OSS在完成文件(Object)上传时可以提供回调(Callback)给应用服务器。您只需要在发送给OSS的请求中携带相应的Callback参数,即可实现上传回调。

示例代码

以下代码用于上传回调。

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import java.io.ByteArrayInputStream;

public class Demo {
    public static void main(String[] args) {
        // Endpoint以华东1(杭州)为例,其它Region请按实际情况填写。
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 阿里云账号AccessKey拥有所有API的访问权限,风险很高。强烈建议您创建并使用RAM用户进行API访问或日常运维,请登录RAM控制台创建RAM用户。
        String accessKeyId = "yourAccessKeyId";
        String accessKeySecret = "yourAccessKeySecret";
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写Object完整路径,例如exampledir/exampleobject.txt。Object完整路径中不能包含Bucket名称。
        String objectName = "exampledir/exampleobject.txt";
        // 您的回调服务器地址,例如https://example.com:23450或者https://127.0.0.1:9090。
        String callbackUrl = "yourCallbackServerUrl";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
        try {
            String content = "Hello OSS";
            PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName,new ByteArrayInputStream(content.getBytes()));

            // 上传回调参数。
            Callback callback = new Callback();
            callback.setCallbackUrl(callbackUrl);
            //(可选)设置回调请求消息头中Host的值,即您的服务器配置Host的值。
            // callback.setCallbackHost("yourCallbackHost");
            // 设置发起回调时请求body的值。
            callback.setCallbackBody("{\\\"mimeType\\\":${mimeType},\\\"size\\\":${size}}");
            // 设置发起回调请求的Content-Type。
            callback.setCalbackBodyType(Callback.CalbackBodyType.JSON);
            // 设置发起回调请求的自定义参数,由Key和Value组成,Key必须以x:开始。
            callback.addCallbackVar("x:var1", "value1");
            callback.addCallbackVar("x:var2", "value2");
            putObjectRequest.setCallback(callback);

            PutObjectResult putObjectResult = ossClient.putObject(putObjectRequest);

            // 读取上传回调返回的消息内容。
            byte[] buffer = new byte[1024];
            putObjectResult.getResponse().getContent().read(buffer);
            // 数据读取完成后,获取的流必须关闭,否则会造成连接泄漏,导致请求无连接可用,程序无法正常工作。
            putObjectResult.getResponse().getContent().close();
        } 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 (Throwable 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();
            }
        }
    }
}

相关文档

  • 关于上传回调的完整示例代码,请参见GitHub示例
  • 关于上传回调的API接口说明,请参见Callback