easyExcel根据ExcelDTO生成excel并导出自定义样式

@Override
    public String exportExcelModel(HttpServletResponse response) {
        OutputStream outputStream = ExcelUtils.getResponseOutputStream(response, "导入模板");
        ExcelWriterBuilder excelWriterBuilder = EasyExcel.write(outputStream).registerWriteHandler(new CustomCellWriteHandler()).excelType(ExcelTypeEnum.XLSX);
        ExcelWriter excelWriter = excelWriterBuilder.build();

        ExcelUtils.writeOnly(excelWriter, importAssignExcelDemo(), OneExcelDTO.class, 1, "模板数据");
        ExcelUtils.writeOnly(excelWriter, describeDemo(), TwoExcelDTO.class, 2, "详细说明");
        try {
            ExcelUtils.finishWriter(outputStream, excelWriter);
        } catch (Exception e) {
            System.out.println("导出异常！！！");
            e.printStackTrace();
        }
        return "导出指定模板结束";
    }

/**
 * 生成excel文件指定sheet页
 *
 * @param excelWriter
 * @param data
 * @param clazz
 * @param sheetNo
 * @param sheetName
 * @param <T>
 */

public static <T> void writeOnly(ExcelWriter excelWriter, List<T> data, Class clazz,Integer sheetNo,String sheetName){

        ExcelWriterSheetBuilder excelWriterSheetBuilder;
        WriteSheet writeSheet = new WriteSheet();
        excelWriterSheetBuilder = new ExcelWriterSheetBuilder(excelWriter);
        excelWriterSheetBuilder.sheetNo(sheetNo);
        excelWriterSheetBuilder.sheetName(sheetName);
        writeSheet.setSheetNo(sheetNo);
        writeSheet.setSheetName(sheetName);
        writeSheet.setClazz(clazz);
        excelWriter.write(data,writeSheet);
    }

    public static void finishWriter(OutputStream outputStream,ExcelWriter excelWriter) throws IOException {
        outputStream.flush();
        excelWriter.finish();
        outputStream.close();
        System.out.println("结束！！！");
    }

　　

自定义样式监听类：
继承抽象策略

public class CustomCellWriteHandler extends AbstractCellStyleStrategy {

    private WriteCellStyle headWriteCellStyle;
    private List<WriteCellStyle> contentWriteCellStyleList;
    private CellStyle headCellStyle;
    private List<CellStyle> contentCellStyleList;

    public CustomCellWriteHandler(WriteCellStyle headWriteCellStyle, List<WriteCellStyle> contentWriteCellStyleList) {
        this.headWriteCellStyle = headWriteCellStyle;
        this.contentWriteCellStyleList = contentWriteCellStyleList;
    }

    public CustomCellWriteHandler(WriteCellStyle headWriteCellStyle, WriteCellStyle contentWriteCellStyle) {
        this.headWriteCellStyle = headWriteCellStyle;
        this.contentWriteCellStyleList = new ArrayList();
        this.contentWriteCellStyleList.add(contentWriteCellStyle);
    }
    @Override
    protected void initCellStyle(Workbook workbook) {
        if (this.headWriteCellStyle != null) {
            this.headCellStyle = StyleUtil.buildHeadCellStyle(workbook, this.headWriteCellStyle);
        }

        if (this.contentWriteCellStyleList != null && !this.contentWriteCellStyleList.isEmpty()) {
            this.contentCellStyleList = new ArrayList();
            Iterator var2 = this.contentWriteCellStyleList.iterator();

            while(var2.hasNext()) {
                WriteCellStyle writeCellStyle = (WriteCellStyle)var2.next();
                this.contentCellStyleList.add(StyleUtil.buildContentCellStyle(workbook, writeCellStyle));
            }
        }

    }
    @Override
    protected void setHeadCellStyle(Cell cell, Head head, Integer relativeRowIndex) {
        if (this.headCellStyle != null) {
            cell.setCellStyle(this.headCellStyle);
        }
    }
    @Override
    protected void setContentCellStyle(Cell cell, Head head, Integer relativeRowIndex) {
        if (this.contentCellStyleList != null && !this.contentCellStyleList.isEmpty()) {

            // 这里可以对cell进行任何操作
            Workbook workbook = cell.getSheet().getWorkbook();
            CellStyle headStyle = getContentStyle(workbook, cell);
            cell.setCellStyle(headStyle);

//            cell.setCellStyle((CellStyle)this.contentCellStyleList.get(relativeRowIndex % this.contentCellStyleList.size()));
        }
    }



    /*
     * 表内容样式
     */
    public static CellStyle getContentStyle(Workbook workbook, Cell cell) {
        // 设置字体
        Font font = workbook.createFont();
        //设置字体大小
        font.setFontHeightInPoints((short) 11);
        //字体加粗
        font.setBold(false);
        //斜体
        font.setItalic(true);
        //设置字体名字
        font.setFontName("宋体");
        //设置样式;
        CellStyle style = workbook.createCellStyle();
        if(cell.getRowIndex() == 1){
        //第一行示例数据 红色 宋体 斜体
        font.setColor(IndexedColors.RED.getIndex());//字体颜色=红色
        }
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(true);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HorizontalAlignment.CENTER);
        //数据规范信息描述，加粗、靠左，通过内容指定内容格式
        if(cell.getColumnIndex()==0 && cell.getStringCellValue().contains("导入数据规范说明")){
            font.setBold(true);
            style.setAlignment(HorizontalAlignment.LEFT);
        }
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        return style;
    }

　　

参考链接地址：

https://blog.csdn.net/m0_46109609/article/details/109774365
https://www.cnblogs.com/Hizy/p/11825886.html