经过研究发现，Liferay缓存是通过filter实现的，即 com.liferay.portal.servlet.filters.layoutcache.LayoutCacheFilter，在 system.properties中有对应的设置， com.liferay.portal.servlet.filters.layoutcache.LayoutCacheFilter=false，则 每次都有对服务器重新请求。
飞速按他说的去做，发现没反映，研究发现，这只是针对开发环境的设置。所以在Tomcat目录中找到
web.xml（D:/lifeportal/tomcat/webapps/ROOT/WEB-INF）,打开后修改如下：
将：
<filter>
<filter-name>Layout Cache Filter - Friendly</filter-name>
<filter-class>com.liferay.portal.servlet.filters.layoutcache.LayoutCacheFilter</filter-class>
<init-param>
<param-name>pattern</param-name>
<param-value>0</param-value>
</init-param>
</filter>
<filter>
<filter-name>Layout Cache Filter - Layout</filter-name>
<filter-class>com.liferay.portal.servlet.filters.layoutcache.LayoutCacheFilter</filter-class>
<init-param>
<param-name>pattern</param-name>
<param-value>1</param-value>
</init-param>
</filter>
<filter>
<filter-name>Layout Cache Filter - Resource</filter-name>
<filter-class>com.liferay.portal.servlet.filters.layoutcache.LayoutCacheFilter</filter-class>
<init-param>
<param-name>pattern</param-name>
<param-value>2</param-value>
</init-param>
</filter>
改为：<filter>
<filter-name>Layout Cache Filter - Friendly</filter-name>
<filter-class>com.liferay.portal.servlet.filters.layoutcache.LayoutCacheFilter</filter-class>
<init-param>
<param-name>pattern</param-name>
<param-value>0</param-value>
</init-param>
</filter>
<filter>
<filter-name>Layout Cache Filter - Layout</filter-name>
<filter-class>com.liferay.portal.servlet.filters.layoutcache.LayoutCacheFilter</filter-class>
<init-param>
<param-name>pattern</param-name>
<param-value>0</param-value>
</init-param>
</filter>
<filter>
<filter-name>Layout Cache Filter - Resource</filter-name>
<filter-class>com.liferay.portal.servlet.filters.layoutcache.LayoutCacheFilter</filter-class>
<init-param>
<param-name>pattern</param-name>
<param-value>0</param-value>
</init-param>
</filter>