Java tutorial
/* * Copyright (C) 2012 Krawler Information Systems Pvt Ltd * All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package com.krawler.esp.servlets; import com.krawler.utils.json.base.JSONException; import java.io.FileInputStream; import java.io.IOException; import java.io.PrintWriter; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.util.CellReference; import org.apache.poi.poifs.filesystem.POIFSFileSystem; import org.apache.poi.ss.usermodel.Cell; import com.krawler.utils.json.base.JSONArray; import com.krawler.utils.json.base.JSONObject; import java.io.FileNotFoundException; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import org.apache.poi.hssf.usermodel.HSSFDateUtil; /** * * @author krawler */ public class XLSDataExtractor extends HttpServlet { /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { JSONObject jobj = new JSONObject(); PrintWriter out = response.getWriter(); try { String filename = request.getParameter("filename"); int sheetNo = Integer.parseInt(request.getParameter("index")); jobj = parseXLS(filename, sheetNo); } catch (Exception e) { Logger.getLogger(XLSDataExtractor.class.getName()).log(Level.SEVERE, null, e); try { jobj.put("msg", e.getMessage()); jobj.put("lsuccess", false); jobj.put("valid", true); } catch (JSONException ex) { } } finally { out.println(jobj); } } public JSONObject parseXLS(String filename, int sheetNo) throws FileNotFoundException, IOException, JSONException { JSONObject jobj = new JSONObject(); POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(filename)); HSSFWorkbook wb = new HSSFWorkbook(fs); HSSFFormulaEvaluator evaluator = new HSSFFormulaEvaluator(wb); HSSFSheet sheet = wb.getSheetAt(sheetNo); int startRow = 0; int maxRow = sheet.getLastRowNum(); int maxCol = 0; int noOfRowsDisplayforSample = 20; if (noOfRowsDisplayforSample > sheet.getLastRowNum()) { noOfRowsDisplayforSample = sheet.getLastRowNum(); } JSONArray jArr = new JSONArray(); for (int i = 0; i <= noOfRowsDisplayforSample; i++) { Row row = sheet.getRow(i); JSONObject obj = new JSONObject(); JSONObject jtemp1 = new JSONObject(); if (row == null) { jArr.put(obj); continue; } if (maxCol < row.getLastCellNum()) maxCol = row.getLastCellNum(); for (int j = 0; j < row.getLastCellNum(); j++) { Cell cell = row.getCell(j); if (cell == null) continue; String colHeader = new CellReference(i, j).getCellRefParts()[2]; String val = null; switch (cell.getCellType()) { case Cell.CELL_TYPE_NUMERIC: val = Double.toString(cell.getNumericCellValue()); if (HSSFDateUtil.isCellDateFormatted(cell)) { java.util.Date df = HSSFDateUtil.getJavaDate(Double.parseDouble(val)); String df_full = "yyyy-MM-dd"; DateFormat sdf = new SimpleDateFormat(df_full); val = sdf.format(df); } break; case Cell.CELL_TYPE_STRING: val = cell.getRichStringCellValue().getString(); break; } if (i == 0) { // List of Headers (Consider first row as Headers) jtemp1 = new JSONObject(); jtemp1.put("header", val); jtemp1.put("index", j); jobj.append("Header", jtemp1); } obj.put(colHeader, val); } jArr.put(obj); } jobj.put("startrow", startRow); jobj.put("maxrow", maxRow); jobj.put("maxcol", maxCol); jobj.put("index", sheetNo); jobj.put("data", jArr); jobj.put("filename", filename); jobj.put("msg", "Image has been successfully uploaded"); jobj.put("lsuccess", true); jobj.put("valid", true); return jobj; } public JSONObject parseXLS1(String filename, int sheetNo) throws FileNotFoundException, IOException, JSONException { JSONObject jobj = new JSONObject(); POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(filename)); HSSFWorkbook wb = new HSSFWorkbook(fs); HSSFFormulaEvaluator evaluator = new HSSFFormulaEvaluator(wb); HSSFSheet sheet = wb.getSheetAt(sheetNo); ArrayList<String> arr = new ArrayList<String>(); int startRow = 0; int maxRow = sheet.getLastRowNum(); int maxCol = 0; JSONArray jArr = new JSONArray(); try { for (int i = 0; i <= sheet.getLastRowNum(); i++) { Row row = sheet.getRow(i); JSONObject obj = new JSONObject(); JSONObject jtemp1 = new JSONObject(); if (row == null) { jArr.put(obj); continue; } if (maxCol < row.getLastCellNum()) maxCol = row.getLastCellNum(); for (int j = 0; j < row.getLastCellNum(); j++) { Cell cell = row.getCell(j); String val = null; if (cell == null) { arr.add(val); continue; } ; String colHeader = new CellReference(i, j).getCellRefParts()[2]; switch (cell.getCellType()) { case Cell.CELL_TYPE_NUMERIC: val = Double.toString(cell.getNumericCellValue()); if (HSSFDateUtil.isCellDateFormatted(cell)) { java.util.Date df = HSSFDateUtil.getJavaDate(Double.parseDouble(val)); String df_full = "yyyy-MM-dd"; DateFormat sdf = new SimpleDateFormat(df_full); val = sdf.format(df); } break; case Cell.CELL_TYPE_STRING: val = cell.getRichStringCellValue().getString(); break; } if (i == 0) { // List of Headers (Consider first row as Headers) jtemp1 = new JSONObject(); jtemp1.put("header", val); jtemp1.put("index", j); jobj.append("Header", jtemp1); obj.put(colHeader, val); arr.add(val); } else { if (arr.get(j) != null) obj.put(arr.get(j), val); } } jArr.put(obj); } } catch (Exception ex) { Logger.getLogger(XLSDataExtractor.class.getName()).log(Level.SEVERE, null, ex); } jobj.put("startrow", startRow); jobj.put("maxrow", maxRow); jobj.put("maxcol", maxCol); jobj.put("index", sheetNo); jobj.put("data", jArr); jobj.put("filename", filename); jobj.put("msg", "Image has been successfully uploaded"); jobj.put("lsuccess", true); jobj.put("valid", true); return jobj; } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP <code>GET</code> method. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP <code>POST</code> method. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet. * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }