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ehcache在struts2中的使用

StrutsJavaCacheCSSJSP 
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 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

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<%@ 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">  
    <!--  
    <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">  
    -->  
  </head>  
    
  <body>  
    <a href="colorAction.action" mce_href="colorAction.action">查看所有颜色</a>  
  </body>  
</html> 
<%@ 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">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">
 -->
  </head>
 
  <body>
    <a href="colorAction.action" mce_href="colorAction.action">查看所有颜色</a>
  </body>
</html>
 

2、ColorAction.java

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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CacheManager  
        CacheManager 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;  
    }  
 
} 
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CacheManager
  CacheManager 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。

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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;  
    }  
} 
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

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<%@ 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">  
    <!--  
    <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">  
    -->  
 
  </head>  
    
  <body>  
  <s:iterator value="list">  
    <s:property/><br>  
  </s:iterator>  
  </body>  
</html> 
<%@ 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">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">
 -->

  </head>
 
  <body>
  <s:iterator value="list">
    <s:property/><br>
  </s:iterator>
  </body>
</html>
 

5、ehcache.xml

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<ehcache> 
    <diskStore path="java.io.tmpdir" /> 
    <defaultCache maxElementsInMemory="10000" eternal="false" 
        timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" /> 
 
    <cache name="colorcache" maxElementsInMemory="10000" eternal="false" 
        timeToIdleSeconds="300" timeToLiveSeconds="600" overflowToDisk="true" /> 
</ehcache> 
<ehcache>
 <diskStore path="java.io.tmpdir" />
 <defaultCache maxElementsInMemory="10000" eternal="false"
  timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" />

 <cache name="colorcache" maxElementsInMemory="10000" eternal="false"
  timeToIdleSeconds="300" timeToLiveSeconds="600" overflowToDisk="true" />
</ehcache>
 

6、struts.xml

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<?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> 
<?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

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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;  
    }  
      
} 

 

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