Java图片切割

2019-04-15 15:53发布

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protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String Pic = (String) request.getParameter("p"); int PointX = Integer.parseInt(request.getParameter("x")); int PointY = Integer.parseInt(request.getParameter("y")); int CutWidth = Integer.parseInt(request.getParameter("w")); int CutHeight = Integer.parseInt(request.getParameter("h")); // 图片宽度 int PicWidth = Integer.parseInt(request.getParameter("pw")); // 图片高度 int PicHeight = Integer.parseInt(request.getParameter("ph")); response.setContentType("image/jpeg"); response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); HttpSession session = request.getSession(); String picPath = Pic; String path = request.getRealPath(picPath); ServletOutputStream responseOutputStream = response.getOutputStream(); cut(path, responseOutputStream, CutWidth, CutHeight, PointX, PointY, PicWidth, PicHeight); // 以下关闭输入流！ responseOutputStream.flush(); responseOutputStream.close(); } /** * 图片切割 * @param srcImageFile 图片地址 * @param responseOutputStream servlet输出流 * @param w 切割宽度 * @param h 切割高度 * @param x1 开始x结点（left） * @param y1 开始y结点（top） * @param sw 图片宽度 * @param sh 图片高度 */ public void cut(String srcImageFile,ServletOutputStream responseOutputStream, int w, int h, int x1, int y1, int sw, int sh) { 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; 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", responseOutputStream); } } catch (Exception e) { e.printStackTrace(); } } JavaScript 图片切割效果（带拖放、缩放效果）