Spring Boot 使用 ServletFileUpload上传文件失败，upload.parseRequest(request)为空

使用Apache Commons FileUpload组件上传文件时总是返回null，调试发现ServletFileUpload对象为空，在Spring Boot中有默认的文件上传组件，在使用ServletFileUpload时需要关闭Spring Boot的默认配置，

禁用MultipartResolverSpring提供的默认值

1.0在配置文件中添加

spring.http.multipart.enabled=false

2.0在配置文件中添加

spring.servlet.multipart.enabled=false

    @RequestMapping("/upload")

    public void upload(HttpServletRequest request, HttpServletResponse response) {

        System.out.println("进入后台...");

        // 1.创建DiskFileItemFactory对象，配置缓存用

        DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();

        // 2. 创建 ServletFileUpload对象

        ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);

        // 3. 设置文件名称编码

        servletFileUpload.setHeaderEncoding("utf-8");

        // 4. 开始解析文件

        // 文件md5获取的字符串

        String fileMd5 = null;

        // 文件的索引

        String chunk = null;

        try {

            List<FileItem> items = servletFileUpload.parseRequest(new ServletRequestContext(request));

            for (FileItem fileItem : items) {

                if (fileItem.isFormField()) { // >> 普通数据

                    String fieldName = fileItem.getFieldName();

                    if ("info".equals(fieldName)) {

                        String info = fileItem.getString("utf-8");

                        System.out.println("info:" + info);

                    }

                    if ("fileMd5".equals(fieldName)) {

                        fileMd5 = fileItem.getString("utf-8");

                        System.out.println("fileMd5:" + fileMd5);

                    }

                    if ("chunk".equals(fieldName)) {

                        chunk = fileItem.getString("utf-8");

                        System.out.println("chunk:" + chunk);

                    }

                } else {

                    // 如果文件夹没有创建文件夹

                    File file = new File(serverPath + fileMd5);

                    if (!file.exists()) {

                        boolean result = file.mkdirs();

                        System.out.println(result);

                    }

                    // 保存文件

                    File chunkFile = new File(serverPath + fileMd5 + "/" + chunk);

                    FileUtils.copyInputStreamToFile(fileItem.getInputStream(), chunkFile);

                }

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

<!DOCTYPE html>

<html lang="en">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    <title>Insert title here</title>

</head>

<body>

<form action="/upload" method="post" enctype="multipart/form-data">

    文件：<input type="file" value="请选择文件" name="file"/> <br/>

    信息：<input type="text" name="info"/> <br/>

    <input type="submit" value="提交"/>

</form>

</body>

</html>