Excel 处理 poi

<!--生成EXCEL插件-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.14</version>
        </dependency>
        <!-- ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.14</version>
        </dependency>

1. 读取

    public List<Param> getSheets(String key) {
        try {
                Workbook workbook = WorkbookFactory.create(object.getObjectContent());
                Sheet sheet = workbook.getSheetAt(0);
                int idex;
                for (idex = 0;idex <= sheet.getLastRowNum(); idex++){
                    Row row = sheet.getRow(idex);
                    Cell a = row.getCell(0);
                    Cell b = row.getCell(1);
                
                    if (a.getCellType() == Cell.CELL_TYPE_NUMERIC) {
                        outParam.seta(new DecimalFormat("#").format(a.getNumericCellValue()));
                    } else {
                        outParam.seta(a.getStringCellValue());
                    }
                    if (b.getCellType() == Cell.CELL_TYPE_BLANK) {
                        outParam.setb("0");
                    } else {
                        if (b.getCellType() == Cell.CELL_TYPE_NUMERIC) {
                            outParam.setb(new DecimalFormat("#").format(b.getNumericCellValue()));
                        } else {
                            outParam.setb(b.getStringCellValue());
                        }
                    }
                    if (idex >= 1) {
                        ParamList.add(outParam);
                    }
                    retrun null;
    }

2. 写EXCEL
   /**

   • 生成创意xls表
     */
     private XSSFWorkbook getSheets(List<Param> List) {
     // 第一步，创建一个webbook，对应一个Excel文件
     XSSFWorkbook wb = new XSSFWorkbook();
     // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
     XSSFSheet sheet = wb.createSheet("report");
     // 第三步，在sheet中添加表头第0行
     XSSFRow row = sheet.createRow(0);
     // 第四步，创建单元格，并设置值表头 设置表头居中
     XSSFCellStyle style = wb.createCellStyle();
     style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

     XSSFCell cell = row.createCell(0);
     cell.setCellValue("老师");
     cell.setCellStyle(style);
     cell = row.createCell(1);
     cell.setCellValue("工号");
     cell.setCellStyle(style);
     // 第五步，写入实体数据
     int rowIndex = 1;
     for (Param DTO : List) {
     row = sheet.createRow(rowIndex++);
     row.createCell(0).setCellValue(DTO.getName());
     row.createCell(1).setCellValue(DTO.getId());
     }
     return wb;
     }