Solved

How to encode a binary and text file into a string

Posted on 2004-08-16
7
211 Views
Last Modified: 2010-03-31
I'm using the java commons base64 api.  Here is what i need to do.  My program creates a pdf and html file.  I need to base64 encode each file into a string and then store it into a text field in a database.  and at a later date retrieve it and decode it and store it back into the file type it should be.   But i'm not quite to sure.  Here is what i have so far:

                   File file = new File( "D:/projects/base64code/test.pdf" );
                   File fileOut = new File( "D:/projects/base64code/test_out.pdf" );

                   byte[] scratch = new byte[8*1024];

                   FileInputStream in = new FileInputStream(file);
                   FileOutputStream out = new FileOutputStream(fileOut);

//                    These next two give you super turbo performance speed
                   BufferedInputStream bin = new BufferedInputStream(in);
                   BufferedOutputStream bout = new BufferedOutputStream(out);

//                    If you don't loop, then you're probably losing data
                   int consumed = 0;
                   do {
                        consumed = bin.read( scratch );
                        if ( consumed > 0 )
                        {
                            bout.write( scratch, 0, consumed );
                        }
                   } while ( consumed >= 0 );
                  
                   byte[] encodedArray = Base64.encodeBase64( scratch );
                  
                  
                   byte[] decodeArray = new byte[8*1024];
                   decodeArray = Base64.decodeBase64(encodedArray);


So what i'm trying to do in this example is:
1.  Encode the pdf file.
2.  Retrieve the string value so i can store it into a column in a database table ( I'm not sure how to do that here)
3.  Take the string value (just to test that i can convert back to a byte and decode) and convert into a byte then save to the appropriate file name.

Thanks in advance.
0
Comment
Question by:borg48
  • 3
7 Comments
 
LVL 35

Expert Comment

by:girionis
Comment Utility
You need to encode your byte array. Lets say that your byte array that holds the pdf is called "pdfInBytes" you can do:

String encodedString = BASE64Encoder().encode(pdfInBytes);

To decode it back to a bytes array you use:

bytes [] decodedPDF = BASE64Decoder().decodeBuffer(endodedString);
0
 
LVL 35

Expert Comment

by:girionis
Comment Utility
You might also want to take a look here: http://javaalmanac.com/egs/java.net/Base64.html
0
 
LVL 9

Expert Comment

by:Venci75
Comment Utility
If the only reason for encoding a binary file is that you have to store it into a database, you can use BLOB field
0
 

Author Comment

by:borg48
Comment Utility
How would i then take the byte:
bytes [] decodedPDF = BASE64Decoder().decodeBuffer(endodedString);

and output it back to a file?
0
 
LVL 35

Accepted Solution

by:
girionis earned 125 total points
Comment Utility
You can use a FileOutputStream and use one of its write methods that take a byte array as a parameter.
0

Featured Post

Do You Know the 4 Main Threat Actor Types?

Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
noX challenge 17 75
json format text only 4 64
for i loop in grovy 1 32
Securing Jmx Console and web console 2 45
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now