jsp动态导航栏

网站页面的导航栏是从数据库中生成出来的，所以在界面上展示导航栏时，要从数据库中读取出来，但不能每次显示一个页面都从数据库中读，这样就很浪费性能，应该考虑把导航栏放到一个缓存中。如：session、application、memcache等。

对于访问量小的网站，也可以使用如下方法：

@Component
public class NavigationUtil {
	
	public static List<BeautifulClassEntity> beautifulClassList;

	public static List<ActivityClassEntity> activityClassList;
	
	public static List<BeautifulClassEntity> getBeautifulClassList(){
		if(beautifulClassList == null){
			
			beautifulClassList = beautifulClassService.getAllBeautifulClass();
		}
		return beautifulClassList;
	}
	
	public static List<ActivityClassEntity> getActivityClassList(){
		if(activityClassList == null){
			activityClassList = activityService.getActivityList();
		}
		return activityClassList;
	}
	
	private static BeautifulClassService beautifulClassService;
	
	private static ActivityService activityService;

	@Autowired
	public void setBeautifulClassService(BeautifulClassService beautifulClassService) {
		NavigationUtil.beautifulClassService = beautifulClassService;
	}

	@Autowired
	public void setActivityService(ActivityService activityService) {
		NavigationUtil.activityService = activityService;
	}
	
	public String getTest(){
		return "aa";
	}
	
}

<%
	List<BeautifulClassEntity> beautifulList = NavigationUtil.getBeautifulClassList();
	for(BeautifulClassEntity beautiful : beautifulList){
		%>
		<a href="/beautiful/cloth.do?beautifulClassId=<%=beautiful.getId() %>" class="main_title_nav_cur">
			<%=beautiful.getBeautifulName() %>
		</a>
		<%
	}
 %>

以上皆为本人总结所得，如果不妥之处，敬请提出，共同学习。。。