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 $("#submit-btn").on('click', function() { $.ajax({ url:"/test/upload", type:"post", data:new FormData($("#myForm").get(0)), //十分重要，不能省略 cache: false, processData: false, contentType: false, success: function () { alert("上传成功！"); } }); }); 

 $('#u_photo').on('change', function() { var file = this.files[0]; if (file.size > 1024*1000) { alert('文件最大1M！') } });

 xhr: function() { var myXhr = $.ajaxSettings.xhr(); if (myXhr.upload) { myXhr.upload.addEventListener('progress', function(e) { if (e.lengthComputable) { $('progress').attr({ value: e.loaded, max: e.total, }); } } , false); } return myXhr; }

commons-iocommons-io2.5commons-fileuploadcommons-fileupload1.3.2

 @RequestMapping(value="/test/upload",method = RequestMethod.POST) @ResponseBody public String upload(@RequestParam("u_photo") MultipartFile u_photo) { System.out.println("u_photo="+u_photo.getSize()); return "ok"; }