利用SpirngBoot实现文件上传功能( 二 ) 零、本篇要点介绍SpringBoot对文

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四、SpringBoot的Restful风格，返回url/** * 文件上传 * * @author Summerday */@RestControllerpublic class FileUploadRestController {/*** 文件名长度*/private static final int DEFAULT_FILE_NAME_LENGTH = 100;/*** 允许的文件类型*/private static final String[] ALLOWED_EXTENSIONS = {"jpg", "img", "png", "gif"};/*** 项目路径*/private static final String UPLOADED_FOLDER = System.getProperty("user.dir");@PostMapping("/restUpload")public Map singleFileUpload(@RequestParam("file") MultipartFile file) throws Exception {if (file.isEmpty()) {throw new Exception("文件为空!");}String filename = upload(file);String url = "/upload/" + filename;Map map = new HashMap<>(2);map.put("msg","上传成功");map.put("url",url);return map;}/*** 上传方法*/private String upload(MultipartFile file) throws Exception {int len = file.getOriginalFilename().length();if (len > DEFAULT_FILE_NAME_LENGTH) {throw new Exception("文件名超出限制!");}String extension = getExtension(file);if(!isValidExtension(extension)){throw new Exception("文件格式不正确");}// 自定义文件名String filename = getPathName(file);// 获取file对象File desc = getFile(filename);// 写入filefile.transferTo(desc);return filename;}/*** 获取file对象*/private File getFile(String filename) throws IOException {File file = new File(UPLOADED_FOLDER + "/" + filename);if(!file.getParentFile().exists()){file.getParentFile().mkdirs();}if(!file.exists()){file.createNewFile();}return file;}/*** 验证文件类型是否正确*/private boolean isValidExtension(String extension) {for (String allowedExtension : ALLOWED_EXTENSIONS) {if(extension.equalsIgnoreCase(allowedExtension)){return true;}}return false;}/*** 此处自定义文件名,uuid + extension*/private String getPathName(MultipartFile file) {String extension = getExtension(file);return UUID.randomUUID().toString() + "." + extension;}/*** 获取扩展名*/private String getExtension(MultipartFile file) {String originalFilename = file.getOriginalFilename();return originalFilename.substring(originalFilename.lastIndexOf('.') + 1);}}原文链接：
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