Base64 String to byte [] in java

Question

I am trying to convert a base64 String to an array of bytes, but it throws the following error

java.lang.IllegalArgumentException: Illegal base64 3a character

I tried the following options: userimage - base64 string

byte[] img1 = org.apache.commons.codec.binary.Base64.decodeBase64(userimage);`

/* byte[] decodedString = Base64.getDecoder().decode(encodedString.getBytes(UTF_8));*/
/* byte[] byteimage =Base64.getDecoder().decode( userimage );*/
/* byte[] byteimage =  Base64.getMimeDecoder().decode(userimage);*/`

Answer 1

You can use the java.util.Base64 package to decode a string into bytes []. Below is the code that I used for encoding and decoding.

For Java 8: com.test package;

import java.io.UnsupportedEncodingException;
import java.util.Base64;

public class Example {

    public static void main(String[] args) {
        try {
            byte[] name = Base64.getEncoder().encode("hello World".getBytes());
            byte[] decodedString = Base64.getDecoder().decode(new String(name).getBytes("UTF-8"));
            System.out.println(new String(decodedString));
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

For Java 6:

import java.io.UnsupportedEncodingException;

import org.apache.commons.codec.binary.Base64;

public class Main {

    public static void main(String[] args) {
        try {
            byte[] name = Base64.encodeBase64("hello World".getBytes());
            byte[] decodedString = Base64.decodeBase64(new String(name).getBytes("UTF-8"));
            System.out.println(new String(decodedString));
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}