字符串解析成easyui-tree的格式

传入的list:

[30 : null : null, 301503 : null : null, 301501 : null : null, 301502 : null : null, 3015 : null : null]

解析后的json:

 public class LeftTreeBean {
     public StringBuilder getTreeMenus(List lst, String contextPath) {
         StringBuilder model = new StringBuilder("");
         String RightName = "";
         String RightURL = "";

         Map rightMap = new HashMap();

 //        for (RightObject ro : (ArrayList) lst) {
         for (Object ro : lst) {
             ro = (RightObject)ro;
             String parentId = ((RightObject) ro).getParentID();

             if ((parentId == null) || (parentId.trim().length() == 0)
                     || (parentId.equalsIgnoreCase("0"))) {
                 parentId = "0";
             }
             if (!rightMap.containsKey(parentId)) {
                 rightMap.put(parentId, new ArrayList());
             }

             ((List) rightMap.get(parentId)).add(ro);
         }

         List lro = (List) rightMap.get("0");

         if (lro != null) {
             model.append("[");

             Map mt = ConfUtil.getMenus();

 //            for (RightObject ro : lro) {
             for (Object ro : lro) {
                 ro = (RightObject)ro;
                 RightName = (String) ((Map) mt.get(((RightObject) ro).getRightID()))
                         .get("RIGHTNAME");
                 RightURL = "";

                 model.append('{').append("key:")
                         .append(JSONUtilities.quote(((RightObject) ro).getRightID()))
                         .append(",title:")
                         .append(JSONUtilities.quote(RightName));

                 if (rightMap.containsKey(((RightObject) ro).getRightID())) {
                     model.append(",isFolder:true,children:[\n");

                     for (RightObject ro2 : (List) rightMap.get(ro.getRightID())) {
                         Map rItem = (Map) mt.get(ro2.getRightID());
                         if (rItem != null) {
                             RightName = (String) rItem.get("RIGHTNAME");

                             model.append("\t{")
                                     .append("key:")
                                     .append(JSONUtilities.quote(ro2
                                             .getRightID())).append(",title:")
                                     .append(JSONUtilities.quote(RightName));

                             if (rightMap.containsKey(ro2.getRightID())) {
                                 model.append(",isFolder:true,children:[\n");

                                 for (RightObject ro3 : (List) rightMap.get(ro2
                                         .getRightID())) {
                                     if (mt.containsKey(ro3.getRightID())) {
                                         RightName = (String) ((Map) mt.get(ro3
                                                 .getRightID()))
                                                 .get("RIGHTNAME");
                                         RightURL = (String) ((Map) mt.get(ro3
                                                 .getRightID())).get("URL");
                                         String BUSSFUNCID = ro3.getBussFuncID();

                                         String split = RightURL.indexOf("?") >= 0 ? "&"
                                                 : "?";
                                         String url = contextPath
                                                 + RightURL.replace('\\', '/')
                                                 + split + "RightID="
                                                 + ro3.getRightID()
                                                 + "&_menuID="
                                                 + ro3.getRightID() + "&funcID="
                                                 + BUSSFUNCID;

                                         model.append("\t\t{")
                                                 .append("key:")
                                                 .append(JSONUtilities.quote(ro3
                                                         .getRightID()))
                                                 .append(",title:")
                                                 .append(JSONUtilities
                                                         .quote(RightName))
                                                 .append(",url:")
                                                 .append(JSONUtilities
                                                         .quote(url))
                                                 .append("},\n");
                                     }
                                 }
                                 model.deleteCharAt(model.length() - 2).append(
                                         "\t\t]");
                             }
                             model.append("},\n");
                         }
                     }
                     model.deleteCharAt(model.length() - 2).append("\t]");
                 }
                 model.append("},\n");
             }

             model.deleteCharAt(model.length() - 2).append(']');
         }

         return model;
     }
 }