springMVC的文件上传与下载

最新推荐文章于 2022-03-15 22:15:05 发布

原创最新推荐文章于 2022-03-15 22:15:05 发布 · 161 阅读

0 ·

CC 4.0 BY-SA版权

spring 专栏收录该内容

23 篇文章

订阅专栏

本文介绍了一个使用Spring MVC实现的文件上传与下载功能。通过示例代码展示了如何配置MultipartResolver来支持文件上传，如何处理上传的文件并保存到服务器，以及如何提供文件下载服务。同时介绍了依赖项commons-fileupload的版本。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

<form action="testFileUpload" method="post" enctype="multipart/form-data">
		File:<input type="file" name="file">
		Desc:<input type="text" name="desc">
		<input type="submit" value="submit">
	</form>
	
	<a href="downloadFile?fileName=上传测试2.txt">下载</a>

@RequestMapping("/testFileUpload")
	public String testFileUpload(@RequestParam("file") MultipartFile file, @RequestParam("desc") String desc,
			HttpServletRequest request) throws Exception {
		System.out.println(file.getOriginalFilename());
		// System.out.println(file.getName());
		System.out.println(desc);
		System.out.println(file.getInputStream());

		if (!file.isEmpty()) {
			String contextPath = request.getServletContext().getRealPath("/upload");
			String originalFilename = file.getOriginalFilename();
			File filePath = new File(contextPath);

			if (!filePath.exists()) {
				filePath.mkdirs();
			}

			file.transferTo(new File(contextPath + File.separator + originalFilename));

		} else {
			throw new Exception("请选择上传的文件！");
		}

		return "success";
	}
	
	@RequestMapping("/downloadFile")
	public ResponseEntity<byte[]> downloadFile(HttpServletRequest request, @RequestParam("fileName") String fileName) throws IOException {
		String realPath = request.getServletContext().getRealPath("/upload");
		File downLoadFile = new File(realPath + File.separator + fileName);
		byte[] body = FileUtils.readFileToByteArray(downLoadFile);
		HttpHeaders headers = new HttpHeaders();
		headers.setContentDispositionFormData("attachment", fileName);
		HttpStatus status = HttpStatus.CREATED;
		
		ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(body, headers, status);
		return response;
	}

springMVC.xml
	<!-- 配置MultipartResolver -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="UTF-8"></property>
		<property name="maxUploadSize" value="1024000"></property>
	</bean>

pom.xml
<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.3</version>
		</dependency>