配置文件：
---
web.mxl
spring security
<filter-mapping>
<filter-name>securityFilter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>INCLUDE</dispatcher>
</filter-mapping>
spring mvc
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
spring配置文件
<security:http pattern="/login.do" security="none" />
<security:http auto-config='false' access-decision-manager-ref="accessDecisionManager" entry-point-ref="authenticationEntryPoint" use-expressions="false" name="mainFilterChain">
<security:intercept-url pattern="/login.do" access="IS_AUTHENTICATED_ANONYMOUSLY" />
<bean id="authenticationEntryPoint" class="org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint">
<constructor-arg name="loginFormUrl" value="/login.do" />
</bean>
Controller
@RequestMapping(value= "/login", method = RequestMethod.GET)
public String doLogin(){
System.out.println("我要登录");
return "login";
}
在前台做一次登录为什么会重定向两次，也就是走了两遍doLogin()方法
