将PDF文件的内容转换为Java中的Base 64，反之亦然

Question

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?

Answer 1

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)