js截取div生成图片

方法一、 String fileType =".png"; String inputFilePath="C:/Users/zhang/Downloads/html2canvas-0.4.1/build/"; String fileName = System.currentTimeMillis()+".png"; //注意点：实际的图片数据是从 data:image/jpeg;base64, 后开始的 Base64 base64 = new Base64(); String data = request.getParameter("data"); String base64Str = data.substring("data:image/jpeg;base64,".length()-1); byte[] k = base64.decode(base64Str); InputStream is = new ByteArrayInputStream(k); BufferedImage image = ImageIO.read(is); int newWidth = (int) (image.getWidth() * 1); int newHeight = (int) (image.getHeight() * 1); Image newimage = image.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH); BufferedImage tag = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(newimage, 0, 0, null); g.dispose(); ImageIO.write(tag, "jpg", new File(inputFilePath+fileName)); 方法二、 static BASE64Encoder encoder = new sun.misc.BASE64Encoder(); static BASE64Decoder decoder = new sun.misc.BASE64Decoder(); public static void base64StringToImage(String base64String,String path){ try { byte[] bytes1 = decoder.decodeBuffer(base64String); ByteArrayInputStream bais = new ByteArrayInputStream(bytes1); BufferedImage bi1 =ImageIO.read(bais); File w2 = new File(path);//可以是jpg,png,gif格式 ImageIO.write(bi1, "png", w2);//不管输出什么格式图片，此处不需改动 } catch (IOException e) { e.printStackTrace(); } }