DWR:
远程调用java代码
dwr是ajax调用应用的一种技术
使用步骤:
1.将dwr包拷到lib包中
2.配置web.xml
<listener>
<listener-class>org.directwebremoting.servlet.dwrlistener</listener-class>
</listener>
<!-- DWRServlet→来之与dwr.jar -->
<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>
<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>
3.配置dwr.xml,该文件放置到WEB-INF中
package com.dwr.demo;
public class MyDwr {
public String hello(String world) {
System.out.println("hello" + world);
return "hello" + world;
}
}
dwr.xml
<?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>
<!-- javascript的对象是Demo,create="new"是DWR自己创建类 -->
<create creator="new" javascript="MyDwr">
<!-- value是java中的类名 :将一个java类共享为一个javascript的对象-->
<param name="class" value="com.dwr.demo.MyDwr" />
</create>
</allow>
</dwr>
4.dwr.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<!-- 必要 导入js -->
<script src="<%=request.getContextPath()%>/dwr/engine.js"></script>
<!-- 如果共享的类是自己所定义的，需要使用/dwr/interface/xxx.js,这里的js名为dwr中javascript的名称 -->
<script src="<%=request.getContextPath()%>/dwr/interface/MyDwr.js"></script>
</head>
<script type="text/javascript">
function showMessage(){
//可以调用java对象的方法
MyDwr.hello("world",function(data){
alert(data)
})
}
</script>
</head>
<body onload="showMessage()">
</body>
</html>
dwr01工程:
访问dwr:效果
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时间： 2024-11-10 19:07:34