Question

I am trying to trying to get a value out of a json object. How would I get a third level json object:

json format looks like:

feedString = {"level1":[{"level2":{"level3":{"valueIWant":10}}}]}

Code is:

JSONObject  jsonFeed = new JSONObject(feedString);
jsonFeed.get("level1.level2.level3.valueIWant");

Can I get nested levels in one get? What should my key look like?

Answer 1

You could give JSONiJ (JSON in Java) a shot; it’s a Java version of JSONPath and basically maps (a subset of) XPath syntax onto JSON objects.

Also, see this SO question for some other ideas; it looks like json-path has a Java version, and uses dot notation.

The other option is to build an EL bridge between JSONObjects and something like MVEL or OGNL, which would give you the more-familiar dot notation. (I thought there was an MVEL/JSON bridge, but can’t find it now.)