char[]与byte[]之间转换

主要是解码器的选择
1、char[]->byte[]

private byte[] getBytes (char[] chars) {
   Charset cs = Charset.forName ("UTF-8");
   CharBuffer cb = CharBuffer.allocate (chars.length);
   cb.put (chars);
   cb.flip ();
   ByteBuffer bb = cs.encode (cb);  
   return bb.array();
}

2、byte[]->char[]

private char[] getChars (byte[] bytes) {
      Charset cs = Charset.forName ("UTF-8");
      ByteBuffer bb = ByteBuffer.allocate (bytes.length);
      bb.put (bytes);
      bb.flip ();
      CharBuffer cb = cs.decode (bb);
      return cb.array();
}