<interceptor-stack name="defaultStack"> <interceptor-ref name="exception"/> <interceptor-ref name="alias"/> <interceptor-ref name="servletConfig"/> <interceptor-ref name="prepare"/> <interceptor-ref name="i18n"/> <interceptor-ref name="chain"/> <interceptor-ref name="debugging"/> <interceptor-ref name="profiling"/> <interceptor-ref name="scopedModelDriven"/> <interceptor-ref name="modelDriven"/> <interceptor-ref name="fileUpload"/> <interceptor-ref name="checkbox"/> <interceptor-ref name="staticParams"/> <interceptor-ref name="params"> <param name="excludeParams">dojo..*</param> </interceptor-ref> <interceptor-ref name="conversionError"/> <interceptor-ref name="validation"> <param name="excludeMethods">input,back,cancel,browse</param> </interceptor-ref> <interceptor-ref name="workflow"> <param name="excludeMethods">input,back,cancel,browse</param> </interceptor-ref> </interceptor-stack>
首先，第一个是exception 用法如下，如果不用这个功能可以去掉
<action name="test"> <interceptor-ref name="exception"/> <interceptor-ref name="basicStack"/> <exception-mapping exception="com.acme.CustomException" result="custom_error"/> <result name="custom_error">custom_error.ftl</result> </action>第二个，是取别名的功能，也可以基本不用
<action name="someAction" class="com.examples.SomeAction"> <!– The value for the foo parameter will be applied as if it were named bar –> <param name="aliases">#{ ’foo’ : ’bar’ }</param> <interceptor-ref name="alias"/> <interceptor-ref name="basicStack"/> <result name="success">good_result.ftl</result> </action>第三个，看一下代码就明白了，这个有时还是能用到的，暂且保留好了（我们可以用 ServletActionContext代替）
if (action instanceof ServletRequestAware) {
HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST); ((ServletRequestAware) action).setServletRequest(request);
} if (action instanceof ServletResponseAware) {
HttpServletResponse response = (HttpServletResponse) context.get(HTTP_RESPONSE); ((ServletResponseAware) action).setServletResponse(response); } if (action instanceof ParameterAware) { ((ParameterAware) action).setParameters(context.getParameters()); } if (action instanceof RequestAware) { ((RequestAware) action).setRequest((Map) context.get("request")); } if (action instanceof SessionAware) { ((SessionAware) action).setSession(context.getSession()); } if (action instanceof ApplicationAware) { ((ApplicationAware) action).setApplication(context.getApplication()); }第四个 prepare 这个拦截器的控制粒度在方法级别，常用在一些方法的执行必须基于某某方法先执行
public String doIntercept(ActionInvocation invocation) throws Exception { Object action = invocation.getAction();
if (action instanceof Preparable) {
try { PrefixMethodInvocationUtil.invokePrefixMethod(invocation, new String[] { PREPARE_PREFIX, ALT_PREPARE_PREFIX });
} catch(Exception e) { // just in case there’s an exception while doing reflection, // we still want prepare() to be able to get called. LOG.warn("an exception occured while trying to execute prefixed method", e); } if (alwaysInvokePrepare) { ((Preparable) action).prepare(); 先执行 } } return invocation.invoke(); 后执行 }另外这个拦截器要设置
- excludeMethods - methods name to be excluded
- includeMethods - methods name to be included
这2个属性 因为它是继承自 MethodFilterInterceptor
第五个，就不用说了，非常重要 foo.action?request_locale=en_US
如果看不惯request_locale，可以设置掉 提供了
public void setParameterName(String parameterName) {
this.parameterName = parameterName;
}
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