EasyExcel使用方式（包含导出图片）

1、导EasyExcel依赖

<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.3.2</version>
</dependency>

2、创建导出excel的实体类

@Getter
@Setter
@EqualsAndHashCode
@HeadStyle(fillForegroundColor = 9)
@HeadFontStyle(fontHeightInPoints = 12, bold = BooleanEnum.TRUE)       //头字体   加粗
@HeadRowHeight(31)
@ContentStyle(horizontalAlignment = HorizontalAlignmentEnum.CENTER, verticalAlignment = VerticalAlignmentEnum.CENTER,borderTop = BorderStyleEnum.THIN,borderBottom = BorderStyleEnum.THIN,borderLeft = BorderStyleEnum.THIN,borderRight = BorderStyleEnum.THIN) //水平居中  垂直居中  上 下 左 右（边框线）
@ContentFontStyle(fontHeightInPoints = 11)    //内容字体
@ContentRowHeight(123)public class ExcelDto {@ExcelProperty(value = "序号", index = 0)  //意思为序号这一列为第0列（从0开始算）@ColumnWidth(14)private String number;@ExcelProperty(value = "姓名", index = 1)@ColumnWidth(18)private String name;@ExcelProperty(value = "时间", index = 2)@ColumnWidth(35)private Date time;@ColumnWidth(54)@ExcelProperty(value = "备注", index = 3)private String text;@ExcelProperty(value = "图片", index = 4)@ContentStyle(shrinkToFit = BooleanEnum.TRUE,borderTop = BorderStyleEnum.THIN,borderBottom = BorderStyleEnum.THIN,borderLeft = BorderStyleEnum.THIN,borderRight = BorderStyleEnum.THIN)  //上下左右（边框线）@ColumnWidth(43)private File image;  //file类型
}

3、代码进行逻辑赋值

controller

 /*** 导出excel*/@GetMapping(value = "/exportExcel")public void exportExcel(HttpServletResponse response, HttpServletRequest request,T entity) {jsjtProblemLabelService.exportExcel(response, request,entity);}

service

    /*** 导出* @param response* @param request*/public void exportExcel(HttpServletResponse response, HttpServletRequest request,T entity) {try {//创建导出excel的集合List<ExcelDto> list = ListUtils.newArrayList();//假设excelListBySQL 为数据库中查询数据的集合List<Excel> excelListBySQL = new ArrayList();//处理逻辑代码取出符合条件的值返回进excelListBySQL中 //循环赋值for (int i = 0; i < excelListBySQL.size(); i++) {//取出每一个从数据库中取出的对象Excel excel = excelListBySQL.get(i);//返回进导出excel的类中ExcelDto excelDto = new ExcelDto();//赋值序号excelDto.setNumber(String.valueOf(++number));//赋值姓名excelDto.setName(excel .getName());//赋值时间excelDto.setTime(excel .getTime());//赋值备注excelDto.setText(excel .getText());//赋值图片(数据库路径为相对路径)excelDto.setImage(imageByUrl(excel .getImageUrl())); //将每一行对象添加进导出excel的集合中list.add(excelDto);}String fileName = URLEncoder.encode("EasyExcel导出.xlsx", "UTF-8");OutputStream fileOutputStream = null;response.setHeader("Content-Disposition", "attachment;filename=" + fileName);response.setContentType("application/x-download");response.setCharacterEncoding("UTF-8");response.addHeader("Pargam", "no-cache");response.addHeader("Cache-Control", "no-cache");response.flushBuffer();fileOutputStream = response.getOutputStream();ExcelWriter excelWriter = EasyExcel.write(fileOutputStream, ExcelDto.class).build();WriteSheet sheet = EasyExcel.writerSheet(0, "sheet1").build();  //控制sheet页excelWriter.write(list, sheet);excelWriter.finish();fileOutputStream.flush();fileOutputStream.close();} catch (Exception e) {e.getMessage();}}/***将string类型的url转换为文件*/public File imageByUrl(String imageUrl) throws Exception{if (StringUtils.isBlank(imageUrl)){return null;}//指定读取的图片文件URI uri = new URI("file:///" + path+"/"+imageUrl);File file = new File(uri);//存在返回file否则返回nullreturn file.exists() ?  file :  null;  }