POI操作excel

java操作excel是很常见的，那么下面给出一些代码来操作excel表

首先是写

    /**
     * 根据一个从数据库中查出的集合，把它写成excel
     * @param db
     */
    public void writerExcel(List<BusinessExtrac> db,String filePath){
        try{
            String[] key = {"ID","商家","提现金额","提现时间","开户省份","开户城市","开户支行","开户人","银行卡号","提现状态"};
            File file = new File(filePath);
            if(!file.exists()){
                file.createNewFile();
            }
            XSSFWorkbook book = new XSSFWorkbook();
            XSSFSheet sheet = book.createSheet("商家提现");
            XSSFCell cell = null;
            //锁定表头，这样表头就会固定在最上方，第一个参数是列，第二个参数是行，这里固定了两行
            sheet.createFreezePane(0, 2);
            
            //设置第二列的宽度，也就是商家列的宽度
            sheet.setColumnWidth(1, 8000);
            //设置第三列的宽度
            sheet.setColumnWidth(2, 4000);
            //设置第四列的宽度，也就是提现时间
            sheet.setColumnWidth(3, 8000);
            sheet.setColumnWidth(4, 3000);
            sheet.setColumnWidth(5, 3000);
            sheet.setColumnWidth(6, 3000);
            sheet.setColumnWidth(7, 3000);
            //设置第五列的宽度，也就是银行卡号
            sheet.setColumnWidth(8, 7000);
            //审核状态
            sheet.setColumnWidth(9, 3000);
            //设置第一列，把id列隐藏
            sheet.setColumnHidden(0, true);
            //合并第一列的单元格
            sheet.addMergedRegion(new CellRangeAddress(0,0,0,9));
            XSSFRow title = sheet.createRow(0);
            //设置第一行的行高
            title.setHeightInPoints(70);
            
            XSSFCell tc = title.createCell(0);
            tc.setCellStyle(this.getTitleStyle(book));
            tc.setCellValue("绿色区域外的内容只作提示，请不要更改，绿色区域内容只允许填写两个值，请不要写其它值(1 为提现失败，2为提现成功，无论您填写什么值，都请确保财务部门正确处理)");
            
            //标题栏
            XSSFRow row = sheet.createRow(1);
            //填写key
            for(int i=0;i<key.length;i++){
                cell = row.createCell(i);
                cell.setCellValue(key[i]);
                cell.setCellStyle(this.getKeyStyle(book));
            }
            //填写value
            for(int i=0;i<db.size();i++){
                row = sheet.createRow(i+2);
                BusinessExtrac extrac = db.get(i);
                //数据库id
                cell = row.createCell(0);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(extrac.getId());
                //商家名字
                cell = row.createCell(1);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(extrac.getBusinessName());
                //提现金额
                cell = row.createCell(2);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(extrac.getExtrac_money());
                //提现时间
                cell = row.createCell(3);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(DateUtils.formatDateByFormat(extrac.getExtrac_time(), "yyyy-MM-dd HH:mm:ss"));
                //开户省
                cell = row.createCell(4);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(extrac.getBankProvince());
                //开户城市
                cell = row.createCell(5);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(extrac.getBankCity());
                //开户支行
                cell = row.createCell(6);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(extrac.getBankChildName());
                //开户人
                cell = row.createCell(7);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(extrac.getAccountUser());
                //银行卡号
                cell = row.createCell(8);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(EncryptionUtils.decrypt(extrac.getBank_card_no(), EncryptionUtils.backkey));
                //审核状态
                cell = row.createCell(9);
                cell.setCellStyle(this.getBorderStyle(book));
                cell.setCellValue(extrac.getExtrac_status().toString());
                cell.setCellStyle(this.getStatusStyle(book));
            }
            book.write(new FileOutputStream(file));
            book.close();
        }catch(IOException e){
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 得到审核状态的默认样式
     * @return
     */
    public XSSFCellStyle getStatusStyle(XSSFWorkbook book){
        XSSFCellStyle style = book.createCellStyle();
        style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        style.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
//        style.setFillBackgroundColor((short)13);
        style.setFillForegroundColor(IndexedColors.GREEN.index);
        style.setBorderTop(XSSFCellStyle.BORDER_THIN);
        style.setBorderRight(XSSFCellStyle.BORDER_THIN);
        style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        return style;
    }
    
    /**
     * 得到标题样式
     * @param style
     * @return
     */
    public XSSFCellStyle getTitleStyle(XSSFWorkbook book){
        XSSFCellStyle style = book.createCellStyle();
        style.setBorderTop(XSSFCellStyle.BORDER_THIN);
        style.setBorderRight(XSSFCellStyle.BORDER_THIN);
        style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        //自动换行
        style.setWrapText(true);
        //字体
        XSSFFont font = book.createFont();
        font.setFontHeightInPoints((short)16);
        font.setColor(IndexedColors.RED.index);
        style.setFont(font);
        return style;
    }
    /**
     * 得到key的样式
     * @param book
     * @return
     */
    public XSSFCellStyle getKeyStyle(XSSFWorkbook book){
        XSSFCellStyle style = book.createCellStyle();
        style.setBorderTop(XSSFCellStyle.BORDER_THIN);
        style.setBorderRight(XSSFCellStyle.BORDER_THIN);
        style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        //字体
        XSSFFont font = book.createFont();
        font.setColor(IndexedColors.BLUE.index);
        font.setFontHeightInPoints((short)15);
        style.setFont(font);
        return style;
    }
    /**
     * 得到边框的样式
     * @param book
     * @return
     */
    public XSSFCellStyle getBorderStyle(XSSFWorkbook book){
        XSSFCellStyle style = book.createCellStyle();
        style.setBorderTop(XSSFCellStyle.BORDER_THIN);
        style.setBorderRight(XSSFCellStyle.BORDER_THIN);
        style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        return style;
    }

再接下来是读:

public int uploadExcel(MultipartFile excel,String tempPath) throws IOException {
        //判断文件是否有上传
        String fileName = excel.getOriginalFilename();
        if(fileName == null || fileName.trim().equals("")){
            return -1;
        }
        
        //把文件保存在临时目录，但是操作完之后要删除这个文件
        UploadUtil.saveFileByPath(excel, tempPath);
        
        XSSFWorkbook book = new XSSFWorkbook(tempPath);
        XSSFSheet sheet = book.getSheetAt(0);
        //得到共有多少行
        int rowNum = sheet.getLastRowNum();
        
        List<BusinessExtrac> list = new ArrayList<BusinessExtrac>();
        
        for(int i=2;i<=rowNum;i++){
            BusinessExtrac extrac = new BusinessExtrac();
            XSSFRow row = sheet.getRow(i);
            //id
            String is = cellStringUtil(row.getCell(0)).toString();
            double log = Double.parseDouble(is);
            
            extrac.setId((int)log);
            //商家名称
            String businessName = cellStringUtil(row.getCell(1));
            extrac.setBusinessName(businessName);
            //提现金额
            String money = cellStringUtil(row.getCell(2));
            extrac.setExtrac_money(Double.parseDouble(money));
            //提现时间
            String date = cellStringUtil(row.getCell(3));
            extrac.setExtrac_time(DateUtils.parseDate(date, "yyyy-MM-dd HH:mm:ss"));
            //开户省份
            String province = cellStringUtil(row.getCell(4));
            extrac.setBankProvince(province);
            //开户城市
            String city = cellStringUtil(row.getCell(5));
            extrac.setBankCity(city);
            //开户支行
            String bankChild = cellStringUtil(row.getCell(6));
            extrac.setBankChildName(bankChild);
            //开户人
            String person = cellStringUtil(row.getCell(7));
            extrac.setAccountUser(person);
            //银行卡号
            String account = cellStringUtil(row.getCell(8));
            extrac.setBank_card_no(account);
            //提现状态
            int status = (int)Double.parseDouble(cellStringUtil(row.getCell(9)).trim());
            //如果状态不为1 和 2，则报错
            if(status != 1 && status != 2){
                book.close();
                return 10;
            }
            extrac.setExtrac_status(status);
            
            list.add(extrac);
        }
    
        book.close();
        new File(tempPath).delete();
        System.out.println("excel上传成功!");
        System.out.println(list);
        
        //数据读取成功，所以需要把excel删除
        
        
        //处理数据库中的提现成功，或者提现失败
        
        for(BusinessExtrac xls : list){
            //判断属于这条纪录的数据，在数据库中的状态，如果不是2，则返回错误
            int status = extrac_Dao.getStatusById(xls.getId());
            if(status!=2){
                //上传过已经上传过的数据
                return 11;
            }else{
                //需要更改数据库中的记录，把状态改为上传成功，或者上传失败
                int tus = xls.getExtrac_status() == 1 ? 4 : 3;
                if(xls.getExtrac_status() == 1){
                    //提现失败
                    //状态改为提现失败
                    extrac_Dao.setStatusById(xls.getId(),4);
                }else if(xls.getExtrac_status() == 2){
                    //操作成功，把状态改为提现成功
                    extrac_Dao.setStatusById(xls.getId(),3);
                    
                    Double extrac_money = extrac_Dao.getExtracMoneyById(xls.getId());
                    int businessId = extrac_Dao.getBusinessById(xls.getId());
                    extrac_Dao.updateBusinessExtrac(extrac_money,businessId);
                }
            }
        }
        
        return 1;
    }