开发环境说明：JDK 17 + SpringBoot 2.7.12

一、导入相关SKD坐标

<dependency>
    <groupId>com.aliyun.oss</groupId>
    <artifactId>aliyun-sdk-oss</artifactId>
    <version>3.13.0</version>
</dependency>

二、获取AccessKey和Secret

获取地址：ram.console.aliyun.com/manage/ak

三、文件上传代码实现

@RestController
@RequestMapping("/file")
public class UploadController {
    // 地域 填写自己的
    private static final String endpoint = "";
    // key 填写自己的
    private static final String accessKeyId = "";
    // secret 填写自己的
    private static final String accessKeySecret = "";
    // bucket 填写自己的
    private static final String bucketName = "";

    @PostMapping("/upload")
    public String uploadImage(@RequestParam("file") MultipartFile file) {

        if (file.isEmpty()) {
            throw new RuntimeException("文件不能为空!");
        }

        // 校验文件上传类型，根据需求自定义
        List<String> list = List.of(".jpg", ".png");

        String filename = file.getOriginalFilename();
        String type = filename.substring(filename.lastIndexOf('.'));

        if (!list.contains(type)) {
            throw new RuntimeException("文件类型错误!");
        }

        // note-img/ 是bucket下文件夹的名称
        String objectName = "note-img/" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmssS")) + type;


        OSS ossClient = new OSSClientBuilder()
                .build("https://" + endpoint, accessKeyId, accessKeySecret);

        try {
            PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName, file.getInputStream());
            ossClient.putObject(putObjectRequest);
            // 返回上传结果 也就是图片的访问地址
            return "https://" + bucketName + "." + endpoint + "/" + objectName;
        } catch (IOException e) {
            throw new RuntimeException("图片上传失败：" + e.getMessage());
        } finally {
            ossClient.shutdown();
        }
    }
}