Java 压缩图片

/** * 压缩图片方法 *  * @param oldFile *            将要压缩的图片 * @param width *            压缩宽 * @param height *            压缩高 * @param quality *            压缩清晰度 <b>建议为1.0</b> * @param smallIcon *            压缩图片后,添加的扩展名（在图片后缀名前添加） * @param percentage *            是否等比压缩 若true宽高比率将将自动调整 * @author slzs * @return 如果处理正确返回压缩后的文件名 null则参数可能有误 */public static String doCompress(String oldFile, int width, int height, float quality, String smallIcon, boolean percentage) {if (oldFile != null && width > 0 && height > 0) {Image srcFile = null;String newImage = null;try {File file = new File(oldFile);// 文件不存在if (!file.exists()) {return null;}/* 读取图片信息 */srcFile = ImageIO.read(file);if(srcFile == null){return null;}int new_w = width;int new_h = height;if (percentage) {// 为等比缩放计算输出的图片宽度及高度double rate1 = ((double) srcFile.getWidth(null)) / (double) width + 0.1;double rate2 = ((double) srcFile.getHeight(null)) / (double) height + 0.1;double rate = rate1 > rate2 ? rate1 : rate2;new_w = (int) (((double) srcFile.getWidth(null)) / rate);new_h = (int) (((double) srcFile.getHeight(null)) / rate);}/* 宽高设定 */BufferedImage tag = new BufferedImage(new_w, new_h, BufferedImage.TYPE_INT_RGB);tag.getColorModel();tag.getGraphics().drawImage(srcFile, 0, 0, new_w, new_h,Color.white,null);/* 压缩后的文件名 */String filePrex = oldFile.substring(0, oldFile.lastIndexOf('.'));newImage = filePrex + smallIcon + oldFile.substring(filePrex.length());/* 压缩之后临时存放位置 */FileOutputStream out = new FileOutputStream(newImage);JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);/* 压缩质量 */jep.setQuality(quality, true);encoder.encode(tag, jep);out.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if(srcFile != null){srcFile.flush();}}return newImage;} else {return null;}}

ImageUtils.doCompress("h:/_test/123.jpg", 500, 500, 2, "_small", false);