知识大全用CashFilter实现页面级缓存实践

Posted 2022-07-21 知

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　　 mysql在本地localhost的test数据库建person表暂以字段id name password 表中可输入一行值

　　建类 DAOUtil

　　import java sql Connection;import java sql DriverManager;

　　public class DAOUtil public DAOUtil()

　　public static Connection getConn() Connection conn = null; String db_url = jdbc:mysql:// : /test?useUnicode=true&characterEncoding=gb ; String db_user = root ; String db_password= admin ; String db_driver = mysql jdbc Driver ;

　　try Class forName(db_driver); conn = DriverManager getConnection(db_url db_user db_password); catch (Exception ex) ex printStackTrace(); return conn;

　　/** * dbclose * 关闭Connection Statement * @param conn Connection * @param stmt Statement */ public static void dbclose(Connection conn Statement stmt) try if (stmt != null) stmt close(); catch (Exception e) e printStackTrace(); try if (conn != null) conn close(); catch (Exception e) e printStackTrace();

　　建类 PersonDAO

　　import java util *;import java sql Connection;import java sql Statement;import java sql ResultSet;

　　public class PersonDAO static PersonDAO pdao; public static PersonDAO getInstance() if (pdao == null) synchronized (PersonDAO class) pdao = new PersonDAO(); return pdao;

　　public PersonDAO() super();

　　public static void main(String[] args) System out println( person=== +PersonDAO getInstance() getPersonInfo()); private static List getPersonInfo() String name = ; String password = ; Connection conn = null; List list = new java util ArrayList(); Statement stmt = null; String sql = select name password from person ; try conn = DAOUtil getConn(); stmt = conn createStatement(); ResultSet rs = stmt executeQuery(sql); while (rs next()) name = (String)rs getString( name ); password = (String)rs getString( password ); list add(name+ +password); catch (Exception ex) ex printStackTrace(); finally DAOUtil dbclose(conn stmt); return list;

　　建testCache jsp testCache jsp

　　<%@page contentType= text/; charset=GBK %><%@page import= mcsky dao PersonDAO session= false %><%@page import= java util List session= false %><><body bgcolor= #FFFFFF >test hello world!!<p> <table width= % border= align= center > <tr> <td width= % height= > <div align= center >序号</div></td> <td width= % ><div align= center >名字</div></td> <td width= % ><div align= center >密码 </div></td> </tr><%//todo connect mysql server (localhost root/admin) and test(db) person(table)List list =PersonDAO getInstance() getPersonInfo();System out println( size=== +list size());for(int i= ;i<list size();i++)String namePass = (String)list get(i);java util StringTokenizer st = new java util StringTokenizer(namePass );String name = st nextToken();String pass = st nextToken();System out println( namePass+++++ +namePass);%> <tr> <td><div align= center ><%=i+ %></div></td> <td> <div align= center ><%=name%></div></td> <td><div align= center ><%=pass%></div></td> </tr> <% %> </table>

　　</body></>

　　把module部署在tomcat的webapp下

　　在WEB INF\\lib\\log j jar mysql connector java stable bin jar oscache jar mons logging jar jgroups all jar

　　在WEB INF\\classes拷贝cach\\etc\\下的oscache tld oscache properties

　　只对/testCache jsp缓存

　　修改WEB INF\\web xml

　　<?xml version= encoding= UTF ?><!DOCTYPE web app PUBLIC //Sun Microsystems Inc //DTD Web Application //EN app_ _ dtd ><web app> <display name>test</display name> <taglib><taglib uri>oscache</taglib uri><taglib location>/WEB INF/classes/ oscache tld</taglib location></taglib> <filter> <filter name>CacheFilter</filter name> <filter class> opensymphony oscache web filter CacheFilter</filter class> </filter> <filter mapping> <filter name>CacheFilter</filter name> <url pattern>/testCache jsp</url pattern> </filter mapping> </web app>

　　启动tomcat 在mysql的person中增加一条记录发现已对/testCache jsp页面进行缓存而/testCache jsp页面未缓存如去掉黑体则数据表增加一行 testCache jsp也随之修改

　　对所有的jsp缓存

　　修改WEB INF\\web xml

　　<?xml version= encoding= UTF ?><!DOCTYPE web app PUBLIC //Sun Microsystems Inc //DTD Web Application //EN app_ _ dtd ><web app> <display name>test</display name> <filter> <filter name>CacheFilter</filter name> <filter class> opensymphony oscache web filter CacheFilter</filter class> <init param> <param name>time</param name> <param value> </param value> </init param> <init param> <param name>scope</param name> <param value>session</param value> </init param> </filter> <filter mapping> <filter name>CacheFilter </filter name> <url pattern>* jsp</url pattern> </filter mapping></web app>

cha138/Article/program/Java/JSP/201311/19148

知识大全 用CashFilter实现页面级缓存实践

知识大全用CashFilter实现页面级缓存实践