流程

• avatar_dir：请求图片在服务端的存放路径
• user.dir：项目根目录
  

效果

静态资源访问

1. application.yml
   设置静态文件存储路径

   custom:upload:avatar_dir: ${user.dir}/avatar_dir/avatar_dir_name: avatar_dir
   

2. FileUploadConfig
   application.yml 信息读取配置类

   @Data
   @Configuration
   @ConfigurationProperties(prefix = "custom.upload")
   public class FileUploadConfig {private String avatarDir;private String avatarDirName;
   }
   

3. 静态资源访问配置类

   @Configuration
   public class WebConfig implements WebMvcConfigurer {@AutowiredFileUploadConfig uploadConfig;@Overridepublic void addResourceHandlers(ResourceHandlerRegistry registry) {File file = new File(uploadConfig.getAvatarDir());String path = "file:" + file + File.separator;// 匹配 http://ip:port/avatar_dir/ 下的所有文件registry.addResourceHandler("/avatar_dir/**")// 实际静态文件地址.addResourceLocations(path);}
   }
   

Service

@Service
public interface FileService {// 获取图像 Urlpublic Result<String> getImageUrl(User user, String host, int port);// 路径拼接public String joinPaths(String... paths);
}

ServiceImpl

• http://ip:port/静态文件存储路径/文件名

  String imageUrl = String.format("http://%s:%d/%s", host, port, joinPaths(uploadConfig.getAvatarDirName(), avatar)
  );
  

• 实现代码

  @Service
  public class FileServiceImpl implements FileService {@AutowiredFileUploadConfig uploadConfig;@AutowiredIUserService userService;// 路径拼接@Overridepublic String joinPaths(String... paths) {Path resultPath = Paths.get("");for (String path : paths) {resultPath = resultPath.resolve(path);}return resultPath.toString();}// 判断文件是否存在private Boolean isUserAvatarExists(String avatar) {String path = joinPaths(uploadConfig.getAvatarDir(), avatar);File filePath = new File(path);return filePath.exists();}// 获取图像 Url@Overridepublic Result<String> getImageUrl(User user, String host, int port) {// 用户头像的文件名唯一，并保存在了数据库中，avatar = xxx.pngString avatar = this.userService.getById(user.getUserId()).getAvatar();if (isUserAvatarExists(avatar)) {String imageUrl = String.format("http://%s:%d/%s", host, port, joinPaths(uploadConfig.getAvatarDirName(), avatar));return Result.successfulResult("获取成功", imageUrl);}return Result.errorResult("文件丢失");}
  }
  

Controller

@Tag(name = "文件上传接口")
@RestController
@RequestMapping("/sign/file")
public class FileUploadController {@AutowiredFileService fileService;@Operation(summary = "获取图片 URL")@PostMapping("/image/get")public Result<String> getImageUrl(@RequestBody User user) {URI currentUri = ServletUriComponentsBuilder.fromCurrentRequestUri().build().toUri();// currentUri.getHost() 获取请求 IP，如 localhost// currentUri.getPort() 获取请求 端口号，如 8080return fileService.getImageUrl(user, currentUri.getHost(), currentUri.getPort());}
}