java_easyui体系之Tree的加载(三)

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  • File 3
• File21

initial tree by java script：

Dynamic load tree :

2、TreeAction:

package com.chy.ssh.web.action;

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

import com.chy.ssh.business.bean.TreeDTO;
import com.chy.ssh.business.bean.modal.EasyUITree;
import com.chy.ssh.business.service.TreeService;
import com.chy.ssh.utils.WriteJson;
import com.opensymphony.xwork2.ActionSupport;

public class TreeAction extends ActionSupport {
	
	private static final long serialVersionUID = 1L;
	private TreeService treeService;
	private String id;
	
	public void treeLoad(){
		//从数据库中查询的保存tree的集合、比如id、父类id、text等等、可自己扩展
		List
  
    list = treeService.getTreesByParentId(id);
		//用于前台显示的tree的属性、比如id、state、text、checked等等
		List
   
     eList = new ArrayList
    
     (); if(list.size() != 0){ for(TreeDTO t : list){ EasyUITree e = new EasyUITree(); e.setId(t.getId()); e.setText(t.getText()); Map
     
       attributes = new HashMap
      
       (); attributes.put("url", t.getUrl()); e.setAttributes(attributes); int count = treeService.countChildrens(t.getId()); if(count > 0){ //注意state这个属性、当他为open时、说明这个节点是个文件夹、会以文件夹的形式显示、 //当他是closed的时候、说明这个节点是一个具体的文件节点、不会以文件夹的形式显示。 e.setState("closed"); } eList.add(e); } } id = null; //将含有用于显示tree的信息的集合、转换成json格式、传到前台。 WriteJson.pwObj(eList); } public TreeService getTreeService() { return treeService; } public void setTreeService(TreeService treeService) { this.treeService = treeService; } public String getId() { return id; } public void setId(String id) { this.id = id; } }
      
     
    
   
  

3、底层TreeDAOImpl 中间serveice省略：

package com.chy.ssh.business.dao;

import java.util.ArrayList;
import java.util.List;

import org.springframework.dao.DataAccessException;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.chy.ssh.business.bean.TreeDTO;

public class TreeDAOImpl extends HibernateDaoSupport implements TreeDAO {

	
	
	public int countChildrens(String id) {
		return Integer.parseInt(String.valueOf(this.getHibernateTemplate().find("select count(*) from TreeDTO t where t.pid = '"+id+"'").get(0)));
	}

	@SuppressWarnings("unchecked")
	public List
  
    getTreesByParentId(String id) {
		StringBuffer hql = new StringBuffer();
		if(id == null || "".equals(id)){
			hql.append("from TreeDTO t where t.pid is null ");
		}else{
			hql.append("from TreeDTO t where t.pid = '"+id+"' ");
		}	
		List
   
     list = new ArrayList
    
     (); try { list = this.getHibernateTemplate().find(hql.toString()); } catch (DataAccessException e) { e.printStackTrace(); } return list; } }
    
   
  

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