How to identify file type by Base64 encoded string of a image [duplicate]

Answer 1

I did just this: (file is my base64 string)

    int extentionStartIndex = file.indexOf('/');
    int extensionEndIndex = file.indexOf(';');
    int filetypeStartIndex = file.indexOf(':');

    String fileType = file.substring(filetypeStartIndex + 1, extentionStartIndex);
    String fileExtension = file.substring(extentionStartIndex + 1, extensionEndIndex);

    System.out.println("fileType : " + fileType);
    System.out.println("file Extension :" + fileExtension);