Need help working with a json formatted string. (Java)

Question

I have the contents of this page stored in a string variable. I've spent hours looking at different ways of working with json in java, and have learned a lot about the build path, dependencies, ssl certificates, and so on. I say that to emphasize the fact that I have been looking for an answer to this question independently. I've finally caved and I need help.

I'm looking for a way to turn this string into some kind of json array so that I could access the individual elements more easily. For example, something along the lines of:

int map = jsonArray[index].getInt("map_Id");

I hope that what I'm trying to do is clear enough. Any help would be appreciated.

edit: I'm currently attempting this with gson but am open to suggestions.

Answer 1

You can use the Jackson libraries used for JSON parsing as follows:

public static int getIntFromJson(String jsonString)
{
    ObjectMapper mapper = new ObjectMapper();
    JsonNode node = mapper.readTree(jsonString);
    int id = node.get(0).get("age").asInt();   
    return id;      
}

Assuming that your jsonString will be something like this, the above code will return39.

[
  { "name": "Dagny Taggart", "age": 39 }, 
  { "name": "Francisco D'Anconia", "age": 40 }, 
  { "name": "Hank Rearden", "age": 46 }
]