通過使用 StaX 在 XML（游戲的字符串表）中查找元素“文本”來獲取元素“文本”

Question

到目前為止，我有辦法通過它的 ID 找到我想要的元素 SELECT 但我試過但無法獲得它的內容（消息）。

public static String GetText(String id) throws FileNotFoundException, XMLStreamException
{
    File file = new File("C:/Users/LENOVO/IdeaProjects/CasinoRoyale/src/Stringtable.xml");

    // Instance of the class which helps on reading tags
    XMLInputFactory factory = XMLInputFactory.newInstance();

    // Initializing the handler to access the tags in the XML file
    XMLEventReader eventReader = factory.createXMLEventReader(new FileReader(file));

    String text = "";

    // Checking the availability of the next tag
    while (eventReader.hasNext()) {
        XMLEvent xmlEvent = eventReader.nextEvent();
        Characters characters = xmlEvent.asCharacters();

        if (xmlEvent.isStartElement()) {
            StartElement startElement = xmlEvent.asStartElement();

            Iterator<Attribute> iterator = startElement.getAttributes();

            while (iterator.hasNext()) {
                Attribute attribute = iterator.next();
                QName name = attribute.getName();
                if ("id".equalsIgnoreCase(name.getLocalPart())) {

                    String currentId = String.valueOf(attribute.getValue());
                    if (currentId.equals(id))
                        text = characters.getData();
                    break;
                }
            }
        }
    }

    return text;

}

這就是方法，到目前為止它在 IDE 中沒有給出錯誤。

<?xml version="1.0" encoding="UTF-8"?>
<Stringtable>
    <GameHelper id="welcomeTo">Welcome to Casino Royale!</GameHelper>

</Stringtable>

這是我目前的短 Stringtable.xml。

System.out.println(UtilitiesGame.GetText("welcomeTo"));

我就是這樣稱呼它的，它會拋出這個異常：

Exception in thread "main" java.lang.ClassCastException: class com.sun.xml.internal.stream.events.StartDocumentEvent cannot be cast to class javax.xml.stream.events.Characters (com.sun.xml.internal.stream .events.StartDocumentEvent and javax.xml.stream.events.Characters are in module java.xml of loader 'bootstrap') at java.xml/com.sun.xml.internal.stream.events.DummyEvent.asCharacters(DummyEvent.java :115) 在 UtilitiesGame.GetText(UtilitiesGame.Z93F725A07423FE1C8 89F448B33D21F46Z:66) 在 GameHelper.(GameHelper.java:67) 在 CasinoRoyale.main(CasinoRoyale.java:7)

我想要的是給定 ID (welcomeTo) 我得到“歡迎來到皇家賭場！”

Answer 1

拋出異常是因為事件讀取器仍然指向 startElement。

如果您移動角色元素的實例化，您可以輕松修復它

Characters characters = xmlEvent.asCharacters();

這里修復

    public static String GetText(String id) throws FileNotFoundException, XMLStreamException
    {    
        File file = new File("C:/Users/LENOVO/IdeaProjects/CasinoRoyale/src/Stringtable.xml");

        // Instance of the class which helps on reading tags
        XMLInputFactory factory = XMLInputFactory.newInstance();

        // Initializing the handler to access the tags in the XML file
        XMLEventReader eventReader = factory.createXMLEventReader(new FileReader(file));

        String text = "";

        // Checking the availability of the next tag
        while (eventReader.hasNext()) {
            XMLEvent xmlEvent = eventReader.nextEvent();

            if (xmlEvent.isStartElement())
            {
                // Characters characters = xmlEvent.asCharacters();
                StartElement startElement = xmlEvent.asStartElement();
                Iterator<Attribute> iterator = startElement.getAttributes();
                while (iterator.hasNext())
                {
                    Attribute attribute = iterator.next();
                    QName name = attribute.getName();
                    if ("id".equalsIgnoreCase(name.getLocalPart()))
                    {
                        String currentId = String.valueOf(attribute.getValue());
                        if (currentId.equals(id))
                        {
                            Characters characters = (Characters) eventReader.nextEvent();
                            text = characters.getData();
                        }
                        break;
                    }
                }
            }

        }
        return text;
    }