Distinguish <url-pattern> / </ url-pattern> and <url-pattern> / * </ url-pattern> different

When writing springMVC web.xml configuration will encounter Below sometimes write /, sometimes they write / ;
then both what difference does it make? I now make some explanation:
1. When configured <url-pattern>/</url-pattern>time, it will be matched to the type of path url, it will not match the pattern for the .jsp type the url
for example:

     <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      </servlet>
      <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/</url-pattern>
      </servlet-mapping>

This path can match / login / hello type url, but does not match the type index.jsp url.

2. When the configuration <url-pattern><url-pattern>/*<url-pattern>time, and it will match all types of url, including the path-type, various suffixes like.
E.g:

    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
          <param-name>encoding</param-name>
          <param-value>UTF-8</param-value>
        </init-param>
        <!--强制编码-->
        <init-param>
          <param-name>forceEncoding</param-name>
          <param-value>true</param-value>
        </init-param>
      </filter>
      <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
      </filter-mapping>

This can be filtered in various types of url, we .jsp, .html, / hello url and other types will be treated as a UTF-8 encoded.