login.java~86~

java语言写的

package scoremis;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
import com.borland.internetbeans.*;

public class login extends JFrame {//构造各组件
  JPanel contentPane;
 JLabel jLabel1=new JLabel("用户名");
 JTextField uname=new JTextField();
 JLabel jLabel2=new JLabel("密码");
 JPasswordField upsd=new JPasswordField();
 JButton submit=new JButton("登录");
 JButton cancel=new JButton("取消");
 JLabel jLabel3=new JLabel("学生成绩管理系统");
 JLabel jLabel4=new JLabel("身份");
 JComboBox identity=new JComboBox();
 public login(){
  try{
    setDefaultCloseOperation(EXIT_ON_CLOSE);
  jbInit();
    }catch (Exception exception){exception.printStackTrace();}
  }
private void jbInit() throws Exception{//组件初始化
    contentPane=(JPanel) getContentPane();
    contentPane.setLayout(null);
    setSize(new Dimension(280,320));//设置尺寸大小
    setResizable(false);//设置是否可以改变大小
    setTitle("学生成绩管理系统");//设置标题
    jLabel1.setFont(new java.awt.Font("Dialog", 0, 12));
    jLabel1.setBounds(new Rectangle(49, 69, 66, 32));//设置各组件的初始位置
    uname.setFont(new java.awt.Font("Dialog", 0, 12));
    uname.setBounds(new Rectangle(122,77,102,27));
    jLabel2.setFont(new java.awt.Font("Dialog", 0, 12));
    jLabel2.setText("密    码");
    jLabel2.setBounds(new Rectangle(49,128,45,31));
    upsd.setFont(new java.awt.Font("Dialog", 0, 12));
    upsd.setBounds(new Rectangle(122,130,102,28));
    submit.setBounds(new Rectangle(49,240,69,27));
    cancel.setBounds(new Rectangle(160,240,64,27));
    jLabel3.setFont(new java.awt.Font("Dialog", 1, 22));
    jLabel3.setBounds(new Rectangle(50, 15, 201, 41));
    jLabel4.setFont(new java.awt.Font("Dialog", 0, 12));
    jLabel4.setRequestFocusEnabled(true);
    jLabel4.setToolTipText("");
    jLabel4.setText("身    份");
    jLabel4.setBounds(new Rectangle(49,182,55,26));
    identity.setFont(new java.awt.Font("Dialog", 0, 12));
    identity.setBounds(new Rectangle(122,179,102,30));
    identity.addItem(new String("学生"));//给下拉列表框添加各项目
    identity.addItem(new String("教师"));
    identity.addItem(new String("管理员"));
    contentPane.add(jLabel1); contentPane.add(uname);//添加各组件
    contentPane.add(jLabel2);contentPane.add(upsd);
    contentPane.add(submit); contentPane.add(cancel);
    contentPane.add(jLabel4);contentPane.add(identity);
    contentPane.add(jLabel3);
    submit.addActionListener(new yanzheng());//给各按钮添加监视器
    cancel.addActionListener(new yanzheng());
    submit.setFont(new java.awt.Font("Dialog", 0, 12));
    cancel.setFont(new java.awt.Font("Dialog", 0, 12));
    };
    class yanzheng implements ActionListener{ //事件处理类
      public void actionPerformed(ActionEvent e){
        if(e.getSource()==submit){ //处理“登录”事件
          String xm=uname.getText();
          String mm=new String(upsd.getPassword());
          String sf=(String)identity.getSelectedItem();
          dbconn db=new dbconn();
          ResultSet rs=null;
          String sql="";
          boolean login=false;
          if(sf.equals("学生"))    //根据不同身份进行不同表的查询
            sql="select * from student where name='"+xm+"' and id='"+mm+"'";
          else if(sf.equals("管理员"))
            sql="select * from teacher where name='"+xm+"' and psd='"+mm+"' and isadmin=true ";
          else if(sf.equals("教师"))
            sql="select * from teacher where name='"+xm+"' and psd='"+mm+"'";
            try{
              rs=db.Query(sql);
              if(rs.next()){
                login=true;
              }else{
                JOptionPane.showMessageDialog(null,"用户名或密码错误，请重新输入!");
                uname.setText("");upsd.setText("");  //清空用户名 密码 文本框
                uname.requestFocus(true);//cancel.transferFocus();焦点→用户名文本框
              }
            if(login==true){
              if(sf.equals("学生")){               //以”学生“身份登录
                MainUI mui=new MainUI(xm,mm,sf);  //调用主窗体
                mui.scopy.setEnabled(false);      //系统备份
                mui.sback.setEnabled(false);      //系统恢复
                mui.sdayadmin.setEnabled(false);  //日常管理
                mui.ptec.setEnabled(false);       //教师管理
                mui.cou.setEnabled(false);        //课程管理
                mui.sinput.setEnabled(false);     //成绩录入
                mui.inputc.setEnabled(false);     //任课登录
                mui.clogin.setEnabled(false);     //课程注册
                mui.sedit.setEnabled(false);      //成绩修改
                setVisible(false);                //隐藏登录窗体
                mui.setVisible(true);             //显示菜单
              }
              else if(sf.equals("管理员")){    //以”管理员“身份登录
               MainUI admin=new MainUI(xm,mm,sf);
               admin.sedit.setEnabled(false);
               admin.sinput.setEnabled(false);
               setVisible(false);
               admin.setVisible(true);
             }
             else if(sf.equals("教师")){   //以”教师“身份登录
              rs=db.Query("select * from quanxian");
              if(rs.next()){
                MainUI teac=new MainUI(xm,mm,sf);
                teac.scopy.setEnabled(false);
                teac.sback.setEnabled(false);
                teac.sdayadmin.setEnabled(false);
                teac.cou.setEnabled(false);
                teac.ptec.setEnabled(false);
                teac.sinput.setEnabled(rs.getBoolean(1));
                teac.sedit.setEnabled(rs.getBoolean(2));
                teac.pstu.setEnabled(rs.getBoolean(3));
                setVisible(false);
                teac.setVisible(true); }
             }
            }
         }catch(Exception er){
           System.out.println(er.toString());
         }
        }else if(e.getSource()==cancel){   //处理退出
          System.exit(0);
        }
      }
    }
}