How to use Java to connect to Alibaba Cloud Object Storage: achieve large-scale file management and access control

How to use Java to connect to Alibaba Cloud Object Storage: achieve large-scale file management and access control

Alibaba Cloud Object Storage Service (OSS) is a highly reliable, secure, low-cost, high-performance Scalable cloud storage service provides massive, secure, low-cost, and highly reliable cloud storage services. This article will introduce how to use Java to connect to Alibaba Cloud OSS to achieve large-scale file management and access control.

1. Preparation

1. Register an Alibaba Cloud account and activate OSS service;
2. Create OSS storage space (Bucket) and record the Bucket name and access key ( Access Key ID and Access Key Secret).

2. Introduction of Alibaba Cloud OSS SDK
To use Alibaba Cloud OSS in a Java project, you need to introduce the corresponding SDK dependencies. The specific operations are as follows:

1. Add the following dependencies in the project's pom.xml file:

   <dependencies>
    <dependency>
        <groupId>com.aliyun.oss</groupId>
        <artifactId>aliyun-sdk-oss</artifactId>
        <version>3.11.1</version>
    </dependency>
   </dependencies>

2. Execute the Maven command to download dependencies:

   mvn clean package

3. Connect to OSS Service
In the Java code, we first need to establish a connection with Alibaba Cloud OSS, and we can use Access Key ID and Access Key Secret for authentication. The code example is as follows:

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;

public class OSSConnection {
    public static final String endpoint = "oss-cn-hangzhou.aliyuncs.com";
    public static final String accessKeyId = "your-access-key-id";
    public static final String accessKeySecret = "your-access-key-secret";

    public static void main(String[] args) {
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

        // 连接成功后可以进行后续的文件管理和访问控制操作

        ossClient.shutdown(); // 关闭连接
    }
}

4. File Management
Through the OSS service, we can perform file management operations such as uploading, downloading, and deleting. Here are some examples of common file management operations:

1. Upload files:

   import com.aliyun.oss.OSS;
   import com.aliyun.oss.OSSClientBuilder;
   import com.aliyun.oss.model.PutObjectRequest;
   
   public class FileUpload {
    public static final String endpoint = "oss-cn-hangzhou.aliyuncs.com";
    public static final String accessKeyId = "your-access-key-id";
    public static final String accessKeySecret = "your-access-key-secret";
    public static final String bucketName = "your-bucket-name";
    public static final String objectName = "your-object-name";
    public static final String localFilePath = "your-local-file-path";
   
    public static void main(String[] args) {
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
   
        // 上传文件
        PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName, new File(localFilePath));
        ossClient.putObject(putObjectRequest);
   
        ossClient.shutdown();
    }
   }

2. Download files:

   import com.aliyun.oss.OSS;
   import com.aliyun.oss.OSSClientBuilder;
   import com.aliyun.oss.model.GetObjectRequest;
   
   public class FileDownload {
    public static final String endpoint = "oss-cn-hangzhou.aliyuncs.com";
    public static final String accessKeyId = "your-access-key-id";
    public static final String accessKeySecret = "your-access-key-secret";
    public static final String bucketName = "your-bucket-name";
    public static final String objectName = "your-object-name";
    public static final String localFilePath = "your-local-file-path";
   
    public static void main(String[] args) {
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
   
        // 下载文件
        GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, objectName);
        ossClient.getObject(getObjectRequest, new File(localFilePath));
   
        ossClient.shutdown();
    }
   }

3. Delete files:

   import com.aliyun.oss.OSS;
   import com.aliyun.oss.OSSClientBuilder;
   
   public class FileDelete {
    public static final String endpoint = "oss-cn-hangzhou.aliyuncs.com";
    public static final String accessKeyId = "your-access-key-id";
    public static final String accessKeySecret = "your-access-key-secret";
    public static final String bucketName = "your-bucket-name";
    public static final String objectName = "your-object-name";
   
    public static void main(String[] args) {
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
   
        // 删除文件
        ossClient.deleteObject(bucketName, objectName);
   
        ossClient.shutdown();
    }
   }

5. Access control
Through the OSS service, we can control access to files and set the read and write permissions of files. The code example is as follows:

1. Set the public read permission of the file:

   import com.aliyun.oss.OSS;
   import com.aliyun.oss.OSSClientBuilder;
   import com.aliyun.oss.model.AccessControlList;
   import com.aliyun.oss.model.CannedAccessControlList;
   
   public class FileAccessControl {
    public static final String endpoint = "oss-cn-hangzhou.aliyuncs.com";
    public static final String accessKeyId = "your-access-key-id";
    public static final String accessKeySecret = "your-access-key-secret";
    public static final String bucketName = "your-bucket-name";
    public static final String objectName = "your-object-name";
   
    public static void main(String[] args) {
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
   
        // 设置文件公共读权限
        ossClient.setObjectAcl(bucketName, objectName, CannedAccessControlList.PublicRead);
   
        ossClient.shutdown();
    }
   }

2. Set the private read and write permission of the file:

   import com.aliyun.oss.OSS;
   import com.aliyun.oss.OSSClientBuilder;
   import com.aliyun.oss.model.AccessControlList;
   import com.aliyun.oss.model.CannedAccessControlList;
   import com.aliyun.oss.model.ObjectPermission;
   
   public class FileAccessControl {
    public static final String endpoint = "oss-cn-hangzhou.aliyuncs.com";
    public static final String accessKeyId = "your-access-key-id";
    public static final String accessKeySecret = "your-access-key-secret";
    public static final String bucketName = "your-bucket-name";
    public static final String objectName = "your-object-name";
   
    public static void main(String[] args) {
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
   
        // 设置文件私有读写权限
        ossClient.setObjectAcl(bucketName, objectName, CannedAccessControlList.Private);
   
        ossClient.shutdown();
    }
   }

This article introduces how to use Java to connect to Alibaba Cloud OSS to implement operations such as file upload, download, deletion, and access control. Through these functions, we can easily perform large-scale file management and access control. I hope this article can be helpful to everyone!

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