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使用EHCache对页面进行缓存

2014-09-03 10:42 351 查看

需要的jar包：

commons-logging-1.0.3.jar

ehcache-core-2.6.9.jar

ehcache-web-2.0.4.jar

log4j-1.2.12.jar

mysql-connector-java-5.1.30.jar

slf4j-api-1.7.2.jar

ehcache.xml 配置文件

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd">

<diskStore path="d:/var/cache/"/>
<cache name="SimplePageFragmentCachingFilter"
maxElementsInMemory="10"
eternal="false"
timeToIdleSeconds="10000"  //多长时间不访问缓存，就清空缓存
timeToLiveSeconds="20"  //缓存生存时间
overflowToDisk="true"
memoryStoreEvictionPolicy="LFU">
</cache>

</ehcache>

web.xml 配置文件

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>CacheDemo</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>SimplePageFragmentCachingFilter</filter-name>
<filter-class>net.sf.ehcache.constructs.web.filter.SimplePageFragmentCachingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SimplePageFragmentCachingFilter</filter-name>
<url-pattern>*.svl</url-pattern>
</filter-mapping>
</web-app>

ehcache_index.jsp 文件

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.util.Date"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
function addHtml() {
//alert("run addHtml");
var name = "testCookie";
var cookieVal;
var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
if(arr=document.cookie.match(reg))
cookieVal = unescape(arr[2]);
else
cookieVal = "kongde";
document.getElementById("test").innerHTML="<font>"+cookieVal+"</font>";
if(cookieVal != "kongde") {
document.cookie = name + "="+ (parseInt(cookieVal)+1);
//alert("cookie的值加一");
}
}
</script>
</head>
<body onload="addHtml()">
整个请求链接缓存时间20秒(相当于整个页面缓存时间20秒)<br/><br/>
<%@ include file="head.html" %>
<br/>日期: <%= new Date() %><br/>
<br/><a href="http://www.baidu.com" target="_blank">baidu</a>
</body>
</html>

head.html 文件

<div>
I am head ---------- testCookie's value is <span id="test"></span>
</div>

Myservlet.java 文件

package com.demo.cache;

import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class Myservlet
*/
@WebServlet("/indexservlet.svl")
public class Myservlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static int count = 0;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("第"+(++count)+"次运行Myservlet");
boolean booleanTemp = true;
Cookie[] cookies = request.getCookies();
if(cookies != null) {
for(Cookie cookie: cookies) {
if("testCookie".equals(cookie.getName())) {
booleanTemp = false;
break;
}
}
}
if(booleanTemp) {
System.out.println("添加名为testCookie的cookie");
Cookie cookie = new Cookie("testCookie", "0");
cookie.setPath("/");
response.addCookie(cookie);
}
DB db = new DB();
ResultSet rs = db.getQuery("select * from user");
try {
while(rs.next()) {
System.out.println("id: "+rs.getInt("id")+"; name: "+rs.getString("name"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
db.close(db.getCon(), db.getStmt(), rs);
}
request.getRequestDispatcher("WEB-INF/ehcache_index.jsp").forward(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}

}

DB.java 文件

package com.demo.cache;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DB {
private final static String name="root";
private final static String pwd="***";
private Connection con;
private Statement stmt;
public DB(){
con = null;
stmt = null;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8", name, pwd);
stmt = con.createStatement();
}
catch(Exception e){
e.printStackTrace();;
}
}
public ResultSet getQuery(String queryStr){
ResultSet result = null;
try{
System.out.println("对数据库进行访问");
result = stmt.executeQuery(queryStr);
}catch(Exception ex){
ex.printStackTrace();;
}
return result;
}

public void close(Connection con, Statement stmt, ResultSet rs ) {
if(null != con) {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if(null != stmt) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if(null != rs) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
System.out.println("关闭数据库连接");
}

public Connection getCon() {
return con;
}

public void setCon(Connection con) {
this.con = con;
}

public Statement getStmt() {
return stmt;
}

public void setStmt(Statement stmt) {
this.stmt = stmt;
}

}

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标签： ehcache 页面缓存

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