各位高手麻烦帮我看下面这三个文件(一个jsp,两个.java),我在IE输入地址时,提示如下错误(代码应该没有错,不知是不是设置的问题),望高手指教,不胜感激:

D:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\_\shopping\index_jsp.java:44: package mybean does not exist mybean.DBConnManager connManager = null; ^An error occurred at line: 2 in the jsp file: /shopping/index.jspGenerated servlet error:D:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\_\shopping\index_jsp.java:46: package mybean does not exist connManager = (mybean.DBConnManager) pageContext.getAttribute("connManager", PageContext.APPLICATION_SCOPE); ^An error occurred at line: 2 in the jsp file: /shopping/index.jspGenerated servlet error:D:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\_\shopping\index_jsp.java:49: package mybean does not exist connManager = (mybean.DBConnManager) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "mybean.DBConnManager"); ^

//下面这两个是连接池,下面两个文件都放在一个mybean的包里.

package mybean;import java.sql.*;import java.util.*;

public class DBConnPool { //正在使用连接的数量 private int using; //目前可用的连接数,即空闲连接 private Vector connections=new Vector(); //最大连接数 private int maxconn; //连接池名 private String poolname; //数据库标识 private String dbid; //驱动程序名 private String drivername; //数据库帐号 private String username; //数据库密码 private String passwd;

public DBConnPool(String poolname,String dbid,String drivername, String username,String passwd,int maxconn){ this.poolname=poolname; this.drivername=drivername; this.dbid =dbid; this.username =username; this.passwd=passwd; this.maxconn=maxconn; }

/*将空闲连接返回给连接池*/ public synchronized void returnConnection(Connection conn){ //将指定连接加到向量末尾 connections.addElement(conn); //连接用户减一 using--; }

/*从连接池得到一个连接*/ public synchronized Connection getConnection(){ Connection conn = null; //Connection是一个类, //connections是一个向量,用于存储连接对象,它所存储是的所有空闲状态的可用连接 if (connections.size() > 0) {

//获取连接列表的第一个连接 conn = (Connection) connections.elementAt(0); connections.removeElementAt(0);//获得一个连接,并将此连接从队列中删除.

//如果此连接已关闭,刚继续获取, try { if (conn.isClosed()) conn = getConnection(); } catch (Exception e) { e.printStackTrace(); } } //如果实际使用的连接数小于最大连接数即有可用连接),就新增加一个连接 else if (maxconn == 0 || using < maxconn){ //如此时无可用连接(maxconn == 0)且连接数又未达到上限(using < maxconn)),就创建一个新连接 conn=newConnection(); } //如果连接数已达到上限就返回空指针 if (conn!=null){ using++; } return conn; }

/*创建新的连接*/ public Connection newConnection(){ Connection conn=null; try{ //加载驱动 Class.forName(drivername); conn=DriverManager.getConnection(dbid,username,passwd); }catch(Exception e){ e.printStackTrace(); return null; } return conn; }

/*关闭所有连接*/ public synchronized void closeConn(){ Enumeration allConnections=connections.elements(); while (allConnections.hasMoreElements()){ Connection conn=(Connection) allConnections.nextElement(); try{ conn.close(); }catch(SQLException e){ e.printStackTrace(); } } connections.removeAllElements(); }}

package mybean;import java.sql.*;import java.util.*;

public class DBConnManager { //连接池名列表 private Vector poolnames =new Vector(); //驱动程序名列表 private Vector drivernames=new Vector(); //数据库标识列表 private Vector dbids=new Vector(); //用户名列表 private Vector usernames=new Vector(); //用户密码列表 private Vector passwds=new Vector(); //最大连接数列表 private Vector maxconns=new Vector(); //连接池队列 private Hashtable connPools=new Hashtable();

public DBConnManager() { //添加Access数据库的连接信息 poolnames.addElement("access"); drivernames.addElement("sun.jdbc.odbc.JdbcOdbcDriver"); dbids.addElement("jdbc:odbc:shopping"); usernames.addElement(""); passwds.addElement(""); maxconns.addElement("5");

//添加SQL Server2000数据库的连接信息 poolnames.addElement("sqlserver2000"); drivernames.addElement("com.microsoft.jdbc.sqlserver.SQLServerDriver"); dbids.addElement("jdbc:microsoft:sqlserver://localhost:1433;DatabserName=shopping"); usernames.addElement(""); passwds.addElement(""); maxconns.addElement("5");

//连接Mysql数据库信息 poolnames.addElement("mysql"); drivernames.addElement("org.gjt.mm.mysql.Driver"); dbids.addElement("jdbc:mysql://localhost/shopping"); usernames.addElement(""); passwds.addElement(""); maxconns.addElement("5");

//连接Oracle8i/9i数据库 poolnames.addElement("oracle"); drivernames.addElement("oracle.jdbc.driver.OracleDriver"); dbids.addElement("jdbc:oracle:thin:@localhost:1521:shopping"); usernames.addElement(""); passwds.addElement(""); maxconns.addElement("5");

//创建连接池 createPools(); }

/*将连接返回给由指定的连接池*/ public void returnConnection(String name,Connection conn){ DBConnPool pool=(DBConnPool) connPools.get(name); if (pool!=null) { pool.returnConnection(conn); } }

/*得到一个指定连接池中的连接*/ public Connection getConnection(String name){ DBConnPool pool=(DBConnPool) connPools.get(name); if (pool!=null) { return pool.getConnection(); } return null; }

/*关闭所有连接*/ public synchronized void closeConns(){ Enumeration allPools=connPools.elements(); while (allPools.hasMoreElements()){ DBConnPool pool=(DBConnPool) allPools.nextElement(); pool.closeConn(); } }

/*创建连接池*/ private void createPools(){ for (int i=0;i下面这个是主页面.JSP文件

<%@ page contentType="text/html; charset=GBK" %><%@ page import ="java.sql.*" %>

<%String sql="select * from userinfo";ResultSet rs=stmtS.executeQuery(sql);while (rs.next()){%>