如何通过 java 服务将文件从一个目录复制到另一个目录？

Question

我正在创建应用程序以将文件从一个目录复制到另一个目录。

jSON 输入是：

{   "accountName" : "name", 
    "accountKey"  : "key",
    "source" : "directory1/directory2/directory3/directory4",
    "destination" : "directory1/directory2",
    "fileToCopy"    : "1"
}

要将名为“1”的文件从目录 4 复制到目录 2。

我的 java 代码是：

@Override
    public JSONObject copyFile(JSONObject jsonInput) throws IOException, InvalidKeyException, URISyntaxException {
        CloudFileClient fileClient = null;
        String storageConnectionString = "DefaultEndpointsProtocol=https;AccountName="+jsonInput.get("accountName")+";"+"AccountKey="+jsonInput.get("accountKey");
        System.out.println(storageConnectionString);
        CloudStorageAccount storageAccount = CloudStorageAccount.parse(storageConnectionString);
        JSONObject jsonOutput = new JSONObject();
        try {
            fileClient = storageAccount.createCloudFileClient();

            String source = jsonInput.get("source").toString();
            String destination = jsonInput.get("destination").toString();
            String fileToCopy = jsonInput.get("fileToCopy").toString();
            String[] sourceNameArray = source.split("\s*/\s*");
            System.out.println(sourceNameArray.length);
            String[] destinationNameArray = destination.split("\s*/\s*");
            System.out.println(destinationNameArray.length);
            CloudFileShare share = fileClient
                    .getShareReference(sourceNameArray[0].toLowerCase().replaceAll("[-+.^:,!@#$%&*()_~`]", ""));
            CloudFileDirectory rootDir = share.getRootDirectoryReference();
            for (int i=0; i< sourceNameArray.length; i++)
            {
                String directoryToCreate = sourceNameArray[i];
                CloudFileDirectory directory = rootDir.getDirectoryReference(directoryToCreate);
                if(i==sourceNameArray.length-1)
                {
                    CloudFile fileToCopyFromSorce = directory.getFileReference(fileToCopy);

                    for (int j=0; j< destinationNameArray.length; j++)
                    {
                        String directoryToCreateForDestination = destinationNameArray[j];
                        CloudFileDirectory directoryForDestination = rootDir.getDirectoryReference(directoryToCreateForDestination);
                        if(j==destinationNameArray.length-1){
                        CloudFile fileDestination = directoryForDestination.getFileReference(fileToCopy);
                        // is next line required?
                //fileToCopyFromSorce.create(1);
                        fileDestination.startCopy(fileToCopyFromSorce);
                        System.out.println("copied to destination");
                        jsonOutput.put("status", "successful");
                        }
                        rootDir = directoryForDestination;
                    }
                }
                rootDir = directory;
            }

        } catch (Exception e) {
            System.out.println("Exception is " + e);
            jsonOutput.put("status", "unsuccessful");
            jsonOutput.put("exception", e.toString());
        }
        return jsonOutput;
    }

我收到错误消息，

Exception is com.microsoft.azure.storage.StorageException: The specified parent path does not exist.

但是我在我的 Azure 存储帐户中指定了父路径。

如果可能，需要有关代码和任何参考代码的建议。

Answer 1

根据异常，问题是由于Azure文件存储中不存在文件的父目录引起的，如下图来自here。

所以当你需要获取目录引用时，你需要首先从根目录到子目录逐个检查并创建这些父目录，例如下面的目标路径代码。

String destination = "directory1/directory2";
CloudFileDirectory rootDir = share.getRootDirectoryReference();
String[] destinationNameArray = destination.split("/");
CloudFileDirectory kidDir = rootDir;
for(String name: destinationNameArray) {
    kidDir = kidDir.getDirectoryReference(name);
    kidDir.createIfNotExists();
}

然后您可以直接从源复制文件到目标，如下所示。

String source = "directory1/directory2/directory3/directory4";
String destination = "directory1/directory2";
String fileName = "1";
CloudFileDirectory sourceDir = rootDir.getDirectoryReference(source);
CloudFileDirectory destinationDir = rootDir.getDirectoryReference(destination);
CloudFile sourceFile = sourceDir.getFileReference(fileName);
CloudFile destinationFile = destinationDir.getFileReference(fileName);
destinationFile.startCopy(sourceFile);

如何通过 java 服务将文件从一个目录复制到另一个目录？

How to copy file from one directory to other in azure through java service?

java

logic

azure

file-handling