项目中用到OSCache来实现jsp页面缓存功能的杂谈

06-01-12 python
本人是一新手,项目中用到OSCache来实现jsp页面缓存功能,自己大概总结了一下,有不足之处,请大家别见笑!

1.jsp页面中定义。

<%@ taglib uri="oscache" prefix="cache" %>

<cache:cache key="关键字" time="300" scope="application">

...要缓存的部分...

</cache:cache>

2.web.xml中定义。

<taglib>

<taglib-uri>oscache</taglib-uri>

<taglib-location>/WEB-INF/classes/oscache.tld</taglib-location>

</taglib>

3.oscache.tld

......

<name>cache</name>

<tag-class>com.opensymphony.oscache.web.tag.CacheTag</tag-class>

<body-content>JSP</body-content>

........

4.用的是oscache-2.1.jar

放在你的应用服务器lib\目录下或你的应用程序\WEB-INF\lib\下

注意的地方:

有cache的地方,session就不能用了。

搜索页面部分不要用cache,每个人搜索的内容都不一样的。

关键子的定义,每个页面的关键子当然都不一样的,另外如果有分页,得把分页参数取得,放入关键字里,(不然的话,每页内容都一样了),如果还有其他的传入参数,比如查看不同分类,会有不同分类的ID,也要放到关键字里。

执行一次JSP,而后在设定的时间内,客户端访问的都是HTML页面。

小弟是一新手,大家见笑了!

    

3
python
2006-01-12 17:09
1.jsp页面中定义。

《%@ taglib uri="oscache" prefix="cache" %》

《cache:cache key="关键字" time="300" scope="application"》

...要缓存的部分...

《/cache:cache》

2.web.xml中定义。

《taglib》

《taglib-uri》oscache《/taglib-uri》

《taglib-location》/WEB-INF/classes/oscache.tld《/taglib-location》

《/taglib》

3.oscache.tld

......

《name》cache《/nam》

《tag-class》com.opensymphony.oscache.web.tag.CacheTag《/tag-class》

《body-content》JSP《/body-content》

........

banq
2006-01-12 17:13
非常不错,贴代码时,选择上方的Code即可。

在web.xml中,配置OScache拦截时,好像只能是*.jsp,如果是*就出错。

python
2006-01-12 17:17
好兴奋,感谢斑竹的肯定,以后我会把工作中的经验发到这里,和大家一起分享!大家共同进步!

cute
2006-01-13 14:24
我在一个门户网站中就全面用到了OSCACHE缓存系统,我感觉还是不错的。

搂住说的功能,是实现内存缓存方式。另外一种就是磁盘缓存,可以在OSCACHE配置文件中,指定磁盘物理目录,系统运行后,就会把缓存的页面,全部以文件形式存储在目录中。后者一般是针对内存不足以够的情况下使用。

缓存的数据每30分钟自动刷新数据,这是默认的。可以在WEB。XML中指定刷新时间,也可以手工刷新。

另外,OSCache还支持集群功能.

磁盘缓存实现:

oscache.properties

# CACHE IN MEMORY
#
# If you want to disable memory caching, just uncomment this line.
#
cache.memory=false


# CACHE KEY 
#
# This is the key that will be used to store the cache in the application
# and session scope.
#
# If you want to set the cache key to anything other than the default
# uncomment this line and change the cache.key
#
# cache.key=__oscache_cache


# USE HOST DOMAIN NAME IN KEY
#
# Servers for multiple host domains may wish to add host name info to
# the generation of the key.  If this is true, then uncomment the
# following line.
#
# cache.use.host.domain.in.key=true


# CACHE LISTENERS
#
# These hook OSCache events and perform various actions such as logging
# cache hits and misses, or broadcasting to other cache instances across a cluster.
# See the documentation for further information.
#
# cache.event.listeners=com.opensymphony.oscache.plugins.clustersupport.JMSBroadcastingListener,  \
#                       com.opensymphony.oscache.extra.CacheEntryEventListenerImpl,               \
#                       com.opensymphony.oscache.extra.CacheMapAccessEventListenerImpl,           \
#                       com.opensymphony.oscache.extra.ScopeEventListenerImpl


# CACHE PERSISTENCE CLASS
#
# Specify the class to use for persistence. If you use the supplied DiskPersistenceListener,
# don't forget to supply the cache.path property to specify the location of the cache
# directory.
# 
# If a persistence class is not specified, OSCache will use memory caching only.
#
#cache.persistence.class=com.opensymphony.oscache.plugins.diskpersistence.HashDiskPersistenceListener
cache.persistence.class=com.opensymphony.oscache.plugins.diskpersistence.HashDiskPersistenceListener
# CACHE OVERFLOW PERSISTENCE
# Use persistent cache in overflow or not. The default value is false, which means
# the persistent cache will be used at all times for every entry.  true is the recommended setting.
#
#cache.persistence.overflow.only=false

# CACHE DIRECTORY
#
# This is the directory on disk where caches will be stored by the DiskPersistenceListener.
# it will be created if it doesn't already exist. Remember that OSCache must have
# write permission to this directory.
#
# Note: for Windows machines, this needs \ to be escaped
# ie Windows:
# cache.path=c:\\myapp\\cache
# or *ix:
# cache.path=/opt/myapp/cache
#
cache.path=F:\\jboss-3.2.1\\server\\default\\deploy\\weihai.war\\powercache


# CACHE ALGORITHM
#
# Default cache algorithm to use. Note that in order to use an algorithm
# the cache size must also be specified. If the cache size is not specified,
# the cache algorithm will be Unlimited cache.
#
 cache.algorithm=com.opensymphony.oscache.base.algorithm.LRUCache
# cache.algorithm=com.opensymphony.oscache.base.algorithm.FIFOCache
# cache.algorithm=com.opensymphony.oscache.base.algorithm.UnlimitedCache

# THREAD BLOCKING BEHAVIOR
#
# When a request is made for a stale cache entry, it is possible that another thread is already
# in the process of rebuilding that entry. This setting specifies how OSCache handles the
# subsequent 'non-building' threads. The default behaviour (cache.blocking=false) is to serve
# the old content to subsequent threads until the cache entry has been updated. This provides
# the best performance (at the cost of serving slightly stale data). When blocking is enabled,
# threads will instead block until the new cache entry is ready to be served. Once the new entry
# is put in the cache the blocked threads will be restarted and given the new entry.
# Note that even if blocking is disabled, when there is no stale data available to be served
# threads will block until the data is added to the cache by the thread that is responsible
# for building the data.
cache.blocking=true


# CACHE SIZE
#
# Default cache size in number of items. If a size is specified but not
# an algorithm, the cache algorithm used will be LRUCache.
cache.capacity=4000



# CACHE UNLIMITED DISK ??????????????????1000??????????1000???LRU?????????????????
# Use unlimited disk cache or not. The default value is false, which means
# the disk cache will be limited in size to the value specified by cache.capacity.
cache.unlimited.disk=true



# JMS CLUSTER PROPERTIES
#
# Configuration properties for JMS clustering. See the clustering documentation
# for more information on these settings.
#
#cache.cluster.jms.topic.factory=java:comp/env/jms/TopicConnectionFactory
#cache.cluster.jms.topic.name=java:comp/env/jms/OSCacheTopic
#cache.cluster.jms.node.name=node1


# JAVAGROUPS CLUSTER PROPERTIES
#
# Configuration properites for the JavaGroups clustering. Only one of these
# should be specified. Default values (as shown below) will be used if niether
# property is set. See the clustering documentation and the JavaGroups project
# (www.javagroups.com) for more information on these settings.
#
#cache.cluster.properties=UDP(mcast_addr=231.12.21.132;mcast_port=45566;ip_ttl=32;\
#mcast_send_buf_size=150000;mcast_recv_buf_size=80000):\
#PING(timeout=2000;num_initial_members=3):\
#MERGE2(min_interval=5000;max_interval=10000):\
#FD_SOCK:VERIFY_SUSPECT(timeout=1500):\
#pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800;max_xmit_size=8192):\
#UNICAST(timeout=300,600,1200,2400):\
#pbcast.STABLE(desired_avg_gossip=20000):\
#FRAG(frag_size=8096;down_thread=false;up_thread=false):\
#pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;shun=false;print_local_addr=true)
#cache.cluster.multicast.ip=231.12.21.132
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