springboot整合oss 上传与下载

的实现步骤是什么？

为了实现Spring Boot整合OSS上传与下载，我们可以使用Aliyun OSS SDK。实现步骤如下：

1. 首先，在pom.xml中添加OSS SDK的依赖：

<dependency>
    <groupId>com.aliyun.oss</groupId>
    <artifactId>aliyun-sdk-oss</artifactId>
    <version>2.9.0</version>
</dependency>

2. 然后在application.yml配置文件中添加OSS的配置:

spring:
  oss:
    endpoint: oss-cn-hangzhou.aliyuncs.com
    access-key: xxxx
    secret-key: xxxx
    bucket-name: xxxx

3. 创建一个OSS配置类：

@Configuration
@ConfigurationProperties(prefix = "spring.oss")
public class OSSConfig {
    private String endpoint;
    private String accessKey;
    private String secretKey;
    private String bucketName;

    // getter and setter methods
}

4. 创建一个OSS客户端：

@Bean
public OSSClient ossClient(OSSConfig ossConfig) {
    return new OSSClient(ossConfig.getEndpoint(), ossConfig.getAccessKey(), ossConfig.getSecretKey());
}

5. 创建一个UploadService：

@Service
public class UploadService {
    @Autowired
    private OSSClient ossClient;

    public String uploadFile(MultipartFile file) throws IOException {
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName = UUID.randomUUID().toString() + suffix;

        ossClient.putObject("bucket-name", fileName, new ByteArrayInputStream(file.getBytes()));
        return fileName;
    }
}

6. 创建一个DownloadService：

@Service
public class DownloadService {
    @Autowired
    private OSSClient ossClient;

    public byte[] downloadFile(String fileName) throws IOException {
        OSSObject object = ossClient.getObject("bucket-name", fileName);
        InputStream inputStream = object.getObjectContent();
        return IOUtils.toByteArray(inputStream);
    }
}

这样，就完成了Spring Boot整合OSS上传与下载的实现。