Java:简单的读写XML文件之使用DOM4J读写

Posted 2021-01-13

Dom4J方式解析XML文件。dom4j是非官方提供的xml文件解析方式，因此需要去第三方下载dom4j的jar包

File file = new File("D:\chengmuzhe\java\JavaOOP6.0\students.xml");
    SAXReader reader = new SAXReader();
    Document document = reader.read(file);
    Element root = document.getRootElement();
    try {
        System.out.println("学生信息:");
        for (Iterator iterator = root.elementIterator(); iterator.hasNext();) {
            Element element = (Element) iterator.next();
            String ids = element.elementText("stuId");

            System.out.println(ids);
            String names = element.elementText("stuName");
            System.out.println(names);
            String age = element.elementText("age");
            System.out.println(age);

        }
    } catch (Exception e) {
        // TODO: handle exception
    }

读XML是还有一种方法就是使用Document的selectNodes来查找节点

使用这个方法是需要另外的包

导入xPath支持的jar包。jaxen-1.1-beta-6.jar(首先要先导入dom4j包，dom4j下载地址：http://www.dom4j.org/dom4j-1.6.1/)。下载jdom时在解压后的lib下

---

List lists = document.selectNodes("//students");
        Iterator iter = lists.iterator();
        while (iter.hasNext()) {
            Element element = (Element) iter.next();
                String ids = element.elementText("stuId");

            System.out.println(ids);
            String names = element.elementText("stuName");
            System.out.println(names);
            String age = element.elementText("age");
            System.out.println(age);

    }

写XML

Document document = DocumentHelper.createDocument();
    Element element = document.addElement("students");
    Element studentElement = element.addElement("student");
    studentElement.addAttribute("email", "[email protected]");
    Element idElement = studentElement.addElement("stuId");
    idElement.setText("55");
    Element nameElement = studentElement.addElement("stuName");
    idElement.setText("55Name");
    Element ageElement = studentElement.addElement("age");
    ageElement.setText("55");
    try {
        XMLWriter output = new XMLWriter(new FileWriter(new File(
                "students2.xml")));
        output.write(document);
        output.close();
    } catch (IOException e) {
        System.out.println(e.getMessage());
    }