POI——动态修改Excel模板下拉框

需求：

在导入页面放置了的Excel模板，最开始内容是写死的。现在需要将数据库的数据动态的加载到excel模板的下拉框中。使用的为poi.xssf

相关jar包

poi-3.10-FINAL-20140208.jar

poi-ooxml-3.10-FINAL-20140208.jar

poi-ooxml-schemas-3.10-FINAL-20140208.jar

方法思路：

读取Excel模板文件——从数据库读取下拉框所需数据——将读取出的数据先写入另一张sheet（数据源sheet）——为展示数据的sheet设置数据验证规则，增加数据验证——将更新后的workbook保存到新的path

该方法返回path到controller，之后经过文件流处理即可实现模板的下载

/**
* update poi select
* @param realPath
* @author cloudHeart
* @throws FileNotFoundException
*/
public String setPOISelect(String realPath) throws FileNotFoundException {
InputStream is = null;
XSSFWorkbook wb = null;

//读取文件
try {
is = new FileInputStream(new File(realPath));
wb = new XSSFWorkbook(is);
XSSFSheet sheet = wb.getSheetAt(0);
int rows = sheet.getLastRowNum() + 1; //行数
System.out.println("rows = " + rows);

//设置部门下拉框
ArrayList<String> orgNameList = new ArrayList<>(30);
List<Org> orgList = dao.findAll();
for (Org one : orgList) {
String name = one.getOrgName();
orgNameList.add(name);
}
String[] orgArray = orgNameList.toArray(new String[orgNameList.size()]);
wb = selectUpda're(wb, sheet, orgArray, 2, 9, 1, 1, 2, 'B');

//由于POI打开读取文件后再保存时bug问题, 只能重新定义一个新的Excel写入数据
String subPath = realPath.substring(0, realPath.lastIndexOf("\\"));
String path = subPath.concat("\\模板");
createExcel(wb, path);
return path;

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return realPath;

}

因为可能更新多个不同类型下拉框数据，所以设置了selectNum和selectAlpha

/**
* @param wb XSSFWorkbook对象
* @param realSheet 需要操作的sheet对象
* @param datas 下拉的列表数据
* @param startRow 开始行
* @param endRow 结束行
* @param startCol 开始列
* @param endCol 结束列
* @param selectMum 数据源sheet的下拉数据源对应列
* @param selectAlpha 数据源sheet的下拉数据对应字母
* @return
* @throws Exception
*/
public XSSFWorkbook dropDownList2003(XSSFWorkbook wb, XSSFSheet realSheet, String[] datas, int startRow, int endRow,
int startCol, int endCol, int selectNum ,char seletAlpha)
throws Exception {
String hiddenSheetName = "字典项";
// XSSFWorkbook workbook = (XSSFWorkbook) wb;
// 数据源sheet 原模板已有专门的数据源sheet，没有的话用 wb.createSheet("名称")创建一个即可
XSSFSheet hidden = (XSSFSheet) wb.getSheetAt(1);
// 数据源sheet页不显示
wb.setSheetHidden(1, true);
// 将下拉列表的数据放在数据源sheet上
XSSFRow row = null;
XSSFCell cell = null;
for (int i = 0, length = datas.length; i < length; i++) {
//row = hidden.createRow(i);
row = hidden.getRow(i);
if(row == null || ("").equals(row)){
row = hidden.createRow(i);
}
cell = row.getCell(selectNum-1);
if(cell == null || ("").equals(cell)){
cell = row.createCell(selectNum -1);
}
cell.setCellValue(datas[i]);
}
//创建规则
XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(realSheet);
XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint) dvHelper
.createFormulaListConstraint(hiddenSheetName + "!$"+seletAlpha+"$1:$"+seletAlpha+"" + datas.length);
//DataValidationConstraint  constraint = DVConstraint.createFormulaListConstraint(hiddenSheetName + "!$"+seletAlpha+"$1:$"+seletAlpha+"" + datas.length);
CellRangeAddressList addressList = null; // 设定在哪个单元格生效
DataValidation validation = null; // 创建规则对象
row = null;
cell = null;
// 循环指定单元格下拉数据
for (int i = startRow; i <= endRow; i++) {
row = (XSSFRow) realSheet.getRow(i);
cell = row.getCell(startCol);
addressList = new CellRangeAddressList(i, i, startCol, endCol);
validation = dvHelper.createValidation(dvConstraint, addressList);
//validation = new HSSFDataValidation(addressList, constraint);
//HSSF和XSSF的创建数据验
9a3e
证有区别 realSheet.addValidationData(validation);
realSheet.addValidationData(validation);
}

return wb;
}

根据路径创建Excel

/**
* 根据路径创建Excel
* @param workbook
* @param path
*/
public void createExcel(Workbook workbook, String path) {
FileOutputStream fileOut = null;
try {
fileOut = new FileOutputStream(path);
workbook.write(fileOut);
} catch (Exception e) {
logger.error("Error create excel: ", e.getMessage());
} finally {
try {
if(fileOut != null) {
fileOut.close();
}

} catch (IOException e) {
e.printStackTrace();
}
}
}