java 面包屑导航

类似面包屑导航，抛砖引玉

后台维护一个访问路径的列表

	public void siteMap(HttpServletRequest request){
		String come_url = request.getHeader("referer");
		String current_url = request.getRequestURL()+(request.getQueryString()==null?"":"?"+request.getQueryString());
		if(come_url!=null){
			LinkedList<String> url_lklist = (request.getSession().getAttribute("url_lklist")==null)?new LinkedList<String>():(LinkedList)request.getSession().getAttribute("url_lklist");
	    	boolean isaddcome = true;
	    	for(String item:url_lklist) if(item.equals(come_url)) isaddcome = false;
	    	if(isaddcome) url_lklist.add(come_url);
	    	url_lklist.add(current_url);
	    	int j = 0;
	    	for(String item:url_lklist){
	    		j++; if(item.equals(current_url)) url_lklist.subList(j, url_lklist.size()).clear();  
	    	}
			request.getSession().setAttribute("url_lklist", url_lklist);
			request.setAttribute("_href", url_lklist.get(url_lklist.size()-2));
		}
	}

需要重新刷新时清空列表

		request.getSession().setAttribute("url_lklist",new LinkedList<String>());