Android JSON解析（Jackson）

Question

I've read a bunch of different articles, comparations and tutorials that are using different JSON-Libraries for parsing (and creating) JSON into Java Objects. Anyway I think that I've got the facts right cause I've decided to use the JSON library called Jackson.

GSON is simple and robust but way to slow acording to me. So I decided to actually try this Jackson thing out but, it seems like the parsing is a little bit more confusing here than with GSON.

The data-type of the value that I want to parse is simply an Boolean .

This is what the JSON that I'm trying to parse looks like:

{"FooResult":true}

So what I actually need help with is selecting the value from the key FooResult and then parse its value into an Boolean.

This Is what I've done so far:

String json = getString(request);
ObjectMapper mapper = new ObjectMapper();
mapper.readValue(json, Boolean.class);

But this code obviously gives me an error cause I haven't selected that it is the FooResult key that I'm interested in reading & parsing into an Boolean.

Answer 1

You should create a new class like this:

class MyClass {
   public boolean FooResult;
}

And use this code to load the data:

MyClass myObject = mapper.readValue(json, MyClass.class);

Then you can access the value with myObject.FooResult

Answer 2

Ok this is lame. Even lamer when I rethink about it. The problem the whole time have been that the class of the object that you want to parse needs to be static . I've tried what Simon suggested like four or five times before I even posted this question today but the problem all time was that the class wasn't static .

So now it finally works.

static class FooClass
{  
    public boolean FooResult; 
}

And for the parsing process.

String json = getString(request);
ObjectMapper mapper = new ObjectMapper();
FooClass fooClass = null;
try 
{
    fooClass = mapper.readValue(json, FooClass.class);
}
boolean result = fooClass.FooResult;