使用oscache提高程序性能

来源：互联网发布：linux 下的虚拟机编辑：程序博客网时间：2024/05/21 19:41

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 secondsGeneralCacheAdministrator cache = new GeneralCacheAdministrator();try {// get data from cacheDate myDate = (Date) cache.getFromCache("myDate", refreshPeriod); System.out.println("current date is : " + myDate); } catch (NeedsRefreshException e) {try {Date myDate = new Date();// put data into cachecache.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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