deserializing json with arrays

Question

im using jackson to deserialize some Json. I am reading through a large json document and pulling out blocks and telling jackson to take that block and deserialize it to an object that I created (Actually several objects as there are nested arrays) in java to match the json.

The code im using to deserialize is

fooObject newFoo = mapper.readValue(newNode,fooObject.class);

The problem is there is a value in the block that is sometimes a hash such as

addWidgetStrategy={"get":2,"spend":6,"textLabel":"bikes"}

and sometimes an array

addWidgetStrategy=[{"get":1.5,"spend":3,"textLabel":"thursday"},{"get":3,"spend":5,"textLabel":"tuesday"}]

So in fooObject I need to deal with addWidgetStrategy which has its own object. If in fooObject I put

public addWidgetStrategy addWidgetStrategy;

The above works until it tried to deserialize an array

If I put

public List<addWidgetStrategy>  addWidgetStrategy;

it works just for arrays and blows up when its just a single hash

How can I parse that same Json element addWidgetStrategy regardless if its an array or a single hash?

Eugene Retunsky · Accepted Answer · 2012-04-11 21:22:50Z

2

For arrays it should be:

   fooObject[] newFoo = mapper.readValue(newNode,fooObject[].class);

You can read it like this:

   JsonNode jsonNode = mapper.readTree(json);
   if (jsonNode.isArray()) {
       fooObject[] newFoo = mapper.readValue(jsonNode,fooObject[].class);
       ...
   } else {
       fooObject newFoo = mapper.readValue(jsonNode,fooObject.class);  
       ....
   }

answered Apr 11, 2012 at 21:22

Eugene Retunsky

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