----Loginwindow of Students ' course selection system

/** * @author Li Pei * * @version v1 * * @time 2016/12/1 15:37 * * @program Create a teacher class for the corresponding data table entity to facilitate DAO's connection to the database * */package com.csms . windows;//import the package to be used import Java.awt.font;import java.awt.event.actionevent;import java.awt.event.ActionListener; Import Com.csms.dao.*;import javax.swing.*;//student elective System login interface public class Loginwindow {JFrame frame = new JFrame ();//Window size PRI vate static final int windowswide = 400;private static final int windowshigh = 200;//determines the selection of RadioButton: 1 for Administrators, 2 for students, 3 for teachers private static int flag = 0;//defines user name input box and Password box component variable final JTextField usertext;final jpasswordfield pswtext;//set password label and user name label JLA Bel Psdlabel; JLabel textlabel;//radio button component variable Jradiobutton radiobutton;//user login variable, through these two variables, in the student interface, the teacher interface to get the login username and password private static String Loginusername;private Static String loginpassword;//creates a radio button group Buttongroup buttgroup = new Buttongroup (); JPanel Southpanel = new JPanel ();//Set the logo tag of the login screen icon icon = new ImageIcon ("Src//images//icons//loginicon.png");p ublic Loginwindow () {//1. Set label label for Login box of Hunan Polytechnic Institute logo label JlabeL label = new JLabel (icon), Label.setbounds (0, 260, max), Frame.add (label),//2. Set the position of the text label and text box//user name tag and user name login box, and set them up in a good location , add into panel Publicwindowset.addlabel (frame, 16, 65, 70, 90, 30, "username:"); usertext = new JTextField (); Publicwindowset.addtextfield (Usertext, N, +, +, +, frame);//password tags and password login boxes, and set them up in position, Add into panel Publicwindowset.addlabel (frame, 16, 65, 105, 90, 30, "Password:");p Swtext = new JPasswordField (); Publicwindowset.addtextfield (Pswtext, N, Max, Max, +, frame);//3. Set radio button//Create radio button This.addradiobutton ("admin", 1, False ); This.addradiobutton ("Student", 2, false); This.addradiobutton ("Teacher", 3, False); Southpanel.setbounds (60, 140, 200, 30); Frame.add (Southpanel);//4. Create Login button This.addbutton ("Login", frame);//5. Set window-related properties, The Windowattribute function is a window property set function that encapsulates the Publicwindowset class//Settings window title Publicwindowset.windowattribute (frame, windowswide, Windowshigh, NULL, "Hunan Polytechnic College Student selection system");  Set radio button Listener and add radio button private void AddRadioButton (String name, int flag, Boolean bool) {RadioButton = new Jradiobutton (name, BOOL);//Set radio button transparent RadiobutTon.setcontentareafilled (false);//Set radio button font and font related properties Radiobutton.setfont (new Font ("Italic", Font.plain, 12)); Radiobutton.addactionlistener (new ActionListener () {public void actionperformed (ActionEvent e) {Loginwindow.setflag ( flag);}); Buttgroup.add (RadioButton); Southpanel.add (RadioButton);} Add the login confirmation and Cancel button and also set the button listener private void AddButton (String buttonname, JFrame jfr) {JButton button = new JButton (buttonname); b Utton.setbounds (260, Button.addactionlistener, Max), Button.setfont (New Font ("Italic", Font.plain,)); ActionListener () {public void actionperformed (ActionEvent event) {try {///Execute login//Set user name and password, save Loginusername = Usertext.gettext (); Loginpassword = Pswtext.gettext (); Loginwindow.setloginusername (Loginusername); Loginwindow.setloginpassword (Loginpassword); if (loginwindow.getflag () = = 1) {//1. The Administrator//determines whether the contents of the input box are empty, The code in this can also continue to encapsulate if (loginusername.length () = = 0 | | loginpassword.length () = = 0) {// The Promptpopup method is to encapsulate the publicwindowset in the prompt box to display the function publicwindowset.promptpopup ("Enter user name and password!", "Login Prompt", JFR);} Determine if the password and user name you entered are correct else if (new Adminitartordao (). Loginconfirm (Loginusername, Loginpassword)) { Publicwindowset.promptpopup ("Login Successful!!!", "Login Prompt", JFR); new Admintratorwindow (); Jfr.dispose ();} else {publicwindowset.promptpopup ("username or password is wrong, please reenter!!!", "Login Prompt", JFR);}} else if (loginwindow.getflag () = = 2) {//2. Student//Determine if the contents of the input box are empty if (loginusername.length () = = 0 | | loginpassword.length () = = 0 {Publicwindowset.promptpopup ("Please enter user name and password!", "Login Prompt", JFR);} Verify the identity and determine whether the correct user name and password else if (new Studentdao (). Loginconfirm (Loginusername, Loginpassword)) { Publicwindowset.promptpopup ("Login Successful!!!", "Login Prompt", JFR); Studentwindow SW = new Studentwindow (), Sw.setsize (Sw.getwindowwide (), Sw.getwindowhigh ());//Release Login window Jfr.dispose ();} else {publicwindowset.promptpopup ("username or password is wrong, please reenter!!!", "Login Prompt", JFR);}} else if (loginwindow.getflag () = = 3) {//3. Teacher//Determine if the contents of the input box are empty if (loginusername.length () = = 0 | | loginpassword.length () = = 0 {Publicwindowset.promptpopup ("Please enter user name and password!", "Login Prompt", JFR);} Verify the identity and determine whether the correct user name and password else if (new Teacherdao (). LOginconfirm (Loginusername, Loginpassword)) {publicwindowset.promptpopup ("Login Successful!!!", "Login Prompt", JFR); New Teacherwindows ( ); Jfr.dispose ();} else {publicwindowset.promptpopup ("username or password is wrong, please reenter!!!", "Login Prompt", JFR);}} else {publicwindowset.promptpopup ("Please select your identity: Student, teacher, Administrator!", "Login Prompt", JFR);}} catch (Exception e) {e.printstacktrace ();}}}); Jfr.add (button);} Gets the flag identifier private static int Getflag () {return flag;} Set flag identity private static void Setflag (int flag) {Loginwindow.flag = flag;} Gets the login user name public static String Getloginusername () {return loginusername;} Set logon user name public static void Setloginusername (String loginusername) {loginwindow.loginusername = Loginusername;} Gets the login user name public static String Getloginpassword () {return loginpassword;} Set logon user name public static void Setloginpassword (String loginpassword) {Loginwindow.loginpassword = Loginpassword;}}

　　

----Loginwindow of Students ' course selection system