$within进行空间查询--MongoDB API for Java

db=conn.getDB("testgps");
				DBCollection users=db.getCollection("ST_Layer_ST_Layer_gpslayer1");
				List<Double[]> polygon = new ArrayList<Double[]>();
				polygon.add(new Double[]{0.0,0.0});
				polygon.add(new Double[]
				{ 0.0, 25.2 });
				polygon.add(new Double[]
				{ 117.3, 25.2 });
				polygon.add(new Double[]
				{ 117.3, 0.0 });
				DBObject searchObj = new BasicDBObject("$within", new BasicDBObject("$polygon",polygon));
				DBObject output=new BasicDBObject("bound_box.coordinates",searchObj);
				
				DBCursor cursor=users.find(output);
				while(cursor.hasNext())
				{
					//DBObject Obj=(DBObject)cursor.next();
					//DBObject Obj1=Obj.get("start_time");
					//Date dt=(Date)Obj.get("start_time");
					
					System.out.println(cursor.next());
				}