发表时间：2008-11-27
最后修改：2009-11-04
欢迎访问: www.ptcms.cn
相关配置和文档 如下:
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd">
<dwr>
<allow>
<!-- Loading demo -->
<create javascript="Loading" creator="new">
<param name="class" value="cn.lh.dwr.Loading" />
</create>
</allow>
</dwr>
---------------------------------
<%@ 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 'loading.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">
<!--引入dwr的js脚本-->
<script src="dwr/interface/Loading.js"></script>
<script src="dwr/engine.js" /></script>
<script src="dwr/util.js" /></script>
<script type="text/javascript">
function getuserinfor(){
//显示loading界面：
useLoadingMessage("正在与后台处理，请秒候. . .")
var textinfor = dwr.util.getValue("text_id");
Loading.getUser(textinfor,callback);
}
function callback(data){
dwr.util.setValue(result,data);
}
/**loading*/
var useLoadingMessage = function(message) {
var loadingMessage;
if (message) loadingMessage = message;
else loadingMessage = "Loading";
dwr.engine.setPreHook(function() {
var disabledZone = dwr.util.byId('disabledZone');
if (!disabledZone) {
disabledZone = document.createElement('div');
disabledZone.setAttribute('id', 'disabledZone');
disabledZone.style.position = "absolute";
disabledZone.style.zIndex = "1000";
disabledZone.style.left = "-400px";
disabledZone.style.top = "0px";
disabledZone.style.width = "100%";
disabledZone.style.height = "100%";
document.body.appendChild(disabledZone);
var messageZone = document.createElement('div');
messageZone.setAttribute('id', 'messageZone');
messageZone.style.position = "absolute";
messageZone.style.top = "0px";
messageZone.style.right = "0px";
messageZone.style.background = "blue";
messageZone.style.color = "red";
messageZone.style.fontFamily = "Arial,Helvetica,sans-serif";
messageZone.style.padding = "4px";
disabledZone.appendChild(messageZone);
var text = document.createTextNode(loadingMessage);
messageZone.appendChild(text);
dwr.util._disabledZoneUseCount = 1;
}
else {
dwr.util.byId('messageZone').innerHTML = loadingMessage;
disabledZone.style.visibility = 'visible';
dwr.util._disabledZoneUseCount++;
}
});
dwr.engine.setPostHook(function() {
dwr.util._disabledZoneUseCount--;
if (dwr.util._disabledZoneUseCount == 0) {
dwr.util.byId('disabledZone').style.visibility = 'hidden';
}
});
}
</script>
</head>
<body>
你的用户名:<br/>
<input type="text" id="text_id" onchange="getuserinfor();"/>
返回的结果:
<span id="result"></span>
</body>
</html>
--------------------------------
package cn.lh.dwr;
public class Loading {
public String getUser(String user){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "hello "+user+"当前服务器时间:"+System.currentTimeMillis() ;
}
}
----------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<!-- dwr -->
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<!-- This should NEVER be present in live -->
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
<!-- Remove this unless you want to use active reverse ajax -->
<init-param>
<param-name>activeReverseAjaxEnabled</param-name>
<param-value>true</param-value>
</init-param>
<!-- By default DWR creates application scope objects when they are first
used. This creates them when the app-server is started -->
<init-param>
<param-name>initApplicationScopeCreatorsAtStartup</param-name>
<param-value>true</param-value>
</init-param>
<!-- This enables full streaming mode. It's probably better to leave this
out if you are running across the internet -->
<init-param>
<param-name>maxWaitAfterWrite</param-name>
<param-value>-1</param-value>
</init-param>
<!--
For more information on these parameters, see:
- http://getahead.org/dwr/server/servlet
- http://getahead.org/dwr/reverse-ajax/configuration
-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<!-- /dwr -->
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
