时间:2021-07-01 10:21:17 帮助过:12人阅读
2、然后,在applicatinContext.xml中添加上传和下载的配置文件,如下:
<!-- 文件上传的配置 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件,而是所有文件的容量之和 --> <property name="maxUploadSize" value="200000"/> </bean> <!-- 该异常是SpringMVC在检查上传的文件信息时抛出来的,而且此时还没有进入到Controller方法中 --> <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <property name="exceptionMappings"> <props> <!-- 遇到MaxUploadSizeExceededException异常时,自动跳转到WebContent目录下的error.jsp页面 --> <prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">error</prop> </props> </property> </bean>
3、好了,最基础的配置就好了,接下来jsp页面:upload.jsp
1 <form action="upload.do" method="post" enctype="multipart/form-data"> 2 文件1: <input type="file" name="myfiles"/><br/> 3 文件2: <input type="file" name="myfiles"/><br/> 4 文件3: <input type="file" name="myfiles"/><br/> 5 <input type="submit" value="上传"> 6 </form>
4、Controller中对应的java代码:
@RequestMapping("/upload.do") public String upload(@RequestParam MultipartFile[] myfiles,HttpServletRequest request) throws IOException { for(MultipartFile file : myfiles){ //此处MultipartFile[]表明是多文件,如果是单文件MultipartFile就行了 if(file.isEmpty()){ System.out.println("文件未上传!"); } else{ //得到上传的文件名 String fileName = file.getOriginalFilename(); //得到服务器项目发布运行所在地址 String path1 = request.getSession().getServletContext().getRealPath("image")+File.separator; // 此处未使用UUID来生成唯一标识,用日期做为标识 String path = path1+ new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())+ fileName; //查看文件上传路径,方便查找 System.out.println(path); //把文件上传至path的路径 File localFile = new File(path); file.transferTo(localFile); } } return "uploadSuccess"; }
这样就可以把网页上选择的图片上传上去了.
下载成功了!
5、文件下载download.jsp:此处为了测试,我直接把用户名当作参数传过去:
<a href="download.do?fileName=2016082312271111111.jpg">下载</a>
6、Controller:
@RequestMapping("/download") public String download(String fileName, HttpServletRequest request, HttpServletResponse response) { response.setCharacterEncoding("utf-8"); response.setContentType("multipart/form-data"); response.setHeader("Content-Disposition", "attachment;fileName=" + fileName); try { String path = request.getSession().getServletContext().getRealPath ("image")+File.separator; InputStream inputStream = new FileInputStream(new File(path + fileName)); OutputStream os = response.getOutputStream(); byte[] b = new byte[2048]; int length; while ((length = inputStream.read(b)) > 0) { os.write(b, 0, length); } // 这里主要关闭。 os.close(); inputStream.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } // 返回值要注意,要不然就出现下面这句错误! //java+getOutputStream() has already been called for this response return null; }
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