Springmvc restful配置遇到的小坑

<!-- spring-mvc -->
<servlet>
<servlet-name>springServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<!-- 对url进行简单的过滤 -->
<filter>
<filter-name>servletRequest</filter-name>
<filter-class>cn.tomcat.quickstart.common.filter.ServletRequestFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>servletRequest</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
ServletRequestFilter.java
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.filter.OncePerRequestFilter;
/**
* 
* 对进来的url进行处理,放在filter最前面,springmvc <url-pattern>/</url-pattern>
* 默认拦截所有请求,ex:a/b/c.do,a/b/c.html,a/b/c.action,a/b/c
* 去掉带后缀的访问,模仿restful风格,只接受a/b/c的请求
* 
*/
public class ServletRequestFilter extends OncePerRequestFilter {
@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
String requestPath = request.getServletPath();
//不用担心会把静态文件给拦截了，例如*.js,*.css类似于这样的，在web.xml做处理了
//所有请求带有后缀【.】的直接去404,不接受这样的请求
if(requestPath.lastIndexOf(".")!=-1){
request.getRequestDispatcher("/WEB-INF/pages/error/404.jsp").forward(request, response);
}else{
filterChain.doFilter(request, response);
}
}
}