Want to use easy UI generated provinces of the nation's drop-down tree
For the tree drop-down required json format is more special, so I used a recursive implementation, as provinces in the country too much, need to spend seven or eight seconds at a time, do you have any good solution?
Or should not use recursion, the json string should be how to spell it?
Haven't graduate, very vegetables, hope you Daniel can speak a little bit in detail, thank you
The code

 public List GetCityTree () {
List TreeList=cityService. GetCityTreeNode (0); 
Return getChildrenNodeList (treeList); 
} 


/* * 
* recursive top-level node 
* @ param treeList 
* @ return 
*/
Private List GetChildrenNodeList (List TreeList) {
For (Map The map: treeList) {
The Object pid=map. Get (" id "); 
List ChildrenNodeList=cityService. GetCityTreeNode (Integer. ParseInt (String. The valueOf (pid))); 
if(! ChildrenNodeList. IsEmpty ()) {
GetChildrenNodeList (childrenNodeList); 
The map. The put (" state ", "closed"); 
The map. The put (" children ", childrenNodeList); 
} 
} 
Return treeList; 
}