java简单的用户登录界面,Java制作一个用户登录的窗口

java简单的用户登录界面,Java制作一个用户登录的窗口详细介绍

本文目录一览： java用户登录界面的设计(java用户登录界面设计代码)

importjavax.swing.*;
importjava.awt.*;
publicclassFrameextendsJFrame{
publicstaticvoidmain(String[]args){
newFrame();
}
publicFrame()throws{
Container=this.();
JPanelheaderPanel=newJPanel();
headerPanel.setLayout(newFlowLayout());
headerPanel.add(newJLabel("欢迎进入学生成绩管理系统"));
JPanelcenterPanel=newJPanel();
centerPanel.setLayout(newGridLayout(2,2));
centerPanel.add(newJLabel("用户名",JLabel.CENTER));
centerPanel.add(newJTextField());
centerPanel.add(newJLabel("密码",JLabel.CENTER));
centerPanel.add(newJTextField());
JPanelfooterPanel=newJPanel();
footerPanel.setLayout(newFlowLayout());
footerPanel.add(newJButton("登录"));
footerPanel.add(newJButton("取消"));
.add(headerPanel,.NORTH);
.add(centerPanel,.CENTER);
.add(footerPanel,.SOUTH);
this.setTitle("Login");
this.setBounds(0,0,300,200);
this.(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
}

Java制作一个用户登录的窗口

Java用户登陆这块，主要还是类：
1，边界布局：BorderLayout。他主要分为五个布局，是JFrame(顶层容器)，JDialog(创建对话框窗口的类)的默认布局方式。其最多容量为5个组件，超出5个得用其他的。设置方式为：BorderLayout.NORTH;BorderLayout.SOUTH;BorderLayout.CENTER;Borderlayout.CENTER;BorderLayout.LEFT;BorderLayout.RIGHT。
2，流式布局：FlowLayout。布局方式为从左到右，从上到下。是JPanel(轻量级容器)的默认面板布局。
3，网格布局：GridLayout。布局方式为行和列组成的网络。布局方法：setLayout(new
GridLayout(3,2,3,3));其中强两位数字表示三行两列，后两位表示行与行的间距为3，列与列的间距为3.
接着，就接触到JPanel面板。JPanel是非顶层容器，所以，一个界面只能由一个JFrame，但是可以有多个JPanel组件。其默认布局方式为流式布局。在JPanel这块，学到了用户登录界面的设计。从而接触到另外三个组件：文本框组件：JTextField;密码框组件：JPasswordField;标签组件：JLabel;复选框组件：JCheckBox;单选框组件：JRadioButton;按钮组件JButton。

用JAVA语言编程实现一个用户登录窗口

方法一：
采用JOptionPane中的一个非常有用的静态方法 showOptionPane()；
源码如下：
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JOptionPane;
import javax.swing.BoxLayout;
import javax.swing.Box;
import javax.swing.BorderFactory;
public class Login1 {
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
static void createAndShowGUI() {
JFrame mainFrame = new JFrame();
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setBounds(250,250,400,300);
mainFrame.setVisible(false);
usernameField = new JTextField(10);
passwordField = new JPasswordField(10);
Object[] options = {"登录","取消"};
int i = JOptionPane.showOptionDialog(null,createLoginPanel(),"登录信息",JOptionPane.DEFAULT_OPTION,JOptionPane.PLAIN_MESSAGE,null,options,options[0]);
if(i==0) {
String username = usernameField.getText();
String password = passwordField.getText();
if(!username.equals("") && !password.equals("")) {
mainFrame.getContentPane().add(new JLabel("用户名："+username+" 密码是："+password,JLabel.CENTER));
mainFrame.show();
}
else {
JOptionPane.showMessageDialog(null,"用户名和密码不能为空","提示",JOptionPane.WARNING_MESSAGE);
System.exit(1);
}
}
else System.exit(0);
}
static JPanel createLoginPanel() {
JPanel ret = new JPanel();

JPanel usernamePanel = new JPanel();
usernamePanel.add(new JLabel("用户名：",JLabel.RIGHT));
usernamePanel.add(usernameField);
JPanel passwordPanel = new JPanel();
passwordPanel.add(new JLabel("密 码：",JLabel.RIGHT));
passwordPanel.add(passwordField);

Box box = new Box(BoxLayout.Y_AXIS);
box.add(usernamePanel); box.add(passwordPanel);
ret.add(box);

ret.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(new Color(244,144,44)),"填写登录信息"));
return ret;
}
static JFrame mainFrame = null;
static JTextField usernameField = null;
static JPasswordField passwordField = null;
}
运行：
javac -deprecation Login1.java
java Login
（因为有一个过期的API，所以用了 -deprecation 命令）
方法二，使用了两个JFrame类共同实现，第一次显示第一个frame，当点了登录后且操作合法时，第一个窗口就被释放了 dispose()；再显示第二个窗口：
源码如下：
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
public class Login2 {
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
static void createAndShowGUI() {
//////////////////////////////////////////////////////////////
loginWindow = new JFrame("登录信息");
loginWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
loginWindow.setBounds(350,350,250,200);
loginWindow.setResizable(false);
JPanel usernamePanel = new JPanel();
usernamePanel.add(new JLabel("用户名：",JLabel.CENTER));
usernamePanel.add(usernameField);
JPanel passwordPanel = new JPanel();
passwordPanel.add(new JLabel("密 码：",JLabel.CENTER));
passwordPanel.add(passwordField);
Box box = new Box(BoxLayout.Y_AXIS);
box.add(usernamePanel); box.add(passwordPanel);
JPanel infoPanel = new JPanel();
infoPanel.add(box);
infoPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(new Color(244,144,44)),"填写登录信息"));
JButton submitButton = new JButton("登录");
JButton cancelButton = new JButton("取消");
submitButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
String username = usernameField.getText();
String password = passwordField.getText();

if(!username.equals("") && !password.equals("")) {
loginWindow.dispose();
mainFrame.getContentPane().add(new JLabel("用户名："+username+" 密码是："+password,JLabel.CENTER));
mainFrame.setVisible(true);
}
else {
JOptionPane.showMessageDialog(null,"用户名和密码不能为空","提示",JOptionPane.WARNING_MESSAGE);
System.exit(1);
}
}
});
cancelButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
JPanel buttonPanel = new JPanel();
buttonPanel.add(submitButton); buttonPanel.add(cancelButton);
loginWindow.getContentPane().add(infoPanel,BorderLayout.CENTER);
loginWindow.getContentPane().add(buttonPanel,BorderLayout.SOUTH);
loginWindow.getContentPane().add(new JPanel(),BorderLayout.EAST);
loginWindow.getContentPane().add(new JPanel(),BorderLayout.WEST);
loginWindow.setVisible(true);
/////////////////////////////////////////////////////////////////
mainFrame = new JFrame();
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setBounds(250,250,400,300);
mainFrame.setVisible(false);
}
static JFrame loginWindow,mainFrame;
static final JTextField usernameField = new JTextField(10);
static final JPasswordField passwordField = new JPasswordField(10);
}
运行：
javac -deprecation Login2.java
java Login2
可以直接拿去运行
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class MainUI {
private String username;
private String password;
private JFrame login_Frame;
private JLabel username_Label;
private JLabel password_Label;
private JTextField username_Field;
private JPasswordField password_Field;
private JButton reset_Button;
private JButton submit_Button;
private static MainUI clientUI = new MainUI();;
public static MainUI getUIClass() {
return clientUI;
}
/**
* 创建登陆窗口
*/
public void createLoginUI() {
login_Frame = new JFrame();
login_Frame.setTitle("chaochao简易聊天室登陆框");
login_Frame.setSize(210, 170);
username_Field = new JTextField(10);
password_Field = new JPasswordField(10);
username_Label = new JLabel("用户名");
password_Label = new JLabel("密 码");
reset_Button = new JButton("重置");
submit_Button = new JButton("登陆");
java.awt.FlowLayout fl = new java.awt.FlowLayout();
login_Frame.setLayout(fl);
login_Frame.add(username_Label);
login_Frame.add(username_Field);
login_Frame.add(password_Label);
login_Frame.add(password_Field);
login_Frame.add(submit_Button);
login_Frame.add(reset_Button);
login_Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//窗体居中
login_Frame.setLocationRelativeTo(null);
login_Frame.setVisible(true);
//重置按钮加事件监听器
reset_Button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
username_Field.setText("");
password_Field.setText("");
}
});
//登录按钮加事件监听器
submit_Button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
username = username_Field.getText();
password = password_Field.getText();
//判断用户名密码是否正确
if (username.equals("admin") && password.equals("123")) {
JOptionPane.showMessageDialog(null, "登陆成功！", "消息",
JOptionPane.INFORMATION_MESSAGE);
login_Frame.dispose();
} else {
JOptionPane.showMessageDialog(null, "用户名或密码错误！", "错误",
JOptionPane.ERROR_MESSAGE);
}
}
});
}
public static void main(String[] args) {
MainUI c = getUIClass();
c.createLoginUI();
}
}
package denglujiemian;
import java.awt.Choice;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.SplashScreen;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.List;
import javax.swing.DefaultCellEditor;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
class denglujiemian extends JFrame implements ActionListener{
JFrame jf=new JFrame("QQ2010");
JPanel jp=new JPanel();
JLabel jl[]=new JLabel[9];
char c;
JButton jb1,jb2;
JCheckBox jc1,jc2;
JMenu ch=new JMenu();
JMenuItem jm=new JMenuItem("登录",new ImageIcon("image\\.jpg"));
JComboBox jcb=new JComboBox ();
JPasswordField jtf=new JPasswordField(12);
Color color=new Color(228,244,255);
DefaultCellEditor dce=new DefaultCellEditor(jcb);
denglujiemian(){
jf.setContentPane(new MyPanel());
jf.setBounds(400, 300, 340, 250);
jf.setLayout(null);
Image image = Toolkit.getDefaultToolkit().getImage("image\\qq.jpg");
jf.setIconImage(image);
Icon icon=new ImageIcon("image\\logo.jpg");
jl[1]=new JLabel("",icon,SwingConstants.TRAILING);
Icon icon1=new ImageIcon("image\\di.jpg");
jl[6]=new JLabel("",icon1,SwingConstants.TRAILING);
jl[2]=new JLabel("账号:");
jl[3]=new JLabel("密码:");
jl[4]=new JLabel("注册新账号");
jl[5]=new JLabel("找回密码");
jl[7]=new JLabel("状态：");
jc1=new JCheckBox("记住密码");
jc2=new JCheckBox("自动登录");
jb1=new JButton("设置");
jb2=new JButton("登录");
jb1.setBounds(10, 187, 70, 20);
jb2.setBounds(255, 187, 70, 20);
jl[1].setBounds(0, 0, 335, 64);
jl[2].setBounds(25, 80, 50,20);
jl[3].setBounds(25, 120, 50, 20);
jl[4].setBounds(253, 80, 70, 20);
jl[4].setForeground(Color.BLUE);
jl[5].setBounds(253, 120, 70, 20);
jl[5].setForeground(Color.blue);
jl[6].setBounds(0, 182, 340, 34);//底边图片
jl[7].setBounds(25, 150, 80, 20);
jc1.setBounds(100 ,150, 80, 20);
jc1.setBackground(color);
jc2.setBounds(180 ,150, 80, 20);
jc2.setBackground(color);
jcb.setBounds(60, 80, 190, 22);
ch.setBounds(60, 150, 30, 20);
jtf.setBounds(60, 120,190, 22);
jcb.setEditable(true);
ch.add(jm);
jf.add(jb1);
jf.add(jb2);
jf.add(jc1);
jf.add(jc2);
jf.add(jl[7]);
jf.add(jl[6]);
jf.add(jl[4]);
jf.add(jl[5]);
jf.add(jl[3]);
jf.add(jl[2]);
jf.add(jl[1]);
jf.add(jtf);
jf.add(jcb);
jf.add(ch);
jf.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});

jf.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub

}
}
public class denglu {
public static void main(String[] args) {
// TODO Auto-generated method stub

new denglujiemian();
}
private class MyPanel extends JPanel {
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
super.paintComponent(g);
Image img = Toolkit.getDefaultToolkit().getImage("image\beijin.jpg");
g2.drawImage(img, 0, 0, this.getWidth(),this.getHeight(), this);
}
}

}

用java程序编写一个简单的登录界面怎么写？

程序如下:
mport java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
@SuppressWarnings("serial")
public class MainFrame extends JFrame {
JLabel lbl1 = new JLabel("用户名:");
JLabel lbl2 = new JLabel("密 码:");
JTextField txt = new JTextField("admin",20);
JPasswordField pwd = new JPasswordField(20);
JButton btn = new JButton("登录");
JPanel pnl = new JPanel();
private int error = 0;
public MainFrame(String title) throws HeadlessException {
super(title);
init();
}
private void init() {
this.setResizable(false);
pwd.setEchoChar('*');
pnl.add(lbl1);
pnl.add(txt);
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if ("admin".equal花憨羔窖薏忌割媳公颅s(new String(pwd.getPassword()))){
pnl.removeAll();
JLabel lbl3 = new JLabel();
ImageIcon icon = new ImageIcon(this.getClass().getResource("pic.jpg"));
lbl3.setIcon(icon);
pnl.add(lbl3);
}
else{
if(error < 3){
JOptionPane.showMessageDialog(null,"密码输入错误，请再试一次");
error++;
}
else{
JOptionPane.showMessageDialog(null,"对不起，您不是合法用户");
txt.setEnabled(false);
pwd.setEnabled(false);
btn.setEnabled(false);
}
}
}
});
}
public static void main(String[] args) {
MainFrame frm = new MainFrame("测试");
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setBounds(100, 100, 300, 120);
frm.setVisible(true);
}
}
编程的注意事项:
1、Java是一门面向对象编程语言，不仅吸收了C++语言的各种优点，还摒弃了C++里难以理解的多继承、指针等概念，因此Java语言具有功能强大和简单易用两个特征。Java语言作为静态面向对象编程语言的代表，极好地实现了面向对象理论，允许程序员以优雅的思维方式进行复杂的编程。
2、 Java具有简单性、面向对象、分布式、健壮性、安全性、平台独立与可移植性、多线程、动态性等特点。Java可以编写桌面应用程序、Web应用程序、分布式系统和嵌入式系统应用程序等。
3、2006年11月13日，Java技术的发明者Sun公司宣布，将Java技术作为免费软件对外发布。Sun公司正式发布的有关Java平台标准版的第一批源代码，以及Java迷你版的可执行源代码。从2007年3月起，全世界所有的开发人员均可对Java源代码进行修改。

JAVA根据GUI相关知识，编程实现一个简单的用户登录界面。不考虑事件的处理，只实现界面。

import java.awt.FlowLayout;import java.awt.GridLayout;import javax.swing.JButton;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JPasswordField;import javax.swing.JTextField;public class LoginFrame extends JFrame{ public LoginFrame() { setTitle("登录"); setSize(300, 140); setResizable(false); setAlwaysOnTop(true); setLayout(new GridLayout(3, 1)); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); addComps(); setVisible(true); } private void addComps() { String[] ts = { "用户名：", "密码：" }; for(int i = 0; i < ts.length; i++) { JPanel p1 = new JPanel(new FlowLayout(FlowLayout.RIGHT)); JLabel b1 = new JLabel(ts[i]); p1.add(b1); JComponent f1 = null; if(i == 0) { f1 = new JTextField(20); } else { f1 = new JPasswordField(20); ((JPasswordField) f1).setEchoChar('*'); } p1.add(f1); add(p1); } JPanel p = new JPanel(new FlowLayout(FlowLayout.CENTER)); JButton b1 = new JButton("登录"); JButton b2 = new JButton("重置"); p.add(b1); p.add(b2); add(p); } public static void main(String[] args) { new LoginFrame(); }}

如何用java做登录界面

import javax.swing.JFrame;//框架
import javax.swing.JPanel;//面板
import javax.swing.JButton;//按钮
import javax.swing.JLabel;//标签
import javax.swing.JTextField;//文本框
import java.awt.Font;//字体
import java.awt.Color;//颜色
import javax.swing.JPasswordField;//密码框
import java.awt.event.ActionListener;//事件监听
import java.awt.event.ActionEvent;//事件处理
import javax.swing.JOptionPane;//消息窗口public class UserLogIn extends JFrame{
public JPanel pnluser;
public JLabel lbluserLogIn;
public JLabel lbluserName;
public JLabel lbluserPWD;
public JTextField txtName;
public JPasswordField pwdPwd;
public JButton btnSub;
public JButton btnReset;
public UserLogIn(){
pnluser = new JPanel();
lbluserLogIn = new JLabel();
lbluserName = new JLabel();
lbluserPWD = new JLabel();
txtName = new JTextField();
pwdPwd = new JPasswordField();
btnSub = new JButton();
btnReset = new JButton();
userInit();
}
public void userInit(){
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置关闭框架的同时结束程序
this.setSize(300,200);//设置框架大小为长300,宽200
this.setResizable(false);//设置框架不可以改变大小
this.setTitle("用户登录");//设置框架标题
this.pnluser.setLayout(null);//设置面板布局管理
this.pnluser.setBackground(Color.cyan);//设置面板背景颜色
this.lbluserLogIn.setText("用户登录");//设置标签标题
this.lbluserLogIn.setFont(new Font("宋体",Font.BOLD | Font.ITALIC,14));//设置标签字体
this.lbluserLogIn.setForeground(Color.RED);//设置标签字体颜色
this.lbluserName.setText("用户名:");
this.lbluserPWD.setText("密 码:");
this.btnSub.setText("登录");
this.btnReset.setText("重置");
this.lbluserLogIn.setBounds(120,15,60,20);//设置标签x坐标120,y坐标15,长60,宽20
this.lbluserName.setBounds(50,55,60,20);
this.lbluserPWD.setBounds(50,85,60,25);
this.txtName.setBounds(110,55,120,20);
this.pwdPwd.setBounds(110,85,120,20);
this.btnSub.setBounds(85,120,60,20);
this.btnSub.addActionListener(new ActionListener()//匿名类实现ActionListener接口
{
public void actionPerformed(ActionEvent e){
btnsub_ActionEvent(e);
}
}
);
this.btnReset.setBounds(155,120,60,20);
this.btnReset.addActionListener(new ActionListener()//匿名类实现ActionListener接口
{
public void actionPerformed(ActionEvent e){
btnreset_ActionEvent(e);
}
}
);
this.pnluser.add(lbluserLogIn);//加载标签到面板
this.pnluser.add(lbluserName);
this.pnluser.add(lbluserPWD);
this.pnluser.add(txtName);
this.pnluser.add(pwdPwd);
this.pnluser.add(btnSub);
this.pnluser.add(btnReset);
this.add(pnluser);//加载面板到框架
this.setVisible(true);//设置框架可显
}
public void btnsub_ActionEvent(ActionEvent e){
String name = txtName.getText();
String pwd = String.valueOf(pwdPwd.getPassword());
if(name.equals("")){
JOptionPane.showMessageDialog(null,"账号不能为空","错误",JOptionPane.ERROR_MESSAGE);
return;
}else if (pwd.equals("")){
JOptionPane.showMessageDialog(null,"密码不能为空","错误",JOptionPane.ERROR_MESSAGE);
return;
}else if(true){
this.dispose();
}else{
JOptionPane.showMessageDialog(null,"账号或密码错误","错误",JOptionPane.ERROR_MESSAGE);
return;
}
}
public void btnreset_ActionEvent(ActionEvent e){
txtName.setText("");
pwdPwd.setText("");
}
public static void main(String[] args){
new UserLogIn();
}
}

java实现简单登录界面

自己写的比较规范的代码，都有注释:
import javax.swing.JFrame;//框架
import javax.swing.JPanel;//面板
import javax.swing.JButton;//按钮
import javax.swing.JLabel;//标签
import javax.swing.JTextField;//文本框
import java.awt.Font;//字体
import java.awt.Color;//颜色
import javax.swing.JPasswordField;//密码框
import java.awt.event.ActionListener;//事件监听
import java.awt.event.ActionEvent;//事件处理
import javax.swing.JOptionPane;//消息窗口
public class UserLogIn extends JFrame{
public JPanel pnluser;
public JLabel lbluserLogIn;
public JLabel lbluserName;
public JLabel lbluserPWD;
public JTextField txtName;
public JPasswordField pwdPwd;
public JButton btnSub;
public JButton btnReset;
public UserLogIn(){
pnluser = new JPanel();
lbluserLogIn = new JLabel();
lbluserName = new JLabel();
lbluserPWD = new JLabel();
txtName = new JTextField();
pwdPwd = new JPasswordField();
btnSub = new JButton();
btnReset = new JButton();
userInit();
}
public void userInit(){
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置关闭框架的同时结束程序
this.setSize(300,200);//设置框架大小为长300,宽200
this.setResizable(false);//设置框架不可以改变大小
this.setTitle("用户登录");//设置框架标题
this.pnluser.setLayout(null);//设置面板布局管理
this.pnluser.setBackground(Color.cyan);//设置面板背景颜色
this.lbluserLogIn.setText("用户登录");//设置标签标题
this.lbluserLogIn.setFont(new Font("宋体",Font.BOLD | Font.ITALIC,14));//设置标签字体
this.lbluserLogIn.setForeground(Color.RED);//设置标签字体颜色
this.lbluserName.setText("用户名:");
this.lbluserPWD.setText("密 码:");
this.btnSub.setText("登录");
this.btnReset.setText("重置");
this.lbluserLogIn.setBounds(120,15,60,20);//设置标签x坐标120,y坐标15,长60,宽20
this.lbluserName.setBounds(50,55,60,20);
this.lbluserPWD.setBounds(50,85,60,25);
this.txtName.setBounds(110,55,120,20);
this.pwdPwd.setBounds(110,85,120,20);
this.btnSub.setBounds(85,120,60,20);
this.btnSub.addActionListener(new ActionListener()//匿名类实现ActionListener接口
{
public void actionPerformed(ActionEvent e){
btnsub_ActionEvent(e);
}
}
);
this.btnReset.setBounds(155,120,60,20);
this.btnReset.addActionListener(new ActionListener()//匿名类实现ActionListener接口
{
public void actionPerformed(ActionEvent e){
btnreset_ActionEvent(e);
}
}
);
this.pnluser.add(lbluserLogIn);//加载标签到面板
this.pnluser.add(lbluserName);
this.pnluser.add(lbluserPWD);
this.pnluser.add(txtName);
this.pnluser.add(pwdPwd);
this.pnluser.add(btnSub);
this.pnluser.add(btnReset);
this.add(pnluser);//加载面板到框架
this.setVisible(true);//设置框架可显
}
public void btnsub_ActionEvent(ActionEvent e){
String name = txtName.getText();
String pwd = String.valueOf(pwdPwd.getPassword());
if(name.equals("")){
JOptionPane.showMessageDialog(null,"账号不能为空","错误",JOptionPane.ERROR_MESSAGE);
return;
}else if (pwd.equals("")){
JOptionPane.showMessageDialog(null,"密码不能为空","错误",JOptionPane.ERROR_MESSAGE);
return;
}else if(true){
this.dispose();
}else{
JOptionPane.showMessageDialog(null,"账号或密码错误","错误",JOptionPane.ERROR_MESSAGE);
return;
}
}
public void btnreset_ActionEvent(ActionEvent e){
txtName.setText("");
pwdPwd.setText("");
}
public static void main(String[] args){
new UserLogIn();
}
}
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.ActionEvent;
import java.io.*;
import javax.swing.*;
import java.awt.Button;
import java.awt.Panel;
import java.lang.String;
import javax.swing.JOptionPane;
public class QQ extends Frame implements ActionListener{
Label Lname ,Lpassword; //定义用户名和密码的标签
TextField Tname; //定义用户名的文本框
JPasswordField Tpassword; //定义密码的文本框。注：使用JPasswordField的好处就是输入的密码是以****显示给用户的
Panel panel1=new Panel(); //定义面板
Button Load,login; //定义登陆和注册的按钮
boolean b=false;
File file1; //定义记录用户注册的用户名和密码的文件夹
Writer writer;
String []Usersname=new String[1024]; //定义记录用户名的数组
String []Userspassword=new String[1024];//定义记录密码的数组
public QQ(){
Lname=new Label ("用户名");Lname.setBackground(Color.red);//设置标签的背景颜色
Lpassword=new Label ("密码");Lpassword.setBackground(Color.red);//设置标签的背景颜色
Tname=new TextField (10);
Tpassword=new JPasswordField (10);
Load=new Button("登陆");Load.setBackground(Color.lightGray);
login=new Button("注册");login.setBackground(Color.lightGray);
add(panel1,BorderLayout.CENTER);
setLayout(new CardLayout(3,2));
panel1.add(Lname);
panel1.add(Tname);
panel1.add(Lpassword);
panel1.add(Tpassword);
panel1.add(Load);Load.addActionListener(this);
panel1.add(login);login.addActionListener(this);

}
public void actionPerformed(ActionEvent e){
// 用户登录事件处理
if (e.getSource() == Load) {
String name1 = Tname.getText();
String password1 = Tpassword.getText();
boolean flag = false;
int index = 0;
for (int i = 0; i < Usersname.length; i++) {
if (name1.equals(Usersname[i])) {
flag = true;
index = i;
break;
}
}
if (flag && password1.equals(Userspassword[index])) {
//处理用户登录成功后的反馈信息
JOptionPane.showMessageDialog(null, "恭喜您登陆成功!", "消息", JOptionPane.INFORMATION_MESSAGE);
} else {
JOptionPane.showMessageDialog(null, "对不起您的用户名或密码错误!", "错误",JOptionPane.ERROR_MESSAGE);
}
}
// 用户注册模块的事件处理
if (e.getSource() == login) {
String NCmp = Tname.getText();
String PCmp = Tpassword.getText();
boolean flag = false;
for (int i = 0; i < Usersname.length; i++) {
if (NCmp.equals(Usersname[i])) {
flag = true;
break;
}
}
if (flag) {
JOptionPane.showMessageDialog(null, "对不起您的用户名已经注册!", "错误", JOptionPane.ERROR_MESSAGE);
} else {
int index = 0;
JOptionPane.showMessageDialog(null, "注册成功!", "消息", JOptionPane.INFORMATION_MESSAGE);
for (int i = 0; i < Usersname.length; i++) {
if (Usersname[i] == null) {
Usersname[i] = NCmp;
index = i;
break;
}
}
Userspassword[index] = PCmp;
}
try{
file1=new File("Student.dat");
FileWriter fw=new FileWriter(file1,true);
fw.write("用户名"+"\t\t"+"密码"+"\n");
fw.write(NCmp+"\t\t"+PCmp+"\n");
fw.close();
}catch (IOException e1){
e1.printStackTrace();
}
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame Fstudent=new QQ();
Fstudent.setSize(200,200);
Fstudent.setTitle("QQ仿真系统");

// 关闭窗口
Fstudent.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
Fstudent.setVisible(true);
}
}