struts2 拦截器
如果struts.xml的action里配置了拦截器 则默认不加载struts-default.xml里的拦截器
如果需要则要手工加入：
<action name="register" class="com.test.action.RegisterAction">
<result>/success.jsp</result>
<result name="input">/register.jsp</result>
<!-- 拦截器 -->
<interceptor-ref name="myInterceptor"></interceptor-ref>
<!-- 默认拦截器 -->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
<result>/success.jsp</result>
<result name="input">/register.jsp</result>
<!-- 拦截器 -->
<interceptor-ref name="myInterceptor"></interceptor-ref>
<!-- 默认拦截器 -->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
给拦截器传递参数：方法一
<interceptors>
<interceptor name="myInterceptor" class="com.test.interceptor.MyInterceptor">
<param name="hello">world</param>
</interceptor>
</interceptors>
<interceptor name="myInterceptor" class="com.test.interceptor.MyInterceptor">
<param name="hello">world</param>
</interceptor>
</interceptors>
然后再MyInterceptor.java里定义
在init()里启动时就可以看到
给拦截器传递参数：方法二：在action 里传递参数
<action name="register" class="com.test.action.RegisterAction">
<result>/success.jsp</result>
<result name="input">/register.jsp</result>
<!-- 拦截器 -->
<interceptor-ref name="myInterceptor">
<param name="hello">welcome</param>
</interceptor-ref>
<!-- 默认拦截器 -->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
<result>/success.jsp</result>
<result name="input">/register.jsp</result>
<!-- 拦截器 -->
<interceptor-ref name="myInterceptor">
<param name="hello">welcome</param>
</interceptor-ref>
<!-- 默认拦截器 -->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
启动是显示 welcome 会覆盖上面的那个 world
拦截器栈
<interceptor-stack name="myStack">
<!-- 按顺序执行 先配置的先执行 最后结束 (先进后出)：先执行myInterceptor，在执行myInterceptor2 然后 myInterceptor2结束 ，
最后 myInterceptor结束-->
<interceptor-ref name="myInterceptor"></interceptor-ref>
<interceptor-ref name="myInterceptor2"></interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</interceptor-stack>
<!-- 按顺序执行 先配置的先执行 最后结束 (先进后出)：先执行myInterceptor，在执行myInterceptor2 然后 myInterceptor2结束 ，
最后 myInterceptor结束-->
<interceptor-ref name="myInterceptor"></interceptor-ref>
<interceptor-ref name="myInterceptor2"></interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</interceptor-stack>
以上拦截所有的action方法
下面 方法过滤拦截器 MethodFilterInterceptor() 拦截某个具体的方法
拦截器要继承 MethodFilterInterceptor 并实现doIntercept(ActionInvocation invocation)
<action name="register" class="com.test.action.RegisterAction" method="test">
<result>/success.jsp</result>
<result name="input">/register.jsp</result>
<interceptor-ref name="myInterceptor3">
<!-- 拦截RegisterAction 的test 和execute 方法-->
<param name="includeMethods">test,execute</param>
<!-- excludeMethods 排除 -->
<param name="excludeMethods">test,execute</param>
</interceptor-ref>
<!--defaultStack 放在后面否则不会执行myInterceptor3 注意顺序-->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
<result>/success.jsp</result>
<result name="input">/register.jsp</result>
<interceptor-ref name="myInterceptor3">
<!-- 拦截RegisterAction 的test 和execute 方法-->
<param name="includeMethods">test,execute</param>
<!-- excludeMethods 排除 -->
<param name="excludeMethods">test,execute</param>
</interceptor-ref>
<!--defaultStack 放在后面否则不会执行myInterceptor3 注意顺序-->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
includeMethods 优先级要高于 excludeMethods 。
2022年9月29日 01:13
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