Question

我的情况是我必须在文本字段中扫描一个qrcode，我必须解析它与非printables字符（顺便说一下，它总是相同的字符），它们永远不会出现在相同的位置。

我尝试获取此代码但没有成功

textfield.getText（）失败
textfield.getDocument（）。getText（0，textfield.getDocument（）。getLength（））失败

我使用KeyBindings成功，然后用字形替换为@trashgod注释。

示例：

public class Test {

    private JPanel panel;
    private JTextArea textArea;

    public static final String GS_UNICODE = "\u241D";

    public Test(){
        panel = new JPanel();
        textArea = new JTextArea(10,30);
        final JTextField textfield = new JTextField(30);

        textfield.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_F8,0), "test");
        textfield.getActionMap().put("test", new AbstractAction(){

            @Override
            public void actionPerformed(ActionEvent e) {
                textfield.setText(textfield.getText()+GS_UNICODE);                
            }

        });



        textfield.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e) {                
                    textArea.setText(textfield.getText());                                   
            }
        });
        panel.add(textfield);
        JButton button = new JButton("Press non-readable");
        button.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    Robot robot = new Robot();
                    textfield.requestFocusInWindow();                    
                    robot.setAutoDelay(10);
                    robot.keyPress(KeyEvent.VK_F8);
                    robot.keyPress(KeyEvent.VK_H);
                    robot.keyPress(KeyEvent.VK_E);
                    robot.keyPress(KeyEvent.VK_L);
                    robot.keyPress(KeyEvent.VK_L);
                    robot.keyPress(KeyEvent.VK_O);
                    robot.keyPress(KeyEvent.VK_ENTER);  

                    SwingUtilities.invokeLater(new Runnable(){

                        @Override
                        public void run() {
                            //check if string has glyph
                           System.out.println(textfield.getText().contains(GS_UNICODE));
                           System.out.println(textfield.getText());
                        }

                    });

                } catch (AWTException ex) {
                    ex.printStackTrace();
                }

            }

        });
        panel.add(button);
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("DataMatrix example");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        frame.setLocationByPlatform(Boolean.TRUE);
        Test example =new Test();
        frame.add(example.panel,BorderLayout.CENTER);
        frame.add(example.textArea,BorderLayout.SOUTH);

        //Display the window.
        frame.pack();
        frame.setVisible(Boolean.TRUE);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }


}

但我的问题是：

1）有没有办法通过textcomponent（aka Document）的底层模型而不是KeyBinding捕获不可打印的ASCII代码（n <31和n = 127），而不是像textfield.setText(textfield.getText()+"myReplacement");这样的字形替换。例如，在带有正则表达式＆＃34; \ p {Cntrol}＆＃34;

的模型中

2）假设KeyBinding是正确的方法，如果我必须听所有不可打印的字符，是否有一种自动方式用其字形改变该代码？

ASCII textcomponent中的不可打印字符

0 个答案: