阿里云对象存储oss的使用和解决对象存储oss跨域问题

默认你是开通了，开通很容易，一点即可

1、首先创建Bucket

2、根据自己的需求选择，如果不懂直接按我的这个来

Bucker名称是唯一的，自己随便取一个

地域：选择离自己最近的

存储类型：标准存储

存储冗余类型：本地

读写权限：公共

其余的全部默认不用动

3、创建之后，点击概览，滑到最下面，外网访问这一行

4、前端代码:

1	`beforeUpload:选择图片之后会自动调用这个方法，获取数据相当于钥匙，然后会携带钥匙和文件一起发送给阿里云（action就是请求地址）。<br>这个方法是里面是异步操作，上传图片之前会调用你写的请求获取后端钥匙（dataObj），然后携带钥匙一起发往阿里云。`

1	`handleUploadSuccess：图片上传成功回调<br><br>`

<el-upload :data="dataObj" action="http://外网访问的Bucket域名" multiple
            accept="jpg,jpeg,png,PNG" list-type="picture-card" :on-success="handleUploadSuccess()"
             :before-upload="beforeUpload" :show-file-list="false">
             <!-- <img style="width: 9.3rem;height: 9.3rem;" v-if="goodsForm.defaultImg" :src="goodsForm.defaultImg" class="avatar"> -->
            <i v-if="!goodsForm.defaultImg" class="el-icon-plus" />
</el-upload>

5、然后获取AccessKey ID，这个很重要，千万不能泄露

鼠标移动到头像处，点击AccessKey管理

使用子用户

然后点创建用户，选择open api调用

6、后端代码，基本上是固定的

pom.xml

<!--OSS对象存储-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>aliyun-oss-spring-boot-starter</artifactId>
<!--            <version>3.8.0</version>-->
        </dependency>

controler

@Autowired
    private OssUtils ossUtils;
 
    @GetMapping("/api/cloud-oss/oss/policy")
    public Map<String,String> oss(){
        return ossUtils.getUploadPolicy();
    }

utils

@Component
@Slf4j
public class OssUtil {
    @Autowired
    private OSS ossClient;
 
    @Value("${alibaba.cloud.oss.endpoint}")
    private String endpoint;
    @Value("${alibaba.cloud.access-key}")
    private String accessKeyId;
    @Value("${alibaba.cloud.secret-key}")
    private String accessKeySecret;
    @Value("${alibaba.cloud.bucket}")
    private String bucket;
 
 
    public Map<String, String> getUploadPolicy() {
        Map<String, String> respMap = new LinkedHashMap<>();;
 
        // https://vivi-gulimall.oss-cn-hangzhou.aliyuncs.com
        String host = "https://" + bucket + "." + endpoint; // host的格式为 bucketname.endpoint
        // callbackUrl为 上传回调服务器的URL，请将下面的IP和Port配置为您自己的真实信息。
        // String callbackUrl = "http://88.88.88.88:8888";
        // 每一天产生一个文件夹
        String dir = LocalDate.now().toString() + "/"; // 用户上传文件时指定的前缀。
 
        try {
            long expireTime = 30;
            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
            Date expiration = new Date(expireEndTime);
            // PostObject请求最大可支持的文件大小为5 GB，即CONTENT_LENGTH_RANGE为5*1024*1024*1024。
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);
 
            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);
            respMap.put("accessid", accessKeyId);
            respMap.put("policy", encodedPolicy);
            respMap.put("signature", postSignature);
            respMap.put("dir", dir);
            respMap.put("host", host);
            respMap.put("expire", String.valueOf(expireEndTime / 1000));
            // respMap.put("expire", formatISO8601Date(expiration));
        } catch (Exception e) {
            // Assert.fail(e.getMessage());
            log.error("获取aliyun oss文件上传签名失败：{}", e.getMessage());
            throw new BizException(ResultCode.OSS_FAILED_TO_GETPOLICY);
        } finally {
            ossClient.shutdown();
        }
        return respMap;
    }
 
}