利用通配符减少struts.xml中action的数量

1. 如果struts中配有如下几个action，且UserAction中有与之对应的方法

<action name="listUser" class="com.shawnqiu.action.UserAction" method="list">
	<result name="success">/listUser.jsp</result>
</action>
<action name="addUser" class="com.shawnqiu.action.UserAction" method="add">
	<result name="success">/addUser.jsp</result>
</action>
<action name="deleteUser" class="com.shawnqiu.action.UserAction" method="delete">
	<result name="success">/deleteUser.jsp</result>
</action>
<action name="updateUser" class="com.shawnqiu.action.UserAction" method="update">
	<result name="success">/updateUser.jsp</result>
</action>
<action name="findUser" class="com.shawnqiu.action.UserAction" method="find">
	<result name="success">/findUser.jsp</result>
</action>

2. 如果使用通配符，可以省略写成一个action。

<action name="*User" class="com.shawnqiu.action.UserAction" method="{1}">
	<result name="success">/{1}User.jsp</result>
</action>

其中，*为通配符，{1}为*所替换的内容，相当于

<action name="listUser" class="com.shawnqiu.action.UserAction" method="list">
	<result name="success">/listUser.jsp</result>
</action>
<action name="addUser" class="com.shawnqiu.action.UserAction" method="add">
	<result name="success">/addUser.jsp</result>
</action>
<action name="updateUser" class="com.shawnqiu.action.UserAction" method="update">
	<result name="success">/updateUser.jsp</result>
</action>
<action name="deleteUser" class="com.shawnqiu.action.UserAction" method="delete">
	<result name="success">/deleteUser.jsp</result>
</action>
<action name="findUser" class="com.shawnqiu.action.UserAction" method="find">
	<result name="success">/findUser.jsp</result>
</action>

3. 若开发时使用统一的命名规范，则所有action可使用类似如下的一条替换即可

<action name="*_*" class="com.shawnqiu.action.{1}Action" method="{2}">
	<result name="success">/{1}_{2}Success.jsp</result>
</action>

如上所示，所有文件都采用统一的命名规范，第一个*为分类名称，第二个*为操作名，{1}和{2}分别代表第一个和第二个*的替换值，所有action实现类都命名为“分类名称+Action”。即：如果分类名称为User，操作名为list，则访问的action名为User_add.action，action实现类名为UserAction，返回页面的名为add_UserSuccess.jsp

<action name="User_list" class="com.shawnqiu.action.UserAction" method="list">
	<result name="success">/User_listSuccess.jsp</result>
</action>
<action name="User_add" class="com.shawnqiu.action.UserAction" method="add">
	<result name="success">/User_addSuccess.jsp</result>
</action>
<action name="User_update" class="com.shawnqiu.action.UserAction" method="update">
	<result name="success">/User_updateSuccess.jsp</result>
</action>
<action name="User_delete" class="com.shawnqiu.action.UserAction" method="delete">
	<result name="success">/User_deleteSuccess.jsp</result>
</action>
<action name="User_find" class="com.shawnqiu.action.UserAction" method="find">
	<result name="success">/User_findSuccess.jsp</result>
</action>

另：{0}代表显示所有通配符内容，如<result name="success">/{1}_{2}Success.jsp</result>改为<result name="success">/{0}Success.jsp</result>，则返回的名为User_addSuccess.jsp