用户登录界面
package Student_Manage_System;import java.awt.FlowLayout;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JPasswordField;import javax.swing.JTextField;//用户登录界面public class UserLogin {JTextField name=new JTextField(10);JPasswordField pwd=new JPasswordField(10);//用户登录界面初始化public void Init() throws Exception{JFrame f=new JFrame();FlowLayout layout = new FlowLayout(FlowLayout.RIGHT,135,50);JPanel p=new JPanel(layout);JLabel label_name=new JLabel();JLabel label_pwd = new JLabel();JButton btn1=new JButton("登录");JButton btn2=new JButton("注册");JButton btn3=new JButton("取消");label_name.setText("用户名");//设置标签内容label_pwd.setText("密码");//创建MyClick1内部类，绑定到登录按钮;MyClick1 mc1=new MyClick1();btn1.addMouseListener(mc1);//创建MyClick2内部类，绑定到注册按钮;MyClick2 mc2=new MyClick2();btn2.addMouseListener(mc2);//创建MyClick3内部类，绑定到退出按钮;MyClick3 mc3=new MyClick3();btn3.addMouseListener(mc3);//将标签，文本域，按钮等添加到面板p.add(label_name);p.add(name);p.add(label_pwd);p.add(pwd);p.add(btn1);p.add(btn2);p.add(btn3);f.add(p);//将面板添加到窗体f.setVisible(true);//设置窗体可见f.setSize(600,450);f.setLocation(650, 350);f.setTitle("登录界面");f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭窗体}//登录按钮的事件监听public class MyClick1 extends MouseAdapter{public void mouseClicked(MouseEvent e) {//登录，数据库中有表格，判断是否登录成功！；//注册：即插入数据。//获取登录的账号和密码String username=name.getText();String userpwd=pwd.getText();//在数据库中进行查找，如果查找成功，账号和密码正确；//获取数据库的连接try {Connection con=DBUtil.getCon("studentdb");//预编译SQL语句//这里需要判断是学生登录还是老师登录String sql="select * from login_info where ID=? and Pwd=? and Job=?";//执行SQL语句//教师登录，跳转教师界面；PreparedStatement prep1=con.prepareStatement(sql);prep1.setString(1, username);//用户名prep1.setString(2, userpwd);//密码prep1.setString(3, "teacher");//工作是teacherResultSet is_teacher=prep1.executeQuery();//学生登录，跳转学生界面；PreparedStatement prep2=con.prepareStatement(sql);prep2.setString(1, username);prep2.setString(2, userpwd);prep2.setString(3, "student");//工作是studentResultSet is_student=prep2.executeQuery();if(is_teacher.next())//管理员登录{ //跳转管理员界面System.out.println("老师你好，登录成功！");JOptionPane.showMessageDialog(null, "老师您好，登录成功！");Teacher tea=new Teacher();tea.init();//DBUtil.notice("老师你好，登录成功！");}else if(is_student.next())//学生登录{//跳转学生界面System.out.println("学生你好，登录成功！");JOptionPane.showMessageDialog(null, "登录成功！");Students stu=new Students();stu.init();//DBUtil.notice("学生你好，登录成功！");}else{System.out.println("登录失败！");JOptionPane.showMessageDialog(null, "登录失败！");}con.close();} catch (Exception e1) {e1.printStackTrace();}}}//注册按钮的事件监听public class MyClick2 extends MouseAdapter{public void mouseClicked(MouseEvent e) {//System.out.print("注册成功");//跳转进入注册界面try {//DBUtil.notice("注册成功!");Register r=new Register();r.init();} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}//退出按钮的事件监听public class MyClick3 extends MouseAdapter{public void mouseClicked(MouseEvent e) {//System.out.print(" 退出成功");//结束程序try {JOptionPane.showMessageDialog(null, "退出成功!");System.exit(0);//结束} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}//启动注册界面public static void main(String[] args) throws Exception {UserLogin login=new UserLogin();login.Init();}}
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