java实现图片角度旋转并获得图片信息

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))retursrpmfbgxhn 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

com.drewnoakes

metadata-extractor

2.4.0-beta-1

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