如何从json字符串获取文件“ cat2”的值

Question

How to Get value of filed cat2 from the json string ..........

The code I have used to get the json string is mentioned below...

Gson gson = new Gson()
//convert java object to JSON format
String json = gson.toJson(obj);
System.out.println(json);

....console output..........

{
"feed": [
    {
        "cat1": "test",
        "cat2": "test",
        "cat3": "test",
        "title": "test"
    }
],
"bigimage": 0
}

What should I do further to get the value inside the cat2 ie test ?

Answer 1

JsonParser parser =  new JsonParser();

JsonElement jsonElement = parser.parse(json);
JsonObject jsonObj = jsonElement.getAsJsonObject();

JsonArray feed = new JsonArray();
feed = jsonObj.getAsJsonArray("feed");

JsonObject jsonOb = feed.get(0).getAsJsonObject();
String value = jsonOb.get("cat2").getAsString();

This is how you can get value of cat2 . You will need to add com.google.gson library to compile this code.

Answer 2

Add the below code and try:

JsonParser parser =  new JsonParser();
JsonElement jsonElement = parser.parse(data);
JsonObject jsonObj = jsonElement.getAsJsonObject();
JsonArray feed = jsonObj.getAsJsonArray("feed");//get the feed arry from json
JsonObject jsonObject = feed.get(0).getAsJsonObject();//get the first feed element
System.out.println(jsonObject.get("cat2"));//displays test