common-codec加解密base64

public class Base64 {
  @org.junit.Test
    public void encodeStr(){
        String str="Hello";
            org.apache.commons.codec.binary.Base64 base64=new org.apache.commons.codec.binary.Base64(); 
            String base64Str=new String(base64.encode(str.getBytes()));
            System.out.println(base64Str);
        }

        @org.junit.Test
        public void decodeStr(){
            String base64Str="SGVsbG8=";
            org.apache.commons.codec.binary.Base64 base64=new org.apache.commons.codec.binary.Base64();
            String str=new String(base64.decode(base64Str.getBytes()));
            System.out.println(str);
        }
    }