数据库应用-java+sqlserver（四）Logon

Logon:

import java.awt.Font;
import java.awt.Label;
import java.sql.*;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

class Logon extends JPanel 
{
    JTextField t1;
    JPasswordField t2;
    JButton button1,button2;
    static String info[];
    static String userid,password;
    Logon()
    {
        JLabel label=new JLabel("登陆");
        label.setFont(new Font("TimesRoman",Font.BOLD,24));
        t1=new JTextField(20);
        t2=new JPasswordField(20);
        button1=new JButton("登陆");
        button2=new JButton("取消");
        JPanel p1,p2,p3,p4;
        Box box=Box.createVerticalBox();
        p1=new JPanel();//p1.setBackground(Color.PINK);
        p2=new JPanel();
        p3=new JPanel();
        p4=new JPanel();
        p1.add(label);
        p2.add(new Label("用户名:"));
        p2.add(t1);
        p3.add(new Label("口    令:"));
        p3.add(t2);
        p4.add(button1);
        p4.add(button2);    
        box.add(p1);
        box.add(p2);
        box.add(p3);
        box.add(p4);
        add(box);
    }
    public char logon() throws SQLException
    {
        String tuserid=t1.getText();
        String tpassword=new String(t2.getPassword());
        String sql1=null,sql2=null;
        ResultSet rs=null;
        SqlManager DBm=SqlManager.createInstance();//单态模式获取实例
        DBm.connectDB();
        sql1="exec ProcLogon'"+tuserid+"','"+tpassword+"'";
        rs=DBm.executeQuery(sql1);
        
        if(rs.next())//如果存储过程有结果返回，则将用户信息读入并保存
        {
            System.out.println(rs.getString(1)+"如果存储过程有结果返回，则将用户信息读入并保存");
            userid=rs.getString(1);
            password=rs.getString(2);
            if(userid.startsWith("T"))
            {
                TeaInfo.saveTea(userid);
                
            }
            else if(userid.startsWith("S"))
            {
                StuInfo.saveStu(userid);
            }
            else if(userid.startsWith("A"))
            {
                sql2=sql1;
                DBm.connectDB();
                rs=DBm.executeQuery(sql2);
            }
            rs.close();
            DBm.closeDB();
            return userid.substring(0, 1).toCharArray()[0];
        }
        else{
            userid=null;
            password=null;
            JOptionPane.showMessageDialog(this,"用户名或密码错误,请重新填写",
                    "警告",JOptionPane.WARNING_MESSAGE);
            rs.close();
            DBm.closeDB();
            return '0';
        }
    }
    private static void dispResultSet(ResultSet rs) throws SQLException
    {
        ResultSetMetaData rsmd=rs.getMetaData();
        int numCols=rsmd.getColumnCount();
        info=new String[numCols];
        while(rs.next())
        {
            for(int i=1;i<=numCols;i++)
            {               
                info[i-1]=rs.getString(i);
                if(i>1)System.out.print(",");
                System.out.print(rs.getString(i));
            }
            System.out.println("");
        }
    }
    public void reset()
    {
        t1.setText(null);
        t2.setText(null);
        t1.requestFocusInWindow();
    }
}