java图片高保真缩放

public class NarrowImage {/** * @param im *            原始图像 * @param resizeTimes *            倍数,比如0.5就是缩小一半,0.98等等double类型 * @return 返回处理后的图像 */public BufferedImage zoomImage(String src) {BufferedImage result = null;try {File srcfile = new File(src);if (!srcfile.exists()) {System.out.println("文件不存在");}BufferedImage im = ImageIO.read(srcfile);/* 原始图像的宽度和高度 */int width = im.getWidth();int height = im.getHeight();//压缩计算float resizeTimes = 0.3f;  /*这个参数是要转化成的倍数,如果是1就是转化成1倍*//* 调整后的图片的宽度和高度 */int toWidth = (int) (width * resizeTimes);int toHeight = (int) (height * resizeTimes);/* 新生成结果图片 */result = new BufferedImage(toWidth, toHeight,BufferedImage.TYPE_INT_RGB);result.getGraphics().drawImage(im.getScaledInstance(toWidth, toHeight,java.awt.Image.SCALE_SMOOTH), 0, 0, null);} catch (Exception e) {System.out.println("创建缩略图发生异常" + e.getMessage());}return result;} public boolean writeHighQuality(BufferedImage im, String fileFullPath) {        try {            /*输出到文件流*/            FileOutputStream newimage = new FileOutputStream(fileFullPath);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);            JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(im);            /* 压缩质量 */            jep.setQuality(0.9f, true);            encoder.encode(im, jep);           /*近JPEG编码*/            newimage.close();            return true;        } catch (Exception e) {            return false;        }    }   public static void main(String[] args) {  String inputFoler = "E:\\新建文件夹\\7.jpg" ;          /*这儿填写你存放要缩小图片的文件夹全地址*/        String outputFolder = "E:\\新建文件夹\\07.jpg";          /*这儿填写你转化后的图片存放的文件夹*/               NarrowImage narrowImage = new NarrowImage(); narrowImage.writeHighQuality(narrowImage.zoomImage(inputFoler), outputFolder);}}