这是图片

创建阿里云上传图片工具类

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package com.example.bigevent.util;
import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.PutObjectRequest;
import com.aliyun.oss.model.PutObjectResult;
import java.io.FileInputStream;
import java.io.InputStream;
public class AliOssUtil {
    private static final String BUCKET_NAME = "big-eventsfeng";
    private static final String ENDPOINT = "https://oss-cn-beijing.aliyuncs.com";
    private static final String ACCESS_KEY_ID = "LTAI5tRTZb2wyzYGfX3o8t1Q";
    private static final String ACCESS_KEY_SECRET ="W924sKtF4wsOmP3mT38l79r31kLDsC";
        public static String uploadFile(String objectName,InputStream inputStream) throws Exception {
            // Endpoint以华东1（杭州）为例，其它Region请按实际情况填写。

            // 从环境变量中获取访问凭证。运行本代码示例之前，请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。

//            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填写Bucket名称，例如examplebucket。

            // 填写Object完整路径，完整路径中不能包含Bucket名称，例如exampledir/exampleobject.txt。
//            String objectName = "exampledir/exampleobject.txt";
            // 填写本地文件的完整路径，例如D:\\localpath\\examplefile.txt。
            // 如果未指定本地路径，则默认从示例程序所属项目对应本地路径中上传文件流。
//            String filePath= "D:\\localpath\\examplefile.txt";

            // 创建OSSClient实例。
            OSS ossClient = new OSSClientBuilder().build(ENDPOINT,ACCESS_KEY_ID,ACCESS_KEY_SECRET);
            String url = "";
            try {
//                InputStream inputStream = new FileInputStream(filePath);
                // 创建PutObjectRequest对象。
                PutObjectRequest putObjectRequest = new PutObjectRequest(BUCKET_NAME, objectName, inputStream);
                // 创建PutObject请求。
                url = "https://"+BUCKET_NAME+"."+ENDPOINT.substring(ENDPOINT.lastIndexOf("/")+1)+"/"+objectName;
                PutObjectResult result = ossClient.putObject(putObjectRequest);
            } 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();
                }
            }
            return url;
        }

}

写好可调用上传功能的接口

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@RestController
public class FileUploadController {
    @PostMapping("/upload")
    public Result<String> upload(MultipartFile multipartFile) throws Exception {
        String originalFilename = multipartFile.getOriginalFilename();
        String filename = UUID.randomUUID().toString()+originalFilename.substring(originalFilename.lastIndexOf("."));
//        multipartFile.transferTo(new File("C:\\Users\\23224\\Desktop\\txt文档\\"+filename));
        String url = AliOssUtil.uploadFile(filename, multipartFile.getInputStream());
        return Result.success(url);
    }
}