easypoi如何下拉框

EasyPOI是一种用于在Java中生成Excel文件的开源库。要在Excel文件中添加下拉框，您需要使用EasyPOI的CellRangeAddressList类。

下面是一个简单的例子，展示了如何使用EasyPOI在第一列的每一行中添加一个下拉框，其中包含两个选项："选项1"和"选项2"：

import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.jeecgframework.poi.excel.annotation.Excel;
import org.jeecgframework.poi.excel.annotation.ExcelTarget;

@ExcelTarget("employee")
public class Employee {
    @Excel(name = "选择", orderNum = "1", isImportField = "true_st", needMerge = true)
    private String choose;

    public void setChoose(String choose) {
        this.choose = choose;
    }

    public String getChoose() {
        return choose;
    }
}

List<Employee> employees = new ArrayList<>();
for (int i = 0; i < 10; i++) {
    Employee employee = new Employee();
    employee.setChoose("选项1");
    employees.add(employee);
}

Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("员工信息", "员工"),
        Employee.class, employees);
Sheet sheet = workbook.getSheetAt(0);

String[] textlist = {"选项1", "选项2"};
CellRangeAddressList regions = new CellRangeAddressList(1, 10, 0, 0);
DVConstraint constraint = DVConstraint.createExplicitListConstraint(textlist);
HSSFDataValidation dataValidation = new HSSFDataValidation(regions, constraint);
sheet.addValidationData(dataValidation);

在上面的代码中，CellRangeAddressList类用于定义下拉框要出现的范围，DVConstraint类用于定义下拉框中的选项，然后将这些信息传递给HSSFDataValidation类来创建下拉框。最后，使用sheet.addValidationData()方