public void excute() {
		String url = baseurl + category;
		System.out.println(url);
		Document html = WebClient.getHtmlByUrl(url);
		Elements group_elements = html
				.select("div[class=all_lanmu ping] > ul > li");
		for (Element e : group_elements) {
			// claw each group
			clawEachGroup(e.select("a").first().attr("href"));
		}
		Elements page_bar = html.select("div.page1 > a");
		if (page_bar.isEmpty())
			return;
		while (page_bar.last().previousElementSibling().hasAttr("href")) {
			url = baseurl + page_bar.last().attr("href");
			html = WebClient.getHtmlByUrl(url);
			group_elements = html.select("div[class=all_lanmu ping] > ul > li");
			for (Element e : group_elements) {
				// claw each group
				clawEachGroup(e.select("a").first().attr("href"));
			}
			page_bar = html.select("div.page1 > a");
		}
	}