在Tomcat中，可以通过配置web.xml文件来设置缓存策略。以下是一些常见的缓存策略设置：
设置静态资源的缓存时间：可以通过配置<web-app> <filter> <filter-name>ExpiresFilter</filter-name> <filter-class>org.apache.catalina.filters.ExpiresFilter</filter-class> <init-param> <param-name>ExpiresByType image</param-name> <param-value>access plus 1 month</param-value> </init-param> </filter> <filter-mapping> <filter-name>ExpiresFilter</filter-name> <url-pattern>*.png</url-pattern> </filter-mapping></web-app><web-app> <filter> <filter-name>NoCacheFilter</filter-name> <filter-class>org.apache.catalina.filters.NoCacheFilter</filter-class> </filter> <filter-mapping> <filter-name>NoCacheFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app><web-app> <filter> <filter-name>ETagFilter</filter-name> <filter-class>org.apache.catalina.filters.ETagFilter</filter-class> </filter> <filter-mapping> <filter-name>ETagFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app>通过以上配置，可以在Tomcat中设置不同的缓存策略来优化网站性能。
