Get SharePoint Document Id Programmatically Java

Question

I have SharePoint 2013 site mounted as a network drive. I am accessing the document library through Java code, and want to know how to get the unique Document Id that SharePoint maintains for each document.

I try to get the id for a file on a file system like this

public static final String getFileId(Path path) 
        throws Exception {
    try {
        if(path != null) {
            BasicFileAttributes basicAttributes = Files.readAttributes(path, BasicFileAttributes.class);

            // Linux file system, get file id from inode
            if(basicAttributes.fileKey() != null) {
                return basicAttributes.fileKey().toString();
            } else {
                // Windows file system, get file id via Kernel32.dll
                logger.debug("The fileKey() method returned null");
                WinBase.SECURITY_ATTRIBUTES attr = null;
                BY_HANDLE_FILE_INFORMATION fileInformation = new BY_HANDLE_FILE_INFORMATION();
                HANDLE fileHandler = Kernel32.INSTANCE.CreateFile(path.toString(), Kernel32.GENERIC_READ, Kernel32.FILE_SHARE_READ, attr, Kernel32.OPEN_EXISTING, Kernel32.FILE_ATTRIBUTE_ARCHIVE, null);
                Kernel32.INSTANCE.GetFileInformationByHandle(fileHandler, fileInformation);
                String fileId = fileInformation.nFileIndexHigh + "-" + fileInformation.nFileIndexLow;                   
                Kernel32.INSTANCE.CloseHandle(fileHandler);

                return fileId;
            }
        }
    } catch(Exception err) {
        throw err;
    }

    return SCConstant.EMPTY;
}

The above method when run on SharePoint documents (residing on the mounted network drive), give 0 for the index high and index low, and hence for all documents fileId is 0-0. I need a way to get the document id that SharePoint uses to uniquely identify each document.

Answer 1

I solved my question so I am posting an answer.

What I first did was enable Document ID feature for SharePoint. We need to go to Site Settings and under Site Collection Administration > Site collection features, we need to activate Document Id service. A scheduled job generally assigns document ids to all document existing in SharePoint.

Next we can use the endpoint /GetFileByServerRelativeUrl(filePath)/ListItemAllFields to get the document id via SharePoint REST API.