用AJAX异步提交表单上传多个文件（type=‘file‘）案例

    因为在框架中上传文件时不适合直接用form提交，因为这样会刷新页面。我们一般会用ajax进行异步上传。此方法可上传多种类型文件。

    html代码：

    注意如果要多选文件需要在input上增加属性 multiple="multiple"

<form action="uploadTrainProduct" method="post" enctype="multipart/form-data" id="form1">
    <div class="modal fade" id="trainInfoModal" tabindex="-1" role="dialog" aria-labelledby="orderInfoModalLabel"
         aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">
                        ×
                    </button>
                    <h4 class="modal-title" id="orderInfoModalLabel1">
                        培训产品上传
                    </h4>
                </div>
                <div class="modal-body">
                    <div class="row" style="margin-top: 10px">

                        <div class="col-sm-5 " style="text-align:center;">

                            <label for="file"class="btn btn-default">上传培训产品</label>

                            <input id="file"type="file"style="display:none" class="form-control" name="file" multiple="multiple">
                            <!--注意点：要多选文件要用multiple="multiple"-->
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">关闭
                    </button>
                    <button type="button" class="btn btn-primary" onclick="uploadTrainProduct()">
                        确定
                    </button>
                </div>
            </div>
        </div>
    </div>
</form>

    js:

function uploadTrainProduct(){
    var formData = new FormData($("#form1")[0]);  //重点：要用这种方法接收表单的参数
    $.ajax({
        url : "/it/orderManage/uploadTrainProduct",
        type : 'POST',
        data : formData,
        // 告诉jQuery不要去处理发送的数据
        processData : false,                 
        // 告诉jQuery不要去设置Content-Type请求头
        contentType : false,
        async : false,
        success : function(data) {
            if(data){
            }
        }
    });
}

    java代码：

@RequestMapping(value = "/uploadTrainProduct", method = RequestMethod.POST, produces = "text/html;charset=utf-8")
    @ResponseBody
    public String uploadTrainProduct(
            @RequestParam(value = "file") MultipartFile[] files,  //这样接收文件
            @RequestParam(value = "id") String id,            //接收其他参数
            @RequestParam(value = "content") String content,
            HttpServletRequest request
    ) {
        try {
            for (MultipartFile file : files) {    //循环保存文件
                uploadFile(file, request);
            }
            // 返回前台
            return "success";

        } catch (Exception e) {
            e.printStackTrace();
            return "fail";
        }

    }

    public String uploadFile(MultipartFile file, HttpServletRequest request) throws IOException {
        String fileName = file.getOriginalFilename();
        String path="d:/images/m2";            //设置文件保存路径
//        File tempFile = new File(path, new Date().getTime() + String.valueOf(fileName));
        File tempFile = new File(path, String.valueOf(fileName));
        if (!tempFile.getParentFile().exists()) {    //创建文件夹
            tempFile.getParentFile().mkdir();
        }
        if (!tempFile.exists()) {
            tempFile.createNewFile();
        }
        file.transferTo(tempFile);
        return "images/" + tempFile.getName();
    }

可以试试，非常好用