html2canvas截屏后上传到服务器端（springmvc3）

利用html2canvas截屏后可以生成base64类型的图片，但是这样的图片很明显不能被引用或者被SNS工具来分享。这样就必须截屏后再上传数据到后台服务器端重新保存。 

前端js代码： 

$("#saveImage").click(function() {html2canvas($(‘#mypics‘), {onrendered : function(canvas) {var myImage = canvas.toDataURL("image/jpeg");//并将图片上传到服务器用作图片分享$.ajax({type : "POST",url : ‘${ctx}/qsupload‘,data : {data:myImage},timeout : 60000,success : function(data){$(‘#myShowImage‘).attr(‘src‘, ‘${ctxStatic}/usertemp/‘+data+‘.jpg‘); //服务器上保存图片路径，data是返回的文件名。}});}});});

后端代码 

import org.apache.commons.codec.binary.Base64;@RequestMapping(value = { "${frontPath}/qsupload" }, method = { RequestMethod.POST })@ResponseBodypublic String petUpgradeTarget(HttpServletRequest request, String data) {String serverPath = request.getSession().getServletContext().getRealPath("/");Base64 base64 = new Base64();try {//注意点：实际的图片数据是从 data:image/jpeg;base64, 后开始的byte[] k = base64.decode(data.substring("data:image/jpeg;base64,".length()));InputStream is = new ByteArrayInputStream(k);String fileName = UUID.randomUUID().toString();String imgFilePath = serverPath + "\\static\\usertemp\\" + fileName + ".jpg";//以下其实可以忽略，将图片压缩处理了一下，可以小一点double ratio = 1.0;BufferedImage image = ImageIO.read(is);int newWidth = (int) (image.getWidth() * ratio);int newHeight = (int) (image.getHeight() * ratio);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(imgFilePath));return fileName;} catch (Exception e) {return "error";}}

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