java界面登錄界面
① 用java寫一個登陸界面代碼。
概述
具體框架使用jframe，文本框組件：JTextField；密碼框組件：JPasswordField；標簽組件：JLabel；復選框組件：JCheckBox；單選框組件：JRadioButton；按鈕組件JButton。
登錄界面：
Swing 是一個為Java設計的GUI工具包。
Swing是JAVA基礎類的一部分。
Swing包括了圖形用戶界面（GUI）器件如：文本框，按鈕，分隔窗格和表。
Swing提供許多比AWT更好的屏幕顯示元素。它們用純Java寫成，所以同Java本身一樣可以跨平台運行，這一點不像AWT。它們是JFC的一部分。它們支持可更換的面板和主題（各種操作系統默認的特有主題），然而不是真的使用原生平台提供的設備，而是僅僅在表面上模仿它們。這意味著你可以在任意平台上使用JAVA支持的任意麵板。輕量級組件的缺點則是執行速度較慢，優點就是可以在所有平台上採用統一的行為。
概念解析：
JFrame– java的GUI程序的基本思路是以JFrame為基礎，它是屏幕上window的對象，能夠最大化、最小化、關閉。
JPanel– Java圖形用戶界面(GUI)工具包swing中的面板容器類，包含在javax.swing 包中，可以進行嵌套，功能是對窗體中具有相同邏輯功能的組件進行組合，是一種輕量級容器，可以加入到JFrame窗體中。。
JLabel– JLabel 對象可以顯示文本、圖像或同時顯示二者。可以通過設置垂直和水平對齊方式，指定標簽顯示區中標簽內容在何處對齊。默認情況下，標簽在其顯示區內垂直居中對齊。默認情況下，只顯示文本的標簽是開始邊對齊；而只顯示圖像的標簽則水平居中對齊。
JTextField–一個輕量級組件，它允許編輯單行文本。
JPasswordField– 允許我們輸入了一行字像輸入框，但隱藏星號(*) 或點創建密碼(密碼)
JButton– JButton 類的實例。用於創建按鈕類似實例中的 "Login"。
② java用戶登錄界面的設計
import javax.swing.*;
import java.awt.*;
public class Frame extends JFrame {
public static void main(String[] args) {
new Frame();
}
public Frame() throws HeadlessException {
Container contentPanel = this.getContentPane();
JPanel headerPanel = new JPanel();
headerPanel.setLayout(new FlowLayout());
headerPanel.add(new JLabel("歡迎進入學生成績管理系統"));
JPanel centerPanel = new JPanel();
centerPanel.setLayout(new GridLayout(2, 2));
centerPanel.add(new JLabel("用戶名", JLabel.CENTER));
centerPanel.add(new JTextField());
centerPanel.add(new JLabel("密碼", JLabel.CENTER));
centerPanel.add(new JTextField());
JPanel footerPanel = new JPanel();
footerPanel.setLayout(new FlowLayout());
footerPanel.add(new JButton("登錄"));
footerPanel.add(new JButton("取消"));
contentPanel.add(headerPanel, BorderLayout.NORTH);
contentPanel.add(centerPanel, BorderLayout.CENTER);
contentPanel.add(footerPanel, BorderLayout.SOUTH);
this.setTitle("Login");
this.setBounds(0, 0, 300, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
}
③ java實現簡單登錄界面
自己寫的比較規范的代碼，都有注釋:
import javax.swing.JFrame;//框架
import javax.swing.JPanel;//面板
import javax.swing.JButton;//按鈕
import javax.swing.JLabel;//標簽
import javax.swing.JTextField;//文本框
import java.awt.Font;//字體
import java.awt.Color;//顏色
import javax.swing.JPasswordField;//密碼框
import java.awt.event.ActionListener;//事件監聽
import java.awt.event.ActionEvent;//事件處理
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);//設置關閉框架的同時結束程序
this.setSize(300,200);//設置框架大小為長300,寬200
this.setResizable(false);//設置框架不可以改變大小
this.setTitle("用戶登錄");//設置框架標題
this.pnluser.setLayout(null);//設置面板布局管理
this.pnluser.setBackground(Color.cyan);//設置面板背景顏色
this.lbluserLogIn.setText("用戶登錄");//設置標簽標題
this.lbluserLogIn.setFont(new Font("宋體",Font.BOLD | Font.ITALIC,14));//設置標簽字體
this.lbluserLogIn.setForeground(Color.RED);//設置標簽字體顏色
this.lbluserName.setText("用戶名:");
this.lbluserPWD.setText("密 碼:");
this.btnSub.setText("登錄");
this.btnReset.setText("重置");
this.lbluserLogIn.setBounds(120,15,60,20);//設置標簽x坐標120,y坐標15,長60,寬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()//匿名類實現ActionListener介面
{
public void actionPerformed(ActionEvent e){
btnsub_ActionEvent(e);
}
}
);
this.btnReset.setBounds(155,120,60,20);
this.btnReset.addActionListener(new ActionListener()//匿名類實現ActionListener介面
{
public void actionPerformed(ActionEvent e){
btnreset_ActionEvent(e);
}
}
);
this.pnluser.add(lbluserLogIn);//載入標簽到面板
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);//載入面板到框架
this.setVisible(true);//設置框架可顯
}
public void btnsub_ActionEvent(ActionEvent e){
String name = txtName.getText();
String pwd = String.valueOf(pwdPwd.getPassword());
if(name.equals("")){
JOptionPane.showMessageDialog(null,"賬號不能為空","錯誤",JOptionPane.ERROR_MESSAGE);
return;
}else if (pwd.equals("")){
JOptionPane.showMessageDialog(null,"密碼不能為空","錯誤",JOptionPane.ERROR_MESSAGE);
return;
}else if(true){
this.dispose();
}else{
JOptionPane.showMessageDialog(null,"賬號或密碼錯誤","錯誤",JOptionPane.ERROR_MESSAGE);
return;
}
}
public void btnreset_ActionEvent(ActionEvent e){
txtName.setText("");
pwdPwd.setText("");
}
public static void main(String[] args){
new UserLogIn();
}
}
④ 用java程序編寫一個簡單的登錄界面怎麼寫
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("用戶名:");
JLabel lbl2 = new JLabel("密 碼:");
JTextField txt = new JTextField("admin",20);
JPasswordField pwd = new JPasswordField(20);
JButton btn = new JButton("登錄");
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顱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,"密碼輸入錯誤，請再試一次");
error++;
}
else{
JOptionPane.showMessageDialog(null,"對不起，您不是合法用戶");
txt.setEnabled(false);
pwd.setEnabled(false);
btn.setEnabled(false);
}
}
}
});
}
public static void main(String[] args) {
MainFrame frm = new MainFrame("測試");
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setBounds(100, 100, 300, 120);
frm.setVisible(true);
}
}
⑤ 如何用java做登錄界面
import javax.swing.JFrame;//框架
import javax.swing.JPanel;//面板
import javax.swing.JButton;//按鈕
import javax.swing.JLabel;//標簽
import javax.swing.JTextField;//文本框
import java.awt.Font;//字體
import java.awt.Color;//顏色
import javax.swing.JPasswordField;//密碼框
import java.awt.event.ActionListener;//事件監聽
import java.awt.event.ActionEvent;//事件處理
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);//設置關閉框架的同時結束程序
this.setSize(300,200);//設置框架大小為長300,寬200
this.setResizable(false);//設置框架不可以改變大小
this.setTitle("用戶登錄");//設置框架標題
this.pnluser.setLayout(null);//設置面板布局管理
this.pnluser.setBackground(Color.cyan);//設置面板背景顏色
this.lbluserLogIn.setText("用戶登錄");//設置標簽標題
this.lbluserLogIn.setFont(new Font("宋體",Font.BOLD | Font.ITALIC,14));//設置標簽字體
this.lbluserLogIn.setForeground(Color.RED);//設置標簽字體顏色
this.lbluserName.setText("用戶名:");
this.lbluserPWD.setText("密 碼:");
this.btnSub.setText("登錄");
this.btnReset.setText("重置");
this.lbluserLogIn.setBounds(120,15,60,20);//設置標簽x坐標120,y坐標15,長60,寬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()//匿名類實現ActionListener介面
{
public void actionPerformed(ActionEvent e){
btnsub_ActionEvent(e);
}
}
);
this.btnReset.setBounds(155,120,60,20);
this.btnReset.addActionListener(new ActionListener()//匿名類實現ActionListener介面
{
public void actionPerformed(ActionEvent e){
btnreset_ActionEvent(e);
}
}
);
this.pnluser.add(lbluserLogIn);//載入標簽到面板
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);//載入面板到框架
this.setVisible(true);//設置框架可顯
}
public void btnsub_ActionEvent(ActionEvent e){
String name = txtName.getText();
String pwd = String.valueOf(pwdPwd.getPassword());
if(name.equals("")){
JOptionPane.showMessageDialog(null,"賬號不能為空","錯誤",JOptionPane.ERROR_MESSAGE);
return;
}else if (pwd.equals("")){
JOptionPane.showMessageDialog(null,"密碼不能為空","錯誤",JOptionPane.ERROR_MESSAGE);
return;
}else if(true){
this.dispose();
}else{
JOptionPane.showMessageDialog(null,"賬號或密碼錯誤","錯誤",JOptionPane.ERROR_MESSAGE);
return;
}
}
public void btnreset_ActionEvent(ActionEvent e){
txtName.setText("");
pwdPwd.setText("");
}
public static void main(String[] args){
new UserLogIn();
}
}
⑥ 用java實現QQ登錄界面怎麼寫
package ch10;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//定義該類繼承自JFrame，實現ActionListener介面
public class LoginTest extends JFrame implements ActionListener
{
//創建JPanel對象
private JPanel jp=new JPanel();
//創建3個標並加入數組
JLabel name = new JLabel("請輸入用戶名");
JLabel password = new JLabel("請輸入密碼");
JLabel show = new JLabel("");
private JLabel[] jl={name,password,show};
//創建登陸和重置按扭並加入數組
JButton login = new JButton("登陸");
JButton reset = new JButton("重置");
private JButton[] jb={login,reset};
//創建文本框以及密碼框
private JTextField jName=new JTextField();
private JPasswordField jPassword =new JPasswordField();
public LoginTest()
{
//設置布局管理器為空布局，這里自己擺放按鈕、標簽和文本框
jp.setLayout(null);
for(int i=0;i<2;i++)
{
//設置標簽和按扭的位置與大小
jl[i].setBounds(30,20+40*i,180,20);
jb[i].setBounds(30+110*i,100,80,20);
//添加標簽和按扭到JPanel容器中
jp.add(jl[i]);
jp.add(jb[i]);
//為2個按鈕注冊動作事件監聽器
jb[i].addActionListener(this);
}
//設置文本框的位置和大小，注意滿足美觀並足夠用戶名的長度
jName.setBounds(130,15,100,20);
//添加文本框到JPanel容器中
jp.add(jName);
//為文本框注冊動作事件監聽器
jName.addActionListener(this);
//設置密碼框的位置和大小，注意滿足美觀和足夠密碼的長度
jPassword.setBounds(130,60,100,20);
//添加密碼框到JPanel容器中
jp.add(jPassword);
//設置密碼框中的回顯字元，這里設置美元符號
jPassword.setEchoChar('$');
//為密碼框注冊動作事件監聽器
jPassword.addActionListener(this);
//設置用於顯示登陸狀態的標簽大小位置，並將其添加進JPanel容器
jl[2].setBounds(10,180,270,20);
jp.add(jl[2]);
//添加JPanel容器到窗體中
this.add(jp);
//設置窗體的標題、位置、大小、可見性及關閉動作
this.setTitle("登陸窗口");
this.setBounds(200,200,270,250);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//實現動作監聽器介面中的方法actionPerformed
public void actionPerformed(ActionEvent e)
{
//如果事件源為文本框
if(e.getSource()==jName)
{
//切換輸入焦點到密碼框
jPassword.requestFocus();
}
//如果事件源為重置按扭
else if(e.getSource()==jb[1])
{
//清空姓名文本框、密碼框和show標簽中的所有信息
jl[2].setText("");
jName.setText("");
jPassword.setText("");
//讓輸入焦點回到文本框
jName.requestFocus();
}
//如果事件源為登陸按鈕，則判斷登錄名和密碼是否正確
else
{
//判斷用戶名和密碼是否匹配
if(jName.getText().equals("lixiangguo")&&
String.valueOf(jPassword.getPassword()).equals("19801001"))
{
jl[2].setText("登陸成功，歡迎您的到來！");
}
else
{
jl[2].setText("對不起，您的用戶名或密碼錯誤！");
}
}
}
public static void main(String[] args)
{
//創建LoginTest窗體對象
new LoginTest();
}
}
這個簡單點的
⑦ java登錄界面
剛好以前做了個。你看下：
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class UserLogin extends JFrame implements ActionListener {// 登錄框
private JButton btn = new JButton("登錄");
public JTextField namef = new JTextField(10);
public JTextField pwdf = new JTextField(10);
public UserLogin() {
this.setTitle("登錄界面");
JLabel namel = new JLabel("用戶名：");
// JTextField namef = new JTextField(10);
JLabel pwdl = new JLabel("密碼： ");
// JPasswordField pwdf = new JPasswordField(10);
this.setLayout(new FlowLayout());
this.add(namel);
this.add(namef);
this.add(pwdl);
this.add(pwdf);
this.add(btn);
btn.addActionListener(this);
this.setResizable(false);
this.setBounds(300, 250, 200, 200);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}
public static void main(String[] args) {
new UserLogin();
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == btn) {
this.setVisible(false);// 關閉登錄框
new MainFram(namef.getText(),pwdf.getText());
}
}
// 主界面類,可以寫在另一個java文件里
class MainFram extends JFrame {
public MainFram(String name, String pwd) {
this.setTitle("登錄後的主界面");
JTextArea jt = new JTextArea();
jt.setText("用戶名：" + name + " 密碼：" + pwd);
this.add(jt);
this.setBounds(300, 250, 400, 400);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
@SuppressWarnings("unchecked")
public void test(){
ArrayList a = new ArrayList();
}
}
}
⑧ Java編程：登陸界面
publicclassLoginextendsjavax.swing.JFrame{
/**CreatesnewformLogin*/
publicLogin(){
initComponents();
}
/**
*initializetheform.
*WARNING:DoNOTmodifythiscode.Thecontentofthismethodis
*.
*/
//GEN-BEGIN:initComponents
//<editor-folddefaultstate="collapsed"desc="GeneratedCode">
privatevoidinitComponents(){
jPanel1=newjavax.swing.JPanel();
jLabel1=newjavax.swing.JLabel();
jLabel2=newjavax.swing.JLabel();
jTextField1=newjavax.swing.JTextField();
jLabel3=newjavax.swing.JLabel();
jPasswordField1=newjavax.swing.JPasswordField();
jButton1=newjavax.swing.JButton();
jButton2=newjavax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("u7528u6237u767bu5f55");
setBounds(newjava.awt.Rectangle(0,0,180,220));
setResizable(false);
jLabel1.setText("");
jLabel2.setText("u5e10u53f7");
jLabel3.setText("u5bc6u7801");
jButton1.setText("u786eu5b9a");
jButton1.addActionListener(newjava.awt.event.ActionListener(){
publicvoidactionPerformed(java.awt.event.ActionEventevt){
jButton1ActionPerformed(evt);
}
});
jButton2.setText("u53d6u6d88");
jButton2.addActionListener(newjava.awt.event.ActionListener(){
publicvoidactionPerformed(java.awt.event.ActionEventevt){
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayoutjPanel1Layout=newjavax.swing.GroupLayout(
jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout
.setHorizontalGroup(jPanel1Layout
.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
jPanel1Layout
.createSequentialGroup()
.addGroup(
jPanel1Layout
.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
jPanel1Layout
.createSequentialGroup()
.addGap(
31,
31,
31)
.addComponent(
jLabel1))
.addGroup(
jPanel1Layout
.createSequentialGroup()
.addContainerGap()
.addGroup(
jPanel1Layout
.createParallelGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
false)
.addGroup(
javax.swing.GroupLayout.Alignment.LEADING,
jPanel1Layout
.createSequentialGroup()
.addComponent(
jButton1)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.RELATED,
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addComponent(
jButton2))
.addGroup(
javax.swing.GroupLayout.Alignment.LEADING,
jPanel1Layout
.createSequentialGroup()
.addComponent(
jLabel3)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(
jPasswordField1))
.addGroup(
javax.swing.GroupLayout.Alignment.LEADING,
jPanel1Layout
.createSequentialGroup()
.addComponent(
jLabel2)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(
jTextField1,
javax.swing.GroupLayout.PREFERRED_SIZE,
108,
javax.swing.GroupLayout.PREFERRED_SIZE)))))
.addContainerGap(12,Short.MAX_VALUE)));
jPanel1Layout
.setVerticalGroup(jPanel1Layout
.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
jPanel1Layout
.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(
jPanel1Layout
.createParallelGroup(
javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(
jTextField1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(
jPanel1Layout
.createParallelGroup(
javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(
jPasswordField1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18,18,18)
.addGroup(
jPanel1Layout
.createParallelGroup(
javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2))
.addContainerGap(66,Short.MAX_VALUE)));
javax.swing.GroupLayoutlayout=newjavax.swing.GroupLayout(
getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING).addComponent(
jPanel1,javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,Short.MAX_VALUE));
layout.setVerticalGroup(layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING).addComponent(
jPanel1,javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,Short.MAX_VALUE));
pack();
}//</editor-fold>
//GEN-END:initComponents
(java.awt.event.ActionEventevt){
//TODOaddyourhandlingcodehere:
System.exit(0);
}
(java.awt.event.ActionEventevt){
//TODOaddyourhandlingcodehere:
Stringname=jTextField1.getText();
Stringpass=newString(jPasswordField1.getPassword());
System.out.println(name);
System.out.println(pass);
if(name.equals("Java")&&pass.equals("123456")){
jLabel1.setText("登錄成功!");
}else{
jLabel1.setText("登錄失敗!");
}
}
/**
*@
*/
publicstaticvoidmain(Stringargs[]){
java.awt.EventQueue.invokeLater(newRunnable(){
publicvoidrun(){
newLogin().setVisible(true);
}
});
}
//GEN-BEGIN:variables
//Variablesdeclaration-donotmodify
privatejavax.swing.JButtonjButton1;
privatejavax.swing.JButtonjButton2;
privatejavax.swing.JLabeljLabel1;
privatejavax.swing.JLabeljLabel2;
privatejavax.swing.JLabeljLabel3;
privatejavax.swing.JPaneljPanel1;
privatejavax.swing.JPasswordFieldjPasswordField1;
privatejavax.swing.JTextFieldjTextField1;
//Endofvariablesdeclaration//GEN-END:variables
}
⑨ 如何用JAVA編寫一個簡單用戶登陸界面
什麼都不說了 直接給你代碼吧
package com.moliying.ui;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.List;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Arrays;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class Login {
private JFrame frame = new JFrame("登錄");
private Container c = frame.getContentPane();
private JTextField username = new JTextField();
private JPasswordField password = new JPasswordField();
private JButton ok = new JButton("確定");
private JButton cancel = new JButton("取消");
public Login() {
frame.setSize(300, 200);
frame.setBounds(450, 300, 300, 200);
c.setLayout(new BorderLayout());
initFrame();
frame.setVisible(true);
}
private void initFrame() {
// 頂部
JPanel titlePanel = new JPanel();
titlePanel.setLayout(new FlowLayout());
titlePanel.add(new JLabel("系統管理員登錄"));
c.add(titlePanel, "North");
// 中部表單
JPanel fieldPanel = new JPanel();
fieldPanel.setLayout(null);
JLabel a1 = new JLabel("用戶名:");
a1.setBounds(50, 20, 50, 20);
JLabel a2 = new JLabel("密 碼:");
a2.setBounds(50, 60, 50, 20);
fieldPanel.add(a1);
fieldPanel.add(a2);
username.setBounds(110, 20, 120, 20);
password.setBounds(110, 60, 120, 20);
fieldPanel.add(username);
fieldPanel.add(password);
c.add(fieldPanel, "Center");
// 底部按鈕
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new FlowLayout());
buttonPanel.add(ok);
buttonPanel.add(cancel);
c.add(buttonPanel, "South");
ok.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(username.getText().toString());
}
});
cancel.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
frame.setVisible(false);
}
});
}
public static void main(String[] args) {
// new Login();
String ss = "abbabbbaabbbccba";
System.out.println(ss.split("b").length);
}
}
⑩ java登錄界面
應用的還是web的啊..
我給你寫了個應用的哈
你在C盤建個test.txt文件
裡面寫
username:用戶名（這里可以隨便寫哈）
password:同上哈
注意是要換行的哦。。
比如
username:tiger
password:tiger
然後你建個Login的類
然後把下面的代碼弄進去
運行就是了
注意登陸的時候你文件裡面設定的什麼用戶名和密碼就輸入什麼哈
輸入錯誤就會提示輸入錯誤的
import java.io.BufferedReader;
import java.io.FileReader;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
/**
*
* @author thinkpad
*/
public class Login extends javax.swing.JFrame {
/** Creates new form Login */
private static String username;
private static String password;
public Login() {
initComponents();
try {
BufferedReader br = new BufferedReader(new FileReader("C:\\test.txt"));
username = br.readLine().split("\\:")[1];
password = br.readLine().split("\\:")[1];
System.out.println(username + password);
} catch(Exception e) {
e.printStackTrace();
}
}
/** 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.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jPasswordField1 = new javax.swing.JPasswordField();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("宋體", 0, 18)); // NOI18N
jLabel1.setText("Login");
jLabel2.setText("Username:");
jLabel3.setText("Password:");
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
jPasswordField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
(evt);
}
});
jButton1.setText("Login");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Reset");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(28, 28, 28)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jLabel3))
.addGap(33, 33, 33)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jPasswordField1, 0, 0, Short.MAX_VALUE)
.addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 108, Short.MAX_VALUE)))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2))))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(101, 101, 101)
.addComponent(jLabel1)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 35, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2)))
);
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.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
private void (java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
this.jTextField1.setText("");
this.jPasswordField1.setText("");
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String inputUsername = this.jTextField1.getText();
String inputPassword = String.valueOf(this.jPasswordField1.getPassword());
if(inputUsername.equals(username) && inputPassword.equals(password)) {
JOptionPane.showMessageDialog(this, "Login success!");
} else {
JOptionPane.showMessageDialog(this, "Login failed!");
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame.(true);
Login login = new Login();
login.setVisible(true);
login.setLocationRelativeTo(null);
}
});
}
// 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.JPasswordField jPasswordField1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}