【求助】数据库连接问题，登录界面不能实现？？？（有源码）

package zxl;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

import java.sql.*;

public class Enter implements ActionListener
{
    JTextField user;
    JPasswordField passWd;
    Container contentPane;
    JButton b1,b2;
    JPanel pan1,pan2,pan3,pan4;
    JFrame bms;
    JDialog dialog;
    JLabel label;
    Connection conn;
    Statement stmt;
    ResultSet rs;
    String str1,str2,name,passwd,sql;
   
    public Enter(JFrame bms)
  {
    dialog=new JDialog(bms,"登陆",true);
    contentPane=dialog.getContentPane();
    pan1=new JPanel();
    pan2=new JPanel();
    pan3=new JPanel();
    pan4=new JPanel();
    pan1.add(new JLabel("用户",SwingConstants.CENTER));
    user=new JTextField("",10);
    pan1.add(user);
    pan2.add(new JLabel("密码",SwingConstants.CENTER));
    passWd=new JPasswordField("",10);
    pan2.add(passWd);
    b1=new JButton ("确定");
    b2=new JButton ("取消");
    pan3.add(b1);
    pan3.add(b2);
    label=new JLabel();
    pan4.add(label);
    b1.addActionListener(this);
    b2.addActionListener(this);
    contentPane.setLayout(new GridLayout(4,1));
    contentPane.add(pan1);
    contentPane.add(pan2);
    contentPane.add(pan3);
    contentPane.add(pan4);
    dialog.setBounds(200,150,250,150);
    dialog.show();   
  }
  
      public void actionPerformed(ActionEvent e)
  {
           name=user.getText();
           passwd=passWd.getText();
           label.setText("用户名："+name+"  密码:"+passwd);
           //System.out.println(name+passwd);
          if(e.getActionCommand().equals("确定"))
        {
            sql="select * from USER where NAME='";
            sql+=name+"' and PASSWORD='";
            sql+=passwd+"'";
            System.out.println(sql);
            conn=ConnectDB2.getConnection();
            rs=ConnectDB2.getResultSet(sql);
            if(name.equals("")||passwd.equals(""))
               {
                JOptionPane.showMessageDialog(dialog, "用户名和密码不能为空！");
               }
            try
           {
                while(rs.next())
             {
                str1=rs.getString(1);
                str2=rs.getString(2);
                System.out.println(str1);
                
                if(name.equals(str1))
                  {
                        System.out.println(str2);
                        JOptionPane.showMessageDialog(dialog, "登陆成功");
                  }                
             }           }
           catch(Exception ec)
           {
   
           }
          ConnectDB2.disConnection(conn);
          
        }
        if(e.getActionCommand().equals("取消"))
        {
            System.exit(0);
        }
  }
}
我编译之后，上面标注的那段不能实现！
不知道为什么弹不出登录窗口。
请高手看看！
----------------解决方案--------------------------------------------------------
你的ConnectDB2文件呢？
----------------解决方案--------------------------------------------------------
if(name.equals(str1))

这句

看看你的name跟str1可equals的起来！！！

最好用：if(name.trim().equals(str1.trim()))

从数据库取出的字符串字段未必跟你的name的长度一样

可以用输出name.length()和str1.length()比较一下
----------------解决方案--------------------------------------------------------
调试跟进一下拉
----------------解决方案--------------------------------------------------------