`

DWR+SSH的下拉框联动

DWRSSHHibernateJavaScriptSpring 
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最近在做一个物流的管理系统用于对以前学习的SSH和其他的知识复习巩固一下，顺便了解一下SHH和DWR的最新功能：

该实现是没有封装的，可以增加同类的js和配置后，可以无限的联动下去

 

1.SHH和DWR的框架搭建就不在详细描述，大家可以在google找到N多！

2.hibernate的实体及配置：
在cn.com.pumkinchina.mapping下建类
public class Province {
 
  //省ID
  private Long provinceid;
 
 //省名
 private String provincename;

 //get和set方法省略

}

public class City {
 
 //市ID
 private Long cityid;
 
 //市名称
 private String cityname;
 
 。。。 。。。

 //get和set方法省略
}

在同一位置创建映射文件
Province.hbm.xml
<hibernate-mapping>
 <class name="cn.com.pumkinchina.mapping.Province" table="C_Province">
  <id name="provinceid">
   <generator class="native" />
  </id>
  <property name="provincename"/>
</hibernate-mapping>

City.hbm.xml
<hibernate-mapping>
 <class name="cn.com.pumkinchina.mapping.City" table="C_Province">
  <id name="cityid">
   <generator class="native" />
  </id>
  <property name="cityname"/>
</hibernate-mapping>

2.查询逻辑
在cn.com.pumkinchina.service.dwr包下建立
public class ProvinceAndCityLiandong {
 
 //获得省的列表
 public List<Province> getProvinceList() {
  
  return provinceService.getAll();
 }
 
 //根据省的id查询市的列表
 public List<City> getCityList(String provinceid) {
  
  if(provinceid == null || provinceid.trim().length()==0) {
   return cityService.getCityAll();
  }
  
  return cityService.getCityrForProvince(provinceid);
 }
 
 /**
  * IOC
  */
 private ProvinceService provinceService;
 
 private CityService cityService;

 //省略set的设置器注入方法
}

3.在config包下建立spring关于dwr服务的配置文件applicationContext-dwr.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

 <bean id="ProvinceAndCityService" class="cn.com.pumkinchina.service.dwr.ProvinceAndCityLiandong" >
  <property name="provinceService" ref="ProvinceService" />
  <property name="cityService" value="CityService" />
 </bean> 
</beans>

4.WEB-INF下建立dwr.xml
<!DOCTYPE dwr PUBLIC
    "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN"
    "http://directwebremoting.org/schema/dwr30.dtd">
<dwr>
 <allow>
  <convert converter="bean" match="cn.com.pumkinchina.mapping.Province">
   <param name="include" value="provinceid,provincename" />
  </convert>
  <convert converter="bean" match="cn.com.pumkinchina.mapping.City">
   <param name="include" value="cityid,cityname" />
  </convert>
  <create creator="spring" javascript="ProvinceAndCityScript">
   <param name="beanName" value="ProvinceAndCityService"/>
   <include method="getProvinceList"/>
   <include method="getCityList"/>
  </create>
 </allow>
</dwr>

5.jsp：test.jsp
<%@ page contentType="text/html;charset=utf-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <title>框架页面</title>
  <script type="text/javascript" src="<%=basePath%>dwr/interface/ProvinceAndCityScript.js"></script>
  <script type="text/javascript" src="<%=basePath%>dwr/engine.js"></script>
  <script type="text/javascript" src="<%=basePath%>dwr/util.js"></script>
  <script type="text/javascript" src="<%=basePath%>jquery/jquery.js"></script>  
  <script type="text/javascript">
  
  $(function(){
   dwr.engine.setAsync(false);
   getProvinceList();
   getCityList();
  });

  function getProvinceList() {
   ProvinceAndCityScript.getProvinceList({
    callback:function(provincelist){
     dwr.util.removeAllOptions("province");
     dwr.util.addOptions("province",[{name:"请选择...",value:"0" }],"value","name");
     dwr.util.addOptions("province",provincelist,"provinceid","provincename");
    },
    timeout:5000
   });
  }

  function getCityList() {
   ProvinceAndCityScript.getCityList(dwr.util.getValue("province"),{
    callback:function(citylist){
     dwr.util.removeAllOptions("city");
     dwr.util.addOptions("city",[{name:"请选择...",value:"0" }],"value","name");
     dwr.util.addOptions("city",citylist,"cityid","cityname");
    },
    timeout:5000
   });
  }

  </script>
 </head>
 <body>
 <select id="province" onchange="getCityList()"></select> 
 <select id="city"></select>
 </body>
</html>

 

 

 

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