MailAction：

public class MailAction extends ActionSupport {

	private SysuserinfoService sysuserinfoService;// 用户基本信息表

	private String email;

	private String errorMessage;

	private String username;// 账户

        set/get方法有的

struts.xml

<package name="mail" extends="commons">

		<action name="mailSendMail" method="sendMail"

			class="cn.edu.nwsuaf.comAction.MailAction">

			<result name="success">/page/mail/success.jsp</result>

			<result name="error">/page/mail/error.jsp</result>

			<result name="input">/login.jsp</result>

		</action>

	</package>

application.xml

<bean id="SysuserinfoService" class="cn.edu.nwsuaf.Service.Impl.SysuserinfoService">

		<property name="baseDao" ref="BaseDao"></property>

	</bean>

<!-- 邮件 -->

	<bean id="MailAction" class="cn.edu.nwsuaf.comAction.MailAction">

		<property name="sysuserinfoService" ref="SysuserinfoService"></property>

	</bean>

在经过一番查错和参考网上的解决方法，总结错误为：

是Struts2和Spring整合过程出了问题

struts.xml

<package name="mail" extends="commons">

		<action name="mailSendMail" method="sendMail"
class="MailAction">

			<result name="success">/page/mail/success.jsp</result>

			<result name="error">/page/mail/error.jsp</result>

			<result name="input">/login.jsp</result>

		</action>

	</package>

解决问题