convert java List to json array String

Import Package : json-simple

DOCS: https://code.google.com/archive/p/json-simple/

Download: https://code.google.com/archive/p/json-simple/downloads

 

public static void main(String[] args) {
		// Object Array List (For DB Data)
		DAO dao = DAO.sharedInstance();
		ArrayList<DTO> list;
		try {
        	//dao.select() return is ArrayList<DTO> 
			list = dao.select();
			//Json Array
			JSONObject jsonObject = new JSONObject();
			JSONArray jsonList = new JSONArray();
			
			for(DTO item: list) {
            	//"Column Name", "Value"
				jsonObject.put("content", item.getContent());
				jsonList.add(jsonObject);
			}
			
			System.out.println(jsonList.toString());
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		

	}

 

 

Ref:

https://aljjabaegi.tistory.com/40

https://stackoverflow.com/questions/17359830/conversion-of-array-list-to-json-object-stringhttps://shlee0882.tistory.com/45

https://tychejin.tistory.com/139

https://stackoverflow.com/questions/4112686/how-should-i-use-servlets-and-ajax

https://stackoverflow.com/questions/2010990/how-do-you-return-a-json-object-from-a-java-servlet

https://ellen92.tistory.com/33?category=733896