java对图片进行压缩和resize

序

这里展示一下如何对图片进行压缩和resize。

压缩

1public static boolean compress(String src,String to, float quality) {
2        boolean rs = true;
3
4        // Build param
5        JPEGEncodeParam param = null;
6
7        // Build encoder
8        File destination = new File(to);
9        FileOutputStream os = null;
10        try {
11            BufferedImage image = ImageIO.read(new File(src));
12            param = JPEGCodec.getDefaultJPEGEncodeParam(image);
13            param.setQuality(quality, false);
14
15            os = FileUtils.openOutputStream(destination);
16            JPEGImageEncoder encoder;
17            if (param != null) {
18                encoder = JPEGCodec.createJPEGEncoder(os, param);
19            } else {
20                return false;
21            }
22            encoder.encode(image);
23        } catch(Exception e){
24            e.printStackTrace();
25            rs = false;
26        }finally {
27            IOUtils.closeQuietly(os);
28        }
29        return rs;
30    }

resize

1public static boolean resize(String src,String to,int newWidth,int newHeight) {
2        try {
3            File srcFile = new File(src);
4            File toFile = new File(to);
5            BufferedImage img = ImageIO.read(srcFile);
6            int w = img.getWidth();
7            int h = img.getHeight();
8            BufferedImage dimg  = new BufferedImage(newWidth, newHeight, img.getType());
9            Graphics2D g = dimg.createGraphics();
10            g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
11            g.drawImage(img, 0, 0, newWidth, newHeight, 0, 0, w, h, null);
12            g.dispose();
13            ImageIO.write(dimg, "jpg", toFile);
14        } catch (Exception e) {
15            e.printStackTrace();
16            return false;
17        }
18        return true;
19    }