String Object to Json in java

Question

I have a Strig variable. String name = "xyz"; I want to convert it to json object {"name": "xyz"}

I am currently doing it by putting the name in the map and converting map to json.

Map<String, String > map = new HashMap<>();
map.put("name", name);
new Gson().toJson(map);;

Is there better way to do it?

Answer 1

You can use ObjectMapper from com.fasterxml.jackson as

  public static String getString(Object object) {
        try {
            //Object to JSON in String
            return objectMapper.writeValueAsString(object);
        } catch (IOException e) {
            log.error("Exception ", e);
            return "";
        }
    }

Answer 2

You should create an Class Name . So it will automatically create mapping for you:

Sample Code:

public static void main(String[] args) {

    Name name = new Name();
    name.setName("xyz");
    System.out.println(new Gson().toJson(name));
  }

Output: {"name":"xyz"}

Name Class:

public class Name {

  private String name;

  /**
   * @return the name
   */
  public String getName() {
    return name;
  }

  /**
   * @param name
   *          the name to set
   */
  public void setName(String name) {
    this.name = name;
  }

}

Answer 3

If you have a JSON object of any complexity, you should create a POJO to hold it for you as suggested by @notescrew. If this is a one-off (for example, in some Web controllers that return basic status information) and you are on at least Java 9, you can simplify it by using an inline map:

gson.toJson(Map.of("name", name));

Note that most frameworks (client and server) will take care of serializing to JSON for you, so in most cases you can simply pass or return the Map directly.