apache etag配置

web.xml新增配置：

<filter>
<filter-name>etagFilter</filter-name>
<filter-class>org.springframework.web.filter.ShallowEtagHeaderFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>etagFilter</filter-name>
<url-pattern>/api/PaymentSetting/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>etagFilter</filter-name>
<url-pattern>/webapp/*</url-pattern>
</filter-mapping>