自定义前端文件上传

1 <form style="display:none;" id="form-upload" method="post" enctype="multipart/form-data" action="/test/upload">
2     <input type="hidden"  name="id" value="123">
3     <input type="file" name="file">
4 </form>
5 <button class="btn-upload" id="btn-upload" >上传</button>

 1 <script type="text/javascript">
 2 (function(){
 3     // 劫持上传按钮点击事件，以做到文件上传自定义的目的
 4     var objBtnFileUpload = $("#form-upload").find("input[type=‘file‘]");
 5     $("btn-upload").click(function(){
 6         objBtnFileUpload.trigger("click");
 7     });
 8     // 文件上传完成，input[type=‘file‘]改变，触发上传
 9     objBtnFileUpload.change(function() {
10             var self = $(this);
11             var form = self.parent("form");
12             var formData = new FormData(form[0]);//用这种方式获取值可以不触发页面跳转
13             $.ajax({
14                 type : form.attr(‘method‘),
15                 url : form.attr(‘action‘),
16                 data : formData,
17                 mimeType : form.attr(‘enctype‘),
18                 contentType : false,
19                 cache : false,
20                 processData : false
21             }).success(function(ret) {
22                 console.log(ret);
23                 alert("上传成功");
24             }).fail(function(jqXHR, textStatus, errorThrown) {
25                 //错误信息
26                 console.log(jqXHR);
27                 alert("上传失败！");
28             });
29         });
30     }
31 })();
32 </script>

/**
 * <p>上传后台</p>
 * */
@RequestMapping(value = "/test/upload", method = RequestMethod.POST)
@ResponseBody
public String addFillForm(@RequestParam("file") MultipartFile file,HttpServletRequest request) {
    String id = request.getParameter("id");//额外的表单参数可以通过这种方式接收
    byte[] bFile = file.getBytes();
    String strFileName = file.getName();
    //业务逻辑

    return "上传成功";
}