版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/cocoaxian/article/details/85611067
package useractivity.utils;
import com.drew.imaging.ImageMetadataReader;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.exif.ExifDirectoryBase;
import org.apache.log4j.Logger;
import org.springframework.web.multipart.MultipartFile;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
/**
* @author leo
* @version 2018/11/28 11:01
* @Description 矫正手机拍摄图片方向问题
*/
public class RotateImage {
private static Logger logger = Logger.getLogger(RotateImage.class);
/**
* 调整手机上传的图片方向
*
* @param userHeadImage
* @param userHeadImage
* @return
*/
public static Map rotate(MultipartFile userHeadImage) {
Image src = null;
int angel = 0;
try {
src = ImageIO.read(userHeadImage.getInputStream());
File file = File.createTempFile("tmp", null);
userHeadImage.transferTo(file);
file.deleteOnExit();
angel = getRotateAngleForPhoto(file);
} catch (IOException e) {
e.printStackTrace();
}
Map<String, Object> result = new HashMap<>();
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);
ByteArrayOutputStream bs = new ByteArrayOutputStream();
try {
ImageOutputStream imOut = ImageIO.createImageOutputStream(bs);
//scaledImage1为BufferedImage,jpg为图像的类型
ImageIO.write(res, "jpg", imOut);
} catch (IOException e) {
e.printStackTrace();
}
logger.info("转换工具类中图片大小" + bs.size());
InputStream is = new ByteArrayInputStream(bs.toByteArray());
result.put("is", is);
result.put("size", bs.size());
return result;
}
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));
}
public static int getRotateAngleForPhoto(File file) {
int angle = 0;
Metadata metadata;
try {
metadata = ImageMetadataReader.readMetadata(file);
Directory directory = metadata.getFirstDirectoryOfType(ExifDirectoryBase.class);
if (directory.containsTag(ExifDirectoryBase.TAG_ORIENTATION)) {
// Exif信息中方向
int orientation = directory.getInt(ExifDirectoryBase.TAG_ORIENTATION);
// 原图片的方向信息
if (6 == orientation) {
//6旋转90
angle = 90;
} else if (3 == orientation) {
//3旋转180
angle = 180;
} else if (8 == orientation) {
//8旋转90
angle = 270;
}
}
} catch (Exception e) {
e.printStackTrace();
}
return angle;
}
}