1.全局设置标题和内容字体格式

通过WriteCellStyle 的dataFormat属性和BuiltinFormats指定字体格式
这种单元格有内容时字体才会生效，无内容时还是"常规"格式

    private static WriteHandler templateWriteHandler;static {//表头样式WriteCellStyle headWriteCellStyle = new WriteCellStyle();//字体WriteFont headWriteFont = new WriteFont();headWriteFont.setFontHeightInPoints((short) 11);headWriteFont.setBold(true);headWriteCellStyle.setWriteFont(headWriteFont);//边框headWriteCellStyle.setBorderBottom(BorderStyle.THIN);headWriteCellStyle.setBorderLeft(BorderStyle.THIN);headWriteCellStyle.setBorderRight(BorderStyle.THIN);//前景色headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());//是否换行headWriteCellStyle.setWrapped(true);headWriteCellStyle.setLocked(true);//表体样式WriteCellStyle bodyWriteCellStyle = new WriteCellStyle();//设置数据格式索引bodyWriteCellStyle.setDataFormat((short)49);templateWriteHandler = new HorizontalCellStyleStrategy(headWriteCellStyle,bodyWriteCellStyle);}//快速根据索引获取字符串、或根据字符串获取索引public static void main(String[] args) {int builtinFormat = BuiltinFormats.getBuiltinFormat("h:mm:ss AM/PM");System.out.println(builtinFormat);String builtinFormat1 = BuiltinFormats.getBuiltinFormat(49);System.out.println(builtinFormat1);}

记得注册

        excelWriterBuilder.registerWriteHandler(templateWriteHandler);

2.个性化设置某一列格式

继承 AbstractVerticalCellStyleStrategy ，实现个性化方法单独设置某一列

package com.example.easyexceldemo.bo;import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.AbstractVerticalCellStyleStrategy;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.IndexedColors;public class DemoVerticalCellStyleStrategy extends AbstractVerticalCellStyleStrategy {@Overrideprotected WriteCellStyle headCellStyle(Head head) {WriteCellStyle headWriteCellStyle = new WriteCellStyle();//字体WriteFont headWriteFont = new WriteFont();headWriteFont.setFontHeightInPoints((short) 11);headWriteFont.setBold(true);headWriteCellStyle.setWriteFont(headWriteFont);//边框headWriteCellStyle.setBorderBottom(BorderStyle.THIN);headWriteCellStyle.setBorderLeft(BorderStyle.THIN);headWriteCellStyle.setBorderRight(BorderStyle.THIN);//前景色headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());//是否换行headWriteCellStyle.setWrapped(true);headWriteCellStyle.setLocked(true);return headWriteCellStyle;}@Overrideprotected WriteCellStyle contentCellStyle(Head head) {Integer columnIndex = head.getColumnIndex();//这里只单独设置第4列，看情况自己修改，DateFormat取值见 demo1 的 BuiltinFormats 类if(3 == columnIndex){WriteCellStyle bodyWriteCellStyle = new WriteCellStyle();//设置数据格式索引bodyWriteCellStyle.setDataFormat((short)49);return bodyWriteCellStyle;}else {return new WriteCellStyle();}}
}

记得注册

        excelWriterBuilder.registerWriteHandler(templateWriteHandler);

3.无内容时（预制模板，流形式写会）

其实我遇到的场景，就只是简单的空白模板，网上找了好多为无内容excel设置文本格式的资料，都没有解决。后来干脆把模板上传到resource。
在这里插入图片描述

在这里插入图片描述

    @GetMapping("/invoiceTemplateDownload2")public void templateDownload2(HttpServletResponse response) throws IOException {response.setContentType("application/vnd.ms-excel");response.setCharacterEncoding("utf-8");String fileName = URLEncoder.encode("模板", "UTF-8").replaceAll("\\+", "%20");response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");byte[] fileToByteArray = FileUtils.readFileToByteArray(new File("src/main/resources/invoiceTemplate.xlsx"));response.getOutputStream().write(fileToByteArray);}