Decoding a Base64 string in Java

Question

I m trying to decode a simple Base64 string  but am unable to do so   I m currently using the org apache commons codec binary Base64 package   The test string I m using is  abcdefg  encoded using PHP YWJjZGVmZw     This is the code I m currently using   Base64 decoder   new Base64    byte   decodedBytes   decoder decode  YWJjZGVmZw      System out println new String decodedBytes      n          The above code does not throw an error  but instead doesn t output the decoded string as expected

User · Answer

The following should work with the latest version of Apache common codec

byte[] decodedBytes = Base64.getDecoder().decode("YWJjZGVmZw==");
System.out.println(new String(decodedBytes));

and for encoding

byte[] encodedBytes = Base64.getEncoder().encode(decodedBytes);
System.out.println(new String(encodedBytes));

User · Answer

Modify the package you re using   import org apache commons codec binary Base64    And then use it like this   byte   decoded   Base64 decodeBase64  YWJjZGVmZw      System out println new String decoded   UTF-8       n

User · Answer

If you don t want to use apache  you can use Java8   byte   decodedBytes   Base64 getDecoder   decode  YWJjZGVmZw       System out println new String decodedBytes      n

User · Answer

Commonly base64 it is used for images  if you like to decode an image  jpg in this example with org apache commons codec binary Base64 package    byte   decoded   Base64 decodeBase64 imageJpgInBase64   FileOutputStream fos   null  fos   new FileOutputStream  C   output  image jpg    fos write decoded   fos close

[java] Decoding a Base64 string in Java

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