如何將json數據轉換為嵌套的json數據格式？

Question

[{"roleId":1,"roleName":"system Admin","createUser":"1","createActive":"N"},{"roleId":2,"roleName":"admin","createUser":"1","createActive":"Y"},{"roleId":3,"roleName":"system Admin","createUser":"1","createActive":"Y"}]

這是我在Spring中使用list編寫的輸出，但是我希望它以嵌套的json格式顯示，例如樹形結構（類似於下面的結構）。

 [{ "id": 1, "data": "Category", "attr": { "id": "1", "selected": false }, "children":
                    [
                        { "id": 2, "data": "SubCategory1", "attr": { "id": "2", "selected": false }, "children":
                                [{ "id": 4, "data": "Item1", "attr": { "id": "4", "selected": false }, "children": [] },
                                 { "id": 5, "data": "Item2", "attr": { "id": "5", "selected": false }, "children": [] },
                                 { "id": 6, "data": "Item3", "attr": { "id": "6", "selected": false }, "children": [] }
                                ]
                        },

                        { "id": 3, "data": "SubCategory2", "attr": { "id": "3", "selected": false }, "children":
                                 [{ "id": 7, "data": "Item4", "attr": { "id": "7", "selected": false }, "children": [] },
                                  { "id": 8, "data": "Item5", "attr": { "id": "8", "selected": false }, "children": [] },
                                  { "id": 9, "data": "Item6", "attr": { "id": "9", "selected": false }, "children": [] }
                                 ]
                        }
                    ]
    }];

我的代碼是

    @GET
    @Path("/findall")
    public List<UserRole> getAll() {

         return userroleservice.findAll();
    }

Answer 1

在一些像Gson這樣的Json解析器中使用漂亮的打印

Gson gson = new GsonBuilder().setPrettyPrinting().create();
String json = gson.toJson(obj);
System.out.println(json);

如果在網頁中，請使用javascript或jQuery格式插件

var str = JSON.stringify(obj, null, 4);