Accessing OBS Using a Signed URL (SDK for Java)

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import java.util.Map;
public class CreateBucket001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.PUT, expireSeconds);
            request.setBucketName("examplebucket");
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("Creating bucket using temporary signature url:");
            System.out.println("\t" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // Make a PUT request to create a bucket.
            String location = "your bucket location";
            Request httpRequest =
                    builder.url(response.getSignedUrl())
                            .put(
                                    RequestBody.create(
                                            null,
                                            ("<CreateBucketConfiguration><Location>"
                                                    + location
                                                    + "</Location></CreateBucketConfiguration>").getBytes()))
                            .build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("\tStatus:" + res.code());
            if (res.body() != null) {
                System.out.println("\tContent:" + res.body().string() + "\n");
            }
            res.close();
            System.out.println("CreateBucket successfully");
        } catch (ObsException e) {
            System.out.println("CreateBucket 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("CreateBucket failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import java.util.HashMap;
import java.util.Map;
public class PutObject001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            Map<String, String> headers = new HashMap<>();
            String contentType = "text/plain";
            headers.put("Content-Type", contentType);
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.PUT, expireSeconds);
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            request.setHeaders(headers);
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("Creating object using temporary signature url:");
            System.out.println("\t" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // Make a PUT request to upload an object.
            Request httpRequest =
                    builder.url(response.getSignedUrl())
                            .put(RequestBody.create(MediaType.parse(contentType), "Hello OBS".getBytes("UTF-8")))
                            .build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("Status:" + res.code());
            if (res.body() != null) {
                System.out.println("Content:" + res.body().string() + "\n");
            }
            res.close();
            System.out.println("PutObject successfully");
        } catch (ObsException e) {
            System.out.println("PutObject 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("PutObject failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import java.io.InputStream;
import java.util.Map;
public class GetObject001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("Getting object using temporary signature url:");
            System.out.println("SignedUrl:" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // Make a GET request to download an object.
            Request httpRequest = builder.url(response.getSignedUrl()).get().build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("Status:" + res.code());
            InputStream objectContent = null;
            if (res.body() != null) {
                objectContent = res.body().byteStream();
                System.out.println("Content:" + res.body().string() + "\n");
            }
            if(objectContent != null) {
                // objectContent is the file stream to download.
                // You can read the objectContent stream to download the file. If the stream is not read for a long time, it will be disconnected from the server.
            }
            res.close();
            System.out.println("getObject successfully");
        } catch (ObsException e) {
            System.out.println("getObject 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("getObject failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import java.util.Map;
public class ListObject001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
            request.setBucketName("examplebucket");
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("Getting object list using temporary signature url:");
            System.out.println("\t" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // Make a GET request to obtain the object list.
            Request httpRequest = builder.url(response.getSignedUrl()).get().build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("Status:" + res.code());
            if (res.body() != null) {
                System.out.println("Content:" + res.body().string() + "\n");
            }
            res.close();
            System.out.println("ListObject successfully");
        } catch (ObsException e) {
            System.out.println("ListObject 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("ListObject failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import java.util.Map;
public class DeleteObject001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.DELETE, expireSeconds);
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("Deleting object using temporary signature url:");
            System.out.println("\t" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // Make a DELETE request to delete an object.
            Request httpRequest = builder.url(response.getSignedUrl()).delete().build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("\tStatus:" + res.code());
            if (res.body() != null) {
                System.out.println("\tContent:" + res.body().string() + "\n");
            }
            res.close();
            System.out.println("deleteObjects successfully");
        } catch (ObsException e) {
            System.out.println("deleteObjects 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("deleteObjects failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.SpecialParamEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import java.util.Map;
public class InitiateMultiPartUpload001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.POST, expireSeconds);
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            request.setSpecialParam(SpecialParamEnum.UPLOADS);
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("initiate multipart upload using temporary signature url:");
            System.out.println("\t" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // Make a POST request to initiate the multipart upload.
            Request httpRequest = builder.url(response.getSignedUrl()).post(RequestBody.create(null, "")).build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("Status:" + res.code());
            if (res.body() != null) {
                System.out.println("Content:" + res.body().string() + "\n");
            }
            res.close();
            System.out.println("InitiateMultiPartUpload successfully");
        } catch (ObsException e) {
            System.out.println("InitiateMultiPartUpload 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("InitiateMultiPartUpload failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import java.util.HashMap;
import java.util.Map;
public class UploadPart001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.PUT, expireSeconds);
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            Map<String, Object> queryParams = new HashMap<String, Object>();
            // Set the partNumber parameter, for example, queryParams.put("partNumber", "1").
            queryParams.put("partNumber", "partNumber");
            queryParams.put("uploadId", "your uploadId");
            request.setQueryParams(queryParams);
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("upload part using temporary signature url:");
            System.out.println("SignedUrl:" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // Make a PUT request to upload a part.
            Request httpRequest =
                    builder.url(response.getSignedUrl())
                            .put(RequestBody.create(null, new byte[6 * 1024 * 1024]))
                            .build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("Status:" + res.code());
            if (res.body() != null) {
                System.out.println("Content:" + res.body().string() + "\n");
            }
            res.close();
            System.out.println("UploadPart successfully");
        } catch (ObsException e) {
            System.out.println("UploadPart 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("UploadPart failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import java.util.HashMap;
import java.util.Map;
public class ListUploadedParts001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            Map<String, Object> queryParams = new HashMap<String, Object>();
            queryParams.put("uploadId", "your uploadId");
            request.setQueryParams(queryParams);
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("list parts using temporary signature url:");
            System.out.println("\t" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // Make a GET request to list uploaded parts.
            Request httpRequest = builder.url(response.getSignedUrl()).get().build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("Status:" + res.code());
            if (res.body() != null) {
                System.out.println("Content:" + res.body().string() + "\n");
            }
            res.close();
            System.out.println("ListParts successfully");
        } catch (ObsException e) {
            System.out.println("ListParts 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("ListParts failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import okhttp3.Call;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import java.util.HashMap;
import java.util.Map;
public class CompleteMultiPartUpload001 {
    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 {
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.POST, expireSeconds);
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            Map<String, String> headers = new HashMap<>();
            String contentType = "application/xml";
            headers.put("Content-Type", contentType);
            request.setHeaders(headers);
            Map<String, Object> queryParams = new HashMap<>();
            queryParams.put("uploadId", "your uploadId");
            request.setQueryParams(queryParams);
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            System.out.println("complete multipart upload using temporary signature url:");
            System.out.println("\t" + response.getSignedUrl());
            Request.Builder builder = new Request.Builder();
            for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
                builder.header(entry.getKey(), entry.getValue());
            }
            // The following content is used as an example. You need to replace it with the responses of the request for listing uploaded parts.
            String content = "<CompleteMultipartUpload>";
            content += "<Part>";
            content += "<PartNumber>1</PartNumber>";
            content += "<ETag>da6a0d097e307ac52ed9b4ad551801fc</ETag>";
            content += "</Part>";
            content += "<Part>";
            content += "<PartNumber>2</PartNumber>";
            content += "<ETag>da6a0d097e307ac52ed9b4ad551801fc</ETag>";
            content += "</Part>";
            content += "</CompleteMultipartUpload>";
            // Make a POST request to assemble the uploaded parts.
            Request httpRequest =
                    builder.url(response.getSignedUrl())
                            .post(RequestBody.create(MediaType.parse(contentType), content.getBytes("UTF-8")))
                            .build();
            OkHttpClient httpClient =
                    new OkHttpClient.Builder()
                            .followRedirects(false)
                            .retryOnConnectionFailure(false)
                            .cache(null)
                            .build();
            Call c = httpClient.newCall(httpRequest);
            Response res = c.execute();
            System.out.println("\tStatus:" + res.code());
            if (res.body() != null) {
                System.out.println("\tContent:" + res.body().string() + "\n");
            }
            res.close();
        } catch (ObsException e) {
            System.out.println("CompleteMultiPartUpload 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("CompleteMultiPartUpload failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.HttpMethodEnum;
import com.obs.services.model.TemporarySignatureRequest;
import com.obs.services.model.TemporarySignatureResponse;
import java.util.HashMap;
import java.util.Map;
public class GetObject002 {
    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 {
            // Obtain a signed URL for downloading a processed image. 
            // Set the validity period of the URL to 3600 seconds.
            long expireSeconds = 3600L;
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            // Set the parameters for image processing.
            Map<String, Object> queryParams = new HashMap<String, Object>();
            queryParams.put("x-image-process", "image/resize,m_fixed,w_100,h_100/rotate,100");
            request.setQueryParams(queryParams);
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            // Obtain the download link for image processing.
            System.out.println("Getting object using temporary signature url:");
            System.out.println("SignedUrl:" + response.getSignedUrl());
        } catch (ObsException e) {
            System.out.println("getObject 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("getObject failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}