Question

我有一个java类，它充当登录页面并与微软访问连接，工作正常。我的问题是，我试图使用相同的功能，但在JSP页面上，有关如何做到这一点的任何想法？尝试了一些事情，没有任何作用。

我当前连接到数据库的login.java背后的代码如下：

package com;

import javax.swing.*;
import java.awt.event.*;
import java.sql.*;
import java.applet.*;






public class login extends Applet {

    Connection con;
    Statement st;
    ResultSet rs;

    JFrame f = new JFrame("User Login");
    JLabel l = new JLabel("Username:");
    JLabel l1 = new JLabel("Password:");
    JTextField t = new JTextField(10);
    JTextField t1 = new JTextField(10);
    JButton b = new JButton("login");



    public login(){
        connect();
        frame();
    }


    public void connect()
    {

        try{


        String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
        Class.forName(driver);

        String db = "jdbc:odbc:AngelsAndDemons";
        con = DriverManager.getConnection(db);
        st = con.createStatement();
        }
        catch(Exception ex)
        {
    }
}

    private void frame()
    {
       f.setSize(600,400);
       f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       f.setVisible(true);

       JPanel p = new JPanel();
       p.add(l);
       p.add(t);
       p.add(l1);
       p.add(t1);
       p.add(b);

       f.add(p);

       b.addActionListener(new ActionListener(){
           public void actionPerformed(ActionEvent e)
           {
 try{


               String user = t.getText().trim();
               String pass = t1.getText().trim();

               String sql = "select user,pass from AngelsAndDemons where user = '"+user+"'and pass = '"+pass+"'";
               rs = st.executeQuery(sql);

               int count = 0;
               while(rs.next())
               {
                   count = count + 1;
               }

           if(count == 1)
           {
               JOptionPane.showMessageDialog(null,"User found, Access Granted!");

           }
           else if(count > 1){
                JOptionPane.showMessageDialog(null,"Duplicte User, Access Denied");
           }
           else{
                JOptionPane.showMessageDialog(null,"User not found");
           }


           }
           catch(Exception ex)
           {
           }
           try{


               String user = t.getText().trim();
               String pass = t1.getText().trim();

               String sql = "select user,pass from AngelsAndDemons where user = '"+user+"'and pass = '"+pass+"'";
               rs = st.executeQuery(sql);

               int count = 0;
               while(rs.next())
               {
                   count = count + 1;
               }

           if(count == 1)
           {
               JOptionPane.showMessageDialog(null,"User found, Access Granted!");

           }
           else if(count > 1){
                JOptionPane.showMessageDialog(null,"Duplicte User, Access Denied");
           }
           else{
                JOptionPane.showMessageDialog(null,"User not found");
           }


           }
           catch(Exception ex)
           {
           }

           }


    });



    }

    public static void main(String[] args){
        new login();

    }

}//END CLASS

Answer 1

JSP有一个简单的语法来连接和检索数据库中的数据，你可以尝试

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>    
<sql:setDataSource var="tableImage" driver="sun.jdbc.odbc.JdbcOdbcDriver"
     url="jdbc:mysql://localhost/database"
     user="userName"  password="userPassword"/>
<sql:query dataSource="${tableImage}" var="queryResult">
SELECT * from Table;
</sql:query>

最后打印线

<c:forEach var="oneRow" items="${queryResult.rows}">
<c:out value="${oneRow.column}"/>

Java JSP Microsoft Access连接

1 个答案: