如何用java圖形化介面實現一個登入視窗
阿新 • • 發佈:2019-01-30
登入視窗一般很常見,現在讓我們自己也來寫一個吧!
PS:很多import是重複的,是因為我是分了幾個類寫的,必須單獨匯入
//模擬qq登入視窗
import java.awt.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
public class QQGUI extends JFrame implements ActionListener{
private JLabel userLa;
private JLabel pwdLa;
private JLabel verCodeLa;//驗證碼
private JTextField userTxt;
private JPasswordField pwdTxt;
private JTextField verCodeTxt;//驗證碼
private JButton sureBt;
private JButton quitBt;
private Mypanel mp;
//構造方法
public QQGUI()
{
Init();
}
public void Init()
{
Frame frame = new Frame("QQ登入" );
//創建出控制元件物件(因為上面只是宣告出來,並沒有給出實際的空間)
//使用者文字
userLa = new JLabel();
userLa.setText("使用者名稱:");
userLa.setSize(60, 50);
userLa.setLocation(100, 80);
//密碼文字
pwdLa = new JLabel();
pwdLa.setText("密碼:");
pwdLa.setSize(50, 50);
pwdLa.setLocation(100 , 120);
//使用者輸入框
userTxt = new JTextField();
userTxt.setSize(100, 20);
//this.setSize(width, height)
userTxt.setLocation(170, 95);
//密碼輸入框
pwdTxt = new JPasswordField();
pwdTxt.setSize(100, 20);
pwdTxt.setLocation(170, 135);
//確認按鈕
sureBt = new JButton("登入");
sureBt.setSize(60, 25);
sureBt.setLocation(135, 260);
//退出按鈕
quitBt = new JButton("退出");
quitBt.setSize(60, 25);
quitBt.setLocation(240, 260);
//驗證碼文字
verCodeLa = new JLabel();
verCodeLa.setText("驗證碼:");
verCodeLa.setSize(60, 50);
verCodeLa.setLocation(100,165);
//驗證碼文字框
verCodeTxt = new JTextField();
verCodeTxt.setSize(100, 20);
verCodeTxt.setLocation(170, 180);
//驗證碼
mp = new Mypanel();
mp.setSize(100, 30);
mp.setLocation(280, 175);
//登入方式選擇框
JComboBox xlk=new JComboBox();
xlk.setSize(60, 20);
xlk.setLocation(250, 220);
xlk.addItem("線上");
xlk.addItem("隱身");
xlk.addItem("離開");
this.setLayout(null);
this.setSize(500, 400);
this.add(userLa);
this.add(pwdLa);
this.add(userTxt);
this.add(pwdTxt);
this.add(sureBt);
this.add(quitBt);
this.add(verCodeLa);
this.add(verCodeTxt);
this.add(mp);
this.add(xlk);
sureBt.addActionListener(this);
quitBt.addActionListener(this);
this.setVisible(true);
}
//具體事件的處理
public void actionPerformed(ActionEvent e)
{
//獲取產生事件的事件源強制轉換
JButton bt = (JButton)e.getSource();
//獲取按鈕上顯示的文字
String str = bt.getText();
if(str.equals("登入"))
{
if(!CheckIsNull())
{
//獲取使用者所輸入的使用者名稱
String user = userTxt.getText().trim();
//獲取使用者所輸入的密碼
String pwd = pwdTxt.getText().trim();
if(checkUserAndPwd(user,pwd))
{
//隱藏當前登入視窗
this.setVisible(false);
//驗證成功建立一個主視窗
MainFrame frame = new MainFrame();
}
else
{
//如果錯誤則彈出一個顯示框
JOptionPane pane = new JOptionPane("使用者或密碼錯誤");
JDialog dialog = pane.createDialog(this,"警告");
dialog.show();
}
}
}
else
{
//呼叫系統類中的一個正常退出
System.exit(0);
}
}
private boolean CheckIsNull()
{
boolean flag = false;
if(userTxt.getText().trim().equals(" "))
{
flag = true;
}
else
{
if(pwdTxt.getText().trim().equals(" "))
{
flag = true;
}
}
return flag;
}
private boolean checkUserAndPwd(String user,String pwd)
{
boolean result = false;
try
{
FileReader file = new FileReader("D:\\Workspaces\\MyEclipse 8.5\\testGUI.txt");
BufferedReader bre = new BufferedReader(file);
String str = bre.readLine();
while(str!=null)
{
String[] strs = str.split(",");
if(strs[0].equals(user))
{
if(strs[1].equals(pwd))
result = true;
}
str = bre.readLine();
}
file.close();
}catch(Exception ex)
{
System.out.print("");
}
return result;
}
}
//MainFrame類
import javax.swing.*;
public class MainFrame extends JFrame {
public MainFrame()
{
this.setSize(300, 300);
this.setVisible(true);
}
}
//驗證碼的生成
import java.awt.*;
import java.util.*;
public class Mypanel extends Panel {
public void paint(Graphics g)
{
int height = 50;
int width = 90;
//驗證碼框背景顏色
g.setColor(Color.LIGHT_GRAY);
//填充驗證碼背景
g.fillRect(0, 0, width, height);
g.setColor(Color.BLACK);
g.drawRect(0, 0, width-1, height-1);
Random r = new Random();
//設定干擾點
for(int i = 0;i<100;i++)
{
int x = r.nextInt(width)-1;
int y = r.nextInt(height)-1;
g.drawOval(x, y, 2, 2);
}
g.setFont(new Font("黑體",Font.BOLD,20));//設定驗證碼字型以及大小
g.setColor(Color.RED);//設定驗證碼字型顏色
//生成隨機驗證碼
char[] tmp = ("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
StringBuilder sb = new StringBuilder();
for(int i = 0;i<4;i++)
{
int pos = r.nextInt(tmp.length);
char c = tmp[pos];
sb.append(c + " ");
}
g.drawString(sb.toString(), 10, 15);//寫入驗證碼
}
}
//下拉框的實現
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class xialakuang extends JFrame {
private JComboBox comboBox;//定義一個組合框
public void xia ()
{
//JPanel panel = new JPanel();//建立一個JPanel面板
comboBox = new JComboBox();
comboBox.addItem("線上");
comboBox.addItem("隱身");
comboBox.addItem("離開");
this.add(comboBox);
//this.add(panel);
this.setSize(200, 100);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
}
//測試
public class testQQGUI {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
QQGUI frame = new QQGUI();
}
}