Use of caching techniques (level two cache of Hibernate or JPA, and caching at the page JSP level) __JS

Oscache: Designed by Opensymphony, it is a groundbreaking JSP custom tag application that provides the ability to implement fast memory buffering within existing JSP pages.

Business Description: The site for infrequently changed content can use the page of the local cloth cache, improve the speed of Web site access

One, global cache
1, introduce Jar Oscache-2.4.1.jar
2 Configuration Oscache.properties
3 Specifies the number of objects cached in memory cache.capacity=10000
4 Specify the cache expiration time in Web.xml. And which access paths are cached
<!--page cache, cached for 5 minutes-->
<filter>
<filter-name>CacheFilter</filter-name>
<filter-class>com.opensymphony.oscache.web.filter.CacheFilter</filter-class>
<init-param>
<param-name>time</param-name>
<param-value>300</param-value>
</init-param>
<init-param>
<param-name>scope</param-name>
<param-value>application</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CacheFilter</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
Second, the cloth cache
(1) Introduction of Jar Oscache-2.4.1.jar
(2) Reference cache label <% @taglib uri= "/web-inf/lib/oscache-2.4.1.jar" prefix= "OS"%>
(3) Put the need for the contents of the cache into the cache tag <os:cache time= "Ten" > <%=new Date ()%></os:cache>
You can also specify expiration time, refresh, scope
Parameter description:
Time= "10" Specifies the expiration time
Refresh= "False" is always refreshed
Scope= "Request" Cache scope request,page,session,application

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Ehcache: is a pure Java in-process caching framework, with fast, lean and so on, is the hibernate default Cacheprovider.

1>. Configuring Echcache.xml Files

<?xml version= "1.0" encoding= "UTF-8"?>
<ehcache>
<defaultcache maxelementsinmemory= "10000" eternal= "false" timetoidleseconds= "1200" timetoliveseconds= "1200" Overflowtodisk= "false" >
</defaultCache>
<!--a separate cache policy setting for a entity
<cache name= "com.payment.entity.PromotionEntity" maxelementsinmemory= "100"
Eternal= "false"
timetoidleseconds= "1200" timetoliveseconds= "1200" overflowtodisk= "false"
Clearonflush= "true" >
</cache>-->
</ehcache>

2>: Open Level Two cache, modify Persistence.xml file (here for JPA, the hibernate level two cache has already been written blog, here is no longer written)

<?xml version= "1.0"?>
<persistence xmlns= "http://java.sun.com/xml/ns/persistence" xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"
xsi:schemalocation= "Http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1 _0.xsd "version=" 1.0 ">
<persistence-unit name= "Education" transaction-type= "resource_local" >
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name= "Hibernate.dialect" value= "Org.hibernate.dialect.MySQL5Dialect"/>
<property name= "Hibernate.max_fetch_depth" value= "3"/>
<property name= "Hibernate.hbm2ddl.auto" value= "Update"/>
<property name= "hibernate.jdbc.fetch_size" value= "/>"
<property name= "Hibernate.jdbc.batch_size" value= "ten"/>
<property name= "Hibernate.show_sql" value= "true"/>
<property name= "Hibernate.format_sql" value= "false"/>
<!--set up Tier II cache vendor-->
<property name= "Hibernate.cache.provider_class" value= "Org.hibernate.cache.EhCacheProvider"/>
<property name= "hibernate.cache.provider_configuration" value= "/ehcache.xml"/>
<property name= "Hibernate.cache.use_query_cache" value= "true"/>
<property name= "Hibernate.cache.use_second_level_cache" value= "true"/>
<property name= "Hibernate.cache.use_structured_entries" value= "true"/>
</properties>
</persistence-unit>
</persistence>

3>. Specifies that the entity classes use level Two caching: 1, add annotations on the entity, 2, set the cache before querying, and then query.