java poi导出图片到excel示例代码

本文实例为大家分享了java使用poi导出图片到Excel的具体代码，供大家参考，具体内容如下

代码实现

Controller

/**
 * 导出志愿者/人才数据
 * @param talent_type
 * @return
 */
@RequestMapping("/exportData")
public void exportData(Integer talent_type, HttpServletResponse response) {
  String fileId = UUID.randomUUID().toString().replace("-", "");
  Map<String, Object> param = new HashMap<>() ;
  param.put("talent_type", talent_type) ;
  try {
   List<Map<String, Object>> volunteerMapList = volunteerService.getExportData(param) ;
   String rootPath = SysConfigManager.getInstance().getText("/config/sys/rootPath");
   String filePath = rootPath + "/" + fileId + ".xlsx" ;
   volunteerService.exportData(volunteerMapList, filePath) ;
   // 下载
   FileInputStream inputStream = null;
   try{
     //设置发送到客户端的响应内容类型
     response.reset();
     response.setContentLength((int) new File(filePath).length());
     response.setContentType("application/octet-stream");
     response.addHeader("Content-Disposition", "attachment; filename=\"" + URLEncoder.encode("文件名.xlsx", "UTF-8")+ "\"");
     //读取本地图片输入流
     inputStream = new FileInputStream(filePath);
     // 循环取出流中的数据
     byte[] b = new byte[1024];
     int len;
     while ((len = inputStream.read(b)) > 0)
      response.getOutputStream().write(b, 0, len);
   } finally{
     if(inputStream != null){
      inputStream.close();
     }
   }
   logger.debug("导出志愿者/人才数据成功！");
  } catch (Exception e) {
   e.printStackTrace();
   logger.error("导出志愿者/人才数据异常！");
  }
}

Service

public void exportData(List<Map<String, Object>> volunteerMapList, String filePath) throws Exception {
   String[] alias = {"头像", "名称", "个人/团体", "志愿者/人才", "性别", "生日", "手机号",
       "身份证", "省份", "市", "区/县", "详细地址", "邮箱", "政治面貌", "学历", "民族",
       "职业", "团队人数", "艺术特长", "介绍"};
   String[] keys = {"photo", "name", "type", "talent_type", "sex", "birth_day", "mobile",
       "idcard", "province", "city", "county", "address", "email", "political",
       "education", "nation", "profession", "member_count", "art_spetiality", "content"};
   File file = new File(filePath);
   if (!file.exists()) file.createNewFile();
   FileOutputStream fileOutput = new FileOutputStream(file);
   XSSFWorkbook workbook = new XSSFWorkbook();
   int sheetSize = volunteerMapList.size() + 50;
   double sheetNo = Math.ceil(volunteerMapList.size() / sheetSize);
   String photoImgPath = SysConfigManager.getInstance().getText("/config/sys/rootPath") ;
   for (int index = 0; index <= sheetNo; index++) {
     XSSFSheet sheet = workbook.createSheet();
     workbook.setSheetName(index, "人才、志愿者" + index);
     XSSFRow row = sheet.createRow(0);
     sheet.setColumnWidth(0, 2048);
     XSSFCell cell;
     XSSFCellStyle cellStyle = workbook.createCellStyle();
     XSSFFont font = workbook.createFont();
     font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
     // 居中
     cellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
     // 加粗
     cellStyle.setFont(font);
     //创建标题
     for (int i = 0; i < alias.length; i++) {
       cell = row.createCell(i);
       cell.setCellValue(alias[i]);
       cell.setCellStyle(cellStyle);
     }
     int startNo = index * sheetSize;
     int endNo = Math.min(startNo + sheetSize, volunteerMapList.size());
     cellStyle = workbook.createCellStyle();
     // 居中
     cellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
     cellStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
     // 写入各条记录,每条记录对应excel表中的一行
     for (int i = startNo; i < endNo; i++) {
       int rowNum = i + 1 - startNo ;
       row = sheet.createRow(rowNum);
       Map<String, Object> map = (Map<String, Object>) volunteerMapList.get(i);
       for (int j = 0; j < keys.length; j++) {
         cell = row.createCell(j);
         String key = keys[j] ;
         if (key.equals("photo")){
           sheet.addMergedRegion(new CellRangeAddress(i + 1,i + 1,i + 1,i + 1)) ;
           // 头像
           File photoFile = new File(photoImgPath + map.get(key)) ;
           if (photoFile.exists()){
             BufferedImage bufferedImage = ImageIO.read(photoFile) ;
             ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
             ImageIO.write(bufferedImage, "jpg", byteArrayOut);
             byte[] data = byteArrayOut.toByteArray();
             XSSFDrawing drawingPatriarch = sheet.createDrawingPatriarch();
             XSSFClientAnchor anchor = new XSSFClientAnchor(480, 30, 700, 250, (short)0, i + 1, (short) 1, i + 2);
             drawingPatriarch.createPicture(anchor, workbook.addPicture(data, XSSFWorkbook.PICTURE_TYPE_JPEG));
             sheet.setColumnWidth((short)500, (short)500);
             row.setHeight((short)500);
           } else {
             cell.setCellType(XSSFCell.CELL_TYPE_STRING);
             cell.setCellValue("");
           }
         } else {
           cell.setCellType(XSSFCell.CELL_TYPE_STRING);
           Object value = map.get(key);
           cell.setCellValue(value == null ? "" : value.toString());
           cell.setCellStyle(cellStyle);
         }
       }
     }
     // 设置列宽
    for (int i = 1; i < alias.length; i++)
       sheet.autoSizeColumn(i);
     // 处理中文不能自动调整列宽的问题
this.setSizeColumn(sheet, alias.length);
   }
   fileOutput.flush();
   workbook.write(fileOutput);
   fileOutput.close();
 }

 // 自适应宽度(中文支持)
 private void setSizeColumn(XSSFSheet sheet, int size) {
   for (int columnNum = 0; columnNum < size; columnNum++) {
     int columnWidth = sheet.getColumnWidth(columnNum) / 256;
     for (int rowNum = 0; rowNum <= sheet.getLastRowNum(); rowNum++) {
       XSSFRow currentRow;
       //当前行未被使用过
       if (sheet.getRow(rowNum) == null) {
         currentRow = sheet.createRow(rowNum);
       } else {
         currentRow = sheet.getRow(rowNum);
       }
       if (currentRow.getCell(columnNum) != null) {
         XSSFCell currentCell = currentRow.getCell(columnNum);
         if (currentCell.getCellType() == XSSFCell.CELL_TYPE_STRING) {
           int length = currentCell.getStringCellValue().getBytes().length;
           if (columnWidth < length) columnWidth = length;
         }
       }
     }
     columnWidth = columnWidth * 256 ;
     sheet.setColumnWidth(columnNum, columnWidth >= 65280 ? 6000 : columnWidth);
   }
 }

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