使用Minio上传和下载图片资源，注意这里：<font color=”#ff0000″>用户头像是在/userAvatar路径下</font>

总结：

1. <font color=”#ff0000″>尽量不要使用路径参数，容易与springboot产生歧义</font>
2. <font color=”#9bbb59″>如果你是用了Rebel热重载类，springSecurity的配置可能不生效，请正常重启后端服务</font>
3. 请求图片接口乱码：在response中设置response.setContentType("image/png");即可

springSecurity 配置了放行 , 但是还是被拦截了

 authorizeHttpRequests(authorizationManagerRequestMatcherRegistry -> {  
                    authorizationManagerRequestMatcherRegistry  
                            .requestMatchers("/api/image/*").permitAll()  
                            .requestMatchers("/api/auth/**", "/error").permitAll()  
                            // 对于其他所有请求，需要进行身份验证  
                            .anyRequest().authenticated();  
                })

对应的controller：

@RestController  
@Slf4j  
@RequestMapping("/api/image")  
public class ImageController {  
    @Resource  
    ImageService imageService;  
  
    @PostMapping("/avatar")  
    public void uploadAvatar(@RequestParam("file") MultipartFile avatar,  
                                         @RequestAttribute(Const.ATTR_USER_ID) int userId) {  
        //上传头像逻辑
    }  
  
    @GetMapping("/{imageName}")  
    public RestBean<String> getImage(HttpServletResponse response,@PathVariable String imageName){  
        return imageService.getImage(response,imageName);  
    }  
}

这里访问没有权限，当访问http://localhost:8080/api/image/userAvatar/11ad8f050eaf43f2ba5c0e5c4b7e28d4.png时，springboot会认为访问的是 /api/image/userAvatar/ 接口，而不是放行的/api/image/ 接口

到这里就比较清楚了，把路径参数改成普通的get参数

取消路径参数 修改为普通get参数

修改后controller：

@GetMapping("/get")  
public void getImage(HttpServletResponse response,@RequestParam String imageName){ 
    imageService.getImage(response,imageName);  
}

接口乱码

http://localhost:8080/api/image/get?imageName=userAvatar/11ad8f050eaf43f2ba5c0e5c4b7e28d4.png
OK也是成功地访问了，但是请求后出现乱码

 try (ServletOutputStream outputStream = response.getOutputStream();) {  
            GetObjectResponse imageResponse = minioClient.getObject(args);  
//            response.setHeader("Cache-Control", "max-age=2592000");  
            response.setContentType("image/png");  
            IOUtils.copy(imageResponse, outputStream);  
        } catch (Exception e) {

完整代码

  @Override
    public void getImage(HttpServletResponse response, String imageName) {
        if (imageName.length() <= 13) {
            response.setStatus(404);
            return;
        }
        GetObjectArgs args = GetObjectArgs.builder()
                .bucket(BUCKET)
                .object(imageName)
                .build();
        log.info("getImage ：{}", args);
        try (ServletOutputStream outputStream = response.getOutputStream()) {
            GetObjectResponse imageResponse = minioClient.getObject(args);
//            response.setHeader("Cache-Control", "max-age=2592000");
            response.setContentType("image/png");
            IOUtils.copy(imageResponse, outputStream);
        } catch (Exception e) {
            log.error("传输过程中出现错误：" + e);
            response.setStatus(500);
            return;
        }
        response.setStatus(200);
    }