初学DWR框架时运行结果不正确

我按照书上的例子用DWR写了一个helloWord 测试程序
当打开页面时点击Button按钮就应该alert出来一个helloword
但是显示的确是 “/DwrDemo/dwr${plainCallHandlerUrl}service.sayHello.dwr”这样一串字符
其中 DwrDemo 是我的工程名， service是我在dwr配置文件里面指定的JS函数名称，sayHello是我在后台的函数名称
但是他显示这窜字符是什么意思呢

解决方案 »

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web.xml的内容
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<listener>
<filter-class>org.directwebremoting.servlet.DwrListener</filter-class>
</listener>
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>
dwr.xml 的内容
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN"
"http://getahead.org/dwr/dwr30.dtd">
<dwr>
<allow>
<create creator="new" javascript="service">
<param name="class" value="helloword.Service"/>
</create>
</allow>
</dwr>
Service 类的内容package helloword;
public class Service {
public String sayHello(String name)
{
return "Hello:"+name;
}
}
页面内容<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%
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>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

<script type='text/javascript' src='dwr/interface/service.js'></script><script type='text/javascript' src='JS/engine.js'></script>
<script type='text/javascript' src='JS/util.js'></script>
<script type="text/javascript">
  function firstDwr(){
   service.sayHello("地球人",callback);
  }
  function callback(data){
   alert(data);
  }
</script>
  </head>

  <body>
    This is my JSP page. <br>
<input type="button" name="button" value="鼠标移过来." onclick="firstDwr()"/>
  </body>
</html>
<script type='text/javascript' src='dwr/interface/service.js'></script>
<script type='text/javascript' src='JS/engine.js'></script>
<script type='text/javascript' src='JS/util.js'></script> 这有问题吧<script type='text/javascript' src='<%=path%>/dwr/interface/service.js'></script>
<script type='text/javascript' src='<%=path%>/dwr/engine.js'></script>
<script type='text/javascript' src='<%=path%>/dwr/util.js'></script>
但是我是新建的一个名为JS的文件夹里面放的是engine.js，util.js这2个.JS文件
<script type='text/javascript' src='<%=path%>/dwr/engine.js'></script>
<script type='text/javascript' src='<%=path%>/dwr/util.js'></script>
这是DWR自带的JS不是要你去建的
你先这样访问 /DwrDemo/dwr 然后就出来你配置的dwr你点就去，那3个js的路劲给你生成好了，你再拷贝到jsp里面就不会错了
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping> <script type='text/javascript' src='${pageContext.request.contextPath}/dwr/util.js'></script>
<script type='text/javascript' src='${pageContext.request.contextPath}/dwr/engine.js'></script>
<script type='text/javascript' src='${pageContext.request.contextPath}/dwr/interface/XXXX.js'></script>

初学DWR框架时 运行结果不正确

解决方案 »

初学DWR框架时运行结果不正确