文件上传

@Controller
@RequestMapping("/user")
public class UserController {
 
    private static final Logger logger = LoggerFactory.getLogger(UserController.class);
 
    @Value("${community.path.upload}")
    private String uploadPath;
 
    @Value("${community.path.domain}")
    private String domain;
 
    @Value("${server.servlet.context-path}")
    private String contextPath;
 
    @Autowired
    private UserService userService;
 
    @Autowired
    private HostHolder hostHolder;
 
    @LoginRequired
    @RequestMapping(path = "/setting", method = RequestMethod.GET)
    public String getSettingPage() {
        return "/site/setting";
    }
 
    @LoginRequired
    @RequestMapping(path = "/upload", method = RequestMethod.POST)
    public String uploadHeader(MultipartFile headerImage, Model model) {
        if (headerImage == null) {
            model.addAttribute("error", "您还没有选择图片!");
            return "/site/setting";
        }
 
        String fileName = headerImage.getOriginalFilename();
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        if (StringUtils.isBlank(suffix)) {
            model.addAttribute("error", "文件的格式不正确!");
            return "/site/setting";
        }
 
        // 生成随机文件名
        fileName = CommunityUtil.generateUUID() + suffix;
        // 确定文件存放的路径
        File dest = new File(uploadPath + "/" + fileName);
        try {
            // 存储文件
            headerImage.transferTo(dest);
        } catch (IOException e) {
            logger.error("上传文件失败: " + e.getMessage());
            throw new RuntimeException("上传文件失败,服务器发生异常!", e);
        }
 
        // 更新当前用户的头像的路径(web访问路径)
        // http://localhost:8080/community/user/header/xxx.png
        User user = hostHolder.getUser();
        String headerUrl = domain + contextPath + "/user/header/" + fileName;
        userService.updateHeader(user.getId(), headerUrl);
 
        return "redirect:/index";
    }
 
    @RequestMapping(path = "/header/{fileName}", method = RequestMethod.GET)
    public void getHeader(@PathVariable("fileName") String fileName, HttpServletResponse response) {
        // 服务器存放路径
        fileName = uploadPath + "/" + fileName;
        // 文件后缀
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        // 响应图片
        response.setContentType("image/" + suffix);
        try (
                FileInputStream fis = new FileInputStream(fileName);
                OutputStream os = response.getOutputStream();
        ) {
            byte[] buffer = new byte[1024];
            int b = 0;
            while ((b = fis.read(buffer)) != -1) {
                os.write(buffer, 0, b);
            }
        } catch (IOException e) {
            logger.error("读取头像失败: " + e.getMessage());
        }
    }
 
}

静态页面：

<form class="mt-5" method="post" enctype="multipart/form-data" th:action="@{/user/upload}">
					<div class="form-group row mt-4">
						<label for="head-image" class="col-sm-2 col-form-label text-right">选择头像:</label>
						<div class="col-sm-10">
							<div class="custom-file">
								<input type="file" th:class="|custom-file-input ${error!=null?'is-invalid':''}|"
									   id="head-image" name="headerImage" lang="es" required="">
								<label class="custom-file-label" for="head-image" data-browse="文件">选择一张图片</label>
								<div class="invalid-feedback" th:text="${error}">
									该账号不存在!
								</div>
							</div>
						</div>
					</div>
					<div class="form-group row mt-4">
						<div class="col-sm-2"></div>
						<div class="col-sm-10 text-center">
							<button type="submit" class="btn btn-info text-white form-control">立即上传</button>
						</div>
					</div>
				</form>

标签：文件,String,private,fileName,user,path,上传,suffix
来源： https://www.cnblogs.com/youngchen/p/16364626.html