DWR笔记

来源：互联网发布：手机h5软件开发编辑：程序博客网时间：2024/06/05 05:20

1.创建web工程。将dwr所需要的jar包导出，基本的jar文件包括

/DWRProject/WebRoot/WEB-INF/lib/bsf-2.3.jar

/DWRProject/WebRoot/WEB-INF/lib/bsh-2.0b4.jar

/DWRProject/WebRoot/WEB-INF/lib/commons-logging-1.0.4.jar
/DWRProject/WebRoot/WEB-INF/lib/commons-validator-1.1.4.jar
/DWRProject/WebRoot/WEB-INF/lib/dwr.jar
/DWRProject/WebRoot/WEB-INF/lib/jakarta-oro-2.0.8.jar

/DWRProject/WebRoot/WEB-INF/lib/log4j-1.2.12.jar

2.配置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>
      <param-name>activeReverseAjaxEnabled</param-name>
      <param-value>true</param-value>
    </init-param>

    
    <init-param>
      <param-name>initApplicationScopeCreatorsAtStartup</param-name>
      <param-value>true</param-value>
    </init-param>

    
    <init-param>
      <param-name>maxWaitAfterWrite</param-name>
      <param-value>-1</param-value>
    </init-param>

    

    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>dwr-invoker</servlet-name>
    <url-pattern>/dwr/*</url-pattern>
</servlet-mapping>

3.配置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="Demo">
      <param name="class" value="org.getahead.dwrdemo.simpletext.Demo"/>
    </create>
</allow>
</dwr>

4.jsp 页面

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
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 'index.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">
       
   <script type='text/javascript' src='dwr/engine.js'> </script>
<script type='text/javascript' src='dwr/util.js'> </script>
<script type='text/javascript' src='dwr/interface/Demo.js'> </script>
       <script type='text/javascript'>
       function update() {
        var name = dwr.util.getValue("demoName");
           Demo.sayHello(name, function(data) {
           dwr.util.setValue("demoReply", data);
               });
       }
   </script>
   </head>

   <body>
       <p>
           Name:
           <input type="text" id="demoName" />
           <input value="Send" type="button" onclick="update()" />
           <br />
           Reply:
           <span id="demoReply"></span>
       </p>
   </body>
</html>
注意：script的路径问题。