[英]DWR example is not working
I copied the example from a website and it is not working, can anyone tell me what is the reason. 我从网站复制了该示例,但该示例无法正常工作,任何人都可以告诉我原因是什么。 I am not getting any exceptions or errors in the console log of tomcat. 我在tomcat的控制台日志中没有任何异常或错误。
below are my files dwrtest.jsp 以下是我的文件dwrtest.jsp
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>DIRECT WEB REMOTING (DWR) TEST APPLICATION</title>
<base href="${pageContext.request.contextPath}">
<!-- You have to include these two JavaScript files from DWR -->
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>
<!-- This JavaScript file is generated specifically for your application -->
<script type='text/javascript' src='dwr/interface/Calculator.js'></script>
<script type='text/javascript'>
function dwrAjaxRequest() {
var num1 = DWRUtil.getValue("num1");
var num2 = DWRUtil.getValue("num2");
Calculator.addNumbers(num1,num2,dwrAjaxResponse);
}
function dwrAjaxResponse(result) {
DWRUtil.setValue("resultText",result);
}
</script>
</head>
<body>
<h2>DWR SAMPLE APPLICATION</h2>
<b>Number 1 : </b><input type="text" value="5" name="num1"/><br>
<b>Number 2 : </b><input type="text" value="6" name="num2"/><br>
<b>Result : </b><input type="text" value="" name="resultText"/><br>
<input type="button" value="Add" name="go" onClick="dwrAjaxRequest();"/>
</body>
</html>
Below is the dwr.xml file copied in WEB-INF folder 下面是复制到WEB-INF文件夹中的dwr.xml文件
<?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>
<create creator="new" javascript="Calculator">
<param name="class" value="com.example.dwr.Calculator"/>
<include method="addNumbers"/>
</create>
</allow>
</dwr>
Below is the web.xml under WEB-INF folder 以下是WEB-INF文件夹下的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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_3_0.xsd"
version="3.0">
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>uk.ltd.getahead.dwr.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>
</web-app>
Below is my Calculator.java class which is in package structure com.example.dwr 下面是我的Calculator.java类,它位于包结构com.example.dwr中
package com.example.dwr;
public class Calculator {
public int addNumbers(int a , int b) {
return (a + b);
}
}
I am new to DWR please let me know what is wrong with this example ** when i click the add button nothing happens, actually result should come in the result text box** 我是DWR的新手,请让我知道此示例的问题 **当我单击添加按钮时,什么也没有发生,实际上结果应该出现在结果文本框中**
try to expose whole class rather than a particular method,you can download a working example here 尝试公开整个类而不是特定的方法,您可以在此处下载一个有效的示例
<?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>
<create creator="new" javascript="forms">
<param name="class" value="com.stringpool.demo.Status"/>
</create>
</allow>
</dwr>
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