java 图片角度调整旋转、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";//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==");}}

获得图片使用metadata-extractor

<dependency>    <groupId>com.drewnoakes</groupId>    <artifactId>metadata-extractor</artifactId>    <version>2.4.0-beta-1</version></dependency>