springBoot接入阿里云oss的实现步骤

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

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <scope>runtime</scope>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.15</version>
    </dependency>
    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.6</version>
    </dependency>
    <!-- 阿里云OSS -->
    <dependency>
      <groupId>com.aliyun.oss</groupId>
      <artifactId>aliyun-sdk-oss</artifactId>
      <version>3.10.2</version>
    </dependency>
  </dependencies>

package com.example.demo.entity;

import lombok.Data;

/**
 * 阿里云上传结果集
 *
 * @author wushuai
 * @create 2021-01-25
 */
@Data
public class AliyunOssResult {
  /**
   * code：200成功
   * code: 400失败
   */
  private int code;

  /**
   * 上传成功的返回url
   */
  private String url;

  /**
   * 提示信息
   */
  private String msg;
}

aliyunOss:
 endpoint: "http://oss-cn-shanghai.aliyuncs.com"
 accessKeyId: "xxxxxxx"
 accessKeySecret: "xxxxxxx"
 bucketName: "xxxxxx"
 urlPrefix: "http://bucketName.oss-cn-shanghai.aliyuncs.com/"

spring:
 servlet:
  multipart:
   max-file-size: 20MB
   max-request-size: 20MB

package com.example.demo.util;

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.model.DeleteObjectsRequest;
import com.aliyun.oss.model.DeleteObjectsResult;
import com.aliyun.oss.model.GeneratePresignedUrlRequest;
import com.example.demo.entity.AliyunOssResult;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.io.InputStream;
import java.net.URL;
import java.util.Date;
import java.util.List;

@Component
public class AliyunOSSUtil {

  @Value("${aliyunOss.endpoint}")
  private String endpoint;
  @Value("${aliyunOss.accessKeyId}")
  private String accessKeyId;
  @Value("${aliyunOss.accessKeySecret}")
  private String accessKeySecret;
  @Value("${aliyunOss.bucketName}")
  private String bucketName;
  @Value("${aliyunOss.urlPrefix}")
  private String urlPrefix;

  /**
   * 上传文件，以IO流方式
   *
   * @param inputStream 输入流
   * @param objectName   唯一objectName（在oss中的文件名字）
   */
  public AliyunOssResult upload(InputStream inputStream, String objectName) {
    AliyunOssResult aliyunOssResult = new AliyunOssResult();
    try {
      // 创建OSSClient实例。
      OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
      // 上传内容到指定的存储空间（bucketName）并保存为指定的文件名称（objectName）。
      ossClient.putObject(bucketName, objectName, inputStream);
      // 关闭OSSClient。
      ossClient.shutdown();
      aliyunOssResult.setCode(200);
      aliyunOssResult.setUrl(urlPrefix+objectName);
      aliyunOssResult.setMsg("上传成功");
    } catch (Exception e) {
      e.printStackTrace();
      aliyunOssResult.setCode(400);
      aliyunOssResult.setMsg("上传失败");
    }
    return aliyunOssResult;
  }

  /**
   * 删除OSS中的单个文件
   *
   * @param objectName 唯一objectName（在oss中的文件名字）
   */
  public void delete(String objectName) {
    try {
      // 创建OSSClient实例。
      OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
      // 删除文件。
      ossClient.deleteObject(bucketName, objectName);
      // 关闭OSSClient。
      ossClient.shutdown();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * 批量删除OSS中的文件
   *
   * @param objectNames oss中文件名list
   */
  public void delete(List<String> objectNames) {
    try {
      // 创建OSSClient实例。
      OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
      // 批量删除文件。
      DeleteObjectsResult deleteObjectsResult = ossClient.deleteObjects(new DeleteObjectsRequest(bucketName).withKeys(objectNames));
      List<String> deletedObjects = deleteObjectsResult.getDeletedObjects();
      // 关闭OSSClient。
      ossClient.shutdown();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * 获取文件临时url
   *
   * @param objectName oss中的文件名
   * @param effectiveTime 有效时间(ms)
   */
  public String getUrl(String objectName,long effectiveTime){
    OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
    // 设置URL过期时间
    Date expiration = new Date(new Date().getTime() + effectiveTime);
    GeneratePresignedUrlRequest generatePresignedUrlRequest ;
    generatePresignedUrlRequest =new GeneratePresignedUrlRequest(bucketName, objectName);
    generatePresignedUrlRequest.setExpiration(expiration);
    URL url = ossClient.generatePresignedUrl(generatePresignedUrlRequest);
    return url.toString();
  }

}

package com.example.demo.controller;

import com.example.demo.util.AliyunOSSUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

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

@RestController
@RequestMapping("/file")
public class FileController {

  @Autowired
  private AliyunOSSUtil aliyunOSSUtil;

  @RequestMapping(value = "/uploadFile")
  public @ResponseBody
  Object uploadFile(@RequestParam(value = "file", required = false) MultipartFile file,
           String strPath) throws IOException {
    String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".") + 1);
    String objectName = strPath+"/"+ UUID.randomUUID().toString()+"."+suffix;
    return aliyunOSSUtil.upload(file.getInputStream(),objectName);
  }
}