Java:簡單的讀寫XML檔案之使用DOM4J讀寫
阿新 • • 發佈:2018-11-11
Dom4J方式解析XML檔案。dom4j是非官方提供的xml檔案解析方式,因此需要去第三方下載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("學生資訊:"); 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 }
讀XML是還有一種方法就是使用Document的selectNodes來查詢節點
使用這個方法是需要另外的包
匯入xPath支援的jar包。jaxen-1.1-beta-6.jar(首先要先匯入dom4j包,dom4j下載地址:http://www.dom4j.org/dom4j-1.6.1/)。下載jdom時在解壓後的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);
}
寫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());
}