POI操作Excel表格系列3 --- 背景颜色、边框等属性的读取和设置以及数据有效性的添加

color的读取
XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream("D:\\menu.xlsx"));
XSSFSheet xssfSheet = wb.getSheetAt(0);
XSSFRow xssfRow = xssfSheet.getRow(0);
XSSFCell cell = xssfRow.getCell(j);
XSSFCellStyle cellStyle = cell.getCellStyle();
XSSFColor color = cellStyle.getFillForegroundXSSFColor();
String color = color.getARGBHex();  // 前两位是透明度

color的设置   边框的设置
XSSFWorkbook wb = new XSSFWorkbook();
Sheet sheet = wb.createSheet();
Row row = sheet.createRow(i + 1);
Cell cell = row.createCell(0);
XSSFCellStyle cellStyle = wb.createCellStyle();
XSSFColor xssfColor = new XSSFColor();
xssfColor.setARGBHex(color);
cellStyle.setFillForegroundColor(xssfColor);
cellStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);
cellStyle.setBorderBottom(CellStyle.BORDER_THIN); // 下边框
cellStyle.setBorderLeft(CellStyle.BORDER_THIN);// 左边框
cellStyle.setBorderTop(CellStyle.BORDER_THIN);// 上边框
cellStyle.setBorderRight(CellStyle.BORDER_THIN);// 右边框
cell.setCellStyle(cellStyle);
cell.setCellValue(code);

// --- 数据有效性 下拉框选择 ---
DataValidationHelper helper = new XSSFDataValidationHelper((XSSFSheet) sheet);
XSSFDataValidationConstraint constraintBoolean = new XSSFDataValidationConstraint(textList);
CellRangeAddressList regionsBoolean = new CellRangeAddressList(1, 500, 6, 11);
DataValidation validationBoolean = helper.createValidation(constraintBoolean, regionsBoolean);
validationBoolean.createErrorBox("输入值有误", "请从下拉框选择");
validationBoolean.setShowErrorBox(true);
sheet.addValidationData(validationBoolean);

// --- 数据有效性 只允许输入整数 ---
DataValidationConstraint constraintNum = new XSSFDataValidationConstraint(
DataValidationConstraint.ValidationType.INTEGER,
DataValidationConstraint.OperatorType.GREATER_OR_EQUAL, "0");
CellRangeAddressList regionNumber = new CellRangeAddressList(1, 500, 4, 5);
DataValidation validationNum = helper.createValidation(constraintNum, regionNumber);
validationNum.createErrorBox("输入值类型出错", "数值型,请输入大于或等于0的整数值");
validationNum.setShowErrorBox(true);
sheet.addValidationData(validationNum);

// --- 数据有效性 只允许输入小数 ---
DataValidationConstraint constraintDecimal = new XSSFDataValidationConstraint(
DataValidationConstraint.ValidationType.DECIMAL,
DataValidationConstraint.OperatorType.GREATER_OR_EQUAL, "0");
CellRangeAddressList regionDecimal = new CellRangeAddressList(1, 500, 3, 3);
DataValidation validationDecimal = helper.createValidation(constraintDecimal, regionDecimal);
validationDecimal.createErrorBox("输入值类型出错", "数值型,请输入大于或等于0的小数值");
validationDecimal.setShowErrorBox(true);
sheet.addValidationData(validationDecimal);