Convert a string list/set to json objects in java

Question

I have a class named Order which contains one string list below

Set<String> items;

and when I convert this to JSON:

ObjectMapper mapperObj = new ObjectMapper();
String JSON = mapperObj.writeValueAsString(order);
System.out.println(JSON);

... I get output like below

"items":[  
         "xyz",
         "aaa"
        ]

I'm looking for an output something like below

"items":[  
         {  
            "result":"xyz"
         },
         {  
            "result":"aaa"
         }
        ]

I don't want to create a class separately for a single string.

You can format code easily by indenting with four spaces, that's all you need to do. — tadman
– tadman, Commented Sep 23, 2017 at 23:08
Could you please post the entire implementation of the Order class and its serialization/deserialization? — Sergey Vyacheslavovich Brunov
– Sergey Vyacheslavovich Brunov, Commented Sep 23, 2017 at 23:46
@SergeyBrunov it is a plan POJO object and i'm converting my class to JSON by using the below code.ObjectMapper mapperObj = new ObjectMapper(); String JSON = mapperObj.writeValueAsString(order); System.out.println(JSON); — Naveen
– Naveen, Commented Sep 24, 2017 at 10:27

Sergey Vyacheslavovich Brunov · Accepted Answer · 2017-09-25 10:35:26Z

1

You can use some API, like Jackson, for creating JSON object and print it into string. First create a json ArrayNode for your items. Then for each string in your items, create an ObjectNode like this,

ObjectNode node = mapper.createObjectNode();
node.put("result", "xyz");

and add them to the ArrayNode. Finally you print the JSON object out.

edited Sep 25, 2017 at 10:35

Sergey Vyacheslavovich Brunov

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answered Sep 24, 2017 at 3:02

thegreatleaf

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2 Comments

Naveen Over a year ago

Thanks for your response. This helps.. Is there any annotations or some way I can tell Set<String> items to treat it as independent string object?

thegreatleaf Over a year ago

you can override the toString() method for your Order class by returning a string representation of your json object

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