为什么我的 GeoJson 输出与正确格式的输出不匹配？

如何解决为什么我的 GeoJson 输出与正确格式的输出不匹配？

我正在创建一个接收数据的类，并且应该使用正确的 GeoJson 格式填充一个字符串。

这是我的输出：

{
  "features": [
    {
      "feature": {
        "geometry": {
          "x": 100,"y": 100,"geometryType": "POINT","hasZ": false,"hasM": false
        },"properties": {
          "height": 100.0,"name": "1"
        }
      },"foreignMembers": {}
    },{
      "feature": {
        "geometry": {
          "x": 200,"y": 200,"name": "2"
        }
      },"foreignMembers": {}
    }
  ],"foreignMembers": {}
}

这就是我想要的：

 { 
  "type":"FeatureCollection","features":[ 
 { 
             "type":"Feature","geometry": { 
                 "type":"Point","coordinates":[ 
                    100.00,100.00 
                      ] 
                   },"properties": { 
                      "name": "1","height": "32.3000","id": "null" 
                   } 
                },{ 
             "type":"Feature","coordinates":[ 
                    200.00,200.00 
                      ] 
                   },"properties": { 
                      "name": "2","height": "100.0","id": "null" 
                   } 
                } 
             ] 
   }

这是我用来返回我的 GeoJson 文本的内容：

public class GeojsonUtil {
    static public String toJson(final Object pObject) {
        final GsonBuilder gb = new GsonBuilder();
        gb.setPrettyPrinting();
        //gb.serializeNulls();
        final Gson gson = gb.create();
        final String jsonText = gson.toJson(pObject);
        return jsonText;        
    }

}

这是接收数据并将其放入特征集合的主类

public class myClass{
        FeatureCollection fc = new FeatureCollection();
        
        for(int i = 0; i < p.size(); i ++) {
            Map<String,Object> properties = new HashMap<String,Object>();
            Feature feature = new Feature();
            Point geometry = new Point();
            pdto dto = p.get(i);
            Position position = new Position(dto.getLon(),dto.getLat());
            

            fc.addFeature(feature);
            geometry.setCoordinates(position);
            feature.setGeometry(geometry);
            feature.setProperties(properties);

            properties.put("name",dto.getName());
            properties.put("height",dto.getHeight());
            properties.put("id",dto.getId());

        }
        
        
        return GeojsonUtil.toJson(fc);
    }

为什么我的输出格式如此奇怪并且不遵守 GeoJson 指南？所有数据都在那里，但输出不是有效的 GeoJson 格式。