<dependency>
<groupId>com.drewnoakes</groupId>
<artifactId>metadata-extractor</artifactId>
<version>2.11.0</version>
</dependency>
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import com.drew.imaging.jpeg.JpegMetadataReader;
import com.drew.imaging.jpeg.JpegProcessingException;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.MetadataException;
import com.drew.metadata.exif.ExifDirectoryBase;
public class Demo {
// 处理ios图片旋转的问题
public static void getPictureByName(String filePath,String name){
try {
//name为前端请求图片名，如 a.jpg
BufferedImage src = getPicture(filePath+name);
BufferedImage bi = null;
//图片存在
if(src != null){
//获取图片旋转角度
int angel = getRotateAngleForPhoto(filePath+name);
//图片被翻转，调整图片
if(angel != 0){
int src_width = src.getWidth(null);
int src_height = src.getHeight(null);
Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(src_width, src_height)), angel);
bi = new BufferedImage(rect_des.width, rect_des.height,BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bi.createGraphics();
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);
int index = name.lastIndexOf(".");
String formate = name.substring(index+1);
ImageIO.write(bi, formate, new File(filePath+name));
}
}else{
//图片不存在
System.out.println("图片不存在");
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 读取指定图片
*/
public static BufferedImage getPicture(String path) {
BufferedImage bi = null;
try{
File file = new File(path);
if(!file.exists()){
return null;
}
bi = ImageIO.read(file);
} catch (Exception e){
e.printStackTrace();
}
return bi;
}
/**
* 图片翻转时，计算图片翻转到正常显示需旋转角度
*/
public static int getRotateAngleForPhoto(String fileName){
File file = new File(fileName);
int angel = 0;
Metadata metadata;
try{
metadata = JpegMetadataReader.readMetadata(file);
Directory directory = metadata.getFirstDirectoryOfType(ExifDirectoryBase.class);
if(directory != null && 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
angel = 90;
}else if( 3 == orientation){
//3旋转180
angel = 180;
}else if( 8 == orientation){
//8旋转90
angel = 270;
}
}
} catch(JpegProcessingException e){
e.printStackTrace();
} catch(MetadataException e){
e.printStackTrace();
} catch(Exception e){
e.printStackTrace();
}
System.out.println("图片旋转角度：" + angel);
return angel;
}
/**
* 计算旋转参数
*/
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 / 9%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 java.awt.Rectangle(new Dimension(des_width, des_height));
}
public static void main(String[] args) throws Exception {
String filePath ="d:/" ;
String filename = "333.jpg";
//处理ios图片旋转的问题
getPictureByName(filePath,filename);
}
}