EasyExcel 设置下拉不显示/下拉值超过255,解决方案!

最新推荐文章于 2025-02-20 17:27:16 发布

Double_zhi

最新推荐文章于 2025-02-20 17:27:16 发布

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分类专栏： EasyExcel 文章标签： java

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import java.util.Map;

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;

import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;

/**
 * @author pzz
 * @create 2021/9/30
 * @description 下拉自定义拦截器处理
 */
public class DropDownSetFieldCellWriteHandler implements SheetWriteHandler {

    
    private Map<Integer, String[]> map = null;

    public DropDownSetFieldCellWriteHandler(Map<Integer, String[]> map) {
        this.map = map;
    }

    @Override
    public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {}

    @Override
    public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
        //获取一个workbook
        Sheet sheet = writeSheetHolder.getSheet();
        //设置下拉框
        DataValidationHelper helper = sheet.getDataValidationHelper();
        //定义sheet的名称
        String hiddenName = "hidden";
        //1.创建一个隐藏的sheet 名称为 hidden
        Workbook workbook = writeWorkbookHolder.getWorkbook();
        Sheet hidden = workbook.createSheet(hiddenName);
        Name category1Name = workbook.createName();
        category1Name.setNameName(hiddenName);
        for (Map.Entry<Integer, String[]> entry : map.entrySet()) {
            //下拉框的起始行,结束行,起始列,结束列
            CellRangeAddressList addressList = new CellRangeAddressList(1, 2000, entry.getKey(), entry.getKey());
            //获取excel列名
            String excelLine = getExcelLine(entry.getKey());
            //2.循环赋值
            String[] values = entry.getValue();
            for (int i = 0, length = values.length; i < length; i++) {
                // 3:表示你开始的行数  3表示 你开始的列数
                Row row = hidden.getRow(i);
                if (row == null) {
                    row = hidden.createRow(i);
                }
                row.createCell(entry.getKey()).setCellValue(values[i]);
            }
            //4.  =hidden!$H:$1:$H$50  sheet为hidden的 H1列开始H50行数据获取下拉数组
            String refers = "="+hiddenName + "!$"+excelLine+
                    "$1:$"+excelLine +"$"+ (values.length);
            //5 将刚才设置的sheet引用到你的下拉列表中
            DataValidationConstraint constraint = helper.createFormulaListConstraint(refers);
            DataValidation dataValidation = helper.createValidation(constraint, addressList);
            writeSheetHolder.getSheet().addValidationData(dataValidation);
        }
        //设置列为隐藏
        int hiddenIndex = workbook.getSheetIndex("hidden");
        if (!workbook.isSheetHidden(hiddenIndex)) {
            workbook.setSheetHidden(hiddenIndex, true);
        }

    }

    /**
     * @Description 返回excel列标A-Z-AA-ZZ
     * @param num 列数
     * @return java.lang.String
     */
    public static String getExcelLine(int num) {
        String line = "";
        int first = num/26;
        int second = num % 26;
        if (first>0) {
            line = (char)('A'+first-1)+"";
        }
        line += (char)('A'+second)+"";
        return line;
    }
}