前些日子看了一篇关于在Spring 2中整合DWR 2的文章《AJAX, DWR and Spring》。最近,想动手试一下,就下载其源代码回来看看,依葫芦画瓢做了一遍。在运行时,得到XML验证错误。经过一翻折腾,终于把问题解决。
Spring 2基于XML Schema的配置众所周知,Spring 2通过XML Schema配置方式极大地简化的其配置,而且使得第三方扩展变为可能。配置如下代码所示: <? xml version="1.0" encoding="UTF-8" ?>
清单1 applicationContext.xml
< beans xmlns ="http://www./schema/beans" xmlns:xsi ="http://www./2001/XMLSchema-instance" xsi:schemaLocation ="http://www./schema/beans http://www./schema/beans/spring-beans-2.0.xsd" > <!-- <bean /> definitions here --> </ beans > 不知大家有没有想过spring-beans-2.0.xsd位置在那里?其实,大家可以用Eclipse打开Spring的jar包,展开META-INF,并双击打开其中的spring.schemas文件,内容如下: http\://www./schema/beans/spring-beans- 2.0 .xsd = org/springframework/beans/factory/xml/spring-beans- 2.0 .xsd
清单2 spring.schemas
http\://www./schema/tool/spring-tool- 2.0 .xsd = org/springframework/beans/factory/xml/spring-tool- 2.0 .xsd http\://www./schema/util/spring-util- 2.0 .xsd = org/springframework/beans/factory/xml/spring-util- 2.0 .xsd http\://www./schema/aop/spring-aop- 2.0 .xsd = org/springframework/aop/config/spring-aop- 2.0 .xsd http\://www./schema/lang/spring-lang- 2.0 .xsd = org/springframework/scripting/config/spring-lang- 2.0 .xsd http\://www./schema/tx/spring-tx- 2.0 .xsd = org/springframework/transaction/config/spring-tx- 2.0 .xsd http\://www./schema/jee/spring-jee- 2.0 .xsd = org/springframework/ejb/config/spring-jee- 2.0 .xsd http\://www./schema/beans/spring-beans.xsd = org/springframework/beans/factory/xml/spring-beans- 2.0 .xsd http\://www./schema/tool/spring-tool.xsd = org/springframework/beans/factory/xml/spring-tool- 2.0 .xsd http\://www./schema/util/spring-util.xsd = org/springframework/beans/factory/xml/spring-util- 2.0 .xsd http\://www./schema/aop/spring-aop.xsd = org/springframework/aop/config/spring-aop- 2.0 .xsd http\://www./schema/lang/spring-lang.xsd = org/springframework/scripting/config/spring-lang- 2.0 .xsd http\://www./schema/tx/spring-tx.xsd = org/springframework/transaction/config/spring-tx- 2.0 .xsd http\://www./schema/jee/spring-jee.xsd = org/springframework/ejb/config/spring-jee- 2.0 .xsd 从以上的文件中,可以看出XML Sechema文件在类包中位置。 DWR 2.0 RC 2中的XML Schema文件根据上面的描述,我打开DWR的jar包中spring.schemas文件,内容如下: http\://www./schema/spring-dwr- 2.0 .xsd = org/directwebremoting/spring/spring-dwr- 2.0 .xsd
然后,按照上面的路径打开spring-dwr-2.0.xsd文件,内容如下: <? xml version="1.0" encoding="UTF-8" standalone="no" ?>
清单3 spring-dwr-2.0.xsd
<!-- 省略了版权信息 --> < xsd:schema xmlns ="http://www./schema/spring-dwr" xmlns:xsd ="http://www./2001/XMLSchema" targetNamespace ="http://www./schema/spring-dwr" elementFormDefault ="qualified" attributeFormDefault ="unqualified" > <!-- 省略了具体的定义 --> </ xsd:schema > 文件spring-dwr-2.0.xsd告诉我们,其名称空间应为“http://www./schema/spring-dwr”,所以我们在配置Spring 2时,应使用以上的名称空间,如下面的代码片段所示: <? xml version="1.0" encoding="UTF-8" ?>
清单3 ajaxContext.xml
< beans xmlns ="http://www./schema/beans" xmlns:dwr ="http://www./schema/spring-dwr" xmlns:xsi ="http://www./2001/XMLSchema-instance" xsi:schemaLocation ="http://www./schema/beans http://www./schema/beans/spring-beans.xsd http://www./schema/spring-dwr http://www./schema/spring-dwr-2.0.xsd" > < dwr:configuration > < dwr:convert class ="net.blogjava.max.pws.domain.Album" type ="bean" > < dwr:exclude method ="photos" /> </ dwr:convert > < dwr:convert class ="net.blogjava.max.pws.domain.Photo" type ="bean" > < dwr:exclude method ="original, poster, thumb, full, album" /> </ dwr:convert > </ dwr:configuration > < bean id ="ajaxFacade" class ="net.blogjava.max.pws.web.ajax.AjaxFacade" > < dwr:remote javascript ="AjaxFacade" /> < property name ="personalWebSite" ref ="personalWebSite" /> </ bean > </ beans > WEB-INF/web.xml配置通过上面的配置,我们可以省去dwr.xml配置,不过在web.xml配置dwr的Servlet时,要使用新的Servlet类。配置代码片段如下: < servlet >
清单4 web.xml
< servlet-name > dwr </ servlet-name > < servlet-class > org.directwebremoting.spring.DwrSpringServlet </ servlet-class > < init-param > < param-name > debug </ param-name > < param-value > true </ param-value > </ init-param > < load-on-startup > 1 </ load-on-startup > </ servlet > < servlet-mapping > < servlet-name > dwr </ servlet-name > < url-pattern > /dwr/* </ url-pattern > </ servlet-mapping > 总结通过在Spring 2整合DWR 2配置,可以集中管理应用程序的配置,从一定程度上解决JavaEE开发中的配置文件泛滥的问题。 |
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