[Java] 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";
 //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==");
 }
 
}

<dependency>
 <groupid>com.drewnoakes</groupid>
 <artifactid>metadata-extractor</artifactid>
 <version>2.4.0-beta-1</version>
</dependency>