Struts2 發布已經很長時間了，一直沒有顧得上學習，本周工作比較輕松，花點時間照著例子做了一下，但是在與Spring 集成的時候出現問題，action找不到Spring中定義的bean，折騰了兩個多小時才最終搞定，決定把心得記錄下來。
Struts2 集成 Spring 的 Web.xml 最簡配置
<? xml?version="1.0"?encoding="UTF-8" ?>
< web-app? id ="WebApp_9" ?version ="2.4" ?xmlns ="http://java.sun.com/xml/ns/j2ee" ?
????xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance" ?
????xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee?http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >

???? < display-name > Struts?2.0 </ display-name >
????
???? < filter >
???????? < filter-name > struts </ filter-name > ????????
???????? < filter-class > org.apache.struts2.dispatcher.FilterDispatcher </ filter-class >
???? </ filter >
???? < filter-mapping >
???????? < filter-name > struts </ filter-name >
???????? < url-pattern > /* </ url-pattern >
???? </ filter-mapping >
????
???? < listener >
???????? < listener-class >
????????????org.springframework.web.context.ContextLoaderListener
???????? </ listener-class >
???? </ listener >
????
???? < welcome-file-list >
???????? < welcome-file > index.html </ welcome-file >
???? </ welcome-file-list >
</ web-app >

此配置適用于將Spring 的配置文件放在與Web.xml同一目錄，即WEB-INF目錄下，且配置文件采用默認命名applicationContext.xml，如果Spring配置文件沒有放在WEB-INF下或者采用了自定義名稱，則Web.xml應該如下定義：
<? xml?version="1.0"?encoding="UTF-8" ?>
< web-app? id ="WebApp_9" ?version ="2.4" ?xmlns ="http://java.sun.com/xml/ns/j2ee" ?
????xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance" ?
????xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee?http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >

???? < context-param >
???????? < param-name > contextConfigLocation </ param-name >
???????? < param-value > classpath*:applicationContext*.xml </ param-value >
???? </ context-param >
???? < filter >
???????? < filter-name > struts </ filter-name > ????????
???????? < filter-class > org.apache.struts2.dispatcher.FilterDispatcher </ filter-class >
???? </ filter >
???? < filter-mapping >
???????? < filter-name > struts </ filter-name >
???????? < url-pattern > /* </ url-pattern >
???? </ filter-mapping >
????
???? < listener >
???????? < listener-class >
????????????org.springframework.web.context.ContextLoaderListener
???????? </ listener-class >
???? </ listener >
????
???? < welcome-file-list >
???????? < welcome-file > index.html </ welcome-file >
???? </ welcome-file-list >
</ web-app >

注意這里比上個配置多出的項
???< context-param >
??????< param-name > contextConfigLocation </ param-name >
??????< param-value > classpath*:applicationContext*.xml </ param-value >
???</ context-param >

表示Spring配置文件放在CLASSPATH目錄下，即WEB-INF/classes目錄下，名稱為applicationContext*.xml，其中“*”為任意字符

注意，這還沒完，CLASSPATH下有個struts.property文件，必須在里面添加一行內容：
（我就是缺了這個導致action找不到bean）

struts.objectFactory?=?spring??

給Spring配置文件的<beans>元素加上如下屬性

<beans?default-autowire="autodetect">???

??……?……

OK,配置完畢！可以使用了