【下拉列表值超过255问题】poi生成excel设置单列-解决方案

poi生成2003以下版本excel（.xls后缀文件）

注意：该版本生成的会存在兼容性问题，下述会进行说明。

项目引用poi库的依赖 (略过)

构造生成excel模板方法// 传入下拉列表数组值，构造信息模板
public static Workbook generateExcel(String[] typeArrays) {
Workbook wb = new HSSFWorkbook();
// 创建模板工作表
Sheet sheet = wb.createSheet("test");
// 创建下拉列表值存储工作表并设置值
genearteOtherSheet(wb, typeArrays);

// 创建模板列信息并绑定下拉列表值
Row row = sheet.createRow(0);
// 设置列信息样式
setStyle(wb, sheet, 0);
setStyle(wb, sheet, 1);
// 绑定列信息
Cell nameCell = row.createCell((int) 0);
nameCell.setCellValue("名称");
Cell typeCell = row.createCell((int) 1);
typeCell.setCellValue("类型");

// 设置下拉列表直绑定对哪一页起作用
sheet.addValidationData(SetDataValidation("typelist!$A$1:$A$" + typeArrays.length, 1, 0, typeArrays.length, 0));

// 隐藏作为下拉列表值的Sheet
wb.setSheetHidden(wb.getSheetIndex("typelist"), 1);

return wb;
}

// 创建下拉列表值存储工作表并设置值
public static void genearteOtherSheet(Workbook wb, String[] typeArrays) {
// 创建下拉列表值存储工作表
Sheet sheet = wb.createSheet("typelist");
// 循环往该sheet中设置添加下拉列表的值
for (int i = 0; i < typeArrays.length; i++) {
Row row = sheet.createRow(i);
Cell cell = row.createCell((int) 0);
cell.setCellValue(typeArrays[i]);
}
}

// 设置列信息样式
public static void setStyle(Workbook wb, Sheet sheet,int colNum) {
CellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(CellStyle.ALIGN_CENTER);
DataFormat format = wb.createDataFormat();
cellStyle.setDataFormat(format.getFormat("@"));

sheet.setDefaultColumnStyle(colNum, cellStyle);
}

// 设置并引用其他Sheet作为绑定下拉列表数据
public static DataValidation SetDataValidation(String strFormula, int firstRow, int firstCol, int endRow, int endCol) {
// 表示A列1-59行作为下拉列表来源数据
// String formula = "typelist!$A$1:$A$59" ;
// 原顺序为 起始行 起始列 终止行 终止列
CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
// add
DVConstraint constraint = DVConstraint.createFormulaListConstraint(strFormula);
// add
DataValidation dataValidation = new HSSFDataValidation(regions, constraint);

return dataValidation;
}

public static void main(String[] args) throws Exception {
List<String> typelist = new ArrayList<String>();
for (int i = 0; i < 200; i++) {
typelist.add("T" + (0 + i));
}
String[] typeArrays = typelist.toArray(new String[typelist.size()]);
Workbook wb = generateExcel(typeArrays);
File tempFile = new File("C:\\Users\\gqd\\Desktop\\test.xls");
OutputStream os = new FileOutputStream(tempFile);

wb.write(os);
os.close();
}

问题点

单元格下拉选择值，保存提示引用兼容性问题
强制保存后，重新打开，下拉列无法获取引用并取值

poi生成2007以上版本excel（.xlsx后缀文件）

项目引用poi库的依赖 (略过)

构造生成excel模板方法// 传入下拉列表数组值，构造信息模板
public static Workbook generateExcel(String[] typeArrays) {
Workbook wb = new XSSFWorkbook();
// 创建模板工作表
Sheet sheet = wb.createSheet("test");
// 创建下拉列表值存储工作表并设置值
genearteOtherSheet(wb, typeArrays);

// 创建模板列信息并绑定下拉列表值
Row row = sheet.createRow(0);
// 设置列信息样式 -- 当前样式对于列信息未居中
setStyle(wb, sheet, 0);
setStyle(wb, sheet, 1);
// 绑定列信息
Cell nameCell = row.createCell((int) 0);
nameCell.setCellValue("名称");
Cell typeCell = row.createCell((int) 1);
typeCell.setCellValue("类型");

// 设置下拉列表直绑定对哪一页起作用
sheet.addValidationData(SetDataValidation(wb, "typelist!$A$1:$A$" + typeArrays.length, 1, 0, typeArrays.length, 0));

// 隐藏作为下拉列表值的Sheet
wb.setSheetHidden(wb.getSheetIndex("typelist"), 1);

return wb;
}

// 创建下拉列表值存储工作表并设置值
public static void genearteOtherSheet(Workbook wb, String[] typeArrays) {
// 创建下拉列表值存储工作表
Sheet sheet = wb.createSheet("typelist");
// 循环往该sheet中设置添加下拉列表的值
for (int i = 0; i < typeArrays.length; i++) {
Row row = sheet.createRow(i);
Cell cell = row.createCell((int) 0);
cell.setCellValue(typeArrays[i]);
}
}

// 设置列信息样式
public static void setStyle(Workbook wb, Sheet sheet,int colNum) {
CellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(CellStyle.ALIGN_CENTER);
DataFormat format = wb.createDataFormat();
cellStyle.setDataFormat(format.getFormat("@"));

sheet.setDefaultColumnStyle(colNum, cellStyle);
}

// 设置并引用其他Sheet作为绑定下拉列表数据
public static DataValidation SetDataValidation(Workbook wb, String strFormula, int firstRow, int firstCol, int endRow, int endCol) {
// 表示A列1-59行作为下拉列表来源数据
// String formula = "typelist!$A$1:$A$59" ;
// 原顺序为 起始行 起始列 终止行 终止列
CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
DataValidationHelper dvHelper = new XSSFDataValidationHelper((XSSFSheet) wb.getSheet("typelist"));
DataValidationConstraint formulaListConstraint = dvHelper.createFormulaListConstraint(strFormula);
DataValidation dataValidation = dvHelper.createValidation(formulaListConstraint, regions);

return dataValidation;
}

public static void main(String[] args) throws Exception {
List<String> typelist = new ArrayList<String>();
for (int i = 0; i < 200; i++) {
typelist.add("T" + (0 + i));
}
String[] typeArrays = typelist.toArray(new String[typelist.size()]);
Workbook wb = generateExcel(typeArrays);
File tempFile = new File("C:\\Users\\gqd\\Desktop\\test.xlsx");
OutputStream os = new FileOutputStream(tempFile);

wb.write(os);
os.close();
}

完美解决该问题

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