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)	 * <p>Title: destroy</p>	 * <p>Description(描述): </p>	 * @see javax.servlet.Filter#destroy()	 */	@Override		public void destroy() {		// TODO Auto-generated method stub	}	/**(非 Javadoc)	 * <p>Title: doFilter</p>	 * <p>Description(描述): </p>	 * @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)	 * <p>Title: init</p>	 * <p>Description(描述): </p>	 * @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;	}}