zTree树形插件异步加载方法详解

public void getMenusById(){
    List list=null;
    try {
      list=ztreeService.getMenusById(ztree);
    } catch (Exception e) {
      e.printStackTrace();
    }
    super.writeJson(list);
}

public List getMenusById(Ztree ztree) throws Exception;
//接口

//service代码，几本都可以复制使用


package com.jk.service.impl;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.jk.dao.ZtreeDao;
import com.jk.model.Ztree;
import com.jk.service.ZtreeService;
@Repository("ztreeService")
public class ZtreeServiceImpl implements ZtreeService {
  
  @Autowired
  private ZtreeDao ztreeDao;

  @Override
  public List queryList(Ztree ztree) throws Exception {
    String hql=" from Ztree where 1=1 ";
    Map params = new HashMap();
//传的对象是否为空，拼接sql+id
      if(ztree.getId()!=null){
        hql+=" and id = :id ";
        params.put("id",ztree.getId());
      }
    
    
    return ztreeDao.queryList(hql, params);
  }
  //递归查询
  @Override
  public List getMenusById(Ztree ztree) throws Exception {
    String hql=" from Ztree where 1=1 ";
    Map params=new HashMap();
    if(ztree.getId()==null||ztree.getId().equals("")){
      hql+=" and pid is null ";
    }else{
      hql+= " and pid = :id ";
      params.put("id",ztree.getId());
    }
    List queryZtree = ztreeDao.queryList(hql, params);
    List list=new ArrayList();
    for(Ztree ztree2:queryZtree){
      if(queryBoolean(ztree2)){
        ztree2.setIsParent("true");
      }
      list.add(ztree2);
    }
    return list;
  }
  //熟悉递归的朋友应该可以看懂，我就不解释了，我也聊不清楚这个递归，不误导了，代码在这，可以复制进去直接运行，
  public boolean queryBoolean(Ztree ztree) throws Exception{
    boolean flag=false;
    String hql= " from Ztree where pid = :id ";
    
    Map params=new HashMap();
    params.put("id", ztree.getId());
    List queryZtree = ztreeDao.queryList(hql, params);
    if(queryZtree!=null&&queryZtree.size()>0){
      flag=true;
    }
    return flag;
  }

  
}