照片上传图片旋转（ios和android）

由于手机系统的问题，导致照片上传旋转90度，android前置旋转270度
接下来为大家解决这一问题
1，获取上传文件的源文件的元数据
2，根据元数据的获取Orientation
3，根据Orientation来旋转图片

2-----------------------------------------------------------

import java.io.File;
import java.util.Iterator;

import com.drew.imaging.jpeg.JpegMetadataReader;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;
import com.drew.metadata.exif.ExifDirectory;

/**
* 测试用于读取图片的EXIF信息
*
* @author Winter Lau
*/
public class ExifRead {
private static final Logger LOG = Logger.getLogger(ExifRead.class);

public static int getOrientation2(String str) throws Exception {
File jpegFile = new File(str);
Metadata metadata = JpegMetadataReader.readMetadata(jpegFile);
Directory exif = metadata.getDirectory(ExifDirectory.class);
// JpegDirectory jpegDirectory =
// (JpegDirectory)metadata.getDirectory(JpegDirectory.class);
int orientation = 0;
Iterator tags = exif.getTagIterator();
while (tags.hasNext()) {
Tag tag = (Tag) tags.next();
if ("Orientation".equalsIgnoreCase(tag.getTagName())) {
orientation = getOrientation(tag.getDescription());
break;
}
}

Integer turn = 360;
if (orientation == 0 || orientation == 1) {
turn = 360;
} else if (orientation == 3) {
turn = 180;
} else if (orientation == 6) {
turn = 90;
} else if (orientation == 8) {
turn = 270;
}
return turn;
}

public static int getOrientation(String orientation) {
int tag = 0;
if ("Top, left side (Horizontal / normal)".equalsIgnoreCase(orientation)) {
tag = 1;
} else if ("Top, right side (Mirror horizontal)".equalsIgnoreCase(orientation)) {
tag = 2;
} else if ("Bottom, right side (Rotate 180)".equalsIgnoreCase(orientation)) {
tag = 3;
} else if ("Bottom, left side (Mirror vertical)".equalsIgnoreCase(orientation)) {
tag = 4;
} else if ("Left side, top (Mirror horizontal and rotate 270 CW)".equalsIgnoreCase(orientation)) {
tag = 5;
} else if ("Right side, top (Rotate 90 CW)".equalsIgnoreCase(orientation)) {
tag = 6;
} else if ("Right side, bottom (Mirror horizontal and rotate 90 CW)".equalsIgnoreCase(orientation)) {
tag = 7;
} else if ("Left side, bottom (Rotate 270 CW)".equalsIgnoreCase(orientation)) {
tag = 8;
}
return tag;
}
}

3，----------------------------------------------------------
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class RotateImage {

public static void main(String[] args) throws IOException {
BufferedImage src = ImageIO.read(new File("E:/java/0.jpg"));
BufferedImage des = RotateImage.Rotate(src, 360);
ImageIO.write(des, "jpg", new File("E:/java/20.jpg"));
}

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;
}

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 java.awt.Rectangle(new Dimension(des_width, des_height));
}
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附上jar包，metadata-extractor-2.3.1 找不到QQ联系736057729

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