ReadJSONFile1

package com.sample;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
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;

@WebServlet("/ReadJSONFile1")
public class ReadJSONFile1 extends HttpServlet {
    private static final long serialVersionUID = 1L;

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
//      response.getWriter().append("Served at: ").append(request.getContextPath());
        processRequest(request, response);
    }// end of doPost method

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
//      doGet(request, response);
        processRequest(request, response);
    }// end of doPost method

    private void processRequest(HttpServletRequest request, HttpServletResponse response) throws IOException {
        /* Setting the Encoding of Input Data */
        request.setCharacterEncoding("UTF-8");

        /* Setting the encoding of the output data to the web page */
        response.setContentType("text/html; charset=UTF-8");

//      @SuppressWarnings("unused")
//      PrintWriter out = response.getWriter();

        FileInputStream fileInputStream = null;
        InputStreamReader inputStreamReader = null;
        BufferedReader bufferedReader = null;
        try {

            String input = "";
            String filePath = "/resources/productsData.json";
            ServletContext servletContext = request.getServletContext();
            String realFilePath = servletContext.getRealPath(filePath);

            fileInputStream = new FileInputStream(realFilePath);
            inputStreamReader = new InputStreamReader(fileInputStream, "UTF-8");// 用UTF-8編碼格式讀檔案
            bufferedReader = new BufferedReader(inputStreamReader);
            StringBuilder stringBuilder = new StringBuilder();
            while ((input = bufferedReader.readLine()) != null) {
                stringBuilder.append(input);
            }
            String output = stringBuilder.toString();
            JSONObject json = new JSONObject(output);
            JSONArray jsonArray = json.getJSONArray("products");
            List<Map<String, Object>> resultList = new ArrayList<Map<String, Object>>();
            Map<String, Object> item = null;
            for (int i = 0; i < jsonArray.length(); i++) {
                // 取得jsonArray的物件轉成JSONObject
                JSONObject jsonItem = jsonArray.getJSONObject(i);

                // 將jsonItem內的name和type塞到Map中
                item = new HashMap<String, Object>();
                item.put("title", jsonItem.getString("title"));
                item.put("price", jsonItem.getInt("price"));
                resultList.add(item);// 將item存入List
                item = null;
            } // end of for-loop
                // resultList
            request.setAttribute("resultList", resultList);

            RequestDispatcher requestDispatcher = request.getRequestDispatcher("/showProduct.jsp");
            requestDispatcher.forward(request, response);
        } catch (UnsupportedEncodingException e) {
            System.out.println("#1");
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            System.out.println("#2");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("#3");
            e.printStackTrace();
        } catch (ServletException e) {
            System.out.println("#4");
            e.printStackTrace();
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                    bufferedReader = null;
                } catch (IOException e) {
                    System.out.println("#5");
                    e.printStackTrace();
                }
            }
            if (inputStreamReader != null) {
                try {
                    inputStreamReader.close();
                    inputStreamReader = null;
                } catch (IOException e) {
                    System.out.println("#6");
                    e.printStackTrace();
                }
            }
            if (fileInputStream != null) {
                try {
                    fileInputStream.close();
                    fileInputStream = null;
                } catch (IOException e) {
                    System.out.println("#7");
                    e.printStackTrace();
                }
            }
        } // end of finally
    }// end of processRequest method

}// end of ReadJSONFile1 Servlet class