实例：Easyui的combobox实现动态数据级联

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();
%>






















	
	
	

	  


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