Java - Convert image to Base64

Question

I m having a problem while converting a gif image to a base 64 string   When I converts it  the code adds me like 100 000 AAAAAA whereas the image is really small   Here is my code   import java io BufferedWriter  import java io File  import java io FileInputStream  import java io FileWriter  import java util ArrayList   public class Main        public static void main String   args                try                       FileWriter fstream   new FileWriter    out txt                BufferedWriter out   new BufferedWriter fstream                File folder   new File    flags                 File   listOfFiles   folder listFiles                 for  int i   0  i  lt  listOfFiles length  i                                  if  listOfFiles i  isFile                                          Main readFile out  listOfFiles i                                                 out close                System out println  Done                      catch  Exception e                public static void readFile BufferedWriter out  File file                try                       byte   byteArray   new byte 102400               FileInputStream fis   new FileInputStream file               String base64String              int bytesRead   0              while   bytesRead   fis read byteArray      -1                                new String byteArray  0  bytesRead                   base64String   Base64 encode byteArray                   out write  public static ImageIcon getFlag    file getName                            out newLine                    out write                       out newLine                    ArrayList lt String gt  array   Main cut base64String                   out write  return Utils toImage       array get 0                           for  int i 1  i lt array size  -1  i                                          out write   lt tab gt        array get i                                             out write   lt tab gt       array get array size   - 1                             out newLine                    out write                       out newLine                    out newLine                                    catch  Exception e                        e printStackTrace                         public static ArrayList lt String gt  cut String in                ArrayList lt String gt  array   new ArrayList lt String gt             while  in length    gt  76                        array add  in substring 0  77                 in   in substring 77                     return array            Basicaly  it writes in a text file out txt a bunch of java methods with the base 64 code inside   Here is a  small  part of the output   return Utils toImage  R0lGODlhEAALANUAANPTAPZva n5AfLySPz8iYqY3O01NgoksbGZa kYGOskJKi05vb2XZ r4 05O  lt tab gt   Pv7eO3tKPv7bZak4dSvebC76tC2iPNISPX1UMkAAMm6U NWTeYAAF5y1LqlevNaWpSh3e7uQ 1CQt  lt tab gt   gAAKOv5Vds1C1IvpGf37a 7OnTYZ6q6NGkamd71 LyPusvLvFiTEFbx9rPb HuaczATd7eAPAAAH2  lt tab gt   N2vE PMqiYuXQUsKufJqn4jlRxUlhy CpelFnz PxbyH5BAAAAAAALAAAAAAQAAsAAAaQwBVnSBIY  lt tab gt   jzTaZsk5OSmEKOHxCAQ8nk1zMUo9Ir8Y42Kx2Dyi5qihi1QqkxzZZtCISBS2JNILoFQDdC0WIj4UO  lt tab gt   hImDBMoLjcsBi0KISI8C4kFMB0uOAgykgkOGC8LJgUFFx0IqxAKCQkGGDsjpzUDLBkZEBCvCS0YJW  lt tab gt   wfBQxjAyAgDpG OwfOBzPRANMY1dVBADsAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt   AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  lt tab gt    Thanks   Edit  I m using the base64 code from this question  https   stackoverflow com a 4265472 1295422

User · Answer

You can use the file Object to get the length of the file to initialize your array   int length   Long valueOf file length    intValue    byte   byteArray   new byte length

User · Answer

You can create a large array and then copy it to a new array using System arrayCopy          int contentLength   100000000          byte   byteArray   new byte contentLength            BufferedInputStream inputStream   new BufferedInputStream connection getInputStream             while   bytesRead   inputStream read       -1                        byteArray count       byte bytesRead                     byte   destArray   new byte count           System arraycopy byteArray  0  destArray   0  count     destArray will contain the information you want

User · Answer

The line  base64String   Base64 encode byteArray     converts the full array  102400 bytes  to Base64  not just the number of bytes you have read  You need to pass it the numbers of bytes

User · Answer

byte   byteArray   new byte 102400    base64String   Base64 encode byteArray     That code will encode 102400 bytes  no matter how much data you actually use in the array    while   bytesRead   fis read byteArray      -1    You need to use the value of bytesRead somewhere   Also  this may not read the whole file into the array in one go  it only reads as much as is in the I O buffer   so your loop will probably not work  you may end up with half an image in your array   I d use Apache Commons IOUtils here    Base64 encode FileUtils readFileToByteArray file

User · Answer

To begin with  this line of code   while   bytesRead   fis read byteArray      -1    is equivalent to   while   bytesRead   fis read byteArray  0  byteArray length      -1    So it s writing into the byteArray from offset 0  rather than from where you wrote to before   You need something like this   int offset   0  int bytesRead   0   while   bytesRead   fis read byteArray  offset  byteArray length - offset     -1        offset    bytesRead      After you have read the data  bytes  in then  you can convert it to Base64   There are bigger problems though - you re using a fixed size array  so files that are too big won t be converted correctly  and the code is tricker because of it too   I would ditch the byte array and go with something like this   ByteArrayOutputStream buffer   new ByteArrayOutputStream       commons-io IOUtils IOUtils copy fis  buffer   byte    data   buffer toByteArray    Base64 encode data     Or condense it further as Thilo has with FileUtils

User · Answer

I realize that this is an old question but perhaps someone will find my code sample useful  This code encodes a file in Base64 then decodes it and saves it in a new location   import java io IOException  import java nio file Files  import java nio file Path  import java nio file Paths  import java util Arrays   import org apache commons codec binary Base64   public class Base64Example        public static void main String   args             Base64Example tempObject   new Base64Example                convert file to regular byte array         byte   codedFile   tempObject convertFileToByteArray  your input file path                encoded file in Base64         byte   encodedFile   Base64 encodeBase64 codedFile               print out the byte array         System out println Arrays toString encodedFile                print the encoded String         System out println encodedFile               decode file back to regular byte array         byte   decodedByteArray   Base64 decodeBase64 encodedFile               save decoded byte array to a file         boolean success   tempObject saveFileFromByteArray  your output file path   decodedByteArray               print out success         System out println  success       success              public byte   convertFileToByteArray String filePath             Path path   Paths get filePath            byte   codedFile   null           try               codedFile   Files readAllBytes path             catch  IOException e                e printStackTrace                       return codedFile             public boolean saveFileFromByteArray String filePath  byte   decodedByteArray             boolean success   false           Path path   Paths get filePath            try               Files write path  decodedByteArray               success   true            catch  Exception e                e printStackTrace                       return success

User · Answer

Late GraveDig     Just constrain your byte array to the file size   FileInputStream fis   new FileInputStream  file    byte   byteArray  new byte  int  file length

User · Answer

new String byteArray  0  bytesRead   does not modify the array  You need to use System arrayCopy to trim the array to the actual data size  Otherwise you are processing all 102400 bytes most of which are zeros

[java] Java - Convert image to Base64

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