序

这里展示一下如何对图片进行压缩和resize。

压缩

public static boolean compress(String src,String to, float quality) {        boolean rs = true;        // Build param        JPEGEncodeParam param = null;        // Build encoder        File destination = new File(to);        FileOutputStream os = null;        try {            BufferedImage image = ImageIO.read(new File(src));            param = JPEGCodec.getDefaultJPEGEncodeParam(image);            param.setQuality(quality, false);            os = FileUtils.openOutputStream(destination);            JPEGImageEncoder encoder;            if (param != null) {                encoder = JPEGCodec.createJPEGEncoder(os, param);            } else {                return false;            }            encoder.encode(image);        } catch(Exception e){            e.printStackTrace();            rs = false;        }finally {            IOUtils.closeQuietly(os);        }        return rs;    }

resize

public static boolean resize(String src,String to,int newWidth,int newHeight) {        try {            File srcFile = new File(src);            File toFile = new File(to);            BufferedImage img = ImageIO.read(srcFile);            int w = img.getWidth();            int h = img.getHeight();            BufferedImage dimg  = new BufferedImage(newWidth, newHeight, img.getType());            Graphics2D g = dimg.createGraphics();            g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);            g.drawImage(img, 0, 0, newWidth, newHeight, 0, 0, w, h, null);            g.dispose();            ImageIO.write(dimg, "jpg", toFile);        } catch (Exception e) {            e.printStackTrace();            return false;        }        return true;    }