spring mvc 文件上传

1. web页面通用

<form action="/Luobov/record/upload" method="post" enctype="multipart/form-data">
    <input type="file" name="uploadfile" />
    <input type="submit" value="upload" />
 </form>

2.pom.xml需加入

       <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>

3. springmvc的配置文件 要加入

    <!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->
    <bean id="multipartResolver"  
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <!-- 默认编码 -->
        <property name="defaultEncoding" value="utf-8" />  
        <!-- 文件大小最大值 -->
        <property name="maxUploadSize" value="10485760000" />  
        <!-- 内存中的最大值 -->
        <property name="maxInMemorySize" value="40960" />  
    </bean> 

4. Controller中处理

@RequestMapping(value = "/upload", method = RequestMethod.POST)
    public ModelAndView upload(
            @RequestParam("uploadfile") CommonsMultipartFile upfile,
            HttpServletRequest req) throws IOException {
        // |获取在Web服务器上的 绝对路径

        System.out.println("come");
        String path = req.getRealPath("/WEB-INF/static/");
        System.out.println(path);
        // |获取输入流
        InputStream is = upfile.getInputStream();
        // |文件输出流
        OutputStream os = new FileOutputStream(new File(path,upfile.getOriginalFilename()));

        System.out.println("come0");
        // |循环写入
        int length = 0;
        byte[] buffer = new byte[128];
        while ((length = is.read(buffer)) != -1) {
            os.write(buffer, 0, length);
        }
        System.out.println("come1");
        is.close();
        os.close();
        // ===渲染===
        System.out.println("come2");
        // ModelAndView mView = new ModelAndView();
        // mView.setViewName("upload");
        // |返回至渲染器
        return null;
    }