ehcache在struts2中的使用

放假了，首先祝大家端午节快乐，今天下雨，没事干研究了下ehcache，从ehcache官网查看了一番后，看了看网上别人的blog，没有ehcache的详细用法，所以自己小试了一下，第一次使用ehcache可能有些地方不正确，希望大家帮我纠正，共同进步。

我采用struts2+ehcache。代码如下：

1、index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"> </head> <body> <a href="colorAction.action" mce_href="colorAction.action">查看所有颜色</a> </body></html>

2、ColorAction.java

package com.ehcache.servlet;import java.awt.Color;import java.util.ArrayList;import java.util.List;import java.util.Map;import net.sf.ehcache.Cache;import net.sf.ehcache.CacheManager;import net.sf.ehcache.Element;import com.ehcache.database.ColorDatabase;import com.ehcache.util.EhcacheUtil;import com.opensymphony.xwork2.ActionSupport;@SuppressWarnings("serial")public class ColorAction extends ActionSupport {private List<String> list = null;@SuppressWarnings("unchecked")public String allColor() throws Exception {//获取CacheManagerCacheManager cacheManager = EhcacheUtil.getCacheManager();list = new ArrayList<String>();//用配置文件中配置的colorcache创建cache缓存Cache cache = cacheManager.getCache("colorcache");//查看cache中是否存在allColor的缓存Element element = cache.get("allColor");//如果不存在，从数据库中查询if (element == null) {Map<String, Color> maps = ColorDatabase.getAllColor();java.util.Iterator<String> iter = maps.keySet().iterator();while (iter.hasNext()) {Color color = maps.get(iter.next());list.add(color.toString());}cache.put(new Element("allColor", list));} else {//如果存在，从缓存中加载list = (List<String>) element.getValue();}return "allColor";}public List<String> getList() {return list;}public void setList(List<String> list) {this.list = list;}}

3、ColorDatabase.java 代替数据库。

package com.ehcache.database;import java.awt.Color;import java.util.HashMap;import java.util.Map;/** * 在ehcache-2.1.0中的samples/colorcache 的例子中修改了一下，这个代替了数据库。 */public class ColorDatabase {private static Map<String,Color> colorMap = new HashMap<String,Color>();static{ colorMap.put("red", Color.red); colorMap.put("blue", Color.blue); colorMap.put("green", Color.green); colorMap.put("white", Color.white); colorMap.put("black", Color.black); colorMap.put("lightGray", Color.lightGray); colorMap.put("gray", Color.gray); colorMap.put("darkGray", Color.darkGray); colorMap.put("pink", Color.pink); colorMap.put("orange", Color.orange); colorMap.put("yellow", Color.yellow); colorMap.put("magenta", Color.magenta); colorMap.put("cyan", Color.cyan); }public static Map<String,Color> getAllColor(){return colorMap;}}

4、allColor.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@taglib prefix="s" uri="/struts-tags"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>My JSP 'allColor.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"> </head> <body> <s:iterator value="list"> <s:property/><br> </s:iterator> </body></html>

5、ehcache.xml

6、struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <package name="struts" extends="struts-default"> <action name="colorAction" class="com.ehcache.servlet.ColorAction" method="allColor"> <result name="allColor">/allColor.jsp</result> </action> </package></struts>

7、EhcacheUtil.java

package com.ehcache.util;import net.sf.ehcache.CacheManager;public class EhcacheUtil {private EhcacheUtil(){} private static CacheManager cacheManager = null; static{ cacheManager = CacheManager.create(); } public static CacheManager getCacheManager(){ return cacheManager; }}

秒客网

ehcache在struts2中的使用

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