文件资源不存放本地，做程序后端开发时可以把他放在阿里云的oss对象存储

1.创建阿里云账号，在控制台找到oss对象存储服务

2.创建bucket，读写权限设置公开

3.个人中心配置AccessKey

 记录好accjeyid值，密钥等

4，springboot启动，配置文件中把4个属性放上去

sky:
 alioss:
    endpoint: ${sky.alioss.endpoint}
    access-key-id: ${sky.alioss.access-key-id}
    access-key-secret: ${sky.alioss.access-key-secret}
    bucket-name: ${sky.alioss.bucket-name}

添加oss依赖

<dependency>
            <groupId>com.aliyun.oss</groupId>
            <artifactId>aliyun-sdk-oss</artifactId>
            <version>3.15.1</version>
        </dependency>

添加文件工具类

package com.edu.utils;

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;

import java.io.ByteArrayInputStream;

@Data
@Slf4j
@AllArgsConstructor
@NoArgsConstructor
public class AliOssUtil {

    private String endpoint;
    private String accessKeyId;
    private String accessKeySecret;
    private String bucketName;


    /**
     * 文件上传
     *
     * @param bytes 文件字节码
     * @param objectName 文件名字
     * @return 返回文件上传路径
     */
    public String upload(byte[] bytes, String objectName) {

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
        try {
            // 创建PutObject请求。
            ossClient.putObject(bucketName, objectName, new ByteArrayInputStream(bytes));
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }

        //文件访问路径规则 https://BucketName.Endpoint/ObjectName
        StringBuilder stringBuilder = new StringBuilder("https://");
        stringBuilder
                .append(bucketName)
                .append(".")
                .append(endpoint)
                .append("/")
                .append(objectName);

        log.info("文件上传到:{}", stringBuilder);

        return stringBuilder.toString();
    }
}

配置类注入4个属性

@Component
@ConfigurationProperties(prefix = "sky.alioss")
@Data
public class AliOssProperties {
    private String endpoint;
    private String accessKeyId;
    private String accessKeySecret;
    private String bucketName;
}

@Configuration
public class Myconfig implements WebMvcConfigurer {
    @Autowired
    private AliOssProperties aliOssProperties;

//    @Bean
//    public PasswordEncoder passwordEncoder() {
//        return new BCryptPasswordEncoder();
//    }
//    @Override
//    public void addInterceptors(InterceptorRegistry registry) {
//        registry.addInterceptor(new LoginInterceptor())
//                .addPathPatterns("/**")
//                .excludePathPatterns("/user/login", "/user/register","/index");
//    }
@Bean
public AliOssUtil aliOssUtil(){
    return new AliOssUtil(aliOssProperties.getEndpoint(),aliOssProperties.getAccessKeyId(),aliOssProperties.getAccessKeySecret(),aliOssProperties.getBucketName());
}

处理文件，前段上传，得到字节码还有文件名，在调用这个接口就上传成功了

这是一个文件处理的简单逻辑层

@Service
@Slf4j
public class CommonServiceImpl implements CommonService {
    @Autowired
    AliOssUtil aliOssUtil;

    @Override
    public String upload(MultipartFile file) {
        String filePath = null;
        try {
            // 原始文件名
            String originalFilename = file.getOriginalFilename();
            if (originalFilename == null || originalFilename.isEmpty()) {
                throw new IllegalArgumentException("文件名不能为空");
            }
            // 截取后缀
            String extension = originalFilename.substring(originalFilename.lastIndexOf("."));
            // 构造新的文件名
            String objectName = UUID.randomUUID() + extension; // 随机文件名
            filePath = aliOssUtil.upload(file.getBytes(), objectName);
            log.info("文件上传成功，路径: {}", filePath); // 添加日志记录
        } catch (IOException e) {
            log.error("文件上传失败:{}", e.getMessage(), e);
            throw new RuntimeException("文件上传失败，请稍后重试");
        }
        return filePath;
    }
}

直接调用这个upload接口就行了