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当前代码：https ://github.com/coldblade2000/QuizMaker/tree/Development XML 我制作的：http: //pastebin.com/FBHVsnPA

我正在为 android 制作一个 Quiz Maker 应用程序，但无法使用 XML 来存储数据。我制作了一个小的 XML 文件，我先用它来测试它。它有 1 个问题和 4 个可能答案的空间。

我无法理解如何向 XML 添加值和字符串、读取它等。我尝试了大多数 XML 和 android 教程，但大多数都没有谈论在其中使用变量或将自己的属性添加到元素. XML 对我来说真的很新，我只知道基本的 HTML 会得到我

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1 回答 1

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可用于读取和写入 XML 的 XML 的基本 Java API 是DOM StaX. 然而 DOM4J 可以更好，因为它有更简单的 API。

这是创建 XML 文档的简单方法

public void createXML() throws IOException {

    Document document = DocumentHelper.createDocument();
    Element rootElement = document.addElement("Students");
    Element studentElement = rootElement.addElement("student").addAttribute("country", "USA");
    studentElement.addElement("id").addText("1");
    studentElement.addElement("name").addText("Peter");
    XMLWriter writer = new XMLWriter(new FileWriter("Students.xml"));
    //Note that You can format this XML document
    /*
     * FileWriter output = new FileWriter(new File("Students.xml"));
    OutputFormat format = OutputFormat.createPrettyPrint();
    XMLWriter writer = new XMLWriter(output,format);<- will fomat the output
     */

    //You can print this to the console and see what it looks like
    String xmlElement = document.asXML();
    System.out.println(xmlElement);
    writer.write(document);
    writer.close();

}

并阅读 student.xml

public void readXML() throws SAXException, IOException,
        ParserConfigurationException, DocumentException {
    /*Integration with DOM 
    DOMReader reader = new DOMReader();
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document document = reader.read(builder.parse(new File("Students.xml")));
    */
    SAXReader readerSAX = new SAXReader();
    Document document2 = readerSAX.read(new File("Students.xml"));
    Element root = document2.getRootElement();
    Student student = null;
    List<Student> studentsList = new ArrayList<Student>();
    if (root.getName().equalsIgnoreCase("students")) {
        for (@SuppressWarnings("unchecked")
        Iterator<Student> i = root.elementIterator(); i.hasNext();) {
            Element element = (Element) i.next();
            if ("student".equalsIgnoreCase(element.getName())) {
                student = new Student();
                for (int j = 0, size = element.nodeCount(); j < size; j++) {
                    Node node = (Node) element.node(j);
                    if (node instanceof Element) {
                        if ("id".equalsIgnoreCase(node.getName())) {
                            student.setId(Integer.parseInt(node.getText()));
                        } else if ("name".equalsIgnoreCase(node.getName())) {
                            student.setName(node.getText());
                        }
                    }
                }
                studentsList.add(student);
            }
        }
    }
    for(Student stud : studentsList){
        System.out.println(stud);           
    }
}
于 2013-10-08T02:42:46.007 回答