ajax上传文件

    private static  final  String FILE_SEPARATOR = System.getProperties().getProperty("file.separator");    

    @ResponseBody
    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST, produces = "application/json")
    public Map<String,String> uploadFile(MultipartHttpServletRequest request, HttpServletResponse response) throws Exception {
        Map<String, String> map = new HashMap<String, String>();
        try {
            String realPath = request.getSession().getServletContext().getRealPath(FILE_SEPARATOR);
            StringBuffer realPathSbf = new StringBuffer(realPath);
            realPathSbf.append(FILE_PATH);
            CommonsMultipartFile importFile = (CommonsMultipartFile) request.getFile("file");
            String fileName = importFile.getOriginalFilename();
            String allPath = realPathSbf.append(FILE_SEPARATOR).append(fileName).toString();
            InputStream is = importFile.getInputStream();
            File file = new File(allPath);
            FileUtils.copyInputStreamToFile(is,file);
            String url = jssService.uploadResourceWithName(file);
            FileUtils.forceDelete(file);
            map.put("url", url);
            map.put("yn", SuccessEnum.YES.getCode());
        }catch (Exception e){
            map.put("yn",SuccessEnum.NO.getCode());
            logger.error("上传附件异常",e);
    }
        return map;
    }



    $("#uploadBtnFile").bind("click", function () {
        var file = $("#filePic").val();
        if (file == null || file == "") {
            alert("请添加上传文件");
            return;
        }
        var formUrl = "/qc/basic-data/uploadFile";
        var formData = new FormData();
        formData.append("file", $('#filePic')[0].files[0]);
        $.ajax({
            url: formUrl,
            data: formData,
            type: "post",
            cache: false,
            processData: false,
            contentType: false,
            success: function (data) {
                if (data.yn == 1) {
                    alert("上传成功");
                    $("#attachmentUrl").val(data.url);
                } else {
                    alert("上传失败");
                }
                $('#fileUploadBtn').hide();
            },
            error: function (data) {
                alert("上传失败!");
            }
        })
    });


<div class="alert alert-result" id="fileUploadBtn">
    <i class="close alert-close" id="fileUploadBtnClose"></i>
    <div class="info">
        <input type="hidden" id="attachmentUrl" name="attachmentUrl"/>
        <input type="file" name="filePic" id="filePic"/><br /><br /><br />
        <a class="btn-c2 btn-h1" id="uploadBtnFile" name="uploadBtnFile" href="#">上传文件</a>
    </div>
</div>