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1 var dataUrl = $(‘#canvas‘).getDataUrl(); 2 var img = $(‘<img>‘).attr(‘src‘, dataUrl); //显示图片 3 var oMyForm = new FormData(); //创建formdata 4 var blobBin = dataURLtoBlob(dataUrl); //base64转换blob 5 oMyForm.append("blobObject", blobBin); //想formData添加blob数据 6 $.ajax({ 7 url: $.getUrl()+"activity/updateImg", 8 type: "POST", 9 data: oMyForm, 10 async: false, 11 cache: false, 12 contentType: false, 13 processData: false, 14 success: function (msg) { 15 console.log("yes"); 16 } 17 }); 18 19 //**dataURL to blob** dataURL转换blob 20 function dataURLtoBlob(dataurl) { 21 var arr = dataurl.split(‘,‘), mime = arr[0].match(/:(.*?);/)[1], 22 bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n); 23 while (n--) { 24 u8arr[n] = bstr.charCodeAt(n); 25 } 26 return new Blob([u8arr], { type: mime }); 27 }
1 @RequestMapping(value="updateImg",method=RequestMethod.POST) 2 public void upLoad(HttpServletRequest request,HttpServletResponse response) throws IOException { 3 System.out.println("enter..."); 4 // 从请求中获取到文件信息需要将请求转换为MultipartHttpServletRequest类型 5 MultipartHttpServletRequest MulRequest = request instanceof MultipartHttpServletRequest ? (MultipartHttpServletRequest) request : null; 6 Iterator<String> fileNames = MulRequest.getFileNames(); 7 byte[] imgByte = null; 8 if (fileNames.hasNext()) { // 遍历请求中的图片信息 9 String fileName = fileNames.next(); // 图片对应的参数名 10 MultipartFile file = MulRequest.getFile(fileName); // 获取到图片 11 if (file != null) { 12 System.out.println("file.getSize():" + file.getSize()); // 图片大小 13 imgByte=file.getBytes();// 可以获取到图片的字节数组 14 } 15 } 16 17 for(int i=0;i<imgByte.length;++i) 18 { 19 if(imgByte[i]<0) 20 {//调整异常数据 21 imgByte[i]+=256; 22 } 23 } 24 //生成jpeg图片 25 String imgFilePath = "d://222.jpg";//新生成的图片 26 OutputStream out = new FileOutputStream(imgFilePath); 27 out.write(imgByte); 28 out.flush(); 29 out.close(); 30 }
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原文地址：http://www.cnblogs.com/guyg/p/5857596.html
