<form id="uploadForm" enctype = "multipart/form-data">
    <input type ="text" id ="uploadParams" vlaue = "uploadParams" />
    <input type = "file" name = "uploadfile" id = "uploadfile" />
    <input type = "button" id = "btnSave" onclick = "uploadSubmit" />
</form>

function uploadSubmit() {
    if (!$("#uploadfile").val()) {
        console.log("上传失败，文件是空的");
        return false;
    }
    var paramValue = $("#uploadParams").val();
    var formData = new FormData($("#uploadForm"));
    formData.append("paramValue",paramValue);
    $.ajax({
        url: "your server url",
        type: "post",
        data: formdata,
        success: function (result) {
            console.log("上传成功");
        },
        error: function (a, b, c) {
            console.log("失败了");
        },
        complete: function () {
            console.log("请求最后处理的方法");
        },
    })
}

@RequestMapping("upload")
public String upload(@RequestParam("uploadfile") MultipartFile file,@RequestParam("paramValue") String paramvalue,HttpServletRequest request){
    try{
        //得到文件"upload"的服务器路径
        String sysPath=request.getSession().getServletContext().getRealPath("upload");
        String fileName=file.getOriginalFilename();    //得到文件名
        File filePath=new File(sysPath,fielName);    //得到文件路径
        if(!filePath.getParentFile().exists()){    //判断服务器当前路径文件夹是否存在
            filePath.getParentFile().mkdirs();    //不存在则创建文件夹
        }
        BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream(filePath));
        out.write(file.getBytes());
        out.flush();
        out.close();
    }catch(fileNotFoundException e){
        e.printStrackTrace();
        return "失败";
    }catch(IOException e){
        e.printStrackTrace();
        return "失败";
    }
}