struts2+spring+hibernate+dwr3实现下拉框二级联动
来源：程序员人生 发布时间：2015-01-09 09:01:10 阅读次数：2457次
3大框架如何整合我这就不说了，csdn里很多大神都有详细整合博客。
由于是用spring管理了struts2和hibernate，所以我们只要把spring与dwr整合就好了。
首先我们需要dwr.jar我用的是最新的dwr3，之前测试过dwr2也是成功的。
先把我们的dwr.jar放到工程的lib目录下，再在web.xml的同等级目录下新建1个dwr.xml。
这是我的dwr.xml配置
<?xml version="1.0" encoding="UTF⑻"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd">
<dwr>
<allow>
<!-- List到页面上，就是数组。Map到页面上，就这样去rtu["字段名称"]，如过从
数据库中查询到的，记得字段名称大写 -->
<convert converter="array" match="*"/>
<convert converter="array" match="[[*"/>
<convert converter="collection" match="java.util.Collection"/>
<!-- 传统的DWR -->
<create javascript="CourseAction" creator="spring">
<param name="beanName" value="courseAction" />
</create>
//你所需要用到的javabean
<convert converter="bean" match="com.jxust.bean.Chapter"> </convert>
<convert converter="bean" match="com.jxust.bean.Course"> </convert>
<convert converter="bean" match="com.jxust.service.serviceImpl.VideoServiceImpl"> </convert>
</allow>
<signatures>
<![CDATA[
import java.util.Map ;
import java.util.List ;
]]>
</signatures>
</dwr>
接着再在web.xml里面加入这段代码
<!-- dwr配置 -->
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>
org.directwebremoting.servlet.DwrServlet
</servlet-class>
<init-param>
<param-name>config-dwr</param-name>
<param-value>/WEB-INF/dwr.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>activeReverseAjaxEnabled</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>
initApplicationScopeCreatorsAtStartup
</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>maxWaitAfterWrite</param-name>
<param-value>500</param-value>
</init-param>
<init-param>
<param-name>allowGetForSafariButMakeForgeryEasier</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>crossDomainSessionSecurity</param-name>
<param-value>false</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
这是用来配置dwr的。
接着在你所要引入的dwr的页面上引入/dwr/util.js、/dwr/engine.js、和你要操作的java方法我这里用的是引入了action里面的方法/dwr/interface/CourseAction.js
<script type='text/javascript'src="<s:url value='/dwr/util.js'/>"></script>
<script type='text/javascript' src="<s:url value='/dwr/engine.js'/>"></script>
<script type='text/javascript' src="<s:url value='/dwr/interface/CourseAction.js'/>"></script>
我测试过好像dwr的两个工具类不可以放在引入action方法后面，如有毛病请大神改正。
下面是我的页面完全代码
<%@ page language="java" import="java.util.*" pageEncoding="UTF⑻"%>
<%@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>
<base href="<%=basePath%>">
<title>videoUpload</title>
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type='text/javascript'src="<s:url value='/dwr/util.js'/>"></script>
<script type='text/javascript' src="<s:url value='/dwr/engine.js'/>"></script>
<script type='text/javascript' src="<s:url value='/dwr/interface/CourseAction.js'/>"></script>
<script>
function getList(){
var course=document.getElementById("course_title").value;
CourseAction.getChapterList(course,getChapter_callback)
}
function getChapter_callback(data){
alert(data);
var chapter=document.getElementById("course_chapter");
chapter.options.length=0;
for(var i=0;i<data.length;i++)
{
var opt=document.createElement("option")
opt.value=data[i].title;
opt.innerText=data[i].title;
//var opt=new option(data[i].title,data[i]);
chapter.appendChild(opt);
}
}
</script>
</head>
<body>
<s:form name="videoForm" id="videoForm" action="courseAction_addVideo" method="post">
<table width="100%" border="0" cellpadding="1" cellspacing="1">
<tr bgcolor="#ccccff" >
<td colspan="2" align="center"><strong>添加视频</strong></td>
</tr>
<tr bgcolor="#ccccff" >
<td width="18%">选择课程</td>
<td width="82%"><s:select onchange="getList();" name="course.name" id="course_title" list="#CourseList"
headerKey="0" headerValue="-请选择课程-" listKey="name" listValue="name" /></td>
</tr>
<tr bgcolor="#ccccff" >
<td>选择章节名称：</td>
<td><s:select name="chapter.title" id="course_chapter" list="#{}"
listKey="title" /></td>
</tr>
<tr bgcolor="#ccccff" >
<td>确认添加</td>
<td><input type="button" id="button" value="确认添加"/></td>
</tr>
</table>
</s:form>
</body>
</html>
索性把java代码也贴出来
//dwr2级联动
public Set<Chapter> getChapterList(String name)throws Exception{
System.out.println("asdfasd");
Course course=courseService.findBytitle(name);
getChapterList=course.getCourseChapter();
return getChapterList;
}
List 的getter、setter方法省略
生活不易，码农辛苦
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