先理解這幅圖 簡單說[]中間的List，{}中間的是Map。[{},{}]就是List<

PrintWriter out;
            List<Permission> list = this.pService.queryHql();
            JSONObject obj =new JSONObject();
            obj.element("code", 0);
            obj.element("msg", "success");
            Map<String
 
, Object> mMap = new HashMap<String, Object>();

            List<Map<String, Object>> treeList = new ArrayList<Map<String,Object>>();
            for (int i = 0; i < list.size(); i++) {
                // 父節點
                Permission permission = list.get(i);
                if
 
 (permission.getPid() == null) {
                    Map<String, Object> pMap=new HashMap<String, Object>();
                    pMap.put("name", permission.getName());
                    pMap.put("value", permission.getId());
                    // 判斷ID，自動勾選
                    if (HcHelper.StringIsNotempty(choose)) {
                        //System.out.println(choose);
 

                        String[] split = choose.split(",");
                        for (int g = 0; g < split.length; g++) {
                            String id = split[g];
                            if (permission.getId() == Integer.parseInt(id)) {
                                pMap.put("checked", "true");
                            }
                        }
                    }
                    // 第一個子節點
                    List<Map<String, Object>> rList2 = new ArrayList<Map<String, Object>>();
                    for (int j = 0; j < list.size(); j++) {
                        Permission permission2 = list.get(j);
                        if (HcHelper.NumberIsNotempty(permission2.getPid())) {
                            if (permission2.getPid().equals(permission.getId())) {
                                Map<String, Object> p2Map = new HashMap<String, Object>();
                                p2Map.put("name", permission2.getName());
                                p2Map.put("value",permission2.getId());
                                // 判斷ID，自動勾選
                                if (HcHelper.StringIsNotempty(choose)) {
                                    //System.out.println(choose);
                                    String[] split = choose.split(",");
                                    for (int g = 0; g < split.length; g++) {
                                        String id = split[g];
                                        if (permission2.getId() == Integer.parseInt(id)) {
                                            p2Map.put("checked", "true");
                                        }
                                    }
                                }

                                //第二個子節點

                                List<Map<String, Object>> rList3 = new ArrayList<Map<String, Object>>();
                                for (int k = 0; k < list.size(); k++) {
                                    Permission permission3 = list.get(k);
                                    if (HcHelper.NumberIsNotempty(permission3.getPid())) {
                                        if (permission3.getPid().equals(permission2.getId())) {
                                            Map<String, Object> p3Map = new HashMap<String, Object>();
                                            p3Map.put("name", permission3.getName());
                                            p3Map.put("value",permission3.getId());
                                            // 判斷ID，自動勾選
                                            if (HcHelper.StringIsNotempty(choose)) {
                                                String[] split = choose.split(",");
                                                for (int g = 0; g < split.length; g++) {
                                                    String id = split[g];
                                                    if (permission3.getId() == Integer.parseInt(id)) {
                                                        p3Map.put("checked", "true");
                                                    }
                                                }
                                            }
                                            rList3.add(p3Map);
                                            p2Map.put("list", rList3);
                                            //System.out.println("第二子節點"+pMap2);
                                        }
                                    }
                                }
                                rList2.add(p2Map);
                                pMap.put("list", rList2);
                                //System.out.println("第1子節點"+pMap);
                            }
                        }
                    }

                    treeList.add(pMap);
                }
            }
            mMap.put("trees", treeList);
            obj.element("data",mMap);
            out = response.getWriter();
            out.print(obj.toString());
            out.close();

最後其實我還是不怎麼會寫這種樹形結構，如果有問題，可以留言給我。