import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DataValidation;
import org.apache.poi.ss.usermodel.DataValidationConstraint;
import org.apache.poi.ss.usermodel.Name;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.usermodel.XSSFDataValidation;
import org.apache.poi.xssf.usermodel.XSSFDataValidationConstraint;
import org.apache.poi.xssf.usermodel.XSSFDataValidationHelper;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ExcelDemo2 {
public static void main(String[] args) {
Cascade();
}
public static void Cascade() {
String fileName = "test02.xlsx";
// 创建一个excel
// @SuppressWarnings("resource")
XSSFWorkbook workbook = new XSSFWorkbook();
//第一级首行
int firstRow = 1;
//第一级一共到多少列
int lastRow = 49;
//第一级所在列
int firstCol = 0;
//第一级所在列的列字符
String offset = "A";
int lastCol = firstCol;
//第二级所在列
int secondeCol = 3;
//隐藏sheet页的名称
String hideSheetName = "level";
// 创建需要用户填写的sheet
XSSFSheet sheet = workbook.createSheet("设备列表");
Row row0 = sheet.createRow(0);
//第一级
row0.createCell(firstCol).setCellValue("设备品牌");
//第二级
row0.createCell(secondeCol).setCellValue("设备型号");
//品牌列表
String[] firstArr = {"葆德","许继","石家庄科林","北京易艾斯德"};
//设备型号
String[] baode = {"XWL-PD35A"};
String[] xuji = {"XD930AB2","XD930AB4","MBU80"};
String[] kelin = {"KLD8500"};
String[] eaisd = {"EM600LCD"};
Map<String,String[]> levelMap = new HashMap<>();
levelMap.put("葆德",baode);
levelMap.put("许继",xuji);
levelMap.put("石家庄科林",kelin);
levelMap.put("北京易艾斯德",eaisd);
prepareDataSheet(workbook, hideSheetName, firstArr, levelMap);
XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
// 省规则
DataValidationConstraint provConstraint = dvHelper.createExplicitListConstraint(firstArr);
// 四个参数分别是：起始行、终止行、起始列、终止列
CellRangeAddressList provRangeAddressList = new CellRangeAddressList(firstRow, lastRow, firstCol, lastCol);
DataValidation provinceDataValidation = dvHelper.createValidation(provConstraint, provRangeAddressList);
//验证
provinceDataValidation.createErrorBox("error", "请选择正确的品牌");
provinceDataValidation.setShowErrorBox(true);
provinceDataValidation.setSuppressDropDownArrow(true);
sheet.addValidationData(provinceDataValidation);
//对前20行设置有效性
for(int i = firstRow;i <= lastRow;i++){
setDataValidation(offset ,sheet,i,secondeCol);
}
FileOutputStream os = null;
try {
os = new FileOutputStream(fileName);
workbook.write(os);
} catch (Exception e) {
e.printStackTrace();
} finally {
IOUtils.closeQuietly(os);
}
}
private static void prepareDataSheet(XSSFWorkbook workbook, String hideSheetName, String[] firstArr, Map<String, String[]> levelMap) {
//创建一个专门用来存放地区信息的隐藏sheet页
//因此也不能在现实页之前创建，否则无法隐藏。
Sheet hideSheet = workbook.createSheet(hideSheetName);
//这一行作用是将此sheet隐藏，功能未完成时注释此行,可以查看隐藏sheet中信息是否正确
workbook.setSheetHidden(workbook.getSheetIndex(hideSheet), true);
//--设置引用的数据 start --//
int rowId = 0;
// 设置第一行，存省的信息
Row brandRow = hideSheet.createRow(rowId++);
brandRow.createCell(0).setCellValue("第一级");
for(int i = 0; i < firstArr.length; i ++){
Cell provinceCell = brandRow.createCell(i + 1);
provinceCell.setCellValue(firstArr[i]);
}
// 将具体的数据写入到每一行中，行开头为父级区域，后面是子区域。
for(int i = 0; i < firstArr.length; i++){
String key = firstArr[i];
String[] secondArr = levelMap.get(key);
Row row1 = hideSheet.createRow(rowId++);
row1.createCell(0).setCellValue(key);
for(int j = 0; j < secondArr.length; j ++){
Cell cell0 = row1.createCell(j + 1);
cell0.setCellValue(secondArr[j]);
}
// 添加名称管理器
String range = getRange(1, rowId, secondArr.length);
Name name = workbook.createName();
//key不可重复
name.setNameName(key);
String formula = hideSheetName +"!" + range;
name.setRefersToFormula(formula);
}
}
/**
* 设置有效性
* @param offset 主影响单元格所在列，即此单元格由哪个单元格影响联动
* @param sheet
* @param rowNum 行数
* @param colNum 列数
*/
public static void setDataValidation(String offset,XSSFSheet sheet, int rowNum,int colNum) {
XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
DataValidation data_validation_list;
int offsetRow = rowNum+1;
data_validation_list = getDataValidationByFormula(
"INDIRECT($" + offset + (offsetRow) + ")", rowNum, colNum,dvHelper);
sheet.addValidationData(data_validation_list);
}
/**
* 加载下拉列表内容
* @param formulaString
* @param naturalRowIndex
* @param naturalColumnIndex
* @param dvHelper
* @return
*/
private static DataValidation getDataValidationByFormula(
String formulaString, int naturalRowIndex, int naturalColumnIndex,XSSFDataValidationHelper dvHelper) {
// 加载下拉列表内容
// 举例：若formulaString = "INDIRECT($A$2)" 表示规则数据会从名称管理器中获取key与单元格 A2 值相同的数据，
//如果A2是江苏省，那么此处就是江苏省下的市信息。
XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint) dvHelper.createFormulaListConstraint(formulaString);
// 设置数据有效性加载在哪个单元格上。
// 四个参数分别是：起始行、终止行、起始列、终止列
int firstRow = naturalRowIndex;
int lastRow = naturalRowIndex;
int firstCol = naturalColumnIndex;
int lastCol = naturalColumnIndex;
CellRangeAddressList regions = new CellRangeAddressList(firstRow,
lastRow, firstCol, lastCol);
// 数据有效性对象
// 绑定
XSSFDataValidation data_validation_list = (XSSFDataValidation) dvHelper.createValidation(dvConstraint, regions);
data_validation_list.setEmptyCellAllowed(false);
if (data_validation_list instanceof XSSFDataValidation) {
data_validation_list.setSuppressDropDownArrow(true);
data_validation_list.setShowErrorBox(true);
} else {
data_validation_list.setSuppressDropDownArrow(false);
}
// 设置输入信息提示信息
data_validation_list.createPromptBox("下拉选择提示", "请使用下拉方式选择合适的值！");
// 设置输入错误提示信息
//data_validation_list.createErrorBox("选择错误提示", "你输入的值未在备选列表中，请下拉选择合适的值！");
return data_validation_list;
}
/**
* 计算formula
* @param offset 偏移量，如果给0，表示从A列开始，1，就是从B列
* @param rowId 第几行
* @param colCount 一共多少列
* @return 如果给入参 1,1,10. 表示从B1-K1。最终返回 $B$1:$K$1
*
*/
public static String getRange(int offset, int rowId, int colCount) {
char start = (char)('A' + offset);
if (colCount <= 25) {
char end = (char)(start + colCount - 1);
return "$" + start + "$" + rowId + ":$" + end + "$" + rowId;
} else {
char endPrefix = 'A';
char endSuffix = 'A';
if ((colCount - 25) / 26 == 0 || colCount == 51) {// 26-51之间，包括边界（仅两次字母表计算）
if ((colCount - 25) % 26 == 0) {// 边界值
endSuffix = (char)('A' + 25);
} else {
endSuffix = (char)('A' + (colCount - 25) % 26 - 1);
}
} else {// 51以上
if ((colCount - 25) % 26 == 0) {
endSuffix = (char)('A' + 25);
endPrefix = (char)(endPrefix + (colCount - 25) / 26 - 1);
} else {
endSuffix = (char)('A' + (colCount - 25) % 26 - 1);
endPrefix = (char)(endPrefix + (colCount - 25) / 26);
}
}
return "$" + start + "$" + rowId + ":$" + endPrefix + endSuffix + "$" + rowId;
}
}
}生成的带下拉列表
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