1、文件下载
使用ResponseEntity实现下载文件的功能
@RequestMapping("/testDown") public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException { //获取ServletContext对象 ServletContext servletContext //获取服务器中文件的真实路径 String realPath = servletContext.getRealPath("/static/img/1.jpg"); //创建输入流 InputStream is = new FileInputStream(realPath); //创建字节数组 byte[] bytes = new byte[is.available()]; //将流读到字节数组中 is.read(bytes); //创建HttpHeaders对象设置响应头信息 MultiValueMap<String, String> headers = new HttpHeaders(); //设置要下载方式以及下载文件的名字 headers.add("Content-Disposition", "attachment;filename=1.jpg"); //设置响应状态码 HttpStatus statusCode = HttpStatus.OK; //创建ResponseEntity对象 ResponseEntity<byte[]> responseEntity = new ResponseEntity<>(bytes, headers, statusCode); //关闭输入流 is.close(); return responseEntity; }= session.getServletContext();
2、文件上传
文件上传要求form表单的请求方式必须为post,并且添加属性enctype="multipart/form-data"
SpringMVC中将上传的文件封装到MultipartFile对象中,通过此对象可以获取文件相关信息
上传步骤:
a>添加依赖:
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -- > <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency>
b>在SpringMVC的配置文件中添加配置:
<!--必须通过文件解析器的解析才能将文件转换为MultipartFile对象--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> </bean>
c>控制器方法:
@RequestMapping("/testUp") public String testUp(MultipartFile photo, HttpSession session) throws IOException { //获取上传的文件的文件名 String fileName = photo.getOriginalFilename(); //处理文件重名问题 String hzName = fileName.substring(filefileName = UUID.randomUUID().toString() + hzName; //获取服务器中photo目录的路径 ServletContext servletContext = session.getServletContext(); String photoPath = servletContext.getRealPath("photo"); File file = new File(photoPath); if(!file.exists()){ file.mkdir(); } String finalPath = photoPath + File.separator + fileName; //实现上传功能 photo.transferTo(new File(finalPath)); return "success"; } Name.lastIndexOf("."));
标签:文件,String,photo,ResponseEntity,new,上传,下载 From: https://www.cnblogs.com/ai377377/p/16804190.html