按照文档的说明,自己写了一个简单的demo(简直就是照抄,嘿嘿),但是,就这样也会出毛病,我真晕啊!
第一步:引入:dwr.jar
第二步:在dwr-2.0.3-src\web\WEB-INF\classes\org\directwebremoting目录下找到engine.js和util.js,并引入
第三步:在web.xml中注册servlet如下:
1 <servlet>
2 <servlet-name>dwr-invoker</servlet-name>
3 <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
4 <init-param>
5 <param-name>debug</param-name>
6 <param-value>true</param-value>
7 </init-param>
12 </servlet>
13
14 <servlet-mapping>
15 <servlet-name>dwr-invoker</servlet-name>
16 <url-pattern>/dwr/*</url-pattern>
17 </servlet-mapping>
第四步:在WEB-INFO下建立dwr.xml,内容如下:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd">
<dwr>
<allow>
<create creator="new" javascript="helloWord">
<param name="class" value="on08_04_19.HelloWord" />
</create>
</allow>
</dwr>
第五步:在package:on08_04_19下编写HelloWord.java,代码如下:
package on08_04_19;
public class HelloWord {
public String sayHello(String name){
return "Hello "+name;
}
}
按照文档所说的方法测试,通过
第六步:编写JSP代码如下:
<script type="text/javascript" src="<%=request.getContextPath() %>/js/engine.js"></script>
<script type="text/javascript" src="<%=request.getContextPath() %>/js/util.js"></script>
<script type="text/javascript" src="<%=request.getContextPath() %>/dwr/interface/helloWord.js"></script>
<script type="text/javascript">
function firstDwr(){
helloWord.sayHello("杨凯",callBackMethod);
}
function callBackMethod(data){
alert(data);
}
</script>
</head>
<body>
<form action="">
<input type="button" value="欢迎" onclick="firstDwr()">
</form>
</body>
第一遍完整测试,发现点击按钮之后无反应,但是后台却打印
A request has been denied as a potential CSRF attack
无奈GOOGLE了半天,得到法子修改web.xml如下:
<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>
<init-param>
<!-- 加入了跨域调用功能 -->
<param-name>crossDomainSessionSecurity</param-name>
<param-value>false</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
然后继续测试,后台打印 Exec: helloWord.sayHello(),说明后台方法已经被调用,,但是Firefox下依然无反应,在IE下却出现JS错误:
例外被抛出且未被接住
超晕,无奈继续GOOGLE,有文章竟然说官方的JAR包有BUG,让换成他的包,我晕,真是牛人,更牛的是换成他的包之后,还真是正常了,我靠!
牛人全文:http://yahaitt.javaeye.com/blog/147795
posted on 2008-04-19 20:06
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