java实现图片角度旋转并获得图片信息

 public class Demo { /** * 调整图片角度 * make by dongxh 2017年11月1日下午3:51:08 * @param src * @param angel * @return */ 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; } /** * 计算旋转参数 * make by dongxh 2017年11月1日下午3:51:29 * @param src * @param angel * @return */ 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)); } /** * 获得图片调整角度 * make by dongxh 2017年11月1日下午3:40:20 * @param imgFile * @return */ public static Integer getImgRotateAngle(String imgFile){ Integer angel = 0; Metadata metadata = null; try{ if(StringUtils.isBlank(imgFile))return angel; File _img_file_ = new File(imgFile); if(!_img_file_.exists())return angel; metadata = JpegMetadataReader.readMetadata(_img_file_); Directory directory = metadata.getDirectory(ExifDirectory.class); if(directory != null && directory.containsTag(ExifDirectory.TAG_ORIENTATION)){ int orientation = directory.getInt(ExifDirectory.TAG_ORIENTATION); // 原图片的方向信息 if(6 == orientation ){ //6旋转90 angel = 90; }else if( 3 == orientation){ //3旋转180 angel = 180; }else if( 8 == orientation){ //8旋转90 angel = 270; } } }catch(Exception e){ e.printStackTrace(); } return angel; } /** * 调整图片角度 * make by dongxh 2017年11月1日下午4:31:20 * @param imgFile */ public static void rotateImage(String imgFile){ try { if(StringUtils.isBlank(imgFile)){ File _img_file_ = new File(imgFile); if(_img_file_.exists()){ Integer angel = getImgRotateAngle(imgFile); if(angel==0)return; BufferedImage src = ImageIO.read(_img_file_); BufferedImage des = rotate(src, angel); ImageIO.write(des,"jpg", _img_file_); } } } catch (IOException e) { e.printStackTrace(); } } public static void main(String[] args)throws Exception{ String fromPic = "d://88888//IMG_20171004_122718.jpg-600"; //rotateImage(file); Integer angel = getImgRotateAngle(fromPic); System.out.println(angel); Thumbnails.of(fromPic) .rotate(angel) .scale(0.2f) .outputFormat("jpg") .outputQuality(0.2f) .toFile(fromPic); System.out.println("==End=="); } } 

  com.drewnoakesmetadata-extractor2.4.0-beta-1