stulogin.java~2~

来自「自己写的学生选课系统,多多关照.以后共同学习」· JAVA~2~ 代码 · 共 44 行

package student;

import javax.swing.JOptionPane;
import java.awt.event.ActionEvent;

public class StuLogin extends SuperLogin {
    public StuLogin() {
        this.jLabel1.setText("学号：");
        this.jLabel2.setText("密码:");
    }

    public void jButton1_actionPerformed(ActionEvent e) {

        if (jTextFieldName.getText().trim().equals("")) {
            JOptionPane.showMessageDialog(this, "用户名不能为空！");
        }
        //检查密码是否为空
        if (jPasswordFieldPsw.getText().trim().equals("")) {
            JOptionPane.showMessageDialog(this, "用户名密码不能为空！");
        }

        String sql = "select * from Student where Sno = '" +
                     jTextFieldName.getText().trim() + "'and Spsw = '" +
                     jPasswordFieldPsw.getText().trim() + "'";
        boolean isexist = false;
        rs = DBManager.getResult(sql);

        try {

            //next 方法将光标移动到下一行，如果返回为true 说明存在相应的用户
            isexist = rs.next();
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(this, "ERROR");
        }
        if (!isexist) { //如果不存在，则弹出登陆失败
            JOptionPane.showMessageDialog(this, "登陆失败！");
        } else { //如果存在，则弹出登陆成功 并设置相应的操作功能
            JOptionPane.showMessageDialog(this, "登陆成功！");
            String str = "欢迎" + jTextFieldName.getText().trim()+"同学的登陆";
                MainFrame.jLabelWelcome.setText(str);
        }
    }
}