带图片Excel导出工具类（包含easypoi的简单使用），图片使用Thumbnails压缩，jsoup对富文本内容解析

通过此代码可以实现，对富文本内容进行解析，对Excel中包含多张图片导出，可以对图片进行自定义压缩，导出多样性

Excel带图片导出

业务场景:前端用户提问发帖，在运营平台管理系统中对问题进行回复，只有回答过的帖子，才在前端进行展示。
后台要求导出用户前端提问帖。前端用户发帖数据为富文本内容，这里使用jsoup进行HTML代码解析。
之前没有图片的Excel导出一直使用easypoi进行处理，easypoi也可以对本地图片或图片byte[]进行导出，但是不支持多张图片，压缩图片不能控制。这里使用自己处理的方式。

这个工具类包含网络图片及本地图片导出，创建workbook等等。

public class ExcelUtilsNew {

	private static final String FILE_ROOT_PATH = "/mnt/ymt_bonjour_file";
	private static final String IMAGES_TEMP = "/temp/";

	/**
	 * 导出Excel
	 *
	 * @param sheetName sheet名称
	 * @param title     标题
	 * @param values    内容
	 * @param wb        HSSFWorkbook对象
	 * @return
	 */
	public static HSSFWorkbook getHSSFWorkbook(String sheetName, String[] title, String[][] values, HSSFWorkbook wb) {

		// 第一步，创建一个HSSFWorkbook，对应一个Excel文件
		if (wb == null) {
			wb = new HSSFWorkbook();
		}

		// 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet
		HSSFSheet sheet = wb.createSheet(sheetName);

		// 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
		HSSFRow row = sheet.createRow(0);

		// 第四步，创建单元格，并设置值表头 设置表头居中
		HSSFCellStyle style = wb.createCellStyle();
		style.setAlignment(HorizontalAlignment.CENTER);

		//声明列对象
		HSSFCell cell = null;

		//创建标题
		for (int i = 0; i < title.length; i++) {
			cell = row.createCell(i);
			cell.setCellValue(title[i]);
			cell.setCellStyle(style);
		}

		//创建内容
		for (int i = 0; i < values.length; i++) {
			row = sheet.createRow(i + 1);
			for (int j = 0; j < values[i].length; j++) {
				//将内容按顺序赋给对应的列对象
				row.createCell(j).setCellValue(values[i][j]);
			}
		}
		return wb;
	}

	// 主要使用这个创建XSSFWorkbook 对象，list为Excel的数据，titles为列名与list中的key的对应关系。
	public static XSSFWorkbook createWB(List> list, Map titles) {
		XSSFWorkbook wb = new XSSFWorkbook();
		XSSFSheet sheet = wb.createSheet();
		CellStyle style = wb.createCellStyle();
		style.setAlignment(HorizontalAlignment.CENTER);
		style.setVerticalAlignment(VerticalAlignment.CENTER);
		int rowNum = 0;
		XSSFRow row = sheet.createRow(rowNum++);
		Cell cell = null;

		// 遍历设置表头
		Collection values = titles.values();
		List list1;
		if (values instanceof List) {
			list1 = (List) values;
		} else {
			list1 = new ArrayList(values);
		}

		for (int i = 0; i < list1.size(); i++) {
			sheet.setDefaultColumnStyle(i, style);
			cell = row.createCell(i);
			cell.setCellValue(list1.get(i));
		}

		// 每一行的内容
		for (Map map : list) {
			int colNum = 0;
			row = sheet.createRow(rowNum++);
			List list2 = new ArrayList(titles.keySet());
			for (String s : list2) {
				cell = row.createCell(colNum++);
				Object o = map.get(s);
				cell.setCellValue(o == null ? "" : o.toString());
			}
		}
		return wb;
	}


	/**
	 * 批量插入网络图片到excel
	 *
	 * @param wb            待处理的ExcelWorkbook
	 * @param rowIndex      行
	 * @param colstartIndex 列
	 * @param scale         压缩比例
	 * @param quality       压缩质量
	 * @param imageUrls     待处理图片URL
	 * @throws Exception
	 */
	public static void inserNetImages(XSSFWorkbook wb, int rowIndex, int colstartIndex, float scale, float quality, List imageUrls) throws Exception {
		HttpURLConnection conn = null;
		XSSFSheet sheet = wb.getSheetAt(0);
		XSSFDrawing patriarch = sheet.createDrawingPatriarch();

		for (String imageUrl : imageUrls) {
			URL url = new URL(imageUrl);
			//打开链接
			conn = (HttpURLConnection) url.openConnection();
			//设置请求方式为"GET"
			conn.setRequestMethod("GET");
			//超时响应时间为50秒
			conn.setConnectTimeout(50 * 1000);
			//通过输入流获取图片数据
			InputStream inStream = conn.getInputStream();
			//得到图片的二进制数据，以二进制封装得到数据，具有通用性 (压缩)
			byte[] byteData = readInputStream(inStream, scale, quality);
			XSSFClientAnchor anchor =
					new XSSFClientAnchor(0, 0, 0, 0,
							(short) colstartIndex, rowIndex, (short) colstartIndex + 1,
							rowIndex + 1);
			//设置图片随单元移动调整大小
			anchor.setAnchorType(ClientAnchor.AnchorType.MOVE_AND_RESIZE);
			patriarch.createPicture(anchor, wb.addPicture(byteData, XSSFWorkbook.PICTURE_TYPE_JPEG));
		}
	}

	/**
	 * 批量插入本地图片到excel
	 *
	 * @param wb
	 * @param rowIndex
	 * @param colstartIndex
	 * @param scale
	 * @param quality
	 * @param imagePathList
	 */
	public static void insertLocalImages(XSSFWorkbook wb, int rowIndex, int colstartIndex, float scale, float quality, List imagePathList) throws Exception {

		XSSFSheet sheet = wb.getSheetAt(0);
		XSSFDrawing patriarch = sheet.createDrawingPatriarch();

		for (String filePath : imagePathList) {
			File file = new File(FILE_ROOT_PATH + filePath);
			if (!file.exists()) {
				break;
			}
			//通过输入流获取图片数据
			InputStream inStream = new FileInputStream(file);
			//得到图片的二进制数据，以二进制封装得到数据，具有通用性 (压缩)
			byte[] byteData = readInputStream(inStream, scale, quality);
			System.out.println("图片大小:" + byteData.length / 1024 / 1024);
			XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, (short) colstartIndex, rowIndex, (short) colstartIndex + 1, rowIndex + 1);
			anchor.setAnchorType(ClientAnchor.AnchorType.MOVE_AND_RESIZE);//设置图片随单元移动调整大小
			patriarch.createPicture(anchor, wb.addPicture(byteData, XSSFWorkbook.PICTURE_TYPE_JPEG));
			colstartIndex++;
		}
	}

	private static byte[] readInputStream(InputStream inStream, float scale, float quality) throws Exception {
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		File temp_dir = new File(FILE_ROOT_PATH + IMAGES_TEMP);
		if (!temp_dir.exists()) {
			temp_dir.mkdirs();
		}
		String tempFileName = System.currentTimeMillis() + ".jpg";

		File image_temp = new File(temp_dir, tempFileName);
		if (!image_temp.exists()) {
			image_temp.createNewFile();
		}
		//压缩图片到临时文件
		Thumbnails.of(inStream)
				.scale(scale)
				.outputQuality(quality)
				.toFile(image_temp);

		FileInputStream is = new FileInputStream(image_temp);

		//创建一个Buffer字符串
		byte[] buffer = new byte[1024];
		//每次读取的字符串长度，如果为-1，代表全部读取完毕
		int len = 0;
		//使用一个输入流从buffer里把数据读取出来
		while ((len = is.read(buffer)) != -1) {
			//用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
			outStream.write(buffer, 0, len);
		}
		//关闭输入流
		inStream.close();
		is.close();
		//把outStream里的数据写入内存
		return outStream.toByteArray();
	}

	public static void deleteTempFiles() {
		File file = new File(FILE_ROOT_PATH + IMAGES_TEMP);
		deleteFile(file);
	}

	/**
	 * 删除临时文件
	 */
	private static void deleteFile(File file) {
		// 判断传递进来的是文件还是文件夹,如果是文件,直接删除,如果是文件夹,则判断文件夹里面有没有东西
		if (file.isDirectory()) {
			// 如果是目录,就删除目录下所有的文件和文件夹
			File[] files = file.listFiles();
			// 遍历目录下的文件和文件夹
			for (File f : files) {
				// 如果是文件,就删除
				if (f.isFile()) {
					System.out.println("已经被删除的文件:" + f);
					// 删除文件
					f.delete();
				} else if (file.isDirectory()) {
					// 如果是文件夹,就递归调用文件夹的方法
					deleteFile(f);
				}
			}
			// 删除文件夹自己,如果它低下是空的,就会被删除
			System.out.println("已经被删除的文件夹:" + file);
			file.delete();
		}

		// 如果是文件,就直接删除自己
		System.out.println("已经被删除的文件:" + file);
		file.delete();
	}

	/**
	 * 自适应宽度(中文支持)
	 *
	 * @param sheet
	 * @param size
	 */
	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;
						}
					}
				}
			}
			sheet.setColumnWidth(columnNum, columnWidth * 256);
		}
	}
}

其中使用jsoup解析HTML代码，及使用hutool的DFA单词树（以下简称单词树）WordTree 对可能出现的img标签进行匹配（并不是每个用户提问都是带图片），匹配到在进行解析富文本内容。

final val baseOutDTO = exclusiveConsultantBbsList(params);
		if (ObjectUtil.isNotNull(baseOutDTO.getData())) {
			page = baseOutDTO.getData().getList();

			final WordTree wordTree = new WordTree();
			for (BbsPageOutDTO pageOutDTO : page) {
				//将HTML标签解析，将
标签和标签分离开，单独插入表格中
				Document document = Jsoup.parseBodyFragment(pageOutDTO.getBbsContent());
				//
标签里面的文字
				String textP = document.selectFirst("p").text();
				pageOutDTO.setBbsContentText(textP);

				wordTree.addWords("img");
				//img的图片
				if (wordTree.isMatch(pageOutDTO.getBbsContent())) {
					List imgSrcs = new ArrayList();
					Elements elements = document.getElementsByTag("img");
					for (Element element : elements) {
						String imgSrc = element.attr("src");
						imgSrcs.add(imgSrc);
					}
					pageOutDTO.setBbsContentImg(imgSrcs);
				}
				final ExclusiveOutDTO exclusiveOutDTO = new ExclusiveOutDTO();
				BeanUtil.copyProperties(pageOutDTO, exclusiveOutDTO);
				mapList.add(BeanUtil.beanToMap(exclusiveOutDTO));
			}
			return R.ok();
		} else {
			return R.error();
		}

在controller中实际导出代码

public void exportExcel(HttpServletResponse response) throws Exception {
//		Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(), ExclusiveOutDTO.class, page);

		// Excel的表头与导出实体类的字段做映射
		HashMap stringHashMap = new HashMap<>(12);
		stringHashMap.put("bbsAuthorId", "用户aid");
		stringHashMap.put("releaseTime", "提问发帖时间");
		stringHashMap.put("bbsSubject", "帖子主题");
		stringHashMap.put("bbsContentText", "提问内容");
		stringHashMap.put("bbsContentImg", "提问图片");
		stringHashMap.put("commentTime", "回复时间");
		stringHashMap.put("commentContent", "回复内容");
		stringHashMap.put("answerUser", "回复人");

		XSSFWorkbook workbook = ExcelUtilsNew.createWB(mapList, stringHashMap);

		for (int i = 0; i < page.size(); i++) {
			if (CollUtil.isNotEmpty(page.get(i).getBbsContentImg())) {
				ExcelUtilsNew.inserNetImages(workbook, i + 1, 1, 0.6f, 0.5f, page.get(i).getBbsContentImg());
			}
		}
		// 清空压缩的临时文件
		ExcelUtilsNew.deleteTempFiles();
		// 调用response对象下载Excel
	}

使用easypoi的示例，适用于单张图片

这里是easypoi的官方文档地址easypoi的官方文档
我的项目中使用easypoi的实体类示例

@Data
public class ExclusiveOutDTO implements Serializable {

	private static final long serialVersionUID = -1782708760205108787L;

	/**
	 * 作者ID
	 */
	@Excel(name = "用户aid", width = 30)
	private String bbsAuthorId;

	/**
	 * 发布时间
	 */
	@Excel(name = "提问发帖时间", width = 30)
	private String releaseTime;

	/**
	 * 帖子主题
	 */
	@Excel(name = "帖子主题", width = 30)
	private String bbsSubject;

	/**
	 * 提问内容
	 */
//	@Excel(name = "提问全量内容", width = 30)
	private String bbsContent;

	/**
	 * 提问内容
	 */
	@Excel(name = "提问内容", width = 30)
	private String bbsContentText;

	/**
	 * 提问内容
	 */
//	@Excel(name = "提问图片", width = 30)
	private List bbsContentImg;

	/**
	 * 回复时间
	 */
	@Excel(name = "回复时间", width = 30)
	private String commentTime;

	/**
	 * 回复内容
	 */
	@Excel(name = "回复内容", width = 30)
	private String commentContent;

	/**
	 * 回复人
	 */
	@Excel(name = "回复人", width = 30)
	private String answerUser;
}

附带Maven的地址

 
            cn.afterturn
            easypoi-base
            3.2.0
        
        
            cn.afterturn
            easypoi-web
            3.2.0
        
        
            cn.afterturn
            easypoi-annotation
            3.2.0
        
        
 
            net.coobird
            thumbnailator
            0.4.8
        

        
            org.jsoup
            jsoup
            1.11.3
        
        
            org.apache.commons
            commons-collections4
            4.1
        

本项目中对easypoi的工具类

public class FileUtil {

	public static void uploadFile(byte[] file, String filePath, String fileName) throws Exception {
		File targetFile = new File(filePath);
		if (!targetFile.exists()) {
			targetFile.mkdirs();
		}
		FileOutputStream out = new FileOutputStream(filePath + fileName);
		out.write(file);
		out.flush();
		out.close();
	}

	public static boolean deleteFile(String fileName) {
		File file = new File(fileName);
		// 如果文件路径所对应的文件存在，并且是一个文件，则直接删除
		if (file.exists() && file.isFile()) {
			if (file.delete()) {
				return true;
			} else {
				return false;
			}
		} else {
			return false;
		}
	}

	public static String renameToUUID(String fileName) {
		return UUID.randomUUID() + "." + fileName.substring(fileName.lastIndexOf(".") + 1);
	}

	public static void exportExcel(List list, String title, String sheetName, Class pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response){
		ExportParams exportParams = new ExportParams(title, sheetName);
		exportParams.setCreateHeadRows(isCreateHeader);
		defaultExport(list, pojoClass, fileName, response, exportParams);

	}

	/**
	 * 项目中默认使用这个作为Excel导出
	 *
	 * @param list
	 * @param pojoClass
	 * @param fileName
	 * @param response
	 */
	public static void exportExcel(List list, Class pojoClass, String fileName, HttpServletResponse response) {
		defaultExport(list, pojoClass, fileName, response, new ExportParams());
	}

	public static void exportExcel(List list, String title, String sheetName, Class pojoClass,String fileName, HttpServletResponse response){
		defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
	}
	public static void exportExcel(List> list, String fileName, HttpServletResponse response){
		defaultExport(list, fileName, response);
	}
	private static void defaultExport(List list, Class pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {
		Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
		if (workbook != null) {
			downLoadExcel(fileName, response, workbook);
		}
	}

	public static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
		try {
			response.setCharacterEncoding("UTF-8");
			response.setHeader("content-Type", "application/vnd.ms-excel");
			response.setHeader("Content-Disposition",
					"attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
			workbook.write(response.getOutputStream());
		} catch (IOException e) {
			throw new RuntimeException(e.getMessage());
		}
	}
	private static void defaultExport(List> list, String fileName, HttpServletResponse response) {
		Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
		if (workbook != null);
		downLoadExcel(fileName, response, workbook);
	}
	public static  List importExcel(String filePath,Integer titleRows,Integer headerRows, Class pojoClass){
		if (StringUtils.isBlank(filePath)){
			return null;
		}
		ImportParams params = new ImportParams();
		params.setTitleRows(titleRows);
		params.setHeadRows(headerRows);
		List list = null;
		try {
			list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
		}catch (NoSuchElementException e){
			throw new RuntimeException("模板不能为空");
		} catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException(e.getMessage());
		}
		return list;
	}
	public static  List importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class pojoClass){
		if (file == null){
			return null;
		}
		ImportParams params = new ImportParams();
		params.setTitleRows(titleRows);
		params.setHeadRows(headerRows);
		List list = null;
		try {
			list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
		}catch (NoSuchElementException e){
			throw new RuntimeException("excel文件不能为空");
		} catch (Exception e) {
			throw new RuntimeException(e.getMessage());
		}
		return list;
	}

}

希望可以帮助到有需求的小伙伴，共同进步！！！