java - 重新加载 xml 文件后重新加载 GUI

Question

我正在尝试创建 gui，它在重新加载 XML 文件后更改其部分元素(应用程序在启动时根据 XML 文件的内容创建一些 GUI 元素)。

启动应用程序后一切正常(如果加载 test.xml，则创建 20 个按钮 [10 个单词翻译对]；如果加载 testTwo.xml，则创建 4 个按钮 [2 个单词翻译对])，但我不这样做了解之后如何重新加载或随机播放 GUI 内容(单击按钮后)。

我尝试过将 revalidate();在 ActionListener 中，但它在我的应用程序中不起作用。

如果您能为我指明如何执行此操作的正确方向，我将很高兴。

GUI:XmlGui.java

package xmltest;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import net.miginfocom.swing.MigLayout;
import org.xml.sax.SAXException;

public class XmlGui extends JFrame {

    protected JPanel panel;
    protected JFrame frame;
    protected File file = new File("src/xmltest/test.xml");
    protected JButton setOne, setTwo, shuffle;
    protected JTextArea text;
    protected XmlTest engine;

    public XmlGui() throws ParserConfigurationException, SAXException, IOException {

        XmlEvent xmlEvent = new XmlEvent(this);

        SAXParserFactory spfac = SAXParserFactory.newInstance();
        SAXParser sp = spfac.newSAXParser();
        XmlTest engine = new XmlTest();
        sp.parse(file, engine);
        engine.readList();
        engine.shuffleList(1);

        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new FlowLayout());

        panel = new JPanel(new MigLayout("Insets 0"));

        setOne = new JButton("Default (test.xml)");
        setOne.addActionListener(xmlEvent);
        panel.add(setOne, "split 3");

        setTwo = new JButton("Next set (testTwo.xml)");
        setTwo.addActionListener(xmlEvent);
        panel.add(setTwo);

        shuffle = new JButton("Shuffle");
        shuffle.addActionListener(xmlEvent);
        panel.add(shuffle, "wrap");

        for (int i = 0; i < engine.cardList.size(); i++) {

            JPanel xpanel = new JPanel(new MigLayout("Insets 0"));
            final String test = engine.cardList.get(i).getTextOne();
            JButton word = new JButton(engine.cardList.get(i).getWord()+" ("+i+")");
            word.setPreferredSize(new Dimension(200, 40));
            word.addActionListener(new ActionListener(){
                public void ActionListener(ActionEvent event) {

                }

                @Override
                public void actionPerformed(ActionEvent e) {
                    text.setText(test);
                }
            });

            JButton translation = new JButton(engine.cardList.get(i).getTranslation()+" ("+i+") ");
            translation.setName("translation"+i);
            translation.setPreferredSize(new Dimension(200, 40));

            xpanel.add(word);
            xpanel.add(translation);
            panel.add(xpanel, "wrap");

        }

        text = new JTextArea();
        text.setLineWrap(true);
        text.setPreferredSize(new Dimension(400, 45));
        panel.add(text);

        frame.add(panel);
        frame.pack();
        frame.setVisible(true);

    }

    public static void main(String[] arguments) throws ParserConfigurationException, SAXException, IOException {

        XmlGui gui = new XmlGui();

    }

}

XML 方法:XmlTest.java

package xmltest;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;

import javax.xml.parsers.ParserConfigurationException;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class XmlTest extends DefaultHandler {

       Card card;
       private String temp;
       ArrayList<Card> cardList = new ArrayList<Card>();

       public void characters(char[] buffer, int start, int length) {
              temp = new String(buffer, start, length);
       }


       public void startElement(String uri, String localName,
                     String qName, Attributes attributes) throws SAXException {
              temp = "";
              if (qName.equalsIgnoreCase("Card")) {
                     card = new Card();

              }
       }

       public void endElement(String uri, String localName, String qName)
                     throws SAXException {

              if (qName.equalsIgnoreCase("Card")) {
                     cardList.add(card);

              } else if (qName.equalsIgnoreCase("Word")) {
                     card.setWord(temp);
              } else if (qName.equalsIgnoreCase("Translation")) {
                     card.setTranslation(temp);
              } else if (qName.equalsIgnoreCase("TextOne")) {
                     card.setTextOne(temp);
              } else if (qName.equalsIgnoreCase("TextTwo")) {
                     card.setTextTwo(temp);
              }

       }

       public void readList() {
              System.out.println("Number of cards in the collection: " + cardList.size()  + ".\n");
              Iterator<Card> it = cardList.iterator();
              while (it.hasNext()) {
                     System.out.println(it.next().toString());
              }
       }

       public void shuffleList(int x) {
              System.out.println("Shuffled cards order ("+x+"): ");
              Collections.shuffle(cardList);
              Iterator<Card> it = cardList.iterator();
              while (it.hasNext()) {
                     System.out.print(it.next().shuffledList());
              }
              System.out.println("\n");
       }

}

事件类:XmlEvent.java

package xmltest;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

public class XmlEvent implements ActionListener {

        XmlGui xmlGui;

        XmlEvent (XmlGui in) {

        xmlGui = in;
    }


    @Override
    public void actionPerformed(ActionEvent e) {

        Object source = e.getSource();

        if (source.equals(xmlGui.setOne)) {

            xmlGui.file = new File("src/xmltest/test.xml");
            xmlGui.text.setText("test.xml");

        }

        if (source.equals(xmlGui.setTwo)) {

            xmlGui.file = new File("src/xmltest/testTwo.xml");
            xmlGui.text.setText("testTwo.xml");

        }

        if (source.equals(xmlGui.shuffle)) {

            xmlGui.text.setText("Shuffling list!");

        }

    }

}

XML 数据的表示:Card.java

package xmltest;

public class Card {

       private String word;
       private String translation;
       private String textOne;
       private String textTwo;

       public Card() {
       }

       public Card(String word, String translation, String textOne, String textTwo) {
              this.word = word;
              this.translation = translation;
              this.textOne = textOne;
              this.textTwo = textTwo;
       }

       public String getWord() {
              return word;
       }

       public void setWord(String word) {
              this.word = word;
       }

       public String getTranslation() {
              return translation;
       }

       public void setTranslation(String translation) {
              this.translation = translation;
       }

       public String getTextOne() {
              return textOne;
       }

       public void setTextOne(String textOne) {
              this.textOne = textOne;
       }

       public String getTextTwo() {
              return textTwo;
       }

       public void setTextTwo(String textTwo) {
              this.textTwo = textTwo;
       }

       public String toString() {
              StringBuffer sb = new StringBuffer();
              sb.append("Card details:");
              sb.append("\nWord: " + getWord());
              sb.append("\nTranslation: " + getTranslation());
              sb.append("\nTextOne: " + getTextOne());
              if(getTextTwo().equals("blank")) {
                  sb.append("\n\n");
              } else {
              sb.append("\nTextTwo: " + getTextTwo()+"\n\n");
              }

              return sb.toString();
       }

       public String shuffledList() {
           return getWord()+" ";
       }
}

XML1:test.xml

<?xml version="1.0" encoding="UTF-8"?>
<cards>
    <card>
        <word>cloud</word>
        <translation>chmura</translation>
        <textOne>D: a visible collection of particles of water or ice suspended in the air.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>rain</word>
        <translation>deszcz</translation>
        <textOne>D: water that is condensed from the aqueous vapor in the atmosphere and falls to earth in drops.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>wind</word>
        <translation>wiatr</translation>
        <textOne>D: air in natural motion, as that moving horizontally at any velocity along the earth's surface.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>storm</word>
        <translation>burza</translation>
        <textOne>D: a disturbance of the normal condition of the atmosphere, manifesting itself by winds of unusual force or direction, often accompanied by rain, snow, hail, thunder, and lightning, or flying sand or dust.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>blizzard</word>
        <translation>zamieć</translation>
        <textOne>D: a storm with dry, driving snow, strong winds, and intense cold.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>fog</word>
        <translation>mgła</translation>
        <textOne>D: a cloudlike mass or layer of minute water droplets or ice crystals near the surface of the earth, appreciably reducing visibility.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>sunny</word>
        <translation>słoneczny</translation>
        <textOne>D: abounding in sunshine.</textOne>
        <textTwo>test</textTwo>
    </card>
    <card>
        <word>weather</word>
        <translation>pogoda</translation>
        <textOne>D: the state of the atmosphere with respect to wind, temperature, cloudiness, moisture, pressure, etc.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>temperature</word>
        <translation>temperatura</translation>
        <textOne>D: a measure of the warmth or coldness of an object or substance with reference to some standard value.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>hail</word>
        <translation>grad</translation>
        <textOne>D: showery precipitation in the form of irregular pellets or balls of ice.</textOne>
        <textTwo>blank</textTwo>
    </card>
</cards>

XML2:testTwo.xml

<?xml version="1.0" encoding="UTF-8"?>
<cards>
    <card>
        <word>cloud</word>
        <translation>chmura</translation>
        <textOne>D: a visible collection of particles of water or ice suspended in the air.</textOne>
        <textTwo>blank</textTwo>
    </card>
    <card>
        <word>rain</word>
        <translation>deszcz</translation>
        <textOne>D: water that is condensed from the aqueous vapor in the atmosphere and falls to earth in drops.</textOne>
        <textTwo>blank</textTwo>
    </card>
</cards>

Answer 1

我通过以下方式解决了我的问题:

1. 将JButton从XML创建机制移至其自己的方法(在将其放置在创建整个GUI的方法中之前；
2. 通过方法为根据XML数据生成的JButton设置新的JPanel；
3. 在为新文件调用方法之前，使用 ActionListener 中的 JButton 调用 JPanel 的 removeAll() 来加载新的 XML 文件 JButton。

效果很好。