DWR框架集成到J2EE中

一、J2EE项目不用任何其他框架集成DWR框架：

web.xml配置文件：

<servlet><servlet-name>dwr</servlet-name><servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class><init-param><param-name>debug</param-name><param-value>true</param-value></init-param><!-- 配置DWR.XML方法一 --><init-param><param-name>config</param-name><param-value>WEB-INF/classes/dwr.xml</param-value></init-param><!-- 如果不配置这个容易出现dwr Error: java.lang.SecurityException, Session Error异常 --><init-param><param-name>crossDomainSessionSecurity</param-name><param-value>false</param-value></init-param></servlet><servlet-mapping><servlet-name>dwr</servlet-name><url-pattern>/dwr/*</url-pattern></servlet-mapping>

WEB-INF/classes/dwr.xml的配置文件：

<?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>  <!-- <convert converter="bean" match=""/> -->   <create creator="new" javascript="Hello" scope="page">    <param name="class" value="luff.dwr.TESTDwr" />    <include method="test"/>   </create>  </allow> </dwr>

luff.dwr.TESTDwr类的编写内容：

package luff.dwr;public class TESTDwr {public String test(){return "123456";}}

jsp页面调用的方法：

<script type="text/javascript" src="dwr/interface/Hello.js"></script><script type="text/javascript" src="dwr/engine.js"></script><script type="text/javascript" src="dwr/util.js"></script><script type="text/javascript">function ad(){Hello.test(function(data){alert(data);});}</script>

其中maven依赖为：

<dependency>    <groupId>org.directwebremoting</groupId>    <artifactId>dwr</artifactId>    <version>2.0.10</version></dependency><!-- 如果不包含这个依赖包会出现：DWR Could not initialize class org.directwebremoting.servlet.PlainPollHandler异常 --><dependency><groupId>commons-logging</groupId><artifactId>commons-logging</artifactId><version>1.2</version></dependency>

需要的jar包：commons-logging-1.2.jar、dwr-2.0.10.jar

二、J2EE项目集成spring与DWR框架：

web.xml配置内容：

<!-- 配置spring --><context-param>        <param-name>contextConfigLocation</param-name>        <param-value>WEB-INF/classes/app*.xml</param-value>    </context-param>    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener><servlet><servlet-name>dwr</servlet-name><!--这里如果还是org.directwebremoting.servlet.DwrServlet则会出现如下异常Error: java.lang.SecurityException: No class by name: TESTDwr --><servlet-class>org.directwebremoting.spring.DwrSpringServlet</servlet-class><init-param><param-name>debug</param-name><param-value>true</param-value></init-param><!-- 如果不配置这个容易出现dwr Error: java.lang.SecurityException, Session Error异常 --><init-param><param-name>crossDomainSessionSecurity</param-name><param-value>false</param-value></init-param></servlet><servlet-mapping><servlet-name>dwr</servlet-name><url-pattern>/dwr/*</url-pattern></servlet-mapping>

其中WEB-INF/classes/app*.xml的配置文件内容：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"xmlns:p="http://www.springframework.org/schema/p"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.directwebremoting.org/schema/spring-dwrhttp://www.directwebremoting.org/schema/spring-dwr-2.0.xsd"default-autowire="byName"><bean id="tESTDwr" class="luff.dwr.TESTDwr"><dwr:remote javascript="Hello"><!-- 异步方法方法 --><dwr:include method="qixi" /><!-- <dwr:convert class="" type="bean" /> --></dwr:remote></bean></beans>

luff.dwr.TESTDwr类内容的编写：

package luff.dwr;public class TESTDwr {public String test(){return "123456";}public String qixi(String name){return "欢迎你：" + name;}}

jsp页面调用方法：

<script type="text/javascript" src="dwr/interface/Hello.js"></script><script type="text/javascript" src="dwr/engine.js"></script><script type="text/javascript" src="dwr/util.js"></script><script type="text/javascript">function ad(){Hello.qixi("八年", function(data){alert(data);});}</script>

其中maven依赖为：

<dependency><groupId>org.directwebremoting</groupId><artifactId>dwr</artifactId><version>3.0.M1</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>3.2.10.RELEASE</version></dependency>

注意，千万不要依赖spring版本为4.x的，spring4.x的部分类重构之后会报方法找不到异常。

需要的jar包：

参考文献：

1、http://www.cnblogs.com/kunpengit/archive/2012/03/09/2387537.html   J2EE单独配置DWR

2、http://niwenhui.blog.163.com/blog/static/17060361520108822011653/   J2EE单独配置DWR，多个方法名配置到一个include里面用‘，’分隔。

3、http://blog.csdn.net/qq635785620/article/details/8169012   解决：DWR Could not initialize classorg.directwebremoting.servlet.PlainPollHandler异常

4、http://blog.csdn.net/qq635785620/article/details/8169012 解决：Error: java.lang.SecurityException, Session Error异常

5、http://www.cnblogs.com/linjiqin/archive/2011/03/28/1998125.html   J2EE配置spring、dwr框架

6、http://blog.sina.com.cn/s/blog_6792eed00100ijh9.html

7、http://blog.sina.com.cn/s/blog_5f044a4d010185pn.html  解决：Error: java.lang.SecurityException, Session Error  异常