java实现遍历树形菜单两种实现代码分享

package org.web;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.dao.BaseHibernateDao;
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class OpenSessionView extends BaseHibernateDao implements Filter {
	/**(非 Javadoc)
	 * 
Title: destroy
	 * 
Description(描述): 
	 * @see javax.servlet.Filter#destroy()
	 */
	@Override
		public void destroy() {
		// TODO Auto-generated method stub
	}
	/**(非 Javadoc)
	 * 
Title: doFilter
	 * 
Description(描述): 
	 * @param arg0
	 * @param arg1
	 * @param arg2
	 * @throws IOException
	 * @throws ServletException
	 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
	 */
	@Override
		public void doFilter(ServletRequest arg0, ServletResponse arg1,
				FilterChain arg2) throws IOException, ServletException {
		Session session = null;
		Transaction tx = null;
		try {
			session = getSession();
			tx = session.beginTransaction();
			arg2.doFilter(arg0, arg1);
			tx.commit();
		}
		catch (Exception e) {
			e.printStackTrace();
			tx.rollback();
		}
		finally{
			closeSession();
		}
	}
	/**(非 Javadoc)
	 * 
Title: init
	 * 
Description(描述): 
	 * @param arg0
	 * @throws ServletException
	 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
	 */
	@Override
		public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
	}
}

package org.web;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.Service.IVoteTreeService;
import org.Service.impl.VoteTreeServiceImpl;
import com.alibaba.fastjson.JSON;
import com.opensymphony.xwork2.ActionSupport;
public class TreeAction extends ActionSupport {
	private JSONArray treejson;
	private IVoteTreeService voteService = new VoteTreeServiceImpl();
	public String getTree(){
		treejson = voteService.getTreeJson();
		return SUCCESS;
	}
	public JSONArray getTreejson() {
		return treejson;
	}
	public void setTreejson(JSONArray treejson) {
		this.treejson = treejson;
	}
}