poi生成excel设置单列为下拉列表值超过255问题解决方案

poi生成2003如下版本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();
    	// 建立模板工做表
    	Sheet sheet = wb.createSheet("test");
    	// 建立下拉列表值存储工做表并设置值
    	genearteOtherSheet(wb, typeArrays);
  
    	// 建立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做用
    	        sheet.addValidationData(SetDataValidation("typelist!$A$1:$A$" + typeArrays.length, 1, 0, typeArrays.length, 0));	
  
    	// 隐藏做为下拉列表值的Sheet
    	wb.setSheetHidden(wb.getSheetIndex("typelist"), 1);
  
    	return wb;
    }
  
    // 建立下拉列表值存储工做表并设置值
    public static void genearteOtherSheet(Workbook wb, String[] typeArrays) {
        // 建立下拉列表值存储工做表
        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);
    } 
  
    // 设置并引用其余Sheet做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行做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，从新打开，下拉列没法获取引用并取值

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();
    	// 建立模板工做表
    	Sheet sheet = wb.createSheet("test");
    	// 建立下拉列表值存储工做表并设置值
    	genearteOtherSheet(wb, typeArrays);
  
    	// 建立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做用
        sheet.addValidationData(SetDataValidation(wb, "typelist!$A$1:$A$" + typeArrays.length, 1, 0, typeArrays.length, 0));	
  
    	// 隐藏做为下拉列表值的Sheet
        wb.setSheetHidden(wb.getSheetIndex("typelist"), 1);
  
    	return wb;
    }
  
    // 建立下拉列表值存储工做表并设置值
    public static void genearteOtherSheet(Workbook wb, String[] typeArrays) {
        // 建立下拉列表值存储工做表
        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);
    } 
  
    // 设置并引用其余Sheet做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行做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

上述生成excel模板仅限于解决当前问题，若有兴趣，本身封装