AJAX整合－DWR 2.0 Work in Spring 1.2.x筆記

3 12 月, 2006 · No Comments

DWR 2.0 Work in Spring 1.2.x筆記
這幾天在玩AJAX，主要是將DWR2.0整合到Spring 1.2.x版
主要設定方式如下，設定檔部份也有1.3版的注解，已方便使用1.3版時，可用。

1.在dwr.xml撰寫內容如下

<dwr>

<allow>

<create creator="spring" javascript="Verify" scope="application">

<!-- ver 1.3 

<param name="class" value="tw.edu.nccu.ajax.Verify"/>

-->

<!-- ver 2.0 -->

<param name="beanName" value="verify" />

</create>

<convert converter="bean" match="tw.edu.nccu.ajax.Verify" />

</allow>

</dwr>

ver 1.3 DOCTYPE is <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd">

ver 2.0 DOCTYPE is <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr//dwr20.dtd">

2.在web.xml撰寫內容如下，db-config.xml是DB設定檔。因為使用ContextLoaderListener，所以欲設讀取Context檔案為dispatcherServlet-servlet.xml

 <context-param>

  <param-name>contextConfigLocation</param-name>

  <param-value>/WEB-INF/db-config.xml</param-value>

  </context-param>
 <listener>

  <listener-class>

  org.springframework.web.context.ContextLoaderListener

  </listener-class>

  </listener>
 <servlet>

  <servlet-name>dispatcherServlet</servlet-name>

  <servlet-class>

  org.springframework.web.servlet.DispatcherServlet

  </servlet-class>

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

  </servlet>
 <servlet-mapping>

  <servlet-name>dispatcherServlet</servlet-name>

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

  </servlet-mapping>

3.在dispatcherServlet-servlet.xml寫內容如下

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

  <!DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN" "http://www.springframework.org/dtd/spring-beans.dtd">

  <beans>

  <bean id="urlMapping"

  class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">

  <property name="mappings">

  <props> 

  <prop key="/**/*">dwrController</prop> 

  </props>

  </property>

  </bean>
 <bean id="dwrController" class= "tw.edu.nccu.ajax.DWRWrapper">

  <property name="servletClass">

  <!-- 

  ver 1.3 

  <value>uk.ltd.getahead.dwr.DWRServlet</value>

  -->

  <!-- ver 2.0 -->

  <value>org.directwebremoting.servlet.DwrServlet</value>

  </property>

  <property name="initParameters">

  <props>

  <prop key="debug">true</prop>

  </props> 

  </property> 

  </bean> 

  </beans>

4.撰寫DWRWrapper程式，內容如下。此程式為解決出現DWR can’t find a spring config的問題

import org.directwebremoting.spring.SpringCreator;

import org.springframework.web.servlet.mvc.ServletWrappingController;

/**

* 

* @title DWRWrapper.java

* @package tw.edu.nccu.ajax

* @description 解決DWR working in sprig 出現 DWR can't find a spring config. 所需要的Controller

* @author Kazuya

* @date 2006/12/1

*/

public class DWRWrapper extends ServletWrappingController {

public void afterPropertiesSet() throws Exception {

SpringCreator.setOverrideBeanFactory(this.getWebApplicationContext());

super.afterPropertiesSet();

}

}

P.S.目前啟動後會出現DefaultContainer can’t find a classes的問題，但是AJAX可以運作。查詢到的結果是說原因DWR2.0加入了JDK5的註釋(annotations)。而DwrServlet初始化的時候會去檢查註釋的類別。
在官方網站也找不到解決方案，應該要等下一版本才有解決方式。

參考網站:
Your first cup of DWR : http://bram.jteam.nl/?p=2
java.net : https://dwr.dev.java.net/servlets/ReadMsg?list=users&msgNo=1167
Spring and DWR revisited : http://www.oreillynet.com/onjava/blog/2005/12/spring_and_dwr_revisited.html

Tags: 技術通報

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