用CashFilter实现页面级缓存实践
1.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.
2.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://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
* 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();
}
}
}
3.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;
}
