findaction.java

实现动态加载菜单

package com.test.struts.action;

import java.io.UnsupportedEncodingException;
import java.util.List;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import net.sf.navigator.menu.MenuComponent;
import net.sf.navigator.menu.MenuRepository;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.Hibernate.MenuItem;
import com.Hibernate.SessionFactory;

public class FindAction extends Action {

	public ActionForward execute(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,
		HttpServletResponse response) {
		try{
			request.setCharacterEncoding("GB2312");
		}catch ( Exception e ){}
		//创建连接
		Session session=SessionFactory.currentSession();
		//创建事务
		Transaction tx=session.beginTransaction();
		//创建对话
		Query query=session.createQuery("FROM MenuItem m order by id");
		List list=query.list();
		//事务提交
		tx.commit();
		if(list.size()<0)
			return mapping.getInputForward();
		MenuRepository repository = new MenuRepository();
		HttpSession httpsession=(HttpSession)request.getSession();
		ServletContext application=(ServletContext)httpsession.getServletContext();
		MenuRepository defaultRepository = (MenuRepository)application.getAttribute(MenuRepository.MENU_REPOSITORY_KEY);
		repository.setDisplayers(defaultRepository.getDisplayers());
 		for (int i=0; i < list.size(); i++) {
 			MenuComponent mc = new MenuComponent();
 			MenuItem mi=(MenuItem) list.get(i);
 			String name = mi.getName();
            mc.setName(name);
            String parent = (String) mi.getParentName();
            //System.out.println(name + ", parent is: " + parent);
            if (parent != null) {
                MenuComponent parentMenu = repository.getMenu(parent);
                if (parentMenu == null) {
                    //System.out.println("parentMenu '" + parent + "' doesn't exist!");
                    // create a temporary parentMenu
                    parentMenu = new MenuComponent();
                    parentMenu.setName(parent);
                    repository.addMenu(parentMenu);
                }
                mc.setParent(parentMenu);
            }
            String title = (String)mi.getTitle();
            try {
				title=new String( title.getBytes("ISO8859_1") );
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
            mc.setTitle(title);
            String location = (String) mi.getLocation();
            String target = (String)mi.getTarget();
            //System.out.println( "name:" + name + ",location:" + location );
            if ( location != null )
            	mc.setLocation(location);
            if ( target!= null )
	            mc.setTarget( target );
            repository.addMenu(mc);
		}
 		request.setAttribute("repository", repository);
		return mapping.findForward("okGo");
	}
}