spring mvc 支持options方法

1. <servlet>
2. <servlet-name>springdispatcherservlet-name>
3. <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
4. <init-param>
5. <param-name>contextConfigLocationparam-name>
6. <param-value>classpath:springMvc-viewresolver.xmlparam-value>
7. init-param>
8. <init-param>
9. <param-name>dispatchOptionsRequestparam-name>
10. <param-value>trueparam-value>
11. init-param>
12. <load-on-startup>1load-on-startup>
13. servlet>