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:[
");

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

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

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

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

        return model;
    }
}