Could not find action or result常见情况分析
=======1.struts.xml配置的action与我们访问的action或返回的result确实没有匹配导致。
我的struts.xml配置如下，action 的name为login，如果不小心把action访问输成loginn.action,多了个n别的，确实找不到action,报错情理之中，很好理解，一看就能找到错误.
如果输入action访问正确，还报错，一种简单情况就是result是别的，struts.xml配置中确实没有，也报错，解决很简单，result对应上就行。
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
<package name="login" extends="struts-default">
<!-- 定义拦截器 -->
<!-- <interceptors>
<interceptor name="security" class="com.lanhuigu.interceptor.SecurityInterceptor"/>
</interceptors> -->
<action name="login" class="com.lanhuigu.action.LoginAction" method="login">
<!-- 使用自定义拦截器，不用默认拦截器 -->
<!-- <interceptor-ref name="security"></interceptor-ref> -->
<!-- 登录成功，跳转到成功页面的首页 -->
<result name="success">/index.jsp</result>
<!-- 登录失败，跳转到登录页面，重新登录 -->
<result name="error">/login/jsp/login.jsp</result>
<!-- <result name="input">/login/jsp/login.jsp</result> -->
</action>
</package>
</struts>
======2.我们的action输入正确，返回结果经过无数次查看都是对的，就是报找不到action或者没有对应的result结果，我们也有解决办法.
++++2.1 查看项目下的struts.xml文件是否被编译上，有时我们分模块开发,细心检查自己的struts-xxx.xml是否被引入struts.xml中，即看你的
struts.xml中是否通过include引入子模块的struts-xxx.xml文件。
++++2.2 如果你采用以上手段，问题还没被解决，接着往下看，或许能给你点灵感。
人生最纠结的是，struts.xml文件等都正常，action,result都没错，访问action时，不进入action方法，直接给你返回input,而你的struts.xml文件的result确实没有一个叫name为input的对应，报错是必然的，如果你给加个input的result,确实可以给你指定映射视图，否则，直接给你来个Could not find action or result.....有没有无语，以下为详细错误。
！！！！！！！！！！！！！！！！！！！！！！
警告: Could not find action or result
No result defined for action com.lanhuigu.action.LoginAction and result input
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:364)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:266)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:619)
错误原因:
系统内部异常,也就是你写sturts的action时，继承了ActionSupport类，而ActionSupport类中的validate()方法对传入参数校验异常,ActionSupport中的方法如下：
/**
* A default implementation that validates nothing.
* Subclasses should override this method to provide validations.
*/
public void validate() {
}
详细可以看源码，但是这玩意是罪魁祸首。
报的错误代码行如下，就是我们看到错误的第一行，直接抛异常。
解决办法：
1.如果我们的action中重写了validata()方法，一定写好了，抛异常就报错，现在jquery-validata...校验的都很强大，没有必要用他，直接注释。
2.自己定义拦截器，不用sturts拦截器，对登录页面自行拦截处理。
<span style="color:#333333;"><?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
<package name="login" extends="struts-default">
<!-- 定义拦截器 -->
<<interceptors>
<interceptor name="security" class="com.lanhuigu.interceptor.SecurityInterceptor"/>
</interceptors>
<action name="login" class="com.lanhuigu.action.LoginAction" method="login">
<!-- 使用自定义拦截器，不用默认拦截器 -->
<interceptor-ref name="security"></interceptor-ref>
<!-- 登录成功，跳转到成功页面的首页 -->
<result name="success">/index.jsp</result>
<!-- 登录失败，跳转到登录页面，重新登录 -->
<result name="error">/login/jsp/login.jsp</result>
<!-- <result name="input">/login/jsp/login.jsp</result> -->
</action>
</package>
</struts>
</span>
自己定义拦截器，aop的思想，自己处理，自己校验判断，就避免代码进入struts拦截器，出现一堆系统内部异常，找问题费劲。
注意:一般不建议自定义拦截器，struts-default.xml中已经为struts2框架准备了'足够'的拦截器,不要给自己添麻烦，增加编码繁琐