Ajax 上传图片并预览的简单实现

!DOCTYPE html>
html>
head>
meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
title>图片上传 | cookie/title>
/head>
body>
  file: input type="file" id="images" name="image" />br>br>
  desc: input type="text" id="desc" name="desc" />br>br>
  input type="button" value="upload" onclick="upload();">
  
  div class="images">/div>
  
script type="text/javascript" src="js/jquery-1.12.4.min.js">/script>
script type="text/javascript" src="js/upload.js">/script>
script type="text/javascript">
  function upload() {
    $.ajaxFileUpload({
      url : 'upload.htm',
      fileElementId : 'images',
      dataType : 'json',
      data : {desc : $("#desc").val()},
      success : function(data) {
        var html = $(".images").html();
        html += 'img width="100" height="100" src="/HotelManager/upload/' + data.url + '">'
        $(".images").html(html);
      }
    })
    return false;
  }
/script>
/body>
/html>

protected void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    DiskFileItemFactory factory = new DiskFileItemFactory();
    
    ServletFileUpload upload = new ServletFileUpload(factory);
    
    String path = request.getServletContext().getRealPath("/upload");
    String name = null;
    try {
      ListFileItem> items = upload.parseRequest(request);
      for (FileItem item : items) {
        if(item.isFormField()){
          System.out.println(item.getFieldName() + ": " + item.getString());
        } else {
          name = item.getName();
          item.write(new File(path,name));
        }
      }
      PrintWriter out = response.getWriter();
      out.print("{");
      out.print("url:\"" + name +"\"");
      out.print("}");
      
    } catch (Exception e) {
      e.printStackTrace();
    }
  }