public static String toParams(Map<String, ?> paramMap) {
		return toParams(paramMap, CharsetUtil.CHARSET_UTF_8);
	}
@Test
	public void toParamsTest() {
		final String paramsStr = "uuuu=0&a=b&c=3Ddsssss555555";
		final Map<String, List<String>> map = HttpUtil.decodeParams(paramsStr, CharsetUtil.UTF_8);

		final String encodedParams = HttpUtil.toParams(map);
		assertEquals(paramsStr, encodedParams);
	}