package com.whyc;
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import javax.swing.*;
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import java.awt.*;
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import java.awt.event.KeyAdapter;
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import java.awt.event.KeyEvent;
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/**
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* 密码输入界面，模拟命令行输入
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*/
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public class InputForm {
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//输入提示
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private static final String tips = " 项目正在启动，请输入启动密码\r\n Password: ";
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//密码显示字符
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private static final char passChar = '*';
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//窗口
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private JDialog frame;
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//文本域
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private JTextArea text;
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//已输入字符长度
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private int keyIndex = 0;
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//已输入的字符，最长100
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private char[] password = new char[100];
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//是否有下一行
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boolean hasNextLine = false;
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/**
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* 获取输入的密码
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*
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* @return 密码char数组
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*/
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public char[] nextPasswordLine() {
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while (!hasNextLine) {
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try {
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Thread.sleep(50);
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} catch (Exception e) {
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}
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}
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int charsSize = 0;
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while (password[charsSize] != 0) {
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charsSize++;
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}
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char[] chars = new char[charsSize];
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for (int i = 0; i < chars.length; i++) {
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chars[i] = password[i];
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}
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keyIndex = 0;
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password = new char[100];
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return chars;
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}
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/**
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* 显示窗口
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*
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* @return 显示是否成功
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*/
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public boolean showForm() {
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try {
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frame = new JDialog();
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frame.setTitle("项目启动密码 - ClassFinal");
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frame.setSize(560, 320);
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frame.setResizable(false);
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frame.setLocationRelativeTo(null);
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frame.setAlwaysOnTop(true);
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frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
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text = new JTextArea();
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text.setFont(new Font(null, 0, 18));
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text.setBackground(new Color(0, 0, 0));
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text.setForeground(new Color(0, 255, 0));
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text.setText(tips);
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text.addKeyListener(getKeyAdapter());
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text.enableInputMethods(false);
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frame.add(text);
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frame.setVisible(true);
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return true;
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} catch (Exception e) {
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return false;
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}
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}
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/**
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* 关闭窗口
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*/
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public void closeForm() {
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frame.setVisible(false);
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frame.dispose();
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}
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/**
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* 键盘监听事件
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*
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* @return KeyAdapter
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*/
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private KeyAdapter getKeyAdapter() {
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return new KeyAdapter() {
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String fakePass = "";
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@Override
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public void keyReleased(KeyEvent e) {
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if (keyIndex < 100 && e.getKeyChar() > 32 && e.getKeyChar() < 127) {
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password[keyIndex] = e.getKeyChar();
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keyIndex++;
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fakePass += passChar;
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} else if (keyIndex > 0 && e.getKeyCode() == 8) {//退格
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keyIndex--;
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password[keyIndex] = 0;
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fakePass = fakePass.substring(1);
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} else if (e.getKeyCode() == 10) {//ENTER
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fakePass = "";
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hasNextLine = true;
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}
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text.setText(tips + fakePass);
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}
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};
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}
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public static void main(String[] args) {
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InputForm input = new InputForm();
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boolean gui = input.showForm();
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if (gui) {
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System.out.println(input.nextPasswordLine());
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input.closeForm();
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}
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}
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}
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