Java读写Excel文件DEMO

　　@RequestMapping("/xxxx/xxxx/xxxx/copyfiledownload")
    @ResponseBody
    public void copyfiledownload(HttpServletRequest request, HttpServletResponse response, Model model) throws Exception{
        response.setContentType("text/html; charset=GBK");
        String basePath = request.getSession().getServletContext().getRealPath("/");
        File file = new File(basePath + "xxxx.xls");
        FileOutputStream fos=new FileOutputStream(file);  
        HSSFWorkbook wb=new HSSFWorkbook();
        HSSFSheet sheet=wb.createSheet();
        wb.setSheetName(0, "sheet0");
        HSSFRow row=null;
        HSSFCell cell=null;
        row=sheet.createRow(0);
        cell=row.createCell(0);
        cell.setCellValue("xxID");
        cell=row.createCell(1);
        cell.setCellValue("每ID的总限量");
        cell=row.createCell(2);
        cell.setCellValue("每用户对此ID最大购买量");
        cell=row.createCell(3);
        cell.setCellValue("xx售卖价格");
        
        cell=row.createCell(4);
        cell.setCellValue("S时间");
        cell=row.createCell(5);
        cell.setCellValue("X时间");
        
        CellStyle cellStyle = wb.createCellStyle();
        CreationHelper helperDate = wb.getCreationHelper();
        cellStyle.setDataFormat(helperDate.createDataFormat().getFormat("yy/mm/dd/ hh:mm:ss"));
        HSSFRow rowD=null;
        HSSFCell cellD=null;
        for (int i = 1; i < 1000; i++) {
            rowD=sheet.createRow(i);
            cellD=rowD.createCell(4);
            cellD.setCellStyle(cellStyle);
            cellD=rowD.createCell(5);
            cellD.setCellStyle(cellStyle);
        } // 设置时间格式
        
        cell=row.createCell(6);
        cell.setCellValue("xx平台");
        //CellRangeAddressList(firstRow, lastRow, firstCol, lastCol)设置行列范围  
        CellRangeAddressList addressList = new CellRangeAddressList(1, 1000, 6, 6);  
        String[] pos = {"PC","WAP","APP","PC+WAP","PC+APP","WAP+APP","PC+WAP+APP"};
        DataValidationHelper helper = sheet.getDataValidationHelper();
        DataValidationConstraint constraint = helper.createExplicitListConstraint(pos);
        DataValidation dataValidation = helper.createValidation(constraint, addressList);
        if(dataValidation instanceof XSSFDataValidation) {
            dataValidation.setSuppressDropDownArrow(true);
            dataValidation.setShowErrorBox(true);
        }else {
            dataValidation.setSuppressDropDownArrow(false);
        }
        sheet.addValidationData(dataValidation);
        wb.write(fos);
        fos.close();
        response.setContentType("application/x-msdownload");
        response.setContentLength((int) file.length());
        response.setHeader("Content-Disposition", "attachment;filename=" + new String(file.getName().getBytes("gbk"), "iso-8859-1"));
        FileInputStream fis = new FileInputStream(file);
        BufferedInputStream buff = new BufferedInputStream(fis);
        byte[] b = new byte[1024];
        long k = 0;
        OutputStream myout = response.getOutputStream();
        while (k < file.length()) {
            int j = buff.read(b, 0, 1024);
            k += j;
            myout.write(b, 0, j);
        }
        myout.flush();
        buff.close();
        fis.close();
        myout.close();
        file.delete();
    }

　　 /**
     * 读取excel表头
     * 
     * @param file
     * @return
     * @throws IOException
     */
    @SuppressWarnings("unused")
    private String[] readExcelHead(File file) throws IOException {
        HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(file));
        HSSFSheet sheet = wb.getSheetAt(0);
        HSSFRow row = null;
        HSSFCell cell = null;
        row = sheet.getRow(0);
        String[] buff = new String[row.getLastCellNum()];
        for (int i = row.getFirstCellNum(); i < row.getLastCellNum(); i++) {
            cell = row.getCell(i);
            buff[i] = cell.getStringCellValue();
        }
        return buff;
    }

　　 /**
     * 读取2003excel
     * 
     * @param file
     * @return
     */
    private List<List<Object>> read2003Excel(File file) throws IOException {
        List<List<Object>> dataList = new ArrayList<List<Object>>();
        HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(file));
        HSSFSheet sheet = wb.getSheetAt(0);
        HSSFRow row = null;
        HSSFCell cell = null;
        Object val = null;
        DecimalFormat df = new DecimalFormat("0");// 格式化数字
        DecimalFormat df2 = new DecimalFormat("#0.00");// 格式化小数
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
        for (int i = sheet.getFirstRowNum() + 1; i < sheet.getPhysicalNumberOfRows(); i++) {
            row = sheet.getRow(i);
            if (row == null) {
                continue;
            }
            List<Object> objList = new ArrayList<Object>();
            for (int j = row.getFirstCellNum(); j < row.getLastCellNum(); j++) {
                cell = row.getCell(j);
                if (cell == null) {
                    val = null;
                    objList.add(val);
                    continue;
                }
                switch (cell.getCellType()) {
                case HSSFCell.CELL_TYPE_STRING:
                    val = cell.getStringCellValue();
                    break;
                case HSSFCell.CELL_TYPE_NUMERIC:
                    if ("@".equals(cell.getCellStyle().getDataFormatString())) {
                        if (j == 3) {
                            val = df2.format(cell.getNumericCellValue());
                        } else {
                            val = df.format(cell.getNumericCellValue());
                        }
                    } else if ("General".equals(cell.getCellStyle().getDataFormatString())) {
                        if (j == 3) {
                            val = df2.format(cell.getNumericCellValue());
                        } else {
                            val = df.format(cell.getNumericCellValue());
                        }
                    } else {
                        val = sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue()));
                    }
                    break;
                case HSSFCell.CELL_TYPE_BOOLEAN:
                    val = cell.getBooleanCellValue();
                    break;
                case HSSFCell.CELL_TYPE_BLANK:
                    val = "";
                    break;
                default:
                    val = cell.toString();
                    break;
                }
                objList.add(val);
            }
            dataList.add(objList);
        }
        return dataList;
    }

　　 /**
     * 读取2007excel
     * 
     * @param file
     * @return
     */

    private List<List<Object>> read2007Excel(File file) throws IOException {
        List<List<Object>> dataList = new ArrayList<List<Object>>();
        XSSFWorkbook xwb = new XSSFWorkbook(new FileInputStream(file));
        XSSFSheet sheet = xwb.getSheetAt(0);
        XSSFRow row = null;
        XSSFCell cell = null;
        Object val = null;
        DecimalFormat df = new DecimalFormat("0");// 格式化数字
        DecimalFormat df2 = new DecimalFormat("#0.00");// 格式化小数
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
        for (int i = sheet.getFirstRowNum() + 1; i < sheet.getPhysicalNumberOfRows(); i++) {
            row = sheet.getRow(i);
            if (row == null) {
                continue;
            }
            List<Object> objList = new ArrayList<Object>();
            for (int j = row.getFirstCellNum(); j < row.getLastCellNum(); j++) {
                cell = row.getCell(j);
                if (cell == null) {
                    val = null;
                    objList.add(val);
                    continue;
                }
                switch (cell.getCellType()) {
                case XSSFCell.CELL_TYPE_STRING:
                    val = cell.getStringCellValue();
                    break;
                case XSSFCell.CELL_TYPE_NUMERIC:
                    if ("@".equals(cell.getCellStyle().getDataFormatString())) {
                        if (j == 3) {
                            val = df2.format(cell.getNumericCellValue());
                        } else {
                            val = df.format(cell.getNumericCellValue());
                        }
                    } else if ("General".equals(cell.getCellStyle().getDataFormatString())) {
                        if (j == 3) {
                            val = df2.format(cell.getNumericCellValue());
                        } else {
                            val = df.format(cell.getNumericCellValue());
                        }
                    } else {
                        val = sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue()));
                    }
                    break;
                case XSSFCell.CELL_TYPE_BOOLEAN:
                    val = cell.getBooleanCellValue();
                    break;
                case XSSFCell.CELL_TYPE_BLANK:
                    val = "";
                    break;
                default:
                    val = cell.toString();
                    break;
                }
                objList.add(val);
            }
            dataList.add(objList);
        }
        return dataList;
    }