JSP + Tomcat 5.5 + SQL Server 2000 出错，始终找不到原因，帮忙看一下

数据库的连接文件 DBOper.java (说明一下：这个文件原来是连的Oracle数据库，但我电脑配置太低，怕跑不起来，换成SQL Server 2000了，相应的语句也改了，不知有没有错误？）：

package comm;

import java.sql.*;
import *;
import java.util.*;
import oracle.jdbc.*;  // 引用JDBC驱动包
import Information.*;

public class DBOper {
    private Connection conn = null;
    private Statement stmt = null;
    // 数据库连接
public void connectDB() throws Exception
{
String hostName      = "localhost";  // 主机名或者IP地址
        String portNumber    = "1433";//"1521";      // 端口号，默认为1521
        String databaseSID    = "oracledb";  // SID名称
//      String userName      = "devsys";    // 用户名
  //        String password      = "devsys";    // 用户密码
String userName      = "sa";    // 用户名
    String password      = "newsmanager";    // 用户密码

String url = "jdbc:microsoft:sqlserver://"+hostName+":"+portNumber+":"+databaseSID;
//String url = "jdbc:oracle:thin:@"+hostName+":"+portNumber+":"+databaseSID;  // 连接字符串
System.out.println(url);  // 打印连接字符串
try{
// 装载驱动程序
Class.forName("com.microsoft.JDBC.sqlserver.SQLServerDriver");
//Class.forName("oracle.jdbc.driver.OracleDriver");
// 建立连接
conn = DriverManager.getConnection(url,userName,password);
        }
        catch (Exception e){
// 如果有异常，则抛出错误
            System.out.println("=====Exception : DBOper connectDB() exception: " + e.getMessage());
        }
    }
// 获取数据库连接对象
public Connection getConnection() throws Exception
{
return conn;
}
// 执行查询，返回单一结果
    public ResultSet getResultSet(String sql) throws SQLException
    {
        try{
// 如果数据库没有连接，则连接数据库
if(conn==null)
connectDB();
        }
        catch (Exception e){
            throw new SQLException(e.getMessage());
        }
// 如果语句为空，则创建语句
if(stmt ==null)
        stmt =conn.createStatement();
// 执行查询，返回查询结果集
      return stmt.executeQuery(sql);
    }
// 添加、删除、更新操作
    public void DataUpdate(String sql) throws SQLException
    {
        try
        {
// 连接数据库
if(conn==null)
connectDB();
  // 创建语句
if(stmt ==null)
stmt =conn.createStatement();
  // 执行更新操作
          stmt.executeUpdate(sql);
        }
        catch (Exception e)
        {
            throw new SQLException(e.getMessage());
        }
}
    // 关闭
    public void close() throws SQLException
    {
// 设置自动提交
conn.setAutoCommit(true);
// 关闭语句，关闭连接
        if(stmt!=null) {stmt.close();stmt  =null;}
        if(conn!=null) {conn.close();conn  =null;}
    }
}

错误信息中提到的InfoComm.jsp文件中的问题语句：User cannot be resolved to a type中的User类的源文件User.java：

//系统用户类
package Information;

import java.util.*;
import *;
import java.sql.*;
import java.text.*;
import comm.*;


public class User {
private String UserId; // 用户名
private String EmplName; // 员工姓名
private String PassWord; // 密码
private int UserType; // 用户类型；1-经理；2- 管理员

StringOper so = new StringOper();

// 获得一个用户的信息，如果存在此用户返回true，否则false
    public boolean getUser()throws Exception
    {
        int conditionNo = 0;
        DBOper o_DBOper = new DBOper();
        ResultSet rs = null;

String sql = "Select * from Users";
String condition = " where ";
// 设置查询条件
if(UserId != null){
            condition += "UserId='"+UserId+"'";
            conditionNo++;
        }
        if(PassWord != null)
        {
            if(conditionNo > 0)
            {
                condition += " and";
            }
            condition += " PassWord='"+PassWord+"'";
            conditionNo++;
        }
if(conditionNo > 0)
        {
            sql += condition;
        }
System.out.println(sql);
        try
        {
// 执行查询操作
            rs = o_DBOper.getResultSet(sql);
            if(rs.next())
            {
setUserId(so.ReplaceNull(rs.getString("UserId")));
setEmplName(so.ReplaceNull(rs.getString("EmplName")));
setPassWord(so.ReplaceNull(rs.getString("PassWord")));
setUserType(rs.getInt("UserType"));
                return true;
            }
        }
        catch(Exception e)
        {
            throw new Exception(e.getMessage());
        }
    finally
    {
            try {o_DBOper.close();} catch (Exception e) { System.out.print(e.toString());}
    }
        return false;
    }

// 根据查询条件获得多个用户信息
public Vector getMoreUser() throws Exception
    {
        Vector v_User = new Vector();
        int conditionNo = 0;

        DBOper o_DBOper = new DBOper();
        ResultSet rs = null;

        String sql = "Select * from Users";
        String condition = " where ";
        try
        {
            if(UserId != null)
            {
                condition += " UserId='"+UserId+"'";
                conditionNo++;
            }
            if(EmplName != null)
            {
                if(conditionNo > 0)
                {
                    condition += " and ";
                }
                condition += " EmplName='"+EmplName+"'";
                conditionNo++;
            }
if(UserType != 0)
            {
                if(conditionNo > 0)
                {
                    condition += " and ";
                }
                condition += " UserType="+UserType;
                conditionNo++;
            }
            if(conditionNo > 0)
            {
                sql += condition;
            }
            sql += " order by UserId desc";

            rs = o_DBOper.getResultSet(sql);
//System.out.println(sql);
while(rs.next())
            {
                User o_User2 = new User();
o_User2.setUserId(so.ReplaceNull(rs.getString("UserId")));
o_User2.setEmplName(so.ReplaceNull(rs.getString("EmplName")));
o_User2.setPassWord(so.ReplaceNull(rs.getString("PassWord")));
o_User2.setUserType(rs.getInt("UserType"));
                v_User.add(o_User2);
            }
        }
        catch(Exception e)
        {
            throw new Exception(e.getMessage());
        }
    finally
    {
            try {o_DBOper.close();} catch (Exception e) { System.out.print(e.toString());}
    }
        return v_User;
    }


//删除用户信息，条件为指定用户名
public void DeleteUser(String UserId) throws Exception
    {
        DBOper o_DBOper = new DBOper();
ResultSet rs = null;

        String sql_dlt = "delete from Users where UserId ='" + UserId + "'";
        try
        {
            o_DBOper.getResultSet(sql_dlt);
        }
        catch(Exception e)
        {
            throw new Exception(e.getMessage());
        }
    finally
    {
            try {o_DBOper.close();} catch (Exception e) { System.out.print(e.toString());}
    }
    }
//插入用户，密码缺省为6个1
public void CreateUser() throws Exception
    {
        DBOper o_DBOper = new DBOper();
        ResultSet rs = null;

        String sql = "Insert into Users(UserId,EmplName,UserType,PassWord) ";
sql =sql+"values('"+UserId+"','"+EmplName+"',"+UserType+",'111111')";
//System.out.println("INSERT SQL:"+sql);
        try
        {
            o_DBOper.getResultSet(sql);
        }
        catch(Exception e)
        {
            throw new Exception(e.getMessage());
        }
    finally
    {
            try {o_DBOper.close();} catch (Exception e) { System.out.print(e.toString());}
    }
    }
// 更新用户信息,用于管理员更改用户信息，不更改密码
public void UpdateUser() throws Exception
    {
        DBOper o_DBOper = new DBOper();
        ResultSet rs = null;

        String sql = "Update Users set EmplName='"+EmplName+"',UserType="+UserType;
sql = sql+" where UserId='"+UserId+"'";
// System.out.println("UPDATE SQL :"+sql);
        try
        {
            o_DBOper.getResultSet(sql);
        }
        catch(Exception e)
        {
            throw new Exception(e.getMessage());
        }
    finally
    {
            try {o_DBOper.close();} catch (Exception e) { System.out.print(e.toString());}
    }
    }
// 用户更改自己密码和管理员密码重置为六个1
public void UpdatePassWord() throws Exception
    {
        DBOper o_DBOper = new DBOper();
        ResultSet rs = null;

        String sql = "Update Users set PassWord='"+PassWord+"' where UserId='"+UserId+"'";
        try
        {
            o_DBOper.getResultSet(sql);
        }
        catch(Exception e)
        {
            throw new Exception(e.getMessage());
        }
    finally
    {
            try {o_DBOper.close();} catch (Exception e) { System.out.print(e.toString());}
    }
    }
// 设置、获得用户的信息
public void setUserId(String UserId){
        this.UserId = UserId;
    }
    public String getUserId(){
        return this.UserId;
    }
public void setEmplName(String EmplName){
        this.EmplName = EmplName;
    }
    public String getEmplName(){
        return this.EmplName;
    }
public void setPassWord(String PassWord){
        this.PassWord = PassWord;
    }
    public String getPassWord(){
        return this.PassWord;
    }

public void setUserType(int UserType){
        this.UserType = UserType;
    }
    public int getUserType(){
        return this.UserType;
    }
}


谁知道是哪个地方有问题吗？？？？？？？？

我都快绝望了 ！！

classes文件夹中包括comm和 Information文件夹，这两个文件夹中放着java文件）和images（里面是图片）。 ，问题就是在这里，classes中应该放的是相对应的class文件，而不是.java 文件，先使用javac将其编译一下，然后拷贝至classes目录，应该就OK了。