记录部分方法, 操作POI
POI version
3.10-FINAL
org.apache.poi
poi
${poi.version}
org.apache.poi
poi-ooxml
${poi.version}
1.首先根据路径读取Excel模板
/**
* 读取服务器上面的上传的excel文件
*
* @param path
* @return
*/
public static Workbook readWorkBook(String path) {
Workbook wb = null;
try {
wb = WorkbookFactory.create(new File(path));
} catch (InvalidFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return wb;
}
2.获取到workbook后，设置哪些行列是下拉框[Select下拉]，并设置数据
public String rewriteExcelTempAtEmp(String instance, String path, String upload) {
//读取默认模板Excel文件
Workbook workbook = ExcelUtils.readWorkBook(path);
Sheet sheet = workbook.getSheetAt(0);
DataValidationHelper helper = sheet.getDataValidationHelper();
//CellRangeAddressList(firstRow, lastRow, firstCol, lastCol)设置行列范围
CellRangeAddressList addressList = new CellRangeAddressList(3, 500, 17, 17);
//设置下拉框数据
String[]pos = posStatusName(instance);
DataValidationConstraint constraint = helper.createExplicitListConstraint(pos);
DataValidation dataValidation = helper.createValidation(constraint, addressList);
//处理Excel兼容性问题
if(dataValidation instanceof XSSFDataValidation) {
dataValidation.setSuppressDropDownArrow(true);
dataValidation.setShowErrorBox(true);
}else {
dataValidation.setSuppressDropDownArrow(false);
}
sheet.addValidationData(dataValidation);
String fileName = StringUtils.substringAfterLast(path, "/");
String newPath = upload+ExcelUtils.getRename(fileName, false);
//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
ExcelUtils.createExcel(workbook, newPath);
return newPath;
}
3.由于workbook读取后，在保存原来excel会出现错误，这个是poi的一个小bug吧，官方
也没有看到怎么解释，只能修改后, 重新命名保存一个新的Excel模板
/**
* 根据路径创建Excel
* @author lance
* 2014年8月13日 下午4:06:10
* @param workbook
* @param path
*/
public static 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();
}
}
}
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