dom4j对于xml文件的操作

• 1. 引入jar包
• dom4j-1.6.jar
• jaxen-1.1-beta-8.jar
• 
  
• 2. 代码
• package test;
• 
  
• import java.io.ByteArrayOutputStream;
• 
  
• public class XMLTest {
  • public static Document loadFile(String path) throws Exception {
  • SAXReader saxReader = new SAXReader();
  • Document document = saxReader.read(new File(XMLTest.class.getResource(path).getFile()));
  • return document;
• }
• 
  
• public static void writeFile(Document document, String path) throws Exception {
  • OutputFormat format = OutputFormat.createPrettyPrint();
  • format.setEncoding("UTF8");
  • File file = new File(XMLTest.class.getResource(path).getFile());
  • if(file.exists()) 
  • file.delete();
  • XMLWriter writer = new XMLWriter(new FileWriter("src//test//" + path), format);
  • writer.write(document);
  • writer.close();
• }
• 
  
• // 创建xml
• public static void createXml() throws Exception {
  • Document document = DocumentHelper.createDocument();
  • Element configElement = document.addElement("config");
  • configElement.addComment("config-content");
  • Element ftpElement = configElement.addElement("ftp");
  • ftpElement.addAttribute("name", "name1");
  • ftpElement.addElement("host1").setText("127.0.0.1");
  • ftpElement.addElement("host2").setText("127.0.0.1");
  • ftpElement.addElement("port").setText("21");
  • 
    
  • writeFile(document, "xmlTest.xml");
• }
• 
  
• // 查看内容
• public static void showXML(String path) throws Exception {
  • Document document = loadFile(path);
  • ByteArrayOutputStream out = new ByteArrayOutputStream();
  • OutputFormat format = new OutputFormat("", true, "UTF8");
  • XMLWriter write = new XMLWriter(out, format);
  • write.write(document);
  • String s = out.toString("UTF8");
  • System.out.println(s);
• }
• 
  
• // 查看结点内容
• public static void showXMLNode(String path) throws Exception {
  • Document document = loadFile(path);
  • Element root = document.getRootElement();
  • System.out.println(root.asXML()); //查看根节点下的所有数据
  • List list = root.selectNodes("/config/ftp");
  • System.out.println(list.size());
  • for (int i = 0; i < list.size(); ++i) {
    • Element element = (Element) list.get(i);
    • System.out.println(element.attributeValue("name"));
  • }
• }
• // 修改或删除结点
• public static void changeAndDelete(String path) throws Exception {
  • Document document = loadFile(path);
  • Element root = document.getRootElement();
  • Element ftpElement = (Element) root.selectSingleNode("/config/ftp");
  • Element host1Element = (Element) ftpElement.selectSingleNode("host1");
  • System.out.println(host1Element.asXML());
  • host1Element.setText("127.1.1.1");
  • System.out.println(ftpElement.remove(host1Element)); // 可以删除结点，也可以删除属性
  • writeFile(document, path);  // 必须要重写
• }
• 
  
• public static void main(String[] args) throws Exception {
  • // createXml();
  • // showXML("xmlTest.xml");
  • // showXMLNode("xmlTest.xml");
  • changeAndDelete("xmlTest.xml");
• }
• }