java简易登录框代码 java简单登录

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如何用JAVA编写一个简单用户登陆界面？

什么都不说java简易登录框代码了直接给java简易登录框代码你代码吧\x0d\x0apackage com.moliying.ui;\x0d\x0aimport java.awt.BorderLayout;\x0d\x0aimport java.awt.Container;\x0d\x0aimport java.awt.FlowLayout;\x0d\x0aimport java.awt.List;\x0d\x0aimport java.awt.event.ActionEvent;\x0d\x0aimport java.awt.event.ActionListener;\x0d\x0aimport java.io.BufferedWriter;\x0d\x0aimport java.io.FileOutputStream;\x0d\x0aimport java.io.OutputStreamWriter;\x0d\x0aimport java.util.ArrayList;\x0d\x0aimport java.util.Arrays;\x0d\x0aimport javax.swing.JButton;\x0d\x0aimport javax.swing.JFrame;\x0d\x0aimport javax.swing.JLabel;\x0d\x0aimport javax.swing.JPanel;\x0d\x0aimport javax.swing.JPasswordField;\x0d\x0aimport javax.swing.JTextField;\x0d\x0apublic class Login {\x0d\x0aprivate JFrame frame = new JFrame("登录");\x0d\x0aprivate Container c = frame.getContentPane();\x0d\x0aprivate JTextField username = new JTextField();\x0d\x0aprivate JPasswordField password = new JPasswordField();\x0d\x0aprivate JButton ok = new JButton("确定");\x0d\x0aprivate JButton cancel = new JButton("取消");\x0d\x0apublic Login() {\x0d\x0aframe.setSize(300, 200);\x0d\x0aframe.setBounds(450, 300, 300, 200);\x0d\x0ac.setLayout(new BorderLayout());\x0d\x0ainitFrame();\x0d\x0aframe.setVisible(true);\x0d\x0a}\x0d\x0aprivate void initFrame() {\x0d\x0a// 顶部\x0d\x0aJPanel titlePanel = new JPanel();\x0d\x0atitlePanel.setLayout(new FlowLayout());\x0d\x0atitlePanel.add(new JLabel("系统管理员登录"));\x0d\x0ac.add(titlePanel, "North");\x0d\x0a// 中部表单\x0d\x0aJPanel fieldPanel = new JPanel();\x0d\x0afieldPanel.setLayout(null);\x0d\x0aJLabel a1 = new JLabel("用户名:");\x0d\x0aa1.setBounds(50, 20, 50, 20);\x0d\x0aJLabel a2 = new JLabel("密码:");\x0d\x0aa2.setBounds(50, 60, 50, 20);\x0d\x0afieldPanel.add(a1);\x0d\x0afieldPanel.add(a2);\x0d\x0ausername.setBounds(110, 20, 120, 20);\x0d\x0apassword.setBounds(110, 60, 120, 20);\x0d\x0afieldPanel.add(username);\x0d\x0afieldPanel.add(password);\x0d\x0ac.add(fieldPanel, "Center");\x0d\x0a// 底部按钮\x0d\x0aJPanel buttonPanel = new JPanel();\x0d\x0abuttonPanel.setLayout(new FlowLayout());\x0d\x0abuttonPanel.add(ok);\x0d\x0abuttonPanel.add(cancel);\x0d\x0ac.add(buttonPanel, "South");\x0d\x0a\x0d\x0aok.addActionListener(new ActionListener() {\x0d\x0a\x0d\x0a@Override\x0d\x0apublic void actionPerformed(ActionEvent e) {\x0d\x0aSystem.out.println(username.getText().toString());\x0d\x0a}\x0d\x0a});\x0d\x0a\x0d\x0acancel.addActionListener(new ActionListener() {\x0d\x0a\x0d\x0a@Override\x0d\x0apublic void actionPerformed(ActionEvent e) {\x0d\x0aframe.setVisible(false);\x0d\x0a}\x0d\x0a});\x0d\x0a}\x0d\x0apublic static void main(String[] args) {\x0d\x0a//new Login();\x0d\x0a\x0d\x0aString ss = "abbabbbaabbbccba";\x0d\x0a\x0d\x0aSystem.out.println(ss.split("b").length);\x0d\x0a\x0d\x0a}\x0d\x0a}

相关问答

Q1: 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();

}

Q2: 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))

.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

Q3: 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！

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