java 旋转图片

package test; import java.awt.Dimension; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.nio.channels.FileChannel; import java.util.Iterator; import org.apache.log4j.Logger; import com.drew.imaging.ImageMetadataReader; import com.drew.metadata.Directory; import com.drew.metadata.Metadata; import com.drew.metadata.exif.ExifIFD0Directory; import com.sun.image.codec.jpeg.ImageFormatException; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGEncodeParam; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class Test { private static Logger logger = Logger.getLogger(Test.class); public static void main(String args[]) { String src = "d:/2.jpg"; //获取图片旋转角度 int angel = getRotateAngleForPhoto(src); if (angel>0) { rotateImage(new File(src), angel); } } /** * 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; InputStream is = null; try { is = new FileInputStream(file); } catch (FileNotFoundException e1) { e1.printStackTrace(); } try{ //核心对象操作对象 Metadata metadata = ImageMetadataReader.readMetadata(is); //获取所有不同类型的Directory，如ExifSubIFDDirectory, ExifInteropDirectory, ExifThumbnailDirectory等，这些类均为ExifDirectoryBase extends Directory子类 //分别遍历每一个Directory，根据Directory的Tags就可以读取到相应的信息 int orientation = 0; Iterable<Directory> iterable = metadata.getDirectories(); for (Iterator<Directory> iter = iterable.iterator();iter.hasNext();) { Directory dr = iter.next(); if (dr.getString(ExifIFD0Directory.TAG_ORIENTATION)!=null) { orientation = dr.getInt(ExifIFD0Directory.TAG_ORIENTATION); } logger.debug("orientation=="+orientation); /*Collection<Tag> tags = dr.getTags(); for (Tag tag : tags) { System.out.println(tag.getTagName() + "： " + tag.getDescription()); }*/ } if(orientation==0||orientation==1) { angel=360; } else if(orientation==3) { angel=180; } else if(orientation==6) { angel=90; } else if(orientation==8) { angel=270; } } catch(Exception e){ e.printStackTrace(); } logger.info("图片旋转角度：" + angel); return angel; } /** * 旋转图片为指定角度 * * @param bufferedimage * 目标图像 * @param degree * 旋转角度 * @return */ public static File rotateImage(File file, final int angel) { BufferedImage src = InputImage(file.getPath()); BufferedImage bi = null; /*int w = bufferedimage.getWidth(); int h = bufferedimage.getHeight(); int type = bufferedimage.getColorModel().getTransparency(); BufferedImage img; Graphics2D graphics2d; (graphics2d = (img = new BufferedImage(w, h, type)) .createGraphics()).setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); graphics2d.rotate(Math.toRadians(degree), w * 0.99, h * 0.99); graphics2d.drawImage(bufferedimage, 0, 0, null); graphics2d.dispose();*/ 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); // 调用方法输出图片文件 OutImage(file.getPath(), bi, (float)0.5); return file; } /** * 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)); } /** * * 将图片文件输出到指定的路径，并可设定压缩质量 * * @param outImgPath * @param newImg * @param per */ private static void OutImage(String outImgPath, BufferedImage newImg, float per) { // 判断输出的文件夹路径是否存在，不存在则创建 File file = new File(outImgPath); if (!file.getParentFile().exists()) { file.getParentFile().mkdirs(); }// 输出到文件流 FileChannel fc= null; try { FileOutputStream newimage = new FileOutputStream(outImgPath); //获取图片大小 fc= newimage.getChannel(); logger.info("图片大小："+fc.size()/1024/1024+"M"); if (fc.size()>1*1024*1024) {//1M per = (float) (1*1024*1024.00/fc.size()*0.5); } JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage); JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(newImg); // 压缩质量 jep.setQuality(per, true); encoder.encode(newImg, jep); newimage.close(); } catch (FileNotFoundException e) { logger.error(e); // TODO Auto-generated catch blocke.printStackTrace(); } catch (ImageFormatException e) { logger.error(e); // TODO Auto-generated catch blocke.printStackTrace(); } catch (IOException e) { logger.error(e); // TODO Auto-generated catch blocke.printStackTrace(); } } /** * * 图片文件读取 * * @param srcImgPath * @return */ public static BufferedImage InputImage(String srcImgPath) { //logger.debug(srcImgPath); BufferedImage srcImage = null; File file = new File(srcImgPath); try { // 构造BufferedImage对象 FileInputStream in = new FileInputStream(file); byte[] b = new byte[5]; in.read(b); srcImage = javax.imageio.ImageIO.read(file); } catch (IOException e) { System.out.println("读取图片文件出错！" + e.getMessage()); e.printStackTrace(); } return srcImage; } }


附件下载（附metadata-extractor-2.8.1.jar，xmpcore-5.1.2.jar）