JSONObject["featured_image"]不是字符串

Question

大家好，我从Wordpress rest APi调用中得到了下面的json。

   [
        {
            "ID": 248,
            "post_title": "test post",
            "post_author": "admin",
            "excerpt": "",
            "url": "http://localhost/wp-learning/?p=248",
            "permalink": "http://192.168.10.31/wp-learning/test-post/",
            "post_date": "2017-08-07 09:15:57",
            "comment_count": "2",
            "category": [
                {
                    "term_id": 1,
                    "name": "Uncategorized",
                    "slug": "uncategorized",
                    "term_group": 0,
                    "term_taxonomy_id": 1,
                    "taxonomy": "category",
                    "description": "",
                    "parent": 0,
                    "count": 1,
                    "filter": "raw",
                    "cat_ID": 1,
                    "category_count": 1,
                    "category_description": "",
                    "cat_name": "Uncategorized",
                    "category_nicename": "uncategorized",
                    "category_parent": 0
                }
            ],
            "views": "4",
            "featured_image": false
        },
        {
            "ID": 247,
            "post_title": "The Coolest Vanity Apps for You and Your Girls",
            "post_author": "admin",
            "excerpt": "",
            "url": "http://td_uid_79_598817d2cebf2",
            "permalink": "http://192.168.10.31/wp-learning/the-coolest-vanity-apps-for-you-and-your-girls/",
            "post_date": "2017-08-07 07:33:38",
            "comment_count": "0",
            "category": [
                {
                    "term_id": 15,
                    "name": "Beauty",
                    "slug": "beauty",
                    "term_group": 0,
                    "term_taxonomy_id": 15,
                    "taxonomy": "category",
                    "description": "On each category you can set a Category template style, a Top post style (grids) and a module type for article listing.",
                    "parent": 14,
                    "count": 17,
                    "filter": "raw",
                    "cat_ID": 15,
                    "category_count": 17,
                    "category_description": "On each category you can set a Category template style, a Top post style (grids) and a module type for article listing.",
                    "cat_name": "Beauty",
                    "category_nicename": "beauty",
                    "category_parent": 14
                }
            ],
            "views": "0",
            "featured_image": "http://192.168.10.31/wp-learning/wp-content/uploads/2017/08/3.jpg"
        }
]

我在获取标记名"featured_image“时遇到问题。它是什么类型的数据类型？我试过了

jsonObj.getString("featured_image"); 

为此，它给了我错误JSONObject"featured_image“不是一个字符串。也是

resultsObj.getJSONObject("featured_image").toString()

为此，它给了我错误JSONObject"featured_image“不是一个JSONObject。

Answer 1

您正在执行resultsObj.getJSONObject("featured_image").toString()，它要求从'featured_image‘处的键/值中获取一个JSON对象。

但是我们可以看到这个值是一个字符串，或者是一个布尔值：

"featured_image": "http://192.168.10.31/wp-learning/wp-content/uploads/2017/08/3.jpg"

"featured_image": false

所以你根本不应该在这个键上调用getJSONObject()。

Answer 2

根据您的JSON结构，看起来"featured_image“是布尔型的，而不是字符串或对象。

Answer 3

我认为它内部的json问题可以这样尝试：

JSONObject category = jsonObj.getJSONObject("category");

category.getJSONObject("featured_image");