java Rotates Picture Angles and Gets Picture Information

This example shares the specific code of java to rotate the angle of the picture and get the picture information for your reference, which is as follows

public class Demo {
 
 /**
 *  Adjust Picture Angle 
 * make by dongxh 2017 year 11 month 1 Day afternoon 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; 
 }
 
 /**
 *  Calculate rotation parameters 
 * make by dongxh 2017 year 11 month 1 Day afternoon 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)); 
 } 
 
 /**
 *  Get Picture Adjustment Angle 
 * make by dongxh 2017 year 11 month 1 Day afternoon 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);
 //  Orientation information of the original picture  
    if(6 == orientation ){ 
     //6 rotate 90 
     angel = 90; 
    }else if( 3 == orientation){ 
    //3 rotate 180 
     angel = 180; 
    }else if( 8 == orientation){ 
    //8 rotate 90 
     angel = 270; 
    } 
 }
 }catch(Exception e){
 e.printStackTrace();
 }
 return angel;
 }
 
 /**
 *  Adjust Picture Angle 
 * make by dongxh 2017 year 11 month 1 Day afternoon 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==");
 }
 
} 

Get pictures using metadata-extractor

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