Jquery 的ajax实现文件上传，校验。

Html代码：

<div align="center"><form id="uploadForm"><input type="file" id="file" name="file"/><br/> <br/><div class="iDate date"><input type="text" id="datetime" name="datetime"><button type="button" class="addOn"></button></div><br/><br/><input type="button" id="button" value="比较"/> </form><br/> <br/><p id="result" > </p>
</div>

Js代码：

$("#button").click(function(){ var obj = document.getElementById('file');if(obj.value==''){alert('请选择要核对的微信文件');return;}var stuff=obj.value.match(/^(.*)(\.)(.{1,8})$/)[3];if(stuff!='csv'){alert('文件类型不正确，请选择.csv文件');return;}//获取文件名var file = document.getElementById('file').files;var filename = file[0].name;//获取选择的时间var datetime = $("#datetime").val();var strs= new Array(); //定义一数组strs = datetime.split("-"); //字符分割/* alert(strs[1]);alert(strs[2]);  */if(filename.indexOf(strs[1]) < 0 || filename.indexOf(strs[2]) < 0){alert("请选择和文件相对应的核对时间！");return;}var test = window.location.href;var url = test.indexOf("?");if(url == -1){alert(test);}else{test = test.substr(0,url);alert(test);}var formData = new FormData();formData.append("myfile", document.getElementById("file").files[0]);formData.append("datetime", datetime);$.ajax({url:test+'/ToCheck',type: 'POST',cache: false,data: formData,  processData : false,contentType : false,success : function(jsonResponse) {alert(jsonResponse.returnMessage);/* $("#result").text(jsonResponse.returnMessage); */$("#result").html(jsonResponse.returnMessage);}, error : function(jsonResponse) {alert("核对出错！！");} });});

后台接收：

        @SuppressWarnings("unchecked")@RequestMapping(value = "/ToCheck")@ResponseBodypublic JsonResponse onFind(@RequestParam(value = "myfile", required = false)MultipartFile file,HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {JsonResponse jsonResponse = new JsonResponse();jsonResponse.setReturnType(0);String fileName = file.getOriginalFilename();System.out.println(fileName);String datetime = request.getParameter("datetime");System.out.println(request.getParameter("datetime"));CommonsMultipartFile cFile = (CommonsMultipartFile) file;DiskFileItem fileItem = (DiskFileItem) cFile.getFileItem();InputStream inputStream = fileItem.getInputStream();FileInputStream fin = null;// 如果是FileInputStream类型，进行转换if (inputStream instanceof FileInputStream) {System.out.println("1111");fin = (FileInputStream) inputStream;}if(fin != null){try {jsonResponse.setReturnMessage(testCheck(datetime, fin));} catch (Exception e) {e.printStackTrace();}}else{jsonResponse.setReturnMessage("上传的文件无法解析");}System.out.println(jsonResponse.getReturnMessage());return  jsonResponse;}