利用阿里云OSS实现文件流传输

首先在阿里云购买OSS服务并设置公共读，开启设置bucket后

我们可以在利用SpringBoot去实现文件流传输

首先要导包

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<dependency>
           <groupId>com.aliyun.oss</groupId>
           <artifactId>aliyun-sdk-oss</artifactId>
    		<version>XX.XX.XX</version>
       </dependency>

配置好配置文件yaml

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sky:
  alioss:
    endpoint: 终端uri
    #oss-cn-beijing.aliyuncs.com
    access-key-id: 秘钥id
    access-key-secret: 你的秘钥
    bucket-name: 你的Bucket名

定义工具类

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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.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;

@Data
@AllArgsConstructor
@NoArgsConstructor
@Slf4j
@Component
public class AliOssUtil {
    //注入值
    @Value("${sky.alioss.endpoint}")
    private String endpoint;
    @Value("${sky.alioss.access-key-id}")
    private String accessKeyId;
    @Value("${sky.alioss.access-key-secret}")
    private String accessKeySecret;
    @Value("${sky.alioss.bucket-name}")
    private String bucketName;

    /**
     * 文件上传
     *
     * @param bytes
     * @param objectName
     * @return
     */
    public String upload(byte[] bytes, String objectName) {

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

        try {
            // 创建PutObject请求。
            ossClient.putObject(bucketName, objectName, 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();
            }
        }
	
        StringBuilder stringBuilder = new StringBuilder("https://");
        stringBuilder
                .append(bucketName)
                .append(".")
                .append(endpoint)
                .append("/")
                .append(objectName);

        log.info("文件上传到:{}", stringBuilder.toString());
		//返回生成图片的URL
        return stringBuilder.toString();
    }
}

开始具体实现

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   @PostMapping("/upload")
  //Spring为我们提供了一个接口类用于封装前端传输过来的流对象
public Result upload(MultipartFile file) throws IOException {
	//接口方法用于获取最后一个 指定字符串的索引
       int extendIndex = file.getOriginalFilename().lastIndexOf(".");
       //截取后缀名
       String extendString = file.getOriginalFilename().substring(extendIndex);
       //文件名name
       String ObjectName = UUID.randomUUID().toString() + extendString;
     	//上传文件
       String upload = aliOssUtil.upload(file.getBytes(), ObjectName);
       return Result.success(upload);
   }

之后生成的URL就可以返回到前端，前端使用URL即可读取图片