base64算法加密 、解密

public class Base64Utils { // 加密      public static String getBase64(String str) {          byte[] b = null;          String s = null;          try {              b = str.getBytes("utf-8");          } catch (UnsupportedEncodingException e) {              e.printStackTrace();          }          if (b != null) {              s = new BASE64Encoder().encode(b);          }          return s;      }        // 解密      public static String getFromBase64(String s) {          byte[] b = null;          String result = null;          if (s != null) {              BASE64Decoder decoder = new BASE64Decoder();              try {                  b = decoder.decodeBuffer(s);                  result = new String(b, "utf-8");              } catch (Exception e) {                  e.printStackTrace();              }          }          return result;      }  }