DWR3反转引擎

DWR3反转引擎

DWR3 入门:

DWR3使用Ajax反转引擎(Reverse Ajax) 进行消息传递: 
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applicationContext.xml
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<?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:tx="http://www.springframework.org/schema/tx"
xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
  http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
  http://www.springframework.org/schema/tx
  http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
  http://www.directwebremoting.org/schema/spring-dwr     
        http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context-2.5.xsd"
default-autowire="byName" default-lazy-init="true">




<description>Spring公共配置</description>



<!-- 定义受环境影响易变的变量 -->
<bean
   class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
   <property name="systemPropertiesModeName"
    value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
   <property name="ignoreResourceNotFound" value="true" />
   <property name="locations">
    <list>
     <!-- 标准配置 -->
     <value>
      classpath*:/config/db/application.properties
     </value>

    </list>
   </property>
</bean>



<!-- 数据源配置,使用应用内的DBCP数据库连接池 -->
<bean id="dataSource"
   class="org.apache.commons.dbcp.BasicDataSource"
   destroy-method="close">
   <!-- Connection Info -->
   <property name="driverClassName" value="${jdbc.driver}" />
   <property name="url" value="${jdbc.url}" />
   <property name="username" value="${jdbc.username}" />
   <property name="password" value="${jdbc.password}" />

   <!-- Connection Pooling Info -->
   <property name="initialSize" value="5" />
   <property name="maxActive" value="100" />
   <property name="maxIdle" value="30" />
   <property name="maxWait" value="1000" />
   <property name="poolPreparedStatements" value="false" />
   <property name="defaultAutoCommit" value="false" />
</bean>


<!-- Hibernate配置 -->
<bean id="sessionFactory"
   class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
   <property name="dataSource" ref="dataSource" />
   <property name="namingStrategy">
    <bean class="org.hibernate.cfg.ImprovedNamingStrategy" />
   </property>
   <property name="hibernateProperties">
    <props>
     <prop key="hibernate.dialect">
      ${hibernate.dialect}
     </prop>
     <prop key="hibernate.show_sql">
      ${hibernate.show_sql}
     </prop>
     <prop key="hibernate.format_sql">
      ${hibernate.format_sql}
     </prop>
     <prop key="hibernate.cache.provider_class">
      org.hibernate.cache.EhCacheProvider
     </prop>
     <prop
      key="hibernate.cache.provider_configuration_file_resource_path">
      ${hibernate.ehcache_config_file}
     </prop>
    </props>
   </property>


   <property name="packagesToScan">
    <list>
     <value>com.wpms.entity.*</value>
    </list>
   </property>
</bean>

<!-- 事务管理器配置,单数据源事务 -->
<bean id="transactionManager"
   class="org.springframework.orm.hibernate3.HibernateTransactionManager">
   <property name="sessionFactory" ref="sessionFactory" />
</bean>

<!-- 使用annotation定义事务 -->
<tx:annotation-driven transaction-manager="transactionManager"
   proxy-target-class="true" />


<!-- 启用 annotation 配置模式 -->
<context:annotation-config />

<!-- 使用annotation 自动注册bean,并保证@Required,@Autowired的属性被注入 -->
<context:component-scan base-package="com.wpms.user.*" />



<!-- DWR 配置 BEGIN -->

<!-- 启动 DWR 注解配置模式 -->
<dwr:configuration />
<dwr:annotation-config />
<dwr:url-mapping />
<!-- 开启dubug状态 -->
<dwr:controller debug="true" />
<!-- DWR 配置 END-->


</beans>
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web.xml
--------------------------------
<?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">


<!-- spring config url start-->
<context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>
    classpath*:config/dwr3/applicationContext.xml
   </param-value>
</context-param>
<!-- spring config url end-->

<!-- 著名的 Character Encoding filter -->
<filter>
   <filter-name>encodingFilter</filter-name>
   <filter-class>
    org.springframework.web.filter.CharacterEncodingFilter
   </filter-class>
   <init-param>
    <param-name>encoding</param-name>
    <param-value>UTF-8</param-value>
   </init-param>
</filter>
<!--Hibernate Open Session in View Filter-->
<!-- 假设在你的应用中Hibernate是通过spring 来管理它的session.如果在你的应用中没有使用OpenSessionInViewFilter
   或者OpenSessionInViewInterceptor。session会在transaction结束后关闭，此时会抛出session is close 的异常-->
<filter>
   <filter-name>hibernateFilter</filter-name>
   <filter-class>
    org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
   </filter-class>
</filter>

<!-- struts2 start-->
<filter>
   <filter-name>struts2</filter-name>
   <filter-class>
    org.apache.struts2.dispatcher.FilterDispatcher
   </filter-class>
</filter>

<filter-mapping>
   <filter-name>struts2</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>
<!-- struts2 end -->

<!-- 过滤器映射 -->

<filter-mapping>
   <filter-name>encodingFilter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
   <filter-name>hibernateFilter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>


<!-- dwr配置 -->
<servlet>
   <servlet-name>dwr</servlet-name>
   <servlet-class>
    org.directwebremoting.spring.DwrSpringServlet
   </servlet-class>

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


   <init-param>
    <param-name>debug</param-name>
    <param-value>true</param-value>
   </init-param>
</servlet>
<servlet-mapping>
   <servlet-name>dwr</servlet-name>
   <url-pattern>/dwr/*</url-pattern>
</servlet-mapping>

<!--Spring ApplicationContext 载入    -->
<listener>
   <listener-class>
    org.springframework.web.context.ContextLoaderListener
   </listener-class>
</listener>

<!-- 扩展spring bean的作用域有request,session,global session等-->
<listener>
   <listener-class>
    org.springframework.web.context.request.RequestContextListener
   </listener-class>
</listener>

<!-- Spring 刷新Introspector防止内存泄露 -->
<listener>
   <listener-class>
    org.springframework.web.util.IntrospectorCleanupListener
   </listener-class>
</listener>

<!-- 开始页面 -->
<welcome-file-list>
   <welcome-file>index.html</welcome-file>
</welcome-file-list>

<error-page>
   <error-code>404</error-code>
   <location>/pagenotfound.jsp</location>
</error-page>
<error-page>
   <exception-type>java.lang.Exception</exception-type>
   <location>/error.jsp</location>
</error-page>


</web-app>


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HTML source:

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<script type='text/javascript'
src='${pageContext.request.contextPath}/dwr/interface/putpageinfo.js'></script>
<script type='text/javascript'
src='${pageContext.request.contextPath}/dwr/engine.js'></script>
<script type='text/javascript'
src='${pageContext.request.contextPath}/dwr/util.js'></script>


<script type='text/javascript'>

function putstart(){

alert("begin");   
putpageinfo.begin();
}

function reverseFunction(data){   
document.all.backtext.value=data;   
}

</script>
<html>
<head>
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   <title>JSP Page</title>
</head>
<body onload="dwr.engine.setActiveReverseAjax(true);">
   <input id="submit" type="submit" value="begin" onclick="putstart()" />
   <input type="text" id="backtext" name="backtext" value="" />
</body>
</html>


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Javascript source:

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Java source:
package com.wpms.user.action.dwr;

import org.directwebremoting.Browser;
import org.directwebremoting.ScriptSessions;
import org.directwebremoting.WebContext;
import org.directwebremoting.WebContextFactory;
import org.directwebremoting.annotations.RemoteMethod;
import org.directwebremoting.annotations.RemoteProxy;
import org.springframework.stereotype.Controller;

@Controller
@RemoteProxy(name = "putpageinfo")
public class PutSomethingToPage extends Thread {
private static WebContext wctx = null;

@RemoteMethod
public void begin() {
   if (wctx == null) {
    wctx = WebContextFactory.get();
   }

   System.out.println("put begin!");

   String page = wctx.getCurrentPage();
   Browser.withPage(page, new Runnable() {
    public void run() {
     ScriptSessions.addScript("reverseFunction(12)");
    }
   });

}

}