文件名称:用java如何把图片处理到指定大小
文件大小:3KB
文件格式:TXT
更新时间:2012-08-29 00:45:52
用java如何把图片处理到指定大小
用java如何把图片处理到指定大小 切割程序如下: public void cut(String srcImageFile,FileOutputStream fileout, int w, int h, int x1, int y1, int sw, int sh) { // TODO Auto-generated method stub try { // http://localhost:8080/ImpCra/createServlet?p=Sunset.jpg&x=117&y=201&w=61&h=50&pw=300&ph=400 Image img; ImageFilter cropFilter; // 读取源图像 BufferedImage bi = ImageIO.read(new File(srcImageFile)); if (sw >= w && sh >= h) { Image image = bi.getScaledInstance(sw, sh, Image.SCALE_DEFAULT); // 剪切起始坐标点 int x = x1; int y = y1; int destWidth = w; // 切片宽度 int destHeight = h; // 切片高度 // 图片比例 double pw = sw; double ph = sh; double m = (double) sw / pw; double n = (double) sh / ph; System.out.println(m); int wth = (int) (destWidth * m); int hth = (int) (destHeight * n); int xx = (int) (x * m); int yy = (int) (y * n); // 四个参数分别为图像起点坐标和宽高 // 即: CropImageFilter(int x,int y,int width,int height) cropFilter = new CropImageFilter(xx, yy, wth, hth); img = Toolkit.getDefaultToolkit().createImage( new FilteredImageSource(image.getSource(), cropFilter)); BufferedImage tag = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(img, 0, 0, null); // 绘制缩小后的图 g.dispose(); // 输出为文件 ImageIO.write(tag, "JPEG", fileout); } } catch (Exception e) { e.printStackTrace(); } }