com.qcloud.cos.utils

类 ServiceUtils

java.lang.Object

com.qcloud.cos.utils.ServiceUtils

public class ServiceUtils
extends Object

嵌套类概要

嵌套类

限定符和类型	类和说明
static interface	ServiceUtils.RetryableCOSDownloadTask Interface for the task of downloading object from COS to a specific file, enabling one-time retry mechanism after integrity check failure on the downloaded file.

字段概要

字段

限定符和类型	字段和说明
static boolean	APPEND_MODE
static boolean	OVERWRITE_MODE

构造器概要

构造器

构造器和说明
ServiceUtils()

方法概要

方法

限定符和类型	方法和说明
static void	downloadObjectToFile(COSObject cosObject, File destinationFile, boolean performIntegrityCheck, boolean appendData) Downloads an COSObject, as returned from COSClient#getObject(com.qcloud.cos.model.GetObjectRequest), to the specified file.
static void	downloadToFile(COSObject cosObject, File dstfile, boolean performIntegrityCheck, boolean appendData, long expectedFileLength) Same as downloadObjectToFile(COSObject, File, boolean, boolean) but has an additional expected file length parameter for integrity checking purposes.
static COSObject	retryableDownloadCOSObjectToFile(File file, ServiceUtils.RetryableCOSDownloadTask retryableCOSDownloadTask, boolean appendData) Gets an object stored in COS and downloads it into the specified file.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

APPEND_MODE

public static final boolean APPEND_MODE

另请参阅:

常量字段值

OVERWRITE_MODE

public static final boolean OVERWRITE_MODE

另请参阅:

常量字段值

构造器详细资料

ServiceUtils

public ServiceUtils()

方法详细资料

downloadToFile

public static void downloadToFile(COSObject cosObject,
                  File dstfile,
                  boolean performIntegrityCheck,
                  boolean appendData,
                  long expectedFileLength)

Same as downloadObjectToFile(COSObject, File, boolean, boolean) but has an additional expected file length parameter for integrity checking purposes.

参数:

expectedFileLength - applicable only when appendData is true; the expected length of the file to append to.

downloadObjectToFile

public static void downloadObjectToFile(COSObject cosObject,
                        File destinationFile,
                        boolean performIntegrityCheck,
                        boolean appendData)

Downloads an COSObject, as returned from COSClient#getObject(com.qcloud.cos.model.GetObjectRequest), to the specified file.

参数:

cosObject - The COSObject containing a reference to an InputStream containing the object's data.

destinationFile - The file to store the object's data in.

performIntegrityCheck - Boolean valuable to indicate whether to perform integrity check

appendData - appends the data to end of the file.

retryableDownloadCOSObjectToFile

public static COSObject retryableDownloadCOSObjectToFile(File file,
                                         ServiceUtils.RetryableCOSDownloadTask retryableCOSDownloadTask,
                                         boolean appendData)

Gets an object stored in COS and downloads it into the specified file. This method includes the one-time retry mechanism after integrity check failure on the downloaded file. It will also return immediately after getting null valued COSObject (when getObject request does not meet the specified constraints).

参数:

file - The file to store the object's data in.

retryableCOSDownloadTask - The implementation of SafeCOSDownloadTask interface which allows user to get access to all the visible variables at the calling site of this method.