尝试从 JSONObject 中获取 JSONArray 失败

Question

我正在使用 Spark 在 Java 中编写 API（与我的问题无关，但提供了一些上下文）。 我有以下 JSON（与我的后端返回的完全相同）：

{"CfgCampaign":{"callingLists":{"CfgCallingListInfo":{"callingListDBID":{"value":126},"share":{"value":10},"isActive":{"value":2}}},"xmlns":"http://schemas.genesyslab.com/Protocols/Configuration/ConfServer/2005/","DBID":{"value":101},"name":{"value":"WI_Camp_1"},"state":{"value":1},"campaignGroups":{"CfgCampaignGroupInfo":[{"groupType":{"value":5},"dialerDBID":{"value":0},"optMethodValue":{"value":80},"origDNDBID":{"value":0},"numOfChannels":{"value":10},"groupDBID":{"value":826},"isActive":{"value":2},"scriptDBID":{"value":0},"trunkGroupDNDBID":{"value":0},"operationMode":{"value":1},"dialMode":{"value":2},"statServerDBID":{"value":176},"optRecBuffSize":{"value":6},"optMethod":{"value":1},"minRecBuffSize":{"value":4}},{"groupType":{"value":5},"dialerDBID":{"value":0},"optMethodValue":{"value":80},"origDNDBID":{"value":0},"numOfChannels":{"value":10},"groupDBID":{"value":827},"isActive":{"value":2},"scriptDBID":{"value":0},"trunkGroupDNDBID":{"value":0},"operationMode":{"value":1},"dialMode":{"value":2},"statServerDBID":{"value":176},"optRecBuffSize":{"value":6},"optMethod":{"value":1},"minRecBuffSize":{"value":4}}]},"scriptDBID":{"value":0},"tenantDBID":{"value":101}}}

这似乎是有效的，根据https://jsonlint.com/ 我将它作为 JSONObject 存储在我的代码中（所以基本上，上面是 toString() 的结果）。 但是，当我尝试在 JSONArray 中提取“campaignGroups”时，我得到：

org.json.JSONException: JSONObject["campaignGroups"] not found.

我实际上得到了这个错误，即使只是试图获取任何密钥，例如调用 get("DBID") 将返回相同的错误。

我对这里发生的事情有点困惑，如果有任何帮助，我们将不胜感激。

编辑：因为只有从异常中才能明显看出，所以我使用的是 json.org

谢谢！

Answer 1

我相信您遇到的错误是由于包含其余数据的外部 JSON 对象“CfgCampaign”造成的。下面显示了一些关于如何使用 org.json 库解决此问题的示例代码：

// Loads the JSON (assuming you provide it as a string).
JSONObject x = new JSONObject(...);
// Gets and stores a reference to the outer object.
JSONObject y = x.getJSONObject("CfgCampaign");
// Now you can access any of the nested fields as follows.
JSONObject z = y.getJSONObject("campaignGroups");

Answer 2

在该对象上调用 toString() 应该返回一个类似于“[Object Object]”的字符串，如果必须在其上调用 toString 方法，那么您还需要调用 JSON.parse(your_object_here)在它上面访问属性。

此外，您似乎需要查找 your_object_name.CfgCampaign.campaignGroups 或 your_object_name["CfgCampaign"]["campaignGroups"，但如果没有您用于访问campaignGroups 的代码，就很难分辨。

如果你设置类似

const obj = {"CfgCampaign":{"callingLists":{"CfgCallingListInfo":{"callingListDBID":{"value":126},"share":{"value":10},"isActive":{"value":2}}},"xmlns":"http://schemas.genesyslab.com/Protocols/Configuration/ConfServer/2005/","DBID":{"value":101},"name":{"value":"WI_Camp_1"},"state":{"value":1},"campaignGroups":{"CfgCampaignGroupInfo":[{"groupType":{"value":5},"dialerDBID":{"value":0},"optMethodValue":{"value":80},"origDNDBID":{"value":0},"numOfChannels":{"value":10},"groupDBID":{"value":826},"isActive":{"value":2},"scriptDBID":{"value":0},"trunkGroupDNDBID":{"value":0},"operationMode":{"value":1},"dialMode":{"value":2},"statServerDBID":{"value":176},"optRecBuffSize":{"value":6},"optMethod":{"value":1},"minRecBuffSize":{"value":4}},{"groupType":{"value":5},"dialerDBID":{"value":0},"optMethodValue":{"value":80},"origDNDBID":{"value":0},"numOfChannels":{"value":10},"groupDBID":{"value":827},"isActive":{"value":2},"scriptDBID":{"value":0},"trunkGroupDNDBID":{"value":0},"operationMode":{"value":1},"dialMode":{"value":2},"statServerDBID":{"value":176},"optRecBuffSize":{"value":6},"optMethod":{"value":1},"minRecBuffSize":{"value":4}}]},"scriptDBID":{"value":0},"tenantDBID":{"value":101}}}

然后要在campaignGroups 中获取数组，您需要如下所示：

obj.CfgCampaign.campaignGroups