java生成高清缩略图不丢真，java压缩图片

package com.img; /** * ImageCompress 提供用户将大图片按比例压缩为小图片，支持JPG、PNG，随便改改就能自己用了，绝对的高清 * Please refer to: <BR> * <P> * @author feng_francis <1151461406@qq.com> * @see java.awt.image.BufferedImage **/ import java.awt.BorderLayout; import java.awt.Button; import java.awt.Color; import java.awt.Dimension; import java.awt.FileDialog; import java.awt.Font; import java.awt.Frame; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Insets; import java.awt.Label; import java.awt.MediaTracker; import java.awt.Panel; import java.awt.TextField; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.image.BufferedImage; import java.awt.image.ConvolveOp; import java.awt.image.Kernel; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class ImageCompress extends Frame { private static final long serialVersionUID = 48L; //原图路径 private static final String OLD_FILE_PATH = "D:/web/titzc/static/upload/images/"; //缩略图保存路径 private static final String THUMB_SAVE_PATH = "D:/web/titzc/static/upload/images/thumb/"; //缩略图文件名后缀 private static final String FILE_EXT = "_thumb"; //缩略图url private static final String THUM_URL = "http://www.titzc.com/upload/images/thumb/"; //缩略图宽度 private static final int THUMB_WIDTH = 300; //缩略图高度 private static final int THUMB_HEIGHT = 300; private static final String version = "ImageCompress v1.0"; public ImageCompress(String fileName) { super(version); file = fileName; createUI(); loadImage(fileName); setVisible(true); } /** * 压缩图片 * @param oldImagePath 老的图片路径 */ public static void ImageScale(String oldImagePath) { try { String saveThumbPath = THUMB_SAVE_PATH + currenDateFileName() + "/" + getToFileName(oldImagePath); File file = new File(oldImagePath); Image image = javax.imageio.ImageIO.read(file); int imageWidth = image.getWidth(null); int imageHeight = image.getHeight(null); if(imageWidth < 300 || imageHeight < 300){//图片不大就不压缩了 File outFile = new File(saveThumbPath); copyFile(file, outFile); } else { doScale(imageWidth, imageHeight, saveThumbPath, image); } } catch (FileNotFoundException e1) { e1.printStackTrace(); } catch (IOException e2) { e2.printStackTrace(); } } /** * 压缩图片 * @param path * @param fileName * @param toFileName */ public static void ImageScale(String path, String fileName, String toFileName) { FileOutputStream out = null; try { Image image = javax.imageio.ImageIO.read(new File(path + fileName)); int imageWidth = image.getWidth(null); int imageHeight = image.getHeight(null); float scale = getRatio(imageWidth, imageHeight, THUMB_WIDTH, THUMB_HEIGHT); imageWidth = (int) (scale * imageWidth); imageHeight = (int) (scale * imageHeight); image = image.getScaledInstance(imageWidth, imageHeight, Image.SCALE_AREA_AVERAGING); // Make a BufferedImage from the Image. BufferedImage mBufferedImage = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = mBufferedImage.createGraphics(); // Map readeringHint = new HashMap(); // readeringHint.put(RenderingHints.KEY_ALPHA_INTERPOLATION, // RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY); // readeringHint.put(RenderingHints.KEY_ANTIALIASING, // RenderingHints.VALUE_ANTIALIAS_ON); // readeringHint.put(RenderingHints.KEY_COLOR_RENDERING,RenderingHints.VALUE_RENDER_QUALITY); // readeringHint.put(RenderingHints.KEY_DITHERING, // RenderingHints.VALUE_DITHER_ENABLE); // readeringHint.put(RenderingHints.KEY_INTERPOLATION, // RenderingHints.VALUE_INTERPOLATION_BILINEAR);//VALUE_INTERPOLATION_BICUBIC // readeringHint.put(RenderingHints.KEY_RENDERING, // RenderingHints.VALUE_RENDER_QUALITY); // g.setRenderingHints(readeringHint); g2.drawImage(image, 0, 0, imageWidth, imageHeight, Color.white, null); g2.dispose(); float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2, -0.125f, -0.125f, -0.125f, -0.125f }; Kernel kernel = new Kernel(3, 3, kernelData2); ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null); mBufferedImage = cOp.filter(mBufferedImage, null); out = new FileOutputStream(THUMB_SAVE_PATH + toFileName); // JPEGEncodeParam param = // encoder.getDefaultJPEGEncodeParam(bufferedImage); // param.setQuality(0.9f, true); // encoder.setJPEGEncodeParam(param); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(mBufferedImage); } catch (FileNotFoundException fnf) { } catch (IOException ioe) { } finally { try { out.close(); out.flush(); } catch (IOException e) { e.printStackTrace(); } } } /** * 压缩方法 * @param imageWidth * @param imageHeight * @param saveThumbPath * @param image */ private static void doScale(int imageWidth, int imageHeight, String saveThumbPath, Image image) { FileOutputStream out = null; try{ float scale = getRatio(imageWidth, imageHeight, THUMB_WIDTH, THUMB_HEIGHT); imageWidth = (int) (scale * imageWidth); imageHeight = (int) (scale * imageHeight); image = image.getScaledInstance(imageWidth, imageHeight, Image.SCALE_AREA_AVERAGING); BufferedImage mBufferedImage = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = mBufferedImage.createGraphics(); g2.drawImage(image, 0, 0, imageWidth, imageHeight, Color.white, null); g2.dispose(); float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2, -0.125f, -0.125f, -0.125f, -0.125f }; Kernel kernel = new Kernel(3, 3, kernelData2); ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null); mBufferedImage = cOp.filter(mBufferedImage, null); mkdirFile(THUMB_SAVE_PATH + currenDateFileName()); out = new FileOutputStream(saveThumbPath); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(mBufferedImage); out.close(); out.flush(); } catch(Exception e){ try { out.close(); out.flush(); } catch (IOException e1) { e1.printStackTrace(); } e.printStackTrace(); } } /** * 获得thumb的url * @param oldImagePath * @return */ public static String getToThumbUrl(String oldImagePath) { return THUM_URL + currenDateFileName() + "/" + getToFileName(oldImagePath); } /** * 新文件名称_thumb * @param oldUrl * @return */ private static String getToFileName(String oldImagePath) { return getFileName(oldImagePath) + FILE_EXT + "." + getFileExt(oldImagePath).toLowerCase(); } /** * 根据imgUrl获得老文件路径: ../20150326/52811427359322671.gif * @param imgUrl * @return */ private static String getImgPath(String imgUrl) { return OLD_FILE_PATH + imgUrl.split("images")[1].split("\\/")[1] + "/" + imgUrl.split("images")[1].split("\\/")[2]; } /** * 缩放比例 * @param width * @param height * @param maxWidth * @param maxHeight * @return 缩放比例 */ private static float getRatio(int width, int height, int maxWidth, int maxHeight) { float Ratio = 1.0f; float widthRa