Java实现base64码、字符串、字节数组之间互相转换

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import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder;   import java.io.UnsupportedEncodingException; import java.util.Base64;   public class Base64Util {     /**      * String转换为Bse64      * @param str      * @return      */     public static String strConvertBase(String str) {         if(null != str){             Base64.Encoder encoder = Base64.getEncoder();             return encoder.encodeToString(str.getBytes());         }         return null;     }       /**      * Base64转换成String      * @param str      * @return      */     public static String baseConvertStr(String str) {         if(null != str){             Base64.Decoder decoder = Base64.getDecoder();             try {                 return new String(decoder.decode(str.getBytes()), "UTF-8");             } catch (UnsupportedEncodingException e) {                 return null;             }         }         return null;     }       /**      * base 64 encode      *      * @param bytes      *            待编码的byte[]      * @return 编码后的base 64 code      */     public static String base64Encode(byte[] bytes) {         return new BASE64Encoder().encode(bytes);     }       /**      * base 64 decode      *      * @param base64Code      *            待解码的base 64 code      * @return 解码后的byte[]      * @throws Exception      */     public static byte[] base64Decode(String base64Code) throws Exception {         return new BASE64Decoder().decodeBuffer(base64Code);     }   }