今天发现了这个异常，后经过检查才知道，产生这个异常的原因是因为struts.xml里配置文件时，少配置了<result name="input">/index.jsp</result>
这一行才导致的错误！
<struts>
<package name="default" namespace="/" extends="struts-default">
<action name="login" class="com.dhc.pms.action.LoginAction"
method="execute">
<result name="success">/welcome.jsp</result>
<result name="login">/index.jsp</result>
<result name="input">/index.jsp</result>
</action>
</package>
</struts>
input对应页面用于输入校验或类型转换出错时转向的页面
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