Issues in converting base64 decoded byte array to String in java :
public static String decode(String strcontent) throws Exception
{
BASE64Decoder decoder = new BASE64Decoder();
byte[] imgBytes = decoder.decodeBuffer(strcontent);
return new String(imgBytes);
}
With the above code; was trying to create a string out of the Base 64 decoded byte array (imgBytes ) & input strcontent is base 64 encoded string. For text files it working fine , but for PDF and image files the string conversion is having issues. Have tried different encoding as UTF-8 , UTF 16 etc. But no use. The returned string is different than the original one.
When tried to write the byte array to a file like :
OutputStream out = new FileOutputStream(##path);
out.write(imgBytes);
out.close();
File is getting created properly without any issues.
I tried the below code:
byte[] imgBytes= ( new String(imgBytes1)).getBytes(); //Converting to String and back to bytes
OutputStream out = new FileOutputStream(##Filename);
out.write(imgBytes); out.close();
This time the image file is corrupted.
Please suggest.
Related
I'm trying to write some selenium/java test that checks 2FA configuration process. Thus I have to scan some QR code from a page in order to process it with zxing. The image format is Base64 and I'm struggling with decoding it to the byte array. The following code should convert base64 string to byte array, and then write it to the file.
Here is the code I wrote:
String base64Source = LocalDriverManager.get().findElement(By.xpath("//img[#class='qr-code']")).getAttribute("src");
String base64Image = base64Source.split(",")[1];
byte[] decoded = Base64.getMimeDecoder().decode(base64Image);
try (OutputStream stream = new FileOutputStream("QR_CODE.png")){
stream.write(decoded);
}
This code compiles with no errors, but when I try to open generated png file I get only "Fatal error reading PNG image file: Decompression error in IDAT".
I know that base64 string is valid as I was able to convert it to the image using some online converter. Also, I checked the string with online validator and it said that this is a valid base64 MIME string.
Example of the base64 code below:
iVBORw0KGgoAAAANSUhEUgAAAeoAAAHqAQAAAADjFjCXAAAET0lEQVR4nO2dXYrrOgyAP50E5jGB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%0AFuoX02DU2vMAAAAASUVORK5CYII=
try this
String base64Source = LocalDriverManager.get().findElement(By.xpath("//img[#class='qr-code']")).getAttribute("src");
String base64Image = base64Source.split(";")[1].split(",")[1]; //Try this
byte[] decoded = Base64.getMimeDecoder().decode(base64Image);
try (OutputStream stream = new FileOutputStream("QR_CODE.png")){
stream.write(decoded);
}
Okay, so i figured it out, so now it works.
The thing is when I run:
String base64Source = LocalDriverManager.get().findElement(By.xpath("//img[#class='qr-code']")).getAttribute("src");
it adds a neweline (%0A) characters to the string so before decoding it to byte array I need to run qrCodeImage = qrCodeImage.replaceAll("%0A", ""); in order to remove them.
I am getting PDF content which is Base 64 encoded. I tried to decode it using NIFI with Processor Base64EncodeContent. The Decoded file I am sending in mail. Below is small sample of output coming in mail.
enter image description here
"No data should be available in . ¹ Check if sent . . All documents are sent as pdf to* 9 : ’ ³: > < âA m¬‘²#%é‚ÇŽÇ¢|ÀÈ™$Éز§Uû÷LÒTB¨ l,îåù˜$â´º?6N¬JC¤ŒÃ°‰_Ïg -æ¿;ž‰ìÛÖYl`õ?èÓÌ[ ÿÿ PK"
How to extract the data in PDF as sent by third party?
I have tried to decode it using JAVA code and there also its failing. Not able to open the PDF, junk characters coming there too.
ConvertedJPGPDF.pdf file used below contains Base64 encoded String.
String filePath = "C:\\Users\\xyz\\Desktop\\";
String originalFileName = "ConvertedJPGPDF.pdf";
String newFileName = "test.pdf";
byte[] input_file =
Files.readAllBytes(Paths.get(filePath+originalFileName));
// byte[] decodedBytes = Base64.getDecoder().decode(input_file);
byte[] decodedBytes1 = Base64.getMimeDecoder().decode(input_file);
FileOutputStream fos = new FileOutputStream(filePath+newFileName);
fos.write(decodedBytes1);
fos.flush();
fos.close();
You mentioned that the file contains base64 encoded string already.
ConvertedJPGPDF.pdf file used below contains Base64 encoded String.
So, you don't need to run this line:
byte[] encodedBytes = Base64.getEncoder().encode(input_file);
By doing so, you are trying to encode those bytes again.
Directly decode the input_file array and then save the obtained byte array into a .pdf file.
Update:
The ConvertedJPGPDF.pdf doesn't really have to be named .pdf. It's really a plain text file considering that it is base 64 encoded.
Anyway, the following piece of code is working for me:
String filePath = "C:\\Users\\xyz\\Desktop\\";
String originalFileName = "ConvertedJPGPDF.pdf";
String newFileName = "test.pdf";
byte[] input_file = Files.readAllBytes(Paths.get(filePath+originalFileName));
byte[] decodedBytes1 = Base64.getMimeDecoder().decode(input_file);
Files.write(Paths.get(filePath+newFileName), decodedBytes1);
Hope this helps!
I need to convert PDF content to Base64 and use that as a String.
When I use the below program to test the out.pdf becomes blank.
byte[] pdfRawData = FileUtils.readFileToByteArray(new File("C:\\in.pdf")) ;
String pdfStr = new String(pdfRawData);
//My data is available in the form of String
BASE64Encoder encoder = new BASE64Encoder();
String encodedPdf = encoder.encode(pdfStr.getBytes());
System.out.println(encodedPdf);
// Decode the encoded content to test
BASE64Decoder decoder = new BASE64Decoder();
FileUtils.writeByteArrayToFile(new File("C:\\out.pdf") , decoder.decodeBuffer(encodedPdf));
Can anyone please help me?
Why are you doing:
String pdfStr = new String(pdfRawData);
instead of passing pdfRawData to the encoder?
Doing so lead to lots of encoding issue, as you don't specify the encoding of the byte array to use to build the string (it will use platform default). And this is clearly redondant (byte array -> string -> byte array)
I need to encode/decode pdf file into Base64 format.
So I read file from disk into String(because I will receive file in String Base64 format in future);
String pdfString = IOUtils.toString(new FileInputStream(new
File("D:\\vrpStamped.pdf")));
byte[] encoded = Base64.encodeBase64(pdfString.getBytes());
byte[] newPdfArray = Base64.decodeBase64(encoded);
FileOutputStream imageOutFile = new FileOutputStream(
"D:\\1.pdf");
imageOutFile.write(newPdfArray);
imageOutFile.close();
imageOutFile.flush();
So my D:\\1.pdf doesnt opens in AdobeReader, but if I read file straight to byte array, using IOUtils.toByteArray(..) instead ,all works fine and my D:\\1.pdf file sucessfuly opens in Adobe Reader:
byte[] encoded = Base64.encodeBase64(IOUtils.toByteArray(new FileInputStream(new File("D:\\vrpStamped.pdf"))););
It seems to me thath IOUtils.toString(..) change something inside file content. So how can I convert file to String with not content breaking?
How to encode a pdf...
byte[] bytes = IOUtils.toByteArray(new FileInputStream(new File("/home/fschaetz/test.pdf")));
byte[] encoded = Base64.encode(bytes);
String str = new String(encoded);
...now do something with this encoded String, for example, send it via a Rest service.
And now, if you receive an encoded String, you can decode and save it like this...
byte[] decoded = Base64.decode(str.getBytes());
FileOutputStream output = new FileOutputStream(new File("/home/fschaetz/result.pdf"));
output.write(decoded);
output.close();
Works perfectly fine with all files, not limited to images or pdfs.
What your example is doing is...
Read the pdf into a String (which pretty much destroys the data, since you are reading binary data into a String)
Encode this spring (which is in all likelyhood not a valid representation of the original pdf anymore)
Decode it and save it to disk
In my C# application, I am having a Bitmap encoded to a base64 string sent over from an android application, then I decode it and set it equal to a byte array.
I get this exception though:
"A first chance exception of type 'System.FormatException' occurred in
mscorlib.dll".
Android Side:
byte[] iconByteArray = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, baos); //Bitmap bitmap created elsewhere
iconByteArray = baos.toByteArray();
encodedIcon = Base64.encodeToString(iconByteArray, Base64.DEFAULT);
return encodedIcon;
C# Side:
byte[] arr = System.Convert.FromBase64String(encodedIcon); //this throws that exception
Does anyone know of the cause? I'm guessing the format of the Base64 string in Java is not able to be decoded so simply by the C# application? It looks like I may have to do something like this and replace some characters? I tried this solution and got the same exception.
The string sent through Android looks like this
"/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAMCAgMCAgMDAwMEAwMEBQgFBQQEBQoHBwYIDAoMDAsK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\n/wChS13/AMFk/wD8RX7cj4m"
Try
encodedIcon = encodedIcon.Replace(#"\n", "");
if(encodedIcon.Length % 4 != 0)
// we may have 0, 1 or 2 padding '='
encodedIcon += new string('=', 4 - encodedIcon.Length % 4);
byte[] arr = System.Convert.FromBase64String(encodedIcon);
According to Base64:
After encoding the non-padded data, if two octets of the 24-bit buffer are padded-zeros, two "=" characters are appended to the output; if one octet of the 24-bit buffer is filled with padded-zeros, one "=" character is appended. This signals the decoder that the zero bits added due to padding should be excluded from the reconstructed data. This also guarantees that the encoded output length is a multiple of 4 bytes.
In this line
encodedIcon = Base64.encodeToString(iconByteArray, Base64.DEFAULT);
you can change Base64.DEFAULT to Base64.NOWRAP
It removing \n from the encoded string.