1.mysql在本地localhost的test數據庫 建person表,暫以字段id,name,password?,表中可輸入一行值.
2.建類 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://127.0.0.1:3306/test?useUnicode=true&characterEncoding=gb2312";
??????? String db_user = "root";
??????? String db_password= "admin";
??????? String db_driver = "com.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
? * 關閉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();
?????? }
?? }
}
3.建類 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;
????? }?
}
4.建testCache.jsp,testCache2.jsp
<%@page contentType="text/html; charset=GBK"%>
<%@page import="com.mcsky.dao.PersonDAO" session="false"%>
<%@page import="java.util.List" session="false"%>
<html>
<body bgcolor="#FFFFFF">
test ,hello world!!<p>
? <table width="85%" border="1" align="center">
?? <tr>
????? <td width="8%" height="20"> <div align="center">序號</div></td>
????? <td width="12%"><div align="center">名字</div></td>
????? <td width="17%"><div align="center">密碼 </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=0;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+1%></div></td>
????? <td> <div align="center"><%=name%></div></td>
????? <td><div align="center"><%=pass%></div></td>
????? </tr>
??? <%
??????? }
%>
? </table>
</body>
</html>
5.把module部署在tomcat的webapp下
5.1 在WEB-INF\lib\log4j-1.2.8.jar,mysql-connector-java-3.0.11-stable-bin.jar,oscache-2.3.2.jar,commons-logging.jar,jgroups-all.jar
5.2 在WEB-INF\classes拷貝cach\etc\下的oscache.tld,oscache.properties
5.3 只對/testCache.jsp緩存
修改WEB-INF\web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.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>com.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>
啟動tomcat,在mysql的person中增加一條記錄,發現已對/testCache.jsp頁面進行緩存,而/testCache2.jsp頁面未緩存,如去掉黑體,則數據表增加一行,testCache.jsp也隨之修改
5.4對所有的jsp緩存,
修改WEB-INF\web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
? <display-name>test</display-name>
????? <filter>???
??????? <filter-name>CacheFilter</filter-name>
??????? <filter-class>com.opensymphony.oscache.web.filter.CacheFilter</filter-class>
????????? <init-param>???????
?????????? <param-name>time</param-name>
??????????????????? <param-value>60</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>
其中60s,是失效時間,在mysql的person中增加一條記錄,發現已對/testCache.jsp,/testCache2.jsp頁面進行緩存,頁面不變化,60s后頁面變化.
posted on 2007-03-17 09:15
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