读写xml笔记

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读写xml

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.util.Iterator;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Element;

import org.dom4j.Node;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

public class TestReadXml {

public static String getClassPath() {

return XmlParser.class.getClass().getResource("/").toString();

}

public static void ff() {

File f2 = new File(XmlParser.class.getResource("").getPath());

System. out.println(f2);

}

public static void main(String[] args) {

try {

SAXReader reader = new SAXReader();

String xmlPath = System. getProperty("user.dir") + "\\src\\test\\java\\test.xml" ;

File file = new File(xmlPath);

if (file.exists()) {

Document document = reader.read(file);

Element root = document.getRootElement();

// 根据节点名获取节点

System. out.println(root.element("login" ).getTextTrim());

// 遍历节点

for (Iterator i = root.elementIterator(); i.hasNext();) {

Element element = (Element) i.next();

System. out.println(element.asXML());

}

// 根据xpath 根据节点名，节点属性查找指定的节点

System. out.println("----------------------获取指定节点的值----------------------------------" );

List<Node> node1 = root.selectNodes("//p[@id='hehe']");

for (Node n : node1) {

System. out.println(n.getName());

System. out.println(n.getText());

}

System. out.println("----------------------精确查找----------------------------------" );

// 精确查找

List<Node> node2 = root.selectNodes("//div/p[@id='hi']");

for (Node n : node2) {

System. out.println(n.getName());

System. out.println(n.getText());

}

// hh 为xml节点名

Element hh = root.element( "hh");

System. out.println("---------------------获取父节点的名字-----------------------" );

// 获取父节点

System. out.println(hh.getParent().getName());

// 设置节点的值

hh.setText( "21");

System. out.println(hh.getText());

// 写入文件

OutputFormat format = OutputFormat.createPrettyPrint();

format.setEncoding( "utf-8");

XMLWriter writer = new XMLWriter(new FileWriter(xmlPath), format);

writer.write(document);

writer.close();

* //获取子节点 System.out.println(hh.getNodeType());

* System.out.println(hh.getData());

* System.out.println(hh.getName());

* System.out.println(hh.getText());

* System.out.println(hh.getTextTrim()); hh.setText("21");

* System.out.println(hh.getTextTrim());

}

} catch (DocumentException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

//参考网址:http://berdy.iteye.com/blog/807883

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