EasyExcel动态表头导出（支持多级表头）

EasyExcel动态表头导出（支持多级表头）

在很多业务场景中，都会应用到动态表头的导出，也会涉及到多级表头的导出，如下图所示

通过EasyExcel，我们可以快速实现这一需求，具体代码如下
DynamicHeader

1. import java.util.List;
3. /**
4. *@Author: <a target="_blank" href="https://www.cnblogs.com/mailto:fxsen@foxmail.com">Fxsen</a>
5. *@CreateTime: 2023年09月22日  09:16
6. */
7. public class DynamicHeader {
8.     /**
9.      * 要导出的字段名称英文
10.      */
11.     private String fieldName;
13.     /**
14.      * 要导出的表头名称中文
15.      */
16.     private String headName;
17.     /**
18.      * 如果是多级表都，插入下级
19.      */
20.     private List<DynamicHeader> children;
22.     public String getFieldName() {
23.         return fieldName;
24.     }
26.     public void setFieldName(String fieldName) {
27.         this.fieldName = fieldName;
28.     }
30.     public String getHeadName() {
31.         return headName;
32.     }
34.     public void setHeadName(String headName) {
35.         this.headName = headName;
36.     }
38.     public List<DynamicHeader> getChildren() {
39.         return children;
40.     }
42.     public void setChildren(List<DynamicHeader> children) {
43.         this.children = children;
44.     }
45. }

复制代码

CustomTitleWriteHandler
[code]import com.alibaba.excel.write.handler.SheetWriteHandler;import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;import org.apache.poi.ss.usermodel.CellStyle;import org.apache.poi.ss.usermodel.*;import org.apache.poi.ss.util.CellRangeAddress;public class CustomTitleWriteHandler implements SheetWriteHandler {    /**     * 标题     */    private final String fileName;    /**     * 字段个数     */    private final Integer count;    public CustomTitleWriteHandler(Integer count,String fileName) {        this.fileName = fileName;        this.count = count;    }    @Override    public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {    }    @Override    public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {        // 获取clazz所有的属性        Workbook workbook = writeWorkbookHolder.getWorkbook();        Sheet sheet = workbook.getSheetAt(0);        Row row1 = sheet.createRow(0);        row1.setHeight((short) 800);        Cell cell = row1.createCell(0);        //设置标题        cell.setCellValue(fileName);        CellStyle cellStyle = workbook.createCellStyle();        cellStyle.setBorderBottom(BorderStyle.THIN); //下边框        cellStyle.setBorderLeft(BorderStyle.THIN);//左边框        cellStyle.setBorderTop(BorderStyle.THIN);//上边框        cellStyle.setBorderRight(BorderStyle.THIN);//右边框        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);        cellStyle.setAlignment(HorizontalAlignment.CENTER);        Font font = workbook.createFont();        font.setBold(true);        font.setFontHeight((short) 400);        font.setFontName("宋体");        cellStyle.setFont(font);        cell.setCellStyle(cellStyle);        CellRangeAddress region = new CellRangeAddress(0, 0, 0, count - 1);        setRegionStyle(sheet,region,cellStyle);        sheet.addMergedRegion(region);    }    /**     * 为合并的单元格设置样式（可根据需要自行调整）     */    public static void setRegionStyle(Sheet sheet, CellRangeAddress region, CellStyle cs) {        for (int i = region.getFirstRow(); i