动态反序列化JSON可以是列表，也可以只是一个对象

发布于12月05日

我创建了反序列化的样例类和响应，但这是需要修复的同一个问题.响应可以是带对象的数组，也可以是just an Object. 需要动态反序列化

班级

public record  Main班级(
  //the response can either be array or not array
  @JsonProperty("Relation") List<Relation> relation
){

 
}


public record  Relation(
   String relation,
   String Id,
){

 
}

如果响应为数组Working，则反序列化

响应

{
 "Relation": [
          {
            "url": "https://sample.com",
            "Id": "77"
          }
        ]
        
}

当If响应不是数组时反序列化 This need to be fix个

响应

{
 "Relation":{
            "url": "https://sample.com",
            "Id": "77"
          }
        
        
}

推荐答案

另一种 Select 是为该属性提供两个设置器.

public class RelationWrapper
   private String id;
   private List<Relation> relation;

   public void setRelation(Relation relation) {
      this.relation = relation == null ? null : List.of(relation);
   }

   public void setRelation(List<Relation> relation) {
      this.relation = relation;
   }

   public List<Relation> getRelation() {
      return relation;
   }
}

这也可以用两个构造函数来完成

public class RelationWrapper
   private final String id;
   private final List<Relation> relation;

   @ConstructorProperties({"id", "relation"})
   public RelationWrapper(String id, List<Relation> relation) {
      this.id = id;
      this.relation = relation;
   }

   @ConstructorProperties({"id", "relation"})
   public RelationWrapper(String id, Relation relation) {
      this.id = id;
      this.relation = relation == null ? null : List.of(relation);
   }

   // getters
}