如何检查键是否存在于Json Object中并获取其值 [英] How to check if a key exists in Json Object and get its value

问题描述

让我们说这是我的JSON Object

{
  "LabelData": {
    "slogan": "AWAKEN YOUR SENSES",
    "jobsearch": "JOB SEARCH",
    "contact": "CONTACT",
    "video": "ENCHANTING BEACHSCAPES",
    "createprofile": "CREATE PROFILE"
  }
}

我需要知道'video'是否存在于此对象中，如果存在，则需要获取此键的值.我尝试了以下操作，但是我无法获得此钥匙的价值.

I need to know that either 'video` exists or not in this Object, and if it exists i need to get the value of this key. I have tried following, but i am unable to get value of this key.

 containerObject= new JSONObject(container);
 if(containerObject.hasKey("video")){
  //get Value of video
}

推荐答案

使用以下代码查找键是否在JsonObject中存在. has("key")方法用于在JsonObject中查找键.

Use below code to find key is exist or not in JsonObject. has("key") method is used to find keys in JsonObject.

containerObject = new JSONObject(container);
//has method
if (containerObject.has("video")) {
    //get Value of video
    String video = containerObject.optString("video");
}

如果使用optString("key")方法获取String值，则不必担心JsonObject中是否存在键.

If you are using optString("key") method to get String value then don't worry about keys are existing or not in the JsonObject.

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