[java] jsp, json 웹페이지에 데이터 값 띄우기 2 - JSONArray / JSONObject 으로 배열 값 객체화

previous lesson > 2022.02.05 - [JAVA] - [java] jsp, json 웹페이지에 데이터 값 띄우기 1 - getWriter() / 헤더 코드 포함

 

< JSONArray / JSONObeject를 이용하여 값을 객체화 시시켜보자>

-  데이타 값을 JSONArray / JSONObeject와 for문을 통해 배열 값을 만들고 객체화한 뒤 출력해보자.

 

임의의 서블릿 값 : /json_selectAll.do

 

#Code

package test.com;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.JSONArray;
import org.json.JSONObject;

/**
 * Servlet implementation class TestController
 */
@WebServlet({"/json_selectAll.do"})
public class TestController extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public TestController() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setHeader("Content-Type", "application/json;charset=utf-8");
		response.setHeader("Access-Control-Allow-Headers", "Content-Type");
		response.setHeader("Access-Control-Allow-Origin", "*");
		
        	//모니터링 : 접속한 서블릿패스를 출력해줘
		String sPath = request.getServletPath(); 
		System.out.println(sPath);
		
		if(sPath.compareTo("/json_selectAll.do")==0) {
        
			JSONArray arr = new JSONArray();
			
			for (int i = 0; i < 3; i++) {
				TestVO vo = new TestVO();
				vo.setNum(1+i);
				vo.setName("lee"+(1+i));
				vo.setage(30+(1+i));
				
				arr.put(new JSONObject(vo));
			}
			response.getWriter().append(arr.toString());

		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		doGet(request, response);
	}

}

 

 

#결과값

1. 값이 java 배열 형태"{ , , , }"로 잘 출력된 것을 확인할 수 있다.