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
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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==" ); }
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获得图片使用metadata-extractor
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<dependency> <groupid>com.drewnoakes</groupid> <artifactid>metadata-extractor</artifactid> <version> 2.4 . 0 -beta- 1 </version> </dependency> |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
原文链接：https://blog.csdn.net/fackyou200/article/details/78435709
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