How to convert ArrayList<String> to JSON object using Jackson in Spring @ResponseBody

Question

Server layer will return a list of String value, like

{"Bob", "Charlotte", "Johnson", "David"...}

Now we need the List String to be a Json object to push to front end, like

[{id: "Bob"}, {id: "Charlotte"}, {id: "Johnson"}, {id: "David"...}]

or

[{name: "Bob"}, {name: "Charlotte"}, {name: "Johnson"}, {name: "David"...}]

Any label is fine, we just need a label to make it as JSON object. Does Jackson has something to convert List of String by default i.e. {string: "Bob"}? That will be really sweet......

Solution 1

The easiest thing to is to make your controller method return a structure that maps exactly to the JSON you want - for example a List<SomeObject> where SomeObject is a class with a String id field.

Solution 2

Th way of doing this is converting you List of String into a New Map.

Code :

@ResponseBody
@RequestMapping("/mapping")
function mySpring()
{


            List<String> myStringList;
            Map<String,String> jsonMap= new LinkedHashMap<String,String>(); 
     // Use LinkedHashMap if you want to maintain order


    String key="id";        
     // Id or Name

            for (String myString: myStringList)
        {
        jsonMap.put(key,myString);

        }

return jsonMap;

}

Comments

[Dreamer]

Thank you. Like you said I made an inner class with only one String field to hold the value, then made a list of this class object. Now it can be identified from front end.