oss配置类，在application.yml文件中加入
oss:
    bucketName:
    endpoint:
    accessKeyId:
    accessKeySecret:

package com.example.upload.vo;
import lombok.Getter;
import lombok.Setter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties(prefix = "oss")
public class OSSConfig {

    @Getter @Setter
    private String bucketName;
    @Getter @Setter
    private String endpoint;
    @Getter @Setter
    private String accessKeyId;
    @Getter @Setter
    private String accessKeySecret;
}

ossUtil类

 package com.example.upload.util;

import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.OSSObjectSummary;
import com.aliyun.oss.model.ObjectListing;
import com.example.upload.vo.OSSConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.PostConstruct;
import java.io.*;

@Component
public class OSSUtil {

    @Autowired
    private OSSConfig ossConfig;

    public static OSSUtil ossUtil;

    @PostConstruct
    public void init() {
        ossUtil = this;
    }

    //获取OSSClient实例
    private static OSSClient getOSSClient(){
        OSSClient ossClient = new OSSClient(ossUtil.ossConfig.getEndpoint(), ossUtil.ossConfig.getAccessKeyId(), ossUtil.ossConfig.getAccessKeySecret());
        return ossClient;
    }

    //文件流上传
    public static void uploadFile( File file,String key ) throws FileNotFoundException {
        OSSClient ossClient = getOSSClient();
        // 上传文件流
        //InputStream inputStream = new FileInputStream(fileName);
        ossClient.putObject(ossUtil.ossConfig.getBucketName(), key , file);
        // 关闭client
        ossClient.shutdown();
    }

    // MultipartFile方式上传
    public static String uploadPic(MultipartFile file, String key) throws IOException {
        OSSClient ossClient = getOSSClient();
        ossClient.putObject(ossUtil.ossConfig.getBucketName(), key , file.getInputStream());
        ossClient.shutdown();
        return key;
    }

    // 删除文件
    public static void deleteFile(String key ){

        // 创建OSSClient实例
        OSSClient ossClient = getOSSClient();
        // 删除Object
        ossClient.deleteObject(ossUtil.ossConfig.getBucketName(), key);
        // 关闭client
        ossClient.shutdown();

    }

    //获取存储对象的名字
    public static void listObject(){
        OSSClient ossClient = getOSSClient();
        // 获取指定bucket下的所有Object信息
        ObjectListing listing = ossClient.listObjects(ossUtil.ossConfig.getBucketName());

        // 遍历所有Object
        for (OSSObjectSummary objectSummary : listing.getObjectSummaries()) {
            System.out.println(objectSummary.getKey());
        }
    }
}

测试controller类

package com.example.upload.img;


import com.example.upload.util.OSSUtil;
import com.example.upload.util.UploadUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;


@Controller
public class ImgUpload {

    @RequestMapping(value="/testuploadimg", method = RequestMethod.POST)
    public @ResponseBody String uploadImg(@RequestParam("file") MultipartFile file,
                     HttpServletRequest request) throws IOException {
        String contentType = file.getContentType();
        String fileName = file.getOriginalFilename();
        String newFileName = UploadUtil.getRandomFileName(fileName);
        System.out.println("fileName-->" + newFileName);
        System.out.println("getContentType-->" + contentType);
        //String filePath = request.getSession().getServletContext().getRealPath("imgupload/");
        String filePath = "C:\\test/";
        System.out.println(filePath);
        String key = OSSUtil.uploadPic(file,newFileName);
        System.out.println(key+"---------");
        if(key==null){
            return null;
        }
        //返回json
        return "uploadimg success";
    }
    @RequestMapping(value="/gouploadimg", method = RequestMethod.GET)
    public String goUploadImg() {
        //跳转到 templates 目录下的 uploadimg.html
        return "uploadimg";
    }



}

测试html

<!DOCTYPE html>
<html>
<head>
    <title>uploadimg.html</title>

    <meta name="keywords" content="keyword1,keyword2,keyword3"></meta>
    <meta name="description" content="this is my page"></meta>
    <meta name="content-type" content="text/html; charset=UTF-8"></meta>

    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

</head>

<body>
<form enctype="multipart/form-data" method="post" action="/testuploadimg">
    图片<input type="file" name="file"/>
    <input type="submit" value="上传"/>
</form>
</body>
</html>

maven 依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>com.aliyun.oss</groupId>
            <artifactId>aliyun-sdk-oss</artifactId>
            <version>2.8.2</version>
        </dependency>
        
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.10</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>