Struts使用标签的问题

使用html:cancel标签需要注意一些问题，否则配置好以后也会出错。

下面看看解决方案吧：

Any existing applications that use the Cancel processing will need to modify their struts-config.xml to set the cancellable property for actions which require it.

In Struts 1.2.9 the <set-property> is used to set the cancellable property for an action....

    <action path="/fooAction"input="/foo.jsp"validate="true"><set-property property="cancellable" value="true"/><forward name="success" path="/bar.jsp"/></action>

From Struts 1.3.x a new cancellable attribute can be used....

    <action path="/fooAction"input="/foo.jsp"validate="true"cancellable="true"><forward name="success" path="/bar.jsp"/></action>

In both Struts 1.2.9 and Struts 1.3.x an exception handler can be configured to handle the InvalidCancelException

    <action path="/fooAction"input="/foo.jsp"validate="true"cancellable="true"><forward name="success" path="/bar.jsp"/><exception key="errors.cancel"type="org.apache.struts.action.InvalidCancelException"path="/foo.jsp"/></action>