Question

Following this example.

GET response is:

{
“singer”:”Metallica”,
“title”:”Enter Sandman”
}

If more objects were included output should be like this:

[{
“singer”:”Metallica”,
“title”:”Enter Sandman”
}, {
“singer”:”Elvis”,
“title”:”Rock”
}]

I want to get the ‘classname’ written too. Something like this:

{“Track”:[ {
“singer”:”Metallica”,
“title”:”Enter Sandman”
}, {
“singer”:”Elvis”,
“title”:”Rock”
}]}

Any simple ways to achieve this?

Looking forward to get data directly into Datatables from a JAX-RS Resteasy (Jackson) Server. Also trying to avoid DTO.

Answer 1

class TrackList  
{  
   private List<Track> Track = new ArrayList<Track>();  
   // setter, getter  
}  

GET method

public TrackList getTrackInJSON() {  

EDIT
GET method

public String getTrackInJSON() {   
   // ... create list of objects  

   return convertToString(objects);  
}   

utility method

static <T> String convertToString(List<T> list) throws IOException
{
    final String json = new ObjectMapper().writeValueAsString(list);

    return new StringBuilder()
            .append("{\"")
            .append(list.get(0).getClass().getSimpleName())
            .append("\":")
            .append(json)
            .append("}")
            .toString();
}