url参数和map之间的转换

         /**
	 * 将url参数转换成map
	 * @param param aa=11&bb=22&cc=33
	 * @return
	 */
	public static Map getUrlParams(String param) {
		Map map = new HashMap(0);
		if (StringUtils.isBlank(param)) {
			return map;
		}
		String[] params = param.split("&");
		for (int i = 0; i < params.length; i++) {
			String[] p = params[i].split("=");
			if (p.length == 2) {
				map.put(p[0], p[1]);
			}
		}
		return map;
	}

	/**
	 * 将map转换成url
	 * @param map
	 * @return
	 */
	public static String getUrlParamsByMap(Map map) {
		if (map == null) {
			return "";
		}
		StringBuffer sb = new StringBuffer();
		for (Map.Entry entry : map.entrySet()) {
			sb.append(entry.getKey() + "=" + entry.getValue());
			sb.append("&");
		}
		String s = sb.toString();
		if (s.endsWith("&")) {
			s = org.apache.commons.lang.StringUtils.substringBeforeLast(s, "&");
		}
		return s;
	}

http://dh189.iteye.com/blog/752477