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一. 简介
oscache是一个广泛采用的高性能的j2ee缓存框架，能应用于任何java应用程序的普通的缓存解决方案。
二. 特点
1. 可以缓存任何对象， 你可以不受限制的缓存部分jsp页面或http请求，任何java对象都能缓存
2. 可以永久缓存，因为缓存能随意的写入硬盘
3. 支持集群
4. 可以控制缓存对象的过期
三. 使用
1.对局部页面缓存
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://www.opensymphony.com/oscache" prefix="cache"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<h1>测试1</h1>
没有缓存的日期:
<%=new Date()%>
<br>
<!-- 页面局部缓存，使用标签 -->
<cache:cache time="5" key="cacheDate" scope="application">
缓存局部页面，每5秒刷新缓存一次，日期: <%=new Date()%>
</cache:cache>
<br>
</body>
</html>2.对整个页面缓存
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib uri="http://www.opensymphony.com/oscache" prefix="cache"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <!-- 页面全局缓存，在web.xml中配置 --> <h1>测试2</h1> 缓存整个页面，每10秒刷新缓存一次，日期:<%=new Date()%> <br> </body> </html>3.缓存对象
public class CacheServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) {
int refreshPeriod = 10; // cache in 6 seconds
GeneralCacheAdministrator cache = new GeneralCacheAdministrator();
try {
// get data from cache
Date myDate = (Date) cache.getFromCache("myDate", refreshPeriod);
System.out.println("current date is : " + myDate);
} catch (NeedsRefreshException e) {
try {
Date myDate = new Date();
// put data into cache
cache.putInCache("myDate", myDate);
} catch (Exception ex) {
cache.cancelUpdate("myDate");
}
}
}
}oscache.properties
#默认在内存中作缓存，如设置为false，那cache只能缓存到数据库或硬盘中 cache.memory=false #持久化缓存类，如此类打开，则必须设置cache.path信息 cache.persistence.class=com.opensymphony.oscache.plugins.diskpersistence.DiskPersistenceListener #建立磁盘缓存 cache.path=D\:\\cache #缓存元素个数 cache.capacity=1000 #cache.cluster 为集群设置信息。如 #cache.cluster.multicast.ip为广播IP地址 #cache.cluster.properties为集群属性web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <filter> <filter-name>CacheFilter</filter-name> <!-- CacheFilter只捕获Http头为200的页面请求，即只对无错误请求作缓存 --> <filter-class>com.opensymphony.oscache.web.filter.CacheFilter</filter-class> <init-param> <!-- 缓存内容的时间段，单位是秒，默认是3600秒 --> <param-name>time</param-name> <param-value>10</param-value> </init-param> <init-param> <param-name>scope</param-name> <param-value>application</param-value> </init-param> </filter> <!-- cache all the cache.jsp file --> <filter-mapping> <filter-name>CacheFilter</filter-name> <url-pattern>/cache2.jsp</url-pattern> </filter-mapping> <servlet> <servlet-name>cacheServlet</servlet-name> <servlet-class>com.zdp.cache.CacheServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>cacheServlet</servlet-name> <url-pattern>/cacheServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>cache1.jsp</welcome-file> </welcome-file-list> </web-app>四. 核心API - GeneralCacheAdministrator:
1.void putInCache(String key,Object content);//put on Object in a cache
2.Object getFromCache(String key);// get on Object from the Cache
3.void removeEntry(String key);// remove an Object in a cache
4.void flushEntry(String key);// flushes a single cache entry
5.void flushAll();// flush the entire cache immediately
6.void cancelUpdate(String key);// cacels a pending cache update
参加资料：http://www.cnblogs.com/huzi007/p/3873396.html
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原文地址：http://blog.csdn.net/zdp072/article/details/45293451
