学步园

实现从数据库中动态获取对应的List集合，并在Easyui的combobox中显示出来。

实现的效果如下：

1、数据库的表设计如图所示

2、数据库中填写相关的数据，如图所示。如图所示【法律法规】是所属栏目，因此他的字段parentid是0。【中国公民出国】、【内地居民往来港澳】是属于法律法规的类别。因此他们的字段parentid是对应1，【法律法规】的字段categoryid是1.

3、相关的配置：已经在前面的博客中写了http://blog.csdn.net/lhq13400526230/article/details/9158111

这里就不多写。只把关键代码贴出来。

4、对应的Action代码

package crj.portal.web.management.action;


import java.io.IOException;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;

import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.hibernate.Criteria;
import org.hibernate.criterion.Order;

import com.sun.tools.javac.util.Log;

import crj.portal.web.management.model.Cpersontypetbl;
import crj.portal.web.management.service.CategoryService;
import crj.portal.web.management.service.ItemService;
import crj.portal.web.management.service.UserService;


public class ItemManageAction  {


	Logger log=Logger.getLogger(this.getClass());
	
	private String page;
	private String rows;
	
	private String lanmuid;
	
	private ItemService itemService;// 依赖注入
	
	
	//下拉框--查询栏目
	public String categorytbl() throws Exception{
		List list=itemService.queryLanMu();
		this.toJsonArray(list);
		return null;
	}
	
	//根据栏目的ID 查询拥有的类别
	public String leibie() throws Exception{
		List list=itemService.queryLeiBie(lanmuid);
		this.toJsonArray(list);
		return null;
	}
	
	public String toJsonArray(List list) throws IOException{
		HttpServletResponse response = ServletActionContext.getResponse();
		HttpServletRequest request = ServletActionContext.getRequest();
	
		JSONArray json = JSONArray.fromObject(list);
		log.info("JSON格式：" +json.toString()); 
        response.setCharacterEncoding("utf-8");// 指定为utf-8
	    response.getWriter().write(json.toString());// 转化为JSOn格式
		return null;
	}
	
	public String save() throws Exception {
		return this.alllist();
	}


	public ItemService getItemService() {
		return itemService;
	}

	public void setItemService(ItemService itemService) {
		this.itemService = itemService;
	}

	public String getPage() {
		return page;
	}

	public void setPage(String page) {
		this.page = page;
	}

	public String getRows() {
		return rows;
	}

	public void setRows(String rows) {
		this.rows = rows;
	}

	public UserService getUserService() {
		return userService;
	}

	public void setUserService(UserService userService) {
		this.userService = userService;
	}

	public CategoryService getCategoryService() {
		return categoryService;
	}

	public void setCategoryService(CategoryService categoryService) {
		this.categoryService = categoryService;
	}

	public String getLanmuid() {
		return lanmuid;
	}

	public void setLanmuid(String lanmuid) {
		this.lanmuid = lanmuid;
	}
	
	

}

5、对应的接口代码

public interface ItemService {
	
	//下拉框--查询栏目
	public List queryLanMu() throws Exception;
	
	//下拉框--查询类别
	public List queryLeiBie(String ids) throws Exception;		
	
}

6、对应的接口实现类代码

public class ItemServiceImpl implements ItemService {
	Logger log = Logger.getLogger(this.getClass());
	private SessionFactory sessionFactory;

	//下拉框--查询栏目
	public List queryLanMu() throws Exception {
		Criteria criteria=this.sessionFactory.getCurrentSession().createCriteria(Categorytbl.class);
		criteria.add(Restrictions.eq("parentid", 0));
		criteria.addOrder(Order.asc("categoryid"));
		return criteria.list();
	}

	//下拉框--查询类别
	public List queryLeiBie(String ids) throws Exception {
		int i=Integer.parseInt(ids);
		Criteria criteria=this.sessionFactory.getCurrentSession().createCriteria(Categorytbl.class);
		criteria.add(Restrictions.eq("parentid", i));
		criteria.addOrder(Order.asc("categoryid"));
		return criteria.list();
	}
	public SessionFactory getSessionFactory() {
		return sessionFactory;
	}

	public void setSessionFactory(SessionFactory sessionFactory) {
		this.sessionFactory = sessionFactory;
	}

}

7、对应的JSP代码

<%@ page language="java" errorPage="/error.jsp" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>

<%
	String path = request.getContextPath();
%>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>信息管理</title>
<!-- 引入Jquery -->
<script type="text/javascript" src="<%=path%>/easyui_1.3.2/jquery-1.8.0.min.js" charset="utf-8"></script>
<!-- 引入Jquery_easyui -->
<script type="text/javascript"	src="<%=path%>/easyui_1.3.2/jquery.easyui.min.js" charset="utf-8"></script>
<!-- 引入easyUi国际化--中文 -->
<script type="text/javascript"	src="<%=path%>/easyui_1.3.2/locale/easyui-lang-zh_CN.js"	charset="utf-8"></script>
<!-- 引入easyUi默认的CSS格式--蓝色 -->
<link rel="stylesheet" type="text/css"	href="<%=path%>/easyui_1.3.2/themes/default/easyui.css" />
<!-- 引入easyUi小图标 -->
<link rel="stylesheet" type="text/css"	href="<%=path%>/easyui_1.3.2/themes/icon.css" />

<script type="text/javascript">
    /* 初始化下载表格信息 */
	$(function() {  	
	// 下拉框选择控件，下拉框的内容是动态查询数据库信息
	$('#lanmu').combobox({ 
			    url:'itemManage!categorytbl', 
			    editable:false, //不可编辑状态
			    cache: false,
			    panelHeight: 'auto',//自动高度适合
			    valueField:'categoryid',   
			    textField:'categoryName',
			    
	onHidePanel: function(){
		    $("#leibie").combobox("setValue",'');
			var lanmuid = $('#lanmu').combobox('getValue');		
			
			$.ajax({
				type: "POST",
				url: "itemManage!leibie?lanmuid="+lanmuid,
				cache: false,
				dataType : "json",
				success: function(data){
				$("#leibie").combobox("loadData",data);
							   }
						}); 	
					}
	           }); 
	
	$('#leibie').combobox({ 
	    //url:'itemManage!categorytbl', 
	    editable:false, //不可编辑状态
	    cache: false,
	    panelHeight: 'auto',//自动高度适合
	    valueField:'categoryid',   
	    textField:'categoryName'
	   });
	
	});
</script>


</head>
<body>

	
	<!-- 工具拦 -->
	<div id="tb" style="padding: 3px">
	  <form >

			<span>所属栏目:</span> 
			<select  id="lanmu" class="lanmu" style="width:160px; border: 1px solid #ccc"> </select>
			<span>类别:</span> 
			<select  id="leibie" class="leibie" style="width:160px; border: 1px solid #ccc"> </select>
			
	  </form>
	</div>
	
</body>
</html>