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/beans
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.0.xsd
		http://www.directwebremoting.org/schema/spring-dwr
		http://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://www.jb51.cc/article/p-xejlikgn-bgy.html 解决：DWR Could not initialize classorg.directwebremoting.servlet.PlainPollHandler异常

4、http://www.jb51.cc/article/p-xejlikgn-bgy.html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