Java Web file upload and java Web file upload

Java Web file upload and java Web file upload

Note: If the Request Entity is Too Large, modify the size of the Nginx server (Baidu refer to the solution of 413 Request Entity Too Large)
Jsp: <input type = "file" style = "height: 114px; width: 100%; position: absolute; opacity: 0;" name = "file1" id = "file1">

$ (Function () {$ ("# file1 "). change (function () {// create the FormData object var data = new FormData (); // Add data for the FormData object $. each ($ ('# file1') [0]. files, function (I, file) {data. append ('upload _ file', file) ;}); $. ajax ({url: '$ {pageContext. request. contextPath}/uploadimag', type: 'post', data: data, cache: false, contentType: false, // processData: false, // success: function (data) {// display the append var imgUrl = "/" + data; var showImg = "<div class = 'img-item'>" + " </span> "+" </div> "; $ ("# addImg "). before (showImg); // data appending var inputImg = "<input type = 'den den 'name = 'postimag' value = '" + imgUrl + "'> "; $ ("# typeId "). after (inputImg );}});});});

Java Background:

1 @ RequestMapping (value = "/uploadImage", method = RequestMethod. POST) 2 @ ResponseBody 3 public String uploadImage (HttpServletRequest request) throws IOException {4 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; 5 Iterator <String> iterator = multipartRequest. getFileNames (); 6 String fileName = ""; 7 SimpleDateFormat sdf = new SimpleDateFormat ("yyyyMMdd"); 8 St Ring dir = "upload/" + sdf. format (new Date () + "/"; 9 String realPath = request. getSession (). getServletContext (). getRealPath ("/"); 10 while (iterator. hasNext () {11 MultipartFile multipartFile = multipartRequest. getFile (iterator. next (); 12 if (multipartFile! = Null) {13 String fn = multipartFile. getOriginalFilename (); 14 String suffix = fn. substring (fn. lastIndexOf (". "); 15 fileName = dir + Utils. getRandomStringByLength (6) + suffix; 16 String path = realPath + fileName; 17 path = path. replace ("\", "/"); 18 File f = new File (path); 19 if (! F. mkdirs () {20 f. mkdir (); 21} 22 multipartFile. transferTo (f); 23} 24} 25 return fileName; 26} 27 // the above method requires the following method 28 public String getRandomStringByLength (int length) {29 String base = "abcdefghijklmnopqrstuvwxyz0123456789"; 30 Random random = new Random (); 31 StringBuffer sb = new StringBuffer (); 32 for (int I = 0; I <length; I ++) {33 int number = random. nextInt (base. length (); 34 sb. append (base. charAt (number); 35} 36 return sb. toString (); 37}