Base64 Java encode and decode a string

Question

I want to encode a string into base64 and transfer it through a socket and decode it back    But after decoding it gives different answer    Following is my code and result is  77 9x6s    import javax xml bind DatatypeConverter       public class f          public static void main String a                String str   new String DatatypeConverter parseBase64Binary  user 123               String res   DatatypeConverter printBase64Binary str getBytes               System out println res                    Any idea about how to implement this

User · Answer

import javax xml bind DatatypeConverter   public class f      public static void main String a            String str   new String DatatypeConverter printBase64Binary new String  user 123   getBytes            String res   DatatypeConverter parseBase64Binary str         System out println res

User · Answer

The accepted answer uses the Apache Commons package but this is how I did it using Java s native libraries  Java 11 and up  import java util Base64   public class Base64Encoding        public static void main String   args            Base64 Encoder enc   Base64 getEncoder            Base64 Decoder dec   Base64 getDecoder            String str    77 9x6s                encode data using BASE64         String encoded   enc encodeToString str getBytes             System out println  encoded value is  t    encoded               Decode data         String decoded   new String dec decode encoded            System out println  decoded value is  t    decoded           System out println  original value is  t    str             Java 6 - 10  import java io UnsupportedEncodingException      import javax xml bind DatatypeConverter   public class EncodeString64       public static void main String   args  throws UnsupportedEncodingException            String str    77 9x6s               encode data using BASE64         String encoded   DatatypeConverter printBase64Binary str getBytes             System out println  encoded value is  t    encoded               Decode data          String decoded   new String DatatypeConverter parseBase64Binary encoded            System out println  decoded value is  t    decoded            System out println  original value is  t    str             The better way would be to try catch the encoding decoding steps but hopefully you get the idea

User · Answer

You can use following approach   import org apache commons codec binary Base64      Encode data on your side using BASE64 byte   bytesEncoded   Base64 encodeBase64 str getBytes     System out println  encoded value is     new String bytesEncoded        Decode data on other side  by processing encoded data byte   valueDecoded   Base64 decodeBase64 bytesEncoded   System out println  Decoded value is     new String valueDecoded      Hope this answers your doubt

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Java 8 now supports BASE64 Encoding and Decoding  You can use the following classes  java util Base64  java util Base64 Encoder and java util Base64 Decoder   Example usage      encode with padding String encoded   Base64 getEncoder   encodeToString someByteArray       encode without padding String encoded   Base64 getEncoder   withoutPadding   encodeToString someByteArray       decode a String byte    barr   Base64 getDecoder   decode encoded

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For Spring Users   Spring Security has a Base64 class in the org springframework security crypto codec package that can also be used for encoding and  decoding of Base64  Ex    public static String base64Encode String token        byte   encodedBytes   Base64 encode token getBytes         return new String encodedBytes  Charset forName  UTF-8         public static String base64Decode String token        byte   decodedBytes   Base64 decode token getBytes         return new String decodedBytes  Charset forName  UTF-8

User · Answer

The following is a good solution -   import android util Base64   String converted   Base64 encodeToString toConvert toString   getBytes    Base64 DEFAULT    String stringFromBase   new String Base64 decode converted  Base64 DEFAULT      That s it  A single line encoding and decoding

[java] Base64 Java encode and decode a string

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