http://blog.csdn.net/ghsau/article/details/8472486
翻转后 orientation 属性为6 。
public static void main(String[] args) throws ImageProcessingException, IOException { File jpegFile= new File("C:\\Users\\Administrator\\Desktop\\IMG_0362.JPG"); Metadata metadata = ImageMetadataReader.readMetadata(jpegFile); Directory directory = metadata.getDirectory(ExifIFD0Directory.class); JpegDirectory jpegDirectory = (JpegDirectory)metadata.getDirectory(JpegDirectory.class); // int orientation =0; // Metadata metadata = JpegMetadataReader.readMetadata(newFile); // for (Directory directory : metadata.getDirectories()) // { // for (Tag tag : directory.getTags()) // { // if ("Orientation".equalsIgnoreCase(tag.getTagName())) // { // orientation=getOrientation(tag.getDescription()); // } // } // } // 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; // } int orientation = 1; try { orientation = directory.getInt(ExifIFD0Directory.TAG_ORIENTATION); } catch (MetadataException me) { logger.warn("Could not get orientation"); } System.out.println(orientation); BufferedImage src = ImageIO.read(jpegFile); BufferedImage des = RotateImage.Rotate(src, 90); ImageIO.write(des,"jpg", new File("C:\\Users\\Administrator\\Desktop\\IMG_0362.JPG")); // FileInputStream fip = new FileInputStream(jpegFile); // LLJTran llj = new LLJTran(fip); // try { // llj.read(LLJTran.READ_INFO, true); // } catch (LLJTranException e) { // e.printStackTrace(); // } // // Exif exif = (Exif) llj.getImageInfo(); // Entry e = new Entry(Exif.RATIONAL); // exif.setTagValue(Exif.ORIENTATION_TOPLEFT,1,e,true); // llj.refreshAppx(); // Recreate Marker Data for changes done // //改写后的文件,文件必须存在 // OutputStream out = new BufferedOutputStream(new FileOutputStream("C:\\Users\\Administrator\\Desktop\\IMG_0362.JPG")); // // Transfer remaining of image to output with new header. // try { // llj.xferInfo(null, out, LLJTran.REPLACE, LLJTran.REPLACE); // } catch (LLJTranException e1) { // e1.printStackTrace(); // } // fip.close(); // out.close(); // llj.freeMemory(); } 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; }
翻转:
package com.xxxx.xxx.xxx.xxx; import java.awt.*; import java.awt.image.BufferedImage; /** * Created by Administrator on 2015/12/15. */ public class RotateImage { 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 Rectangle(new Dimension(des_width, des_height)); } }