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1. 配置 application.yml

在 application.yml 中配置阿里云 OSS 的相关信息：

aliyun:oss:endpoint: "<您的OSS地域节点>" # 示例: oss-cn-hangzhou.aliyuncs.comaccessKeyId: "<您的AccessKeyId>"accessKeySecret: "<您的AccessKeySecret>"bucketName: "<您的Bucket名称>"

2. 创建 AliOssConfig 配置类

在后端创建一个配置类用于初始化阿里云 OSS 客户端实例。

package com.sky.properties;import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;@Component
@ConfigurationProperties(prefix = "sky.alioss")
@Data
public class AliOssProperties {private String endpoint;private String accessKeyId;private String accessKeySecret;private String bucketName;}

• @ConfigurationProperties 注解通过 前缀匹配，将配置文件（如 application.yml 或 application.properties）中的属性自动绑定到类的字段。
• 需要使用 @Component 或其他形式将类注入到 Spring 容器中。

package com.sky.config;import com.sky.properties.AliOssProperties;
import com.sky.utils.AliOssUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** 配置类，用于创建AliOssUtil*/
@Configuration
@Slf4j
public class OssConfiguration {@Bean@ConditionalOnMissingBeanpublic AliOssUtil aliOssUtil(AliOssProperties aliOssProperties){log.info("开始创建阿里云文件上传工具类对象{}：",aliOssProperties);return  new AliOssUtil(aliOssProperties.getEndpoint(),aliOssProperties.getAccessKeyId(),aliOssProperties.getAccessKeySecret(),aliOssProperties.getBucketName());}
}

• 动态创建 AliOssUtil 工具类对象
  使用配置类方式来初始化 AliOssUtil 工具类，并将配置文件中的属性通过 AliOssProperties 传递给工具类。

• 自动注入 AliOssProperties
  方法参数 AliOssProperties aliOssProperties 会自动从 Spring 容器中注入，因为 AliOssProperties 类已经被标注了 @Component 和 @ConfigurationProperties。

• 便于工具类的全局复用
  通过将 AliOssUtil 注册为 Bean，其他任何需要用到文件上传的地方都可以通过自动注入（@Autowired）的方式获取实例。

3. 创建 AliOssUtil 工具类

封装一个工具类来处理文件上传的核心逻辑。直接找搬就好了

package com.sky.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.extern.slf4j.Slf4j;
import java.io.ByteArrayInputStream;@Data
@AllArgsConstructor
@Slf4j
public class AliOssUtil {private String endpoint;private String accessKeyId;private String accessKeySecret;private String bucketName;/*** 文件上传** @param bytes* @param objectName* @return*/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/ObjectNameStringBuilder stringBuilder = new StringBuilder("https://");stringBuilder.append(bucketName).append(".").append(endpoint).append("/").append(objectName);log.info("文件上传到:{}", stringBuilder.toString());return stringBuilder.toString();}
}

4. 创建 FileUploadController 控制器

编写 Controller 层接口，供前端调用。

package com.sky.controller.admin;import com.sky.constant.MessageConstant;
import com.sky.result.Result;
import com.sky.utils.AliOssUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;import java.io.IOException;
import java.util.UUID;@RestController
@RequestMapping("/admin/common")
@Api(tags = "通用接口")
@Slf4j
public class CommonController {@Autowiredprivate AliOssUtil  aliOssUtil;/*** 文件上传* @param file* @return*/@PostMapping("/upload")@ApiOperation("文件上传")public Result<String> upload(MultipartFile file){log.info("文件上传 ：{}",file);//try {// 防止文件重命到时文件覆盖，需要使用UUID，将文件重命名// 原始文件名String originalFilename = file.getOriginalFilename();//截取原始文件的后缀名String extention = originalFilename.substring(originalFilename.lastIndexOf("."));// 构造新文件名称String objectName = UUID.randomUUID().toString() + extention;// 文件的请求路径String filePath = aliOssUtil.upload(file.getBytes(), objectName);return Result.success(filePath);} catch (IOException e) {log.error("文件上传失败 ：" ,e);}return Result.error(MessageConstant.UPLOAD_FAILED);}
}