Пример Java encoding и decoding с использованием Apache Base64

<!-- http://mvnrepository.com/artifact/org.apache.axis/axis -->
<dependency>
    <groupId>org.apache.axis</groupId>
    <artifactId>axis</artifactId>
    <version>1.4</version>
</dependency>

package org.o7planning.example.encode;

import java.io.UnsupportedEncodingException;

import org.apache.axis.encoding.Base64;

public class EncodeDecodeExample {

   // Encode
   public static String encodeString(String text)
           throws UnsupportedEncodingException {
       byte[] bytes = text.getBytes("UTF-8");
       String encodeString = Base64.encode(bytes);
       return encodeString;
   }

   // Decode
   public static String decodeString(String encodeText)
           throws UnsupportedEncodingException {
       byte[] decodeBytes = Base64.decode(encodeText);
       String str = new String(decodeBytes, "UTF-8");
       return str;
   }
   
   
   public static void main(String[] args) throws UnsupportedEncodingException  {
       String text = "Example Vietnamese text - Tiếng Việt";
       
       System.out.println("Text before encode: "+ text);
       
       String encodeText = encodeString(text);
       System.out.println("Encode text: "+ encodeText);
       
       String decodeText =  decodeString(encodeText);
       System.out.println("Decode text: "+ decodeText);        
   }

}