SpringMVC整合Mybatis之文件上传与下载

工程结构

第一步：

导入commons-fileupload-1.3.1.jar和commons-io-2.4.jar以及SpringMVC与Mybatis的整合jar包

第二步：在applicationContext.xml中配置文件上传的bean

<!-- 配置文件上传 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><property name="maxUploadSize"><!-- 最大上传大小：5M --><value>5242880</value></property></bean>

单文件上传

index.jsp

<!-- 由于上传文件，数据类型是复合类型，所以enctype="multipart/form-data -->  单文件上传<br/><br/>  <form action="/springmvc_mybatis_test12_upload/test_upload.action" method="post" enctype="multipart/form-data">  <input type="file" name="multipartFile">  <input type="submit" value="上传">  </form>

控制器Upload_Download.java

//单文件上传，参数必须是MultipartFile类型,用来接收上传的文件@RequestMapping("test_upload.action")public String test_upload(MultipartFile multipartFile) throws Exception{if(multipartFile != null){//文件上传的保存路径String path="F:\\";//图片的原始名称（不含路径）String origanlFileName = multipartFile.getOriginalFilename();//上传的图片的保存的新名称，随机生成文件名称+.jpgString newFileName = UUID.randomUUID()+origanlFileName.substring(origanlFileName.lastIndexOf("."));File file = new File(path+newFileName);//将内存的数据写到磁盘上multipartFile.transferTo(file);}return "/WEB-INF/jsp/success.jsp";}

多文件上传：

index.jsp

  <form action="/springmvc_mybatis_test12_upload/test_uploadMoreFile.action" method="post" enctype="multipart/form-data">  <!-- 上传多个文件，用List<MultipartFile> pic接收 -->  <input type="file" name="pic[0]"><br/><br/>  <input type="file" name="pic[1]"><br/><br/>  <input type="file" name="pic[2]"><br/><br/>  <input type="file" name="pic[3]"><br/><br/>  <input type="submit" value="多文件上传">  </form>

单文件上传时，Controller方法中的参数是MultipartFile类型接收上传的文件的信息，多文件上传时，可以自定义包装类将MultipartFile类型进行包装

MultipartFiles.java

/* * 上传多个文件，每个文件都用Controller方法中的MultipartFiles类型的形参接收，所以自定义pojo包装类 * */public class MultipartFiles {private List<MultipartFile> pic;//用List接收,每个文件对应一个MultipartFilepublic List<MultipartFile> getPic() {return pic;}public void setPic(List<MultipartFile> pic) {this.pic = pic;}}

Upload_Download.java

//多文件上传,MultipartFiles是自定义包装类，用List<MultipartFile>接收@RequestMapping("/test_uploadMoreFile.action")public String test_uploadMoreFile(MultipartFiles multipartFiles) throws Exception{List<MultipartFile> list = multipartFiles.getPic();//得到上传的文件链表for(MultipartFile multipartFile:list){//上传图片的保存路径String path = "F:\\";//图片的原始名称（不含路径）String origanlFileName = multipartFile.getOriginalFilename();//新图片的名称,随机生成文件名称+.jpgString newFileName = UUID.randomUUID()+origanlFileName.substring(origanlFileName.lastIndexOf("."));//新图片File file = new File(path+newFileName);//将内存中的数据写入磁盘multipartFile.transferTo(file);}return "/WEB-INF/jsp/success.jsp";}

文件下载

Upload_Download.java

//文件下载//请求<a href="/springmvc_mybatis_test12_upload/test_download.action?filename=赵奕欢.jpg">点击下载资源</a>@RequestMapping("/test_download.action")//String filename 是请求参数public String test_download(HttpServletRequest request,HttpServletResponse response,String filename) throws Exception{filename = new String(filename.getBytes("iso-8859-1"),"UTF-8");//get提交，修改编码String path = request.getRealPath("/WEB-INF/picture/"+filename);//得到资源在硬盘上的绝对的路径File file = new File(path);response.setCharacterEncoding("UTF-8");filename = URLEncoder.encode(filename, "UTF-8");//将中文转为浏览器可认识的编码response.setHeader("content-disposition", "attachment;filename="+filename);//设置响应头为文件下载response.setContentLength((int)file.length());int len = 0;byte []buffer = new byte[1024];InputStream is = new FileInputStream(file);OutputStream os= response.getOutputStream();//向浏览器写数据while((len = is.read(buffer)) != -1){os.write(buffer,0,len);}is.close();os.close();return null;//一定要返回null,执行后不跳转}