Listing Objects (SDK for Java)

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
public class ListObjects001 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // Listing objects.
            ObjectListing result = obsClient.listObjects("examplebucket");
            for (ObsObject obsObject : result.getObjects()) {
                System.out.println("listObjects successfully");
                System.out.println("ObjectKey:" + obsObject.getObjectKey());
                System.out.println("Owner:" + obsObject.getOwner());
            }
        } catch (ObsException e) {
            System.out.println("listObjects failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listObjects failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListObjectsRequest;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
public class ListObjects002 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List a specified number of objects.
            ListObjectsRequest request = new ListObjectsRequest("examplebucket");
            // Set the number of objects to be listed to 100.
            request.setMaxKeys(100);
            ObjectListing result = obsClient.listObjects(request);
            for (ObsObject obsObject : result.getObjects()) {
                System.out.println("listObjects successfully");
                System.out.println("ObjectKey:" + obsObject.getObjectKey());
                System.out.println("Owner:" + obsObject.getOwner());
            }
        } catch (ObsException e) {
            System.out.println("listObjects failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listObjects failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListObjectsRequest;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
public class ListObjects003 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List objects by specifying a prefix.
            ListObjectsRequest request = new ListObjectsRequest("examplebucket");
            // List 100 objects with the specified prefix.
            request.setMaxKeys(100);
            request.setPrefix("prefix");
            ObjectListing result = obsClient.listObjects(request);
            for (ObsObject obsObject : result.getObjects()) {
                System.out.println("listObjects successfully");
                System.out.println("ObjectKey:" + obsObject.getObjectKey());
                System.out.println("Owner:" + obsObject.getOwner());
            }
        } catch (ObsException e) {
            System.out.println("listObjects failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listObjects failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListObjectsRequest;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
public class ListObjects004 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List objects by specifying the start position.
            ListObjectsRequest request = new ListObjectsRequest("examplebucket");
            // Specify that 100 objects whose names follow test in lexicographical order will be listed.
            request.setMaxKeys(100);
            request.setMarker("test");
            ObjectListing result = obsClient.listObjects(request);
            for (ObsObject obsObject : result.getObjects()) {
                System.out.println("listObjects successfully");
                System.out.println("ObjectKey:" + obsObject.getObjectKey());
                System.out.println("Owner:" + obsObject.getOwner());
            }
        } catch (ObsException e) {
            System.out.println("listObjects failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listObjects failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListObjectsRequest;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
public class ListObjects005 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List all objects using pagination.
            ListObjectsRequest request = new ListObjectsRequest("examplebucket");
            // Set the number of objects displayed per page to 100.
            request.setMaxKeys(100);
            ObjectListing result;
            do {
                result = obsClient.listObjects(request);
                for (ObsObject obsObject : result.getObjects()) {
                    System.out.println("listObjects successfully");
                    System.out.println("ObjectKey:" + obsObject.getObjectKey());
                    System.out.println("Owner:" + obsObject.getOwner());
                }
                request.setMarker(result.getNextMarker());
            } while (result.isTruncated());
        } catch (ObsException e) {
            System.out.println("listObjects failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listObjects failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListObjectsRequest;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
public class ListObjects006 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            //List all objects in a folder.
            ListObjectsRequest request = new ListObjectsRequest("examplebucket");
            // Set folder name dir/ as the prefix.
            request.setPrefix("dir/");
            request.setMaxKeys(100);
            ObjectListing result;
            do {
                result = obsClient.listObjects(request);
                for (ObsObject obsObject : result.getObjects()) {
                    System.out.println("listObjects successfully");
                    System.out.println("ObjectKey:" + obsObject.getObjectKey());
                    System.out.println("Owner:" + obsObject.getOwner());
                }
                request.setMarker(result.getNextMarker());
            } while (result.isTruncated());
        } catch (ObsException e) {
            System.out.println("listObjects failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listObjects failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListObjectsRequest;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
public class ListObjects007 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List all objects in the root directory.
            ListObjectsRequest request = new ListObjectsRequest("examplebucket");
            request.setMaxKeys(1000);
            // Set folder isolators to slashes (/).
            request.setDelimiter("/");
            ObjectListing result = obsClient.listObjects(request);
            System.out.println("Objects in the root directory:");
            for (ObsObject obsObject : result.getObjects()) {
                System.out.println("listObjects successfully");
                System.out.println("ObjectKey:" + obsObject.getObjectKey());
                System.out.println("Owner:" + obsObject.getOwner());
            }
            listObjectsByPrefix(obsClient, request, result);
        } catch (ObsException e) {
            System.out.println("listObjects failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listObjects failed");
            // Print other error information.
            e.printStackTrace();
        }
    }

// Recursively list objects in a sub-folder.
    static void listObjectsByPrefix(ObsClient obsClient, ListObjectsRequest request, ObjectListing result)
            throws ObsException {
        for (String prefix : result.getCommonPrefixes()) {
            System.out.println("Objects in folder [" + prefix + "]:");
            request.setPrefix(prefix);
            result = obsClient.listObjects(request);
            for (ObsObject obsObject : result.getObjects()) {
                System.out.println("ObjectKey:" + obsObject.getObjectKey());
                System.out.println("Owner:" + obsObject.getOwner());
            }
            listObjectsByPrefix(obsClient, request, result);
        }
    }
}