jQuery-Easyui 多级菜单 前后台

后台代码:

package com.yundaex.settlement.tree;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.struts2.ServletActionContext;

import com.google.gson.Gson;


/**
* @author Administrator
*
*/
public class TreeAction {

     /**
     *
     */
     private static final long serialVersionUID = 1L;
    
     List<Map<String,Object>> parentList  =new ArrayList<Map<String,Object>>();
    
     public String createTree(){
          ServletActionContext.getResponse().setContentType("text/plain;charset=utf-8");

         
               List<Tree> list=new ArrayList<Tree>();
              
               Tree tre1=new Tree();
               tre1.setId(1);
               tre1.setText("部门管理");
               tre1.setState("closed");              
               tre1.setParent(0);
               list.add(tre1);
    
    
               Tree tre2=new Tree();
               tre2.setId(2);
               tre2.setText("公司管理");
               tre2.setState("closed");
               tre2.setParent(0);
               list.add(tre2);
              
    
               Tree tre3=new Tree();
               tre3.setId(3);
               tre3.setText("商品管理");
               tre3.setState("closed");
               tre3.setParent(0);
               list.add(tre3);
              
               Tree tre4=new Tree();
               tre4.setId(4);
               tre4.setText("部门管理1");
               tre4.setParent(1);