java登录按钮设计代码 java用户登录界面设计代码

登陆界面的java代码怎么写?

import java.awt.*; \x0d\x0aimport javax.swing.*; \x0d\x0aimport java.awt.event.*; \x0d\x0aimport java.sql.*; \x0d\x0a\x0d\x0aclass LoginFrm extends JFrame implements ActionListener \x0d\x0a{ \x0d\x0aJLabel lbl1=new JLabel("用户名"); \x0d\x0aJLabel lbl2=new JLabel("密码"); \x0d\x0aJTextField txt=new JTextField(15); \x0d\x0aJPasswordField pf=new JPasswordField(); \x0d\x0aJButton btn1=new JButton("确定"); \x0d\x0aJButton btn2=new JButton("取消"); \x0d\x0a\x0d\x0apublic LoginFrm() \x0d\x0a{ \x0d\x0athis.setTitle("登陆"); \x0d\x0aJPanel jp=(JPanel)this.getContentPane(); \x0d\x0ajp.setLayout(new GridLayout(3,2,10,10)); \x0d\x0ajp.add(lbl1);jp.add(txt); \x0d\x0ajp.add(lbl2);jp.add(pf); \x0d\x0ajp.add(btn1);jp.add(btn2); \x0d\x0abtn1.addActionListener(this); \x0d\x0abtn2.addActionListener(this); \x0d\x0a} \x0d\x0a\x0d\x0apublic void actionPerformed(ActionEvent ae) \x0d\x0a{ \x0d\x0aif(ae.getSource()==btn1) \x0d\x0a{ \x0d\x0atry \x0d\x0a{ \x0d\x0aClass.forName("sun.jdbc.odbc.JdbcOdbcDriver"); \x0d\x0aConnection con=DriverManager.getConnection("jdbc:odbc:MyDB","",""); \x0d\x0aStatement cmd=con.createStatement(); \x0d\x0aResultSet rs=cmd.executeQuery("select * from loginAndpassword where login='"+txt.getText()+"' and password='"+pf.getText()+"'"); \x0d\x0aif(rs.next()) \x0d\x0a{ \x0d\x0aJOptionPane.showMessageDialog(null,"登陆成功!"); \x0d\x0a} \x0d\x0aelse \x0d\x0aJOptionPane.showMessageDialog(null,"用户名或密码错误!"); \x0d\x0a} catch(Exception ex){} \x0d\x0a\x0d\x0aif(ae.getSource()==btn2) \x0d\x0a{ \x0d\x0atxt.setText(""); \x0d\x0apf.setText(""); \x0d\x0a} \x0d\x0a} \x0d\x0a} \x0d\x0a\x0d\x0apublic static void main(String arg[]) \x0d\x0a{ \x0d\x0aJFrame.setDefaultLookAndFeelDecorated(true); \x0d\x0aLoginFrm frm=new LoginFrm(); \x0d\x0afrm.setSize(400,200); \x0d\x0afrm.setVisible(true); \x0d\x0a} \x0d\x0a}

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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。

实现界面登陆,退出功能的java代码怎么写?

CS结构系统的退出如下:public void init() {\x0d\x0a this.setTitle("用户登录界面");\x0d\x0a this.add(createCenterPane());\x0d\x0a this.setDefaultCloseOperation(this.DO_NOTHING_ON_CLOSE);\x0d\x0a this.setSize(new Dimension(450, 335));\x0d\x0a this.setLocationRelativeTo(null);\x0d\x0a // this.setVisible(true);\x0d\x0a this.addWindowListener(new WindowAdapter() {\x0d\x0a public void windowClosing(WindowEvent e) {\x0d\x0a int choose = JOptionPane.showConfirmDialog(null, "是否要退出登录界面?",\x0d\x0a "系统提示:", JOptionPane.YES_NO_OPTION);\x0d\x0a if (choose == JOptionPane.YES_OPTION) {\x0d\x0a System.exit(1);\x0d\x0a }\x0d\x0a }\x0d\x0a });\x0d\x0a }其中this为JFrame对象。BS结构的退出直接用windows.close()方法就行了!

用Java设计一个登录页面,不用连接数据库,只要把用户和密码信息存放在文本里面,怎样设计代码???

/* Main.java

*

* Created on __DATE__, __TIME__

*/

import javax.swing.JOptionPane;

/**

*

* @author __USER__

*/

public class Main extends javax.swing.JFrame {

/** Creates new form Main */

public Main() {

initComponents();

}

/** This method is called from within the constructor to

* initialize the form.

* WARNING: Do NOT modify this code. The content of this method is

* always regenerated by the Form Editor.

*/

//GEN-BEGIN:initComponents

// editor-fold defaultstate="collapsed" desc="Generated Code"

private void initComponents() {

jPanel1 = new javax.swing.JPanel(); //标签

jLabel1 = new javax.swing.JLabel();

jLabel2 = new javax.swing.JLabel();

jLabel3 = new javax.swing.JLabel();

jButton1 = new javax.swing.JButton(); //登录按钮

jButton2 = new javax.swing.JButton(); //

jTextField1 = new javax.swing.JTextField(); //文本框

jTextField2 = new javax.swing.JTextField();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); //关闭时的操作,即退出程序

setTitle("登录界面"); //设置标题:欢迎使用股票管理系统

setResizable(false); //设置窗口不可调节大小

jLabel1.setFont(new java.awt.Font("微软雅黑", 0, 18)); //设置标签的字体

jLabel1

.setText("您好,请输入信息");

jLabel2.setText("用户名");

jLabel3.setText("用户密码");

jButton1.setText("登录");

jButton1.addActionListener(new java.awt.event.ActionListener() { //采用匿名内部类来实现按钮监听功能

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton1ActionPerformed(evt);

}

});

jButton2.setText("退出");

jButton2.addActionListener(new java.awt.event.ActionListener() { //同上

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton2ActionPerformed(evt);

}

});

javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout( //层次布局管理器,下面n长的代码,就是设置位置,自己看吧,呵呵,这个必须的,就不多写了

jPanel1);

jPanel1.setLayout(jPanel1Layout);

jPanel1Layout

.setHorizontalGroup(jPanel1Layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(

javax.swing.GroupLayout.Alignment.TRAILING,

jPanel1Layout.createSequentialGroup()

.addContainerGap(159, Short.MAX_VALUE)

.addComponent(jLabel1).addGap(140, 140,

140))

.addGroup(

jPanel1Layout

.createSequentialGroup()

.addGap(110, 110, 110)

.addGroup(

jPanel1Layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jLabel2)

.addComponent(jLabel3))

.addGap(54, 54, 54)

.addGroup(

jPanel1Layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(

jPanel1Layout

.createSequentialGroup()

.addComponent(

jTextField2,

javax.swing.GroupLayout.DEFAULT_SIZE,

191,

Short.MAX_VALUE)

.addGap(

112,

112,

112))

.addGroup(

jPanel1Layout

.createSequentialGroup()

.addComponent(

jTextField1,

javax.swing.GroupLayout.PREFERRED_SIZE,

191,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap())))

.addGroup(

jPanel1Layout

.createSequentialGroup()

.addGap(141, 141, 141)

.addComponent(

jButton1,

javax.swing.GroupLayout.PREFERRED_SIZE,

68,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(89, 89, 89)

.addComponent(

jButton2,

javax.swing.GroupLayout.PREFERRED_SIZE,

72,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap(145, Short.MAX_VALUE)));

jPanel1Layout

.setVerticalGroup(jPanel1Layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(

jPanel1Layout

.createSequentialGroup()

.addContainerGap()

.addComponent(jLabel1)

.addGap(55, 55, 55)

.addGroup(

jPanel1Layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jLabel2)

.addComponent(

jTextField1,

javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(41, 41, 41)

.addGroup(

jPanel1Layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jLabel3)

.addComponent(

jTextField2,

javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(43, 43, 43)

.addGroup(

jPanel1Layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(

jButton1,

javax.swing.GroupLayout.PREFERRED_SIZE,

33,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(

jButton2,

javax.swing.GroupLayout.PREFERRED_SIZE,

33,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addContainerGap(48, Short.MAX_VALUE)));

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(

getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(layout.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING).addGroup(

layout.createSequentialGroup().addContainerGap().addComponent(

jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addContainerGap()));

layout.setVerticalGroup(layout.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING).addGroup(

layout.createSequentialGroup().addContainerGap().addComponent(

jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE,

Short.MAX_VALUE)));

pack();

setLocationRelativeTo(null); //居中

}// /editor-fold

//GEN-END:initComponents

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { //事件处理,不建议这样做

// TODO add your handling code here:

String name = this.jTextField1.getText().trim(); //获得用户名,去空格

String password = this.jTextField2.getText().trim(); //获得密码,去空格

if (name.equals("admin") password.equals("123456")) { //如果符合条件.....其实这里应该去和数据库关联,这是死代码

// Showinformation sf=new Showinformation(); //我估计是另外一个框架,就是登录成功之后的框架

// sf.setVisible(true);

// sf.show(); //这个方法就直接秒杀,不用了,因为sf.setVisible(true)已经被调用了,这里就多次一举了

} else { //用户名或者密码验证失败

JOptionPane.showMessageDialog(this, "用户名或者密码错误啦~", "提示", //提示框

JOptionPane.INFORMATION_MESSAGE);

this.jTextField1.setText(""); //清空输入框

this.jTextField2.setText("");

}

}

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { //事件处理,其实可以将jButton1ActionPerformed放在一起处理,只要获得按钮的标签内容 (JButton)(evt.getSuorse()).getText()就做对比就ko了

// TODO add your handling code here:

System.exit(0);

}

/**

* @param args the command line arguments

*/

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() { //好方法,呵呵使用该方式的原因是:awt是单线程模式的,所有awt的组件只能在(推荐方式)事件处理线程中访问,从而保证组件状态的可确定性。java核心编程技术中每个实例基本都用到了

public void run() {

new Main().setVisible(true);

}

});

}

//GEN-BEGIN:variables

// Variables declaration - do not modify

private javax.swing.JButton jButton1;

private javax.swing.JButton jButton2;

private javax.swing.JLabel jLabel1;

private javax.swing.JLabel jLabel2;

private javax.swing.JLabel jLabel3;

private javax.swing.JPanel jPanel1;

private javax.swing.JTextField jTextField1;

private javax.swing.JTextField jTextField2;}

// End of variables declaration//GEN-END:variables

你修改一下吧,从记事本获得用户名判断一下就行了


分享名称:java登录按钮设计代码 java用户登录界面设计代码
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