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一个简单的dwr小程序

2007-11-07 14:57 274 查看


1. web.xml和dwr.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd">
<dwr>
<allow>
<create creator="new" javascript="Hello">
<param name="class" value="com.yuqiang.Hello" />
</create>
</allow>
</dwr>

<?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">
<display-name>ajaxDWR</display-name>
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
<init-param>
<description></description>
<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>
</web-app>

2.Hello.java

package com.yuqiang;

public class Hello {
public String hello(String name){
return "您好!"+name+",开始你的DWR学习啦!";
}
}

3.hello.js

function hello() {
var user = $("usertext").value;
Hello.hello(user, callback);
}
function callback(msg) {
DWRUtil.setValue("result", msg);
}

4.index.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>index.html</title>
<script type='text/javascript' src='dwr/interface/Hello.js'></script>
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>(这个是其中的配置文件)
<script type='text/javascript' src='js/hello.js'></script>（引用写的js文件以及它的相对路径）
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">

<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

</head>

<body>
<input id="usertext" type="text" />
<input type='button' value='确定' onclick='hello();' />
<div id="result"></div>
</body>
</html>

其实这个文件和jsp一起运用的比较的多，所以配置文件下的相对路径最好前面加上如下的语句就可以的啊

<%
String path = request.getContextPath();
%>

<script type='text/javascript' src='<%=path%>/dwr/interface/Hello.js'></script>
<script type='text/javascript' src='<%=path%>/dwr/engine.js'></script>
<script type='text/javascript' src='<%=path%>/dwr/util.js'></script>
<script type='text/javascript' rc='<%=path%>/js/hello.js'></script>
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