excel工具类

public class ExcelUtils {
	/**
	 * Excel导出设置Workbook
	 * @param title 导出Excel文件名称
	 * @param rowList 第一个List为表头，其余行为表数据
	 * @param downLoadPic 是否下载图片
	 * @throws IOException
	 */
	public static HSSFWorkbook warpSingleWorkbook(String title, List<List<Object>> rowList, Boolean downLoadPic,Integer pos) throws IOException {
		if (rowList == null || rowList.isEmpty()) {
			throw new NullPointerException("the row list is null");
		}
		HSSFWorkbook book = new HSSFWorkbook();
		// 创建表
		HSSFSheet sheet = book.createSheet(title);
		// 设置单元格默认宽度为20个字符
		sheet.setDefaultColumnWidth(20);
		HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
		// 设置表头样式
		HSSFCellStyle style = book.createCellStyle();
		// 设置居左
		style.setAlignment(HorizontalAlignment.LEFT);
		// 检测表头数据（表头不允许数据为空）
		List<Object> head = rowList.get(0);
		// 写数据
		int size = rowList.get(0).size();
		// 第几行
		for (int i = 0; i < rowList.size(); i++) {
			List<Object> row = rowList.get(i);
			if (row == null || row.isEmpty()) {
				book.close();
				throw new NullPointerException("the "+(i+1)+"th row is null");
			}
			if (size != row.size()) {
				book.close();
				throw new IllegalArgumentException("the cell number of "+(i+1)+"th row is different form the first");
			}
			HSSFRow sr = sheet.createRow(i);
			// 第几列
			for (int j = 0; j < row.size(); j++) {
				// 如果是否下载照片选择了true，由于我们的照片放在第三列，即当循环到序列为2的时候获取到网络图片地址，这里还考虑到了有多张照片的情况，且用逗号拼接成多张照片。
				if (downLoadPic && i > 0 && j == pos) {
					if(StringUtils.isNotBlank(row.get(j).toString())){
						sr.setHeight((short) (1800));
						row.forEach(System.out::println);
						List<String> images = Arrays.asList(row.get(j).toString().split(","));
						int temp = j;
						for(String image : images){
							// 调用封装好的下载图片方法
							drawPictureInfoExcel(book, patriarch, i, j, image);
							j++;
						}
					}
				} else {
					setExcelValue(sr.createCell(j), row.get(j), style);
				}
			}
		}
		return book;
	}

	/**
	 * 设置Excel浮点数可做金额等数据统计
	 * @param cell 单元格类
	 * @param value 传入的值
	 */
	public static void setExcelValue(HSSFCell cell, Object value, HSSFCellStyle style){
		// 写数据
		if (value == null) {
			cell.setCellValue("");
		}else {
			if (value instanceof Integer || value instanceof Long) {
				cell.setCellType(CellType.NUMERIC);
				cell.setCellValue(Long.valueOf(value.toString()));
			} else if (value instanceof BigDecimal) {
				cell.setCellType(CellType.NUMERIC);
				cell.setCellValue(((BigDecimal)value).setScale(3, RoundingMode.HALF_UP).doubleValue());
			} else {
				cell.setCellValue(value.toString());
			}
			cell.setCellStyle(style);
		}
	}

	/**
	 *
	 * @param wb
	 * @param patriarch
	 * @param rowIndex
	 * @param columnIndex
	 * @param pictureUrl
	 */
	private static void drawPictureInfoExcel(HSSFWorkbook wb,HSSFPatriarch patriarch,int rowIndex, int columnIndex,String pictureUrl){
		//rowIndex代表当前行
		try {
			URL url = new URL(pictureUrl);
			//打开链接
			HttpURLConnection conn = (HttpURLConnection)url.openConnection();
			//设置请求方式为"GET"
			conn.setRequestMethod("GET");
			//超时响应时间为5秒
			conn.setConnectTimeout(5 * 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
			byte[] data = readInputStream(inStream);
			//anchor主要用于设置图片的属性
			// dx1：起始单元格的x偏移量，
			// dy1：起始单元格的y偏移量，
			// dx2：终止单元格的x偏移量，
			// dy2：终止单元格的y偏移量，
			// col1：起始单元格列序号，从0开始计算；
			// row1：起始单元格行序号，从0开始计算，
			// col2：终止单元格列序号，从0开始计算；
			// row2：终止单元格行序号，从0开始计算，
			HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 250,(short) columnIndex, rowIndex, (short) columnIndex, rowIndex);
			//Sets the anchor type （图片在单元格的位置）
			//0 = Move and size with Cells, 2 = Move but don't size with cells, 3 = Don't move or size with cells.
			anchor.setAnchorType(ClientAnchor.AnchorType.DONT_MOVE_AND_RESIZE);
			patriarch.createPicture(anchor, wb.addPicture(data, HSSFWorkbook.PICTURE_TYPE_PNG));
		} catch (IOException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private static byte[] readInputStream(InputStream inStream) throws Exception{
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		//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=inStream.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();
		//把outStream里的数据写入内存
		return outStream.toByteArray();
	}


	public static SXSSFWorkbook getSxssfwbExcel(SXSSFWorkbook wb, SXSSFSheet sheet,String sheetTitle,Object[] title, List<List<String>> result) {
//		SXSSFWorkbook wb = new SXSSFWorkbook();
		//int sheetNum = 0;// 记录额外创建的sheet数量
		Sheet sheet = wb.createSheet(sheetTitle);
		// wb.setSheetName(sheetNum, sheetTitle+sheetNum);
		if (wb == null){
			wb = new SXSSFWorkbook(1000);
			sheet = wb.createSheet(sheetTitle);
		}
		int rownum = 0;
		Row row = sheet.createRow(rownum);
		Cell cell;
		// 创建标题,此时row=0,即第一行
		for (int j = 0; j < title.length; j++) {
			cell = row.createCell(j);
			cell.setCellValue(title[j].toString());
		}

		// 遍历集合数据，创建excel内容,产生数据行
		if (result != null) {
			int index = 1;
			List<String> m = null;
			for (int i = 0; i < result.size(); i++) {
				row = sheet.createRow(index);
				int cellIndex = 0;
				m = result.get(i);
				for (String str : m) {
					row.createCell((short) cellIndex).setCellValue(str);
					cellIndex++;
				}

				index++;
			}
		}


		return wb;
	}

	/**
	 * 获取Excel中的图片
	 * @param xssfSheet
	 * @return
	 */
	public static Map<String, XSSFPictureData> getPictures(XSSFSheet xssfSheet){

		Map<String,XSSFPictureData> map=new HashMap<>();
		List<XSSFShape> list=xssfSheet.getDrawingPatriarch().getShapes();

		for (XSSFShape shape:list){

			XSSFPicture picture = (XSSFPicture) shape;
			XSSFClientAnchor xssfClientAnchor=(XSSFClientAnchor) picture.getAnchor();
			XSSFPictureData pdata = picture.getPictureData();
			// 行号-列号
			String key = xssfClientAnchor.getRow1() + "-" + xssfClientAnchor.getCol1();
			map.put(key, pdata);

		}

		return map;
	}

	/**
	 * excel根据指定行列放入图片
	 */
	public static void toLeadPicture(SXSSFWorkbook workbook, SXSSFSheet sheet, String fileUrl, int row, int col, double scaleX, double scaleY) {
		try {
			//防止URL地址有中文，解码
			String head = fileUrl.substring(0, fileUrl.lastIndexOf("/")+1);
			String suffix = fileUrl.substring(fileUrl.lastIndexOf("/")+1);
			String link = head + URLEncoder.encode(suffix,"UTF-8");
			// 构造URL
			URL url = new URL(link);
			// 打开连接
			URLConnection con = url.openConnection();
			//设置请求超时为5s
			con.setConnectTimeout(8 * 1000);
			// 输入流
			InputStream is = con.getInputStream();
			byte[] bytes = IOUtils.toByteArray(is);
			//对图片进行压缩
			byte[] pic = PicUtils.compressPicForScale(bytes, 80L);
			@SuppressWarnings("static-access")
			int pictureIdx = workbook.addPicture(pic, workbook.PICTURE_TYPE_PNG);
			CreationHelper helper = workbook.getCreationHelper();
			Drawing drawing = sheet.createDrawingPatriarch();
			ClientAnchor anchor = helper.createClientAnchor();
			// 图片插入坐标
			anchor.setCol1(col);
			anchor.setRow1(row);
			// 插入图片
			Picture pict = drawing.createPicture(anchor, pictureIdx);
			pict.resize(scaleX, scaleY);
//			// 设置宽度
//			sheet.setColumnWidth(row, 10 * 256);
//			// 设置高度
//			Row rowl = sheet.createRow(col);
//			rowl.setHeight((short) (30 * 20));

		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}