一、form表单属性中加上enctype="multipart/form-data"

form表单的

二、配置文件中配置MultipartResolver

文件超出限制会在进入controller前抛出异常，在允许范围内这个配置无影响

三、MultipartFile

接受文件并通过IO二进制流(MultipartFile.getInputStream())输入到FileOutStream保存文件，然后该干嘛就干嘛

参数接收同MultipartFile 接收一样。

接受form表单截图中name为file和id的文件和参数。如下

@RequestMapping(value = "attendee_uploadExcel.do")

@ResponseBody

public void uploadExcel(@RequestParam("file")

MultipartFile file, @RequestParam("id")

String id) throws Exception {

//form表单提交的参数测试为String类型

if (file == null) return ;

String fileName = file.getOriginalFilename();

String path =

getRequest().getServletContext().getRealPath("/upload/excel");

//获取指定文件或文件夹在工程中真实路径，getRequest()这个方法是返回一个HttpServletRequest，封装这个方法为了处理编码问题

FileOutputStream fos =

FileUtils.openOutputStream(new

File(path+"/"

+fileName));//打开FileOutStrean流

IOUtils.copy(file.getInputStream(),fos);//将MultipartFile file转成二进制流并输入到FileOutStrean

fos.close();//

......

}

四、servlet上传文件。HttpServletRequest

req强转成MultipartHttpServletRequest

req后，req.getParameter("id");

HttpServletRequest request;

MultipartHttpServletRequest multipartRequest =

(MultipartHttpServletRequest) request;

MultipartFile file

= multipartRequest.getFile("file");

String id = multipartRequest.getParameter("id");

String fileName = file.getOriginalFilename();

五、maven配置

添加maven依赖：

commons-fileupload

commons-fileupload

1.2.2

Spring注解配置：

@Bean

public MultipartResolver multipartResolver() throws IOException

{

CommonsMultipartResolvercommonsMultipartResolver=new CommonsMultipartResolver();

commonsMultipartResolver.setUploadTempDir(new

FileSystemResource("fileUpload/temp"));//上传中临时文件存放目录

commonsMultipartResolver.setMaxUploadSize(2097152);//上传文件的总大小限制,这里设置为2G

commonsMultipartResolver.setDefaultEncoding("UTF-8");//编码

//commonsMultipartResolver.setResolveLazily();//延迟解析，解析文件的时候再抛异常

//commonsMultipartResolver.setServletContext();

commonsMultipartResolver.setMaxInMemorySize(1024);//缓存大小限制

//commonsMultipartResolver.setMaxUploadSizePerFile();//单个文件大小限制

//commonsMultipartResolver.setPreserveFilename();

return

commonsMultipartResolver;

}