初学DWR,碰到的错误

zjy30015563 2012-03-31 11:54:00

我的问题是程序启动后,打开index.jsp firefox就报错

'You must include DWR engine before including this file'

if (typeof dwr == 'undefined' || dwr.engine == undefined) throw new Error('You must include DWR engine before including this file');

web.xml配置



<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" 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_2_5.xsd">

	<welcome-file-list>

		<welcome-file>index.jsp</welcome-file>

	</welcome-file-list>



	<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>

	</servlet>



	<servlet-mapping>

		<servlet-name>dwr_invoker</servlet-name>

		<url-pattern>/dwr/*</url-pattern>

	</servlet-mapping>



</web-app>

dwr.xml配置



<?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>

		<create creator="new" javascript="UserService">

			<param name="class" value="com.accp.service.UserService"></param>

			<include method="login"/>

		</create>

	</allow>

</dwr>

java代码



package com.accp.service;



public class UserService {

	public boolean login(String username,String password){

		if(username.equals("zjy") && password.equals("300")){

			return true;

		}

		return false;

	}

}

index.jsp代码



<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

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>DWR page</title>



	<script type="text/javascript" src="<%=path%>/dwr/interface/UserService.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">

		function hellodwr(){

			var username = document.getElementById("username").value;

			var password = document.getElementById("password").value;

			alert(password);

			UserService.login(username,password,hellocallback);

		}	

		

		function hellocallback(b){

			if(b){

				document.getElementById("div_login").innerHTML = "登录成功";

			}else{

				document.getElementById("div_login").innerHTML = "登录失败";

			}

		}

	</script>

	

  </head>

  

  <body>

    <div id="div_login">

    	<form action="javascript:hellodwr()" method="post">

    		用户名:<input type="text" id="username" />

    		密码:<input type="password" id="password" />

    		<input type="submit" value="提交" />

    	</form>

    </div>

  </body>

</html>

求高手解答啊,google搜半天没搜到跟这有关的错误

...全文

431 6 打赏收藏转发到动态举报

写回复

用AI写文章

6 条回复

切换为时间正序

请发表友善的回复…

发表回复

Jim肖先生 2013-12-06

打赏
举报

我也碰到这个问题了！顺序错了！

zhangle_qaz_163_com 2012-08-17

打赏
举报

整了半天，原来是这个原因。。。

a0010012255 2012-05-22

打赏
举报

[Quote=引用 2 楼的回复:]

引用 1 楼的回复:
顺序乱了，应该是：
<script type="text/javascript" src="<%=path%>/dwr/engine.js"></script>
<script type="text/javascript" src="<%=path%>/dwr/util.js"></script>
<script type="text/javascript" s……
[/Quote]

请问楼主如果不按顺序来怎么设置好像3.0以前的版本都没有顺序问题

a0010012255 2012-05-22

打赏
举报

真的是顺序问题这尼玛伤不起啊

zjy30015563 2012-03-31

打赏
举报

[Quote=引用 1 楼的回复:]
顺序乱了，应该是：
<script type="text/javascript" src="<%=path%>/dwr/engine.js"></script>
<script type="text/javascript" src="<%=path%>/dwr/util.js"></script>
<script type="text/javascript" src="<%=path%>……
[/Quote]

我晕啊,纠结了1个多小时
谢谢你

因为书上是这顺序,是书上错了,还是如果要这顺序的话,要设置其他的
<script type="text/javascript" src="<%=path%>/dwr/interface/UserService.js"></script>
<script type="text/javascript" src="<%=path%>/dwr/engine.js"></script>
<script type="text/javascript" src="<%=path%>/dwr/util.js"></script>

15年老程创业中 2012-03-31

打赏
举报

顺序乱了，应该是：
<script type="text/javascript" src="<%=path%>/dwr/engine.js"></script>
<script type="text/javascript" src="<%=path%>/dwr/util.js"></script>
<script type="text/javascript" src="<%=path%>/dwr/interface/UserService.js"></script>

ajax技术是从事WEB开发的课程，本课程是在js及jsp课程的基础上的提高课，从ajax初级开始讲解，主要...dwr插件的应用；json格式数据，jquery的深入讲解与实战训练，共22个视频教程，PPT课件及上课源代码在购买后可以下载

Dwr用了一段时间了，这会儿蛮写个简单的入门示例~ 一个小小的public写成private的错误，找了半天，郁闷~ 另外碰到的两个问题： 1.org.directwebremoting.extend.MarshallException: Error marshalling com.freeStyle.dwr.bean.User解决：配置在dwr.xml的<convert >标签...

前台dwr.jsp的脚本代码如下: $(document).ready(function(){ $("button").click(function(){ demo.findUser(dwrHandler); }); }); function dwrHandler(user){ //alert(user.id+","+user.username+",

Java hibernate中离线查询去除重复项怎么加条件？？ dc.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY); http协议及端口,smtp协议及端口 http：超文本传输协议端口 80 smtp：简单邮件传输协议端口25 编写程序，

1. hibernate中离线查询去除重复项怎么加条件？？？ dc.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY); 2. http协议及端口,smtp协议及端口 http：超文本传输协议端口 80 smtp：简单邮件传输协议端口25 3. 编写程序，完成文件复制功能 4. ...