public static String base64Decode(String base64Str,String encoding) throws IOException{
		byte [] rawByte = base64Str.getBytes(encoding);
		return new String(SecureUtil.base64Decode(rawByte),encoding);	
	}
public static String base64Decode ( String base64Str , String encoding ) throws IOException { byte [ ] rawByte = base64Str . getBytes ( encoding ) ; return new String ( SecureUtil . base64Decode ( rawByte ) , encoding ) ; }
对base64的字符串解base64<br>
@param base64Str<br>
@param encoding<br>
@return<br>
@throws IOException