struts2 一些细微技术
1.DefaultAction,一般用在请求不存在时,默认跳转到defaultAction,例如主页
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.devMode" value="true" /> <package name="default" namespace="/" extends="struts-default"> <default-action-ref name="index"></default-action-ref> <action name="index"> <result>/default.jsp</result> </action> </package></struts>
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2.模块包含
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.devMode" value="true" /> <include file="login.xml" /></struts>
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3.通配符配置? {1}{2}指第几个*, 使用这种方法时约定要做得很好，记住一句话,约定优于配置
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.devMode" value="true" /> <package name="actions" extends="struts-default" namespace="/actions"> <action name="Student*" method="{1}"> <result>/Student{1}_success.jsp</result> </action> <action name="*_*" method="{2}"> <result>/{1}_{2}_success.jsp</result> </action> </package></struts>?
4.namespace ,下面列出了三种方式，第一种是"/one"表示访问该package下的action前面加"/one/"例: /one/index
?? 第二种:"",表示只要最后面是/xx,它就会去访问xx那个action,不过它的优先权最低,如里前面是这样的/one/index,那? 么它会去访问刚才说的第一种,如果是这样的/abc/index? 刚好没有abc这个namepackage,那么才会去访问第二种.
第三种:"/"，不用多说,只要明白它们的优先级就可以了.
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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
??? "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
??? "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
??? <constant name="struts.devMode" value="true" />
??? <package name="front" extends="struts-default" namespace="/one">
??????? <action name="index">
??????????? <result>/Namespace.jsp</result>
??????? </action>
??? </package>
???
???? <package name="main" extends="struts-default" namespace="">
??????? <action name="index">
??????????? <result>/Namespace.jsp</result>
??????? </action>
??? </package>
<package name="default" namespace="/" extends="struts-default">
???</package>
</struts>
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5.global-results 全局result,不同package访问可以使用extends
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<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.devMode" value="true" /> <package name="user" namespace="/user" extends="struts-default"> <global-results> <result name="mainpage">/main.jsp</result> </global-results> <action name="index"> <result>/index.jsp</result> </action> <action name="user" namespace="/admin" extends="user"> <action name="admin" name="code"><?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.devMode" value="true" /> <package name="user" namespace="/user" extends="struts-default"> <action name="user" name="code"><?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.devMode" value="true" /> <package name="user" namespace="/user" extends="struts-default"> <action name="user" class="com.awf.struts2.user.action.UserAction"> <result type="redirect">/user_success.jsp?t=${type}</result> </action> </package> </struts>?