一、第一步先写上传的controller

package com.ttc.controller;

import com.ttc.pojo.Result;
import com.ttc.utils.AliOssUtil;
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;

@Slf4j
@RestController
@RequestMapping("/upload")
public class FileUploadController {

    @Autowired
    private AliOssUtil aliOssUtil;

    @PostMapping
    public Result<String> upload(MultipartFile file) {
        log.info("文件上传，原始文件名：{}", file);
        try {
            String url = aliOssUtil.upload(file.getBytes(),file.getOriginalFilename());
            return Result.success(url);
        } catch (IOException e) {
            log.error("文件上传失败{}",e);
        }
        return Result.error("文件上传失败");
    }
}

二、然后用到这个工具类，用来书写上传至阿里云OSS的格式命名（用yyyy-MM）的文件夹格式来命名，方便可以查看某年某月的文件夹下添加的文件

package com.ttc.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;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.UUID;

@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) {
        log.info("进入AliOssUtil.upload方法，原始文件名：{}", objectName);

        // 填写Object完整路径，例如202406/1.png。Object完整路径中不能包含Bucket名称。
        //获取当前系统日期的字符串,格式为 yyyy/MM
        String dir = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy/MM"));
        //生成一个新的不重复的文件名
        String newFileName = UUID.randomUUID() + objectName.substring(objectName.lastIndexOf("."));
        String newObjectName = dir + "/" + newFileName;
        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

        try {
            // 创建PutObject请求。
            ossClient.putObject(bucketName, newObjectName, 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();
            }
        }

        return endpoint.split("//")[0] + "//" + bucketName + "." + endpoint.split("//")[1] + "/" + newObjectName;
    }
}

三、配置阿里云OSS工具类：通过 @Bean 注解创建阿里云文件上传的工具类对象

package com.ttc.config;


import com.ttc.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;

@Configuration
@Slf4j
public class OssConfiguration {

    @Bean
    @ConditionalOnMissingBean
    public 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());
    }
}

四、配置属性类：用于读取和存储阿里云OSS的相关配置信息
自动绑定配置：通过 @ConfigurationProperties(prefix = "big-event.alioss") 注解，自动从配置文件中读取以 big-event.alioss 为前缀的配置项

package com.ttc.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "big-event.alioss")
@Data
public class AliOssProperties {

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

}

五、完成yml配置和pom.xml文件即可

big-event:
  alioss:
    endpoint: XXXXXX
    access-key-id: XXXXXX
    access-key-secret: XXXXXX
    bucket-name: XXXXXX

<!--引入阿里云OSS依赖坐标-->
        <dependency>
            <groupId>com.aliyun.oss</groupId>
            <artifactId>aliyun-sdk-oss</artifactId>
            <version>3.17.4</version>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.1</version>
        </dependency>
        <dependency>
            <groupId>javax.activation</groupId>
            <artifactId>activation</artifactId>
            <version>1.1.1</version>
        </dependency>
        <!-- no more than 2.3.3-->
        <dependency>
            <groupId>org.glassfish.jaxb</groupId>
            <artifactId>jaxb-runtime</artifactId>
            <version>2.3.3</version>
        </dependency>