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==");
}
}
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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