针对iphone手机拍照片旋转90度问题解决

/*
	1、图片上传的方法
*/
@RequestMapping(value = "/uploadPic", method = RequestMethod.POST)
    @ResponseBody
    public JsonResult upload(@RequestParam("file") MultipartFile[] files){
		Boolean flag = false;
		String[] picArray = {".jpg",".png",".jpeg"};
		JSONArray jsonArray = new JSONArray();
		if (files != null && files.length > 0) {
			for(MultipartFile multipartFile : files){
		        if (multipartFile == null || multipartFile.isEmpty()) {
		        	return new JsonResult(false, "文件不存在");
		        }
		        
		        String originalFilename = multipartFile.getOriginalFilename();
		        for (String suffix : picArray) {
					if(StringUtils.endsWithIgnoreCase(originalFilename, suffix)){
						flag = true;
					}
				}
		        
		        if(!flag){
		        	return new JsonResult(false, "图片格式不正确，图片只支持jpg,png,jpeg");
		        }
		        
		        String extName = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
		
		        String urlString = "";
				try {
					/*
						图片上传服务器之前先对旋转的图片进行做修正
					*/
					byte[] picBytes = rotatePic(multipartFile, extName);
					//图片上传服务器
					urlString = dfsService.upload(picBytes, extName);
					if (null != urlString && urlString.startsWith("HTTP Status ")) {
						urlString = "";
					}
					
					jsonArray.add(getJsonObject(urlString, (urlString == "" ? urlString : ImgUtils.choiceImgUrl("800X600", urlString))));
					
				} catch (IOException e) {
					e.printStackTrace();
					LOGGER.error("图片上传失败",e);
					return new JsonResult(false, "图片上传失败");
				}
			}
		}
		return new JsonResult(true, jsonArray);
    }
    

/*
	2、判断图片的是否旋转
*/

private byte[] rotatePic(MultipartFile multipartFile, String extName) throws IOException{
		ByteArrayOutputStream bos;
		try {
			int orientation=0;
			int angle = 0;
			Metadata metadata = JpegMetadataReader.readMetadata(multipartFile.getInputStream());
			for (Directory dir : metadata.getDirectories()) {
				if (dir != null && dir.containsTag(ExifDirectoryBase.TAG_ORIENTATION)) {
					orientation = dir.getInt(ExifDirectoryBase.TAG_ORIENTATION);
					break;
				}
			}
			switch (orientation) {
			case 6:
				angle = 90;
				break;
			case 3:
				angle = 180;
				break;
			case 8:
				angle = 270;
				break;
			default:
				break;
			}
			BufferedImage img = ImageIO.read(multipartFile.getInputStream());
			if(angle != 0){
				//处理旋转的图片
				img = RotateImage.Rotate(img, angle);
			}
			bos = new ByteArrayOutputStream();  

			//使用流修改图片
			ImageIO.write(img, extName, bos);
			//返回新的图片数组
			return bos.toByteArray();
		} catch (JpegProcessingException e) {
			return multipartFile.getBytes();
		} catch (MetadataException e) {
			return multipartFile.getBytes();
		} catch (IOException e) {
			return multipartFile.getBytes();
		}
	}
	
/*
	3、修正图片的具体工具类（方法）
*/

public class RotateImage {
	public static BufferedImage Rotate(Image src, int angel) {
		int src_width = src.getWidth(null);
		int src_height = src.getHeight(null);
		// calculate the new image size
		Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(src_width, src_height)), angel);

		BufferedImage res = null;
		res = new BufferedImage(rect_des.width, rect_des.height, BufferedImage.TYPE_INT_RGB);
		Graphics2D g2 = res.createGraphics();
		// transform
		g2.translate((rect_des.width - src_width) / 2, (rect_des.height - src_height) / 2);
		g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);

		g2.drawImage(src, null, null);
		return res;
	}

	public static Rectangle CalcRotatedSize(Rectangle src, int angel) {
		// if angel is greater than 90 degree, we need to do some conversion
		if (angel >= 90) {
			if (angel / 90 % 2 == 1) {
				int temp = src.height;
				src.height = src.width;
				src.width = temp;
			}
			angel = angel % 90;
		}

		double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
		double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
		double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
		double angel_dalta_width = Math.atan((double) src.height / src.width);
		double angel_dalta_height = Math.atan((double) src.width / src.height);

		int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha - angel_dalta_width));
		int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha - angel_dalta_height));
		int des_width = src.width + len_dalta_width * 2;
		int des_height = src.height + len_dalta_height * 2;
		return new Rectangle(new Dimension(des_width, des_height));
	}
}

/*
	4、依赖

	<dependency>
	    <groupId>com.drewnoakes</groupId>
	    <artifactId>metadata-extractor</artifactId>
	    <version>2.8.1</version>
	</dependency>
	
*/