java实现图片角度旋转并获得图片信息

本文实例为大家分享了java实现图片角度旋转并获得图片信息的具体代码，供大家参考，具体内容如下

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>

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