1. 直接上最简单的 一种 ajax 异步上传图片，并预览
html:
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5 <title>图片上传 | cookie</title> 6 </head> 7 <body> 8 file: <input type="file" id="images" name="image" /><br><br> 9 desc: <input type="text" id="desc" name="desc" /><br><br>10 <input type="button" value="upload" onclick="upload();">11 12 <div class="images"></div>13 14 <script type="text/javascript" src='/images/loading.gif' data-original="js/jquery-1.12.4.min.js"></script>15 <script type="text/javascript" src='/images/loading.gif' data-original="js/upload.js"></script>16 <script type="text/javascript">17 function upload() {18 $.ajaxFileUpload({19 url : 'upload.htm',20 fileElementId : 'images',21 dataType : 'json',22 data : {desc : $("#desc").val()},23 success : function(data) {24 var html = $(".images").html();25 html += '<img width="100" height="100" src='/images/loading.gif' data-original="http://www.cnblogs.com//HotelManager/upload/' + data.url + '">'26 $(".images").html(html);27 }28 })29 return false;30 }31 </script>32 </body>33 </html>
servlet:
1 protected void doPost(HttpServletRequest request, HttpServletResponse response) 2 throws ServletException, IOException { 3 DiskFileItemFactory factory = new DiskFileItemFactory(); 4 5 ServletFileUpload upload = new ServletFileUpload(factory); 6 7 String path = request.getServletContext().getRealPath("/upload"); 8 String name = null; 9 try {10 List<FileItem> items = upload.parseRequest(request);11 for (FileItem item : items) {12 if(item.isFormField()){13 System.out.println(item.getFieldName() + ": " + item.getString());14 } else {15 name = item.getName();16 item.write(new File(path,name));17 }18 }19 PrintWriter out = response.getWriter();20 out.print("{");21 out.print("url:\"" + name +"\"");22 out.print("}");23 24 } catch (Exception e) {25 e.printStackTrace();26 }27 }
3. 这里会 用到一个 ajaxupload.js， 网上多得很，实在找不到，也可以私我，给你们
原标题：Ajax 上传图片并预览
关键词：ajax
我知道了 