Write Base64-encoded image to file

Question

How to write a Base64-encoded image to file   I have encoded an image to a string using Base64  First  I read the file  then convert it to a byte array and then apply Base64 encoding to convert the image to a string   Now my problem is how to decode it   byte dearr     Base64 decodeBase64 crntImage   File outF   new File  c  decode abc bmp    BufferedImage img02   ImageIO write img02   bmp   outF      The variable crntImage contains the string representation of the image

User · Answer

import java util Base64         Just making it clear that this answer uses the java util Base64 package  without using any third-party libraries   String crntImage  lt a valid base 64 string gt   byte   data   Base64 getDecoder   decode crntImage    try  OutputStream stream   new FileOutputStream  d  temp abc pdf           stream write data     catch  Exception e        System err println  Couldn t write to file

User · Answer

No need to use BufferedImage  as you already have the image file in a byte array           byte dearr     Base64 decodeBase64 crntImage       FileOutputStream fos   new FileOutputStream new File  c  decode abc bmp          fos write dearr        fos close

User · Answer

Try this   import java awt image BufferedImage  import java io File  import java io IOException  import java net URL  import javax imageio ImageIO   public class WriteImage           public static void main  String   args                 BufferedImage image   null          try                URL url   new URL  URL IMAGE                image   ImageIO read url                ImageIO write image   jpg  new File  C   out jpg                 ImageIO write image   gif  new File  C   out gif                 ImageIO write image   png  new File  C   out png                catch  IOException e                e printStackTrace                      System out println  Done

User · Answer

Other option using apache-commons   import org apache commons codec binary Base64  import org apache commons io FileUtils       File file   new File   path     byte   bytes   Base64 decodeBase64   base64     FileUtils writeByteArrayToFile  file  bytes

User · Answer

Assuming the image data is already in the format you want  you don t need image ImageIO at all - you just need to write the data to the file      Note preferred way of declaring an array variable byte   data   Base64 decodeBase64 crntImage   try  OutputStream stream   new FileOutputStream  c  decode abc bmp          stream write data        I m assuming you re using Java 7 here - if not  you ll need to write a manual try finally statement to close the stream    If the image data isn t in the format you want  you ll need to give more details

User · Answer

With Java 8 s Base64 API byte   decodedImg   Base64 getDecoder                        decode encodedImg getBytes StandardCharsets UTF 8    Path destinationFile   Paths get  quot  path to imageDir quot    quot myImage jpg quot    Files write destinationFile  decodedImg    If your encoded image starts with something like data image png base64 iVBORw0     you ll have to remove the part  See this answer for an easy way to do that

[java] Write Base64-encoded image to file

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