springmvc实现文件上传

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8"></property>
        <property name="maxUploadSize" value="10485760000"></property>
        <property name="maxInMemorySize" value="40960"></property>
    </bean>

<form action="upload.do" method="post" enctype="multipart/form-data">
file:<input type="file" name="file" /><input type="submit" value="submit"/>
</form>

public class FileuploadController {
    @RequestMapping("/upload")
    public String fileupload(@RequestParam("file")CommonsMultipartFile file, HttpServletRequest req) throws IOException{
        //获取文件名 file.getOriginalFilename();
        String path = req.getRealPath("/fileupload");//获取上传文件的路径
        InputStream is = file.getInputStream();
        OutputStream os = new FileOutputStream(new File(path,file.getOriginalFilename()));
        int len = 0;
        byte[] buffer = new byte[400];
        while((len=is.read(buffer)) != -1){
            os.write(buffer, 0, len);
        }
        os.close();
        is.close();
        return "/index.jsp";
    }
}