使用springmvc实现文件上传

    <!-- 配置文件解析器，id必须为multipartResolver-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="10485760" />
    </bean>

    <h3>springmvc：文件上传</h3>
    <form action="file/upload2" method="post" enctype="multipart/form-data">
        选择文件：<input type="file" name="upload2" /><br/>
        <input type="submit" value="上传" />
    </form>

    /**
     * SpringMVC文件上传
     * @param request
     * @return
     * @throws Exception
     * MultipartFile upload2: upload2为提交文件按钮的name值，表示文件上传项
     */
    @RequestMapping("/upload2")
    public String fileupload1(HttpServletRequest request, MultipartFile upload2) throws Exception {
        System.out.println("springmvc文件上传");

        // 使用fileupload组件完成组件上传
        // 上传的位置
        // request.getSession().getServletContext():拿到最大的域对象,getRealPath()：拿到某路径下的绝对路径
        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        // 判断该路径是否存在
        File file = new File(path);
        if (!file.exists()){
            // 创建文件夹
            file.mkdirs();
        }

        // springmvc不需要自己解析request
        // 获取上传文件名
        String filename = upload2.getOriginalFilename();
        // 把文件的名称设置为唯一值,uuid
        String uuid = UUID.randomUUID().toString().replace("-", "");
        filename = uuid + "_" + filename;
        // 完成文件上传
        upload2.transferTo(new File(file,filename));

        return "success";
    }