SpringBoot解决文件上传，返回可访问路径

问题描述：SpringBoot项目中需要上传文件到当前服务器的磁盘（即物理地址），返回可访问的路径给前端。前端利用路径显示文件内容。 开发环境：SpringBoot2.0以上、JDK 1.8

1.在springboot中加入下面代码

@Value("${file.uploadFolder}") private String uploadFolder; @Bean MultipartConfigElement multipartConfigElement() { MultipartConfigFactory factory = new MultipartConfigFactory(); factory.setLocation(uploadFolder); return factory.createMultipartConfig(); }

自定义MVC文件映射

@Configuration public class WebMvcConfig implements WebMvcConfigurer { @Value("${file.staticAccessPath}") private String staticAccessPath; @Value("${smas.captrue.image.path}") private String captureImagePath; @Value("${file.uploadFolder}") private String uploadFolder; @Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/**").allowedOrigins("*").allowCredentials(true).allowedMethods("*").maxAge(3600); } @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler(staticAccessPath).addResourceLocations("file:" + uploadFolder + captureImagePath); } }

文件上传

@RequestMapping(path = "/files") @RestController public class FileController { @Value("${smas.captrue.image.path}") private String captureImagePath; @Value("${file.uploadFolder}") private String uploadFolder; @Value("${file.uri}") private String uri; @RequestMapping(value = "/upload") public FileVo emailUpload(HttpServletRequest request) { MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; Map<String, MultipartFile> files = multipartRequest.getFileMap(); String path_deposit = uploadFolder + captureImagePath; List<String> urls = new ArrayList<>(); for (Map.Entry<String, MultipartFile> entry : files.entrySet()) { try { String fileName = entry.getValue().getOriginalFilename(); FileHandleUtil.upload(entry.getValue().getInputStream(), path_deposit, fileName); urls.add(FileHandleUtil.getServerIPPort(request) + File.separator + uri + fileName); } catch (IOException e) { throw new SmasException("文件读取异常"); } } FileVo fileVo = new FileVo(); fileVo.setErrno("0"); fileVo.setData(urls); return fileVo; } }

在application.properties中增加以下配置

##图片临时路径 #单个数据的大小 spring.servlet.multipart.maxFileSize=10Mb #总数据的大小 spring.servlet.multipart.maxRequestSize=10Mb #文件上传后存储路径：D:\home\capture\5\*.jpg(具体配置如下) #访问Url:http://ip:port/smas/upload/* #文件上传目录(window是d/e/f盘， linux是/)（注意Linux和Windows上的目录结构不同） #file.uploadFolder=/ file.uploadFolder=d:// # 设备截图文件保存路径(文件存在具体的文件夹的路径) smas.captrue.image.path=home/capture/ #静态资源对外暴露的访问路径(访问图片的路径) file.staticAccessPath=/upload/** #浏览器访问 file.uri=/upload/

文件处理工具类

public class FileHandleUtil { /** * 上传单个文件 * * @param inputStream 文件流 * @param path 文件路径，如：image/ * @param filename 文件名，如：test.jpg * @return 成功：上传后的文件访问路径，失败返回：null */ public static String upload(InputStream inputStream, String path, String filename) { //创建文件夹 createDirIfNotExists(path); //存文件 File uploadFile = new File(path, filename); try { FileUtils.copyInputStreamToFile(inputStream, uploadFile); } catch (IOException e) { throw new SmasException("文件上传失败！"); } return uploadFile.getPath(); } /** * 创建文件夹路径 */ private static void createDirIfNotExists(String path) { File file = new File(path); if (!file.exists()) { file.mkdirs(); } } /** * 删除文件 * * @param path 文件访问的路径upload开始 如： /upload/image/test.jpg * @return true 删除成功； false 删除失败 */ public static boolean delete(String path) { File file = new File(path); return file.exists() == true ? file.delete() : true; } /** * 获取服务部署根路径 http:// + ip + port * * @param request * @return */ public static String getServerIPPort(HttpServletRequest request) { //+ ":" + request.getServerPort() return request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort(); } }

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