1.1 创建阿里OSS bucket

OSS Java SDK 兼容性和示例代码_对象存储(OSS)-阿里云帮助中心 (aliyun.com)

1.2 编写工具类

package com.geji.utils;

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
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 {

    // Endpoint以华东1（杭州）为例，其它Region请按实际情况填写。
    private static final String ENDPOINT = "XXXXXXXXXXXXXXXXXXXXXX";
    // 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();
    private static final String ACCESS_KEY_ID="XXXXXXXXXXXXXXXXXXXXXXX";
    private static final String ACCESS_KEY_SECRET="XXXXXXXXXXXXXXXXXXXXXXXXXXXX";
    // 填写Bucket名称，例如examplebucket。
    private static final String BUCKET_NAME = "XXXXXXXXXXXXXXXXXXXXXXXXXXXX";

    public static String uploadFile(String objectName,InputStream in) throws Exception {



        // 创建OSSClient实例。
        //OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);
        OSS ossClient = new OSSClientBuilder().build(ENDPOINT, ACCESS_KEY_ID,ACCESS_KEY_SECRET);
        String url="";
        try {
            // 填写字符串。
            String content = "Hello OSS，你好世界";

            // 创建PutObjectRequest对象。
            PutObjectRequest putObjectRequest = new PutObjectRequest(BUCKET_NAME, objectName, in);

            // 如果需要上传时设置存储类型和访问权限，请参考以下示例代码。
            // ObjectMetadata metadata = new ObjectMetadata();
            // metadata.setHeader(OSSHeaders.OSS_STORAGE_CLASS, StorageClass.Standard.toString());
            // metadata.setObjectAcl(CannedAccessControlList.Private);
            // putObjectRequest.setMetadata(metadata);

            // 上传字符串。
            PutObjectResult result = ossClient.putObject(putObjectRequest);
            url = "https://"+BUCKET_NAME+"."+ENDPOINT.substring(ENDPOINT.lastIndexOf("/")+1)+"/"+objectName;
        } 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;
    }

}

1.3 创建文件上传controller

package com.geji.controller;

import com.geji.pojo.Result;
import com.geji.utils.AliOssUtil;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

@RestController
public class FileUploadController {

    @PostMapping("/upload")
    public Result<String> upload(MultipartFile file) throws Exception {
        String originalFilename=file.getOriginalFilename();
        String filename= UUID.randomUUID().toString()+originalFilename.substring(originalFilename.lastIndexOf("."));
        String url= AliOssUtil.uploadFile(filename,file.getInputStream());
        return Result.success(url);
    }
}

1.4 postman测试