<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!--设置字符集编码-->
    <property name="defaultEncoding" value="UTF-8"/>
    <!--设置最大上传的容量大小，也就是文件的大小-->
    <property name="maxUploadSize" value="102400"/>
</bean>

/**
 * @author: BNTang
 */
@Controller
public class MyFirstController {
    @RequestMapping("/fileUpload")
    @ResponseBody
    public String fileUpload(@RequestParam("file") CommonsMultipartFile file, HttpSession httpSession) throws IOException {
        // form表单中的name属性值
        System.out.println(file.getName());

        // 文件大小
        System.out.println(file.getSize());

        // 文件类型
        System.out.println(file.getContentType());

        // 文件名
        System.out.println(file.getOriginalFilename());

        ServletContext servletContext = httpSession.getServletContext();

        String realPath = servletContext.getRealPath("/upload");

        File upload = new File(realPath);

        if (!upload.exists()) {
            upload.mkdirs();
        }

        String fileName = file.getOriginalFilename();

        upload = new File(upload + "/" + fileName);

        file.transferTo(upload);
        return "success";
    }
}