1 XML文件创建示例
import java.io.File;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class CreateXML {
public static void main(String[] args) {
try {
//DOM
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.newDocument();
//创建Languages标签
Element root = document.createElement("Languages");
root.setAttribute("cat", "it"); //设置Languages标签的属性
//-----接下来创建Languages标签下的三个子标签lan1、lan2、lan3
//lan1
Element lan1 = document.createElement("lan"); //lan标签
lan1.setAttribute("id", "1");
Element name1 = document.createElement("name"); //name标签
name1.setTextContent("Java");
Element ide1 = document.createElement("ide"); //ide标签
ide1.setTextContent("Eclipse");
lan1.appendChild(name1); //name为lan的子标签
lan1.appendChild(ide1); //ide为lan的子标签
//同lan1
Element lan2 = document.createElement("lan");
lan2.setAttribute("id", "2");
Element name2 = document.createElement("name");
name2.setTextContent("Swift");
Element ide2 = document.createElement("ide");
ide2.setTextContent("Xcode");
lan2.appendChild(name2);
lan2.appendChild(ide2);
//同lan1
Element lan3 = document.createElement("lan");
lan3.setAttribute("id", "3");
Element name3 = document.createElement("name");
name3.setTextContent("C#");
Element ide3 = document.createElement("ide");
ide3.setTextContent("Visual Studio");
lan3.appendChild(name3);
lan3.appendChild(ide3);
root.appendChild(lan1); //lan1、lan2、lan3为root的子标签
root.appendChild(lan2);
root.appendChild(lan3);
document.appendChild(root); //root为document的子标签
//----输出
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
StringWriter writer = new StringWriter();
//文本输出
transformer.transform(new DOMSource(document), new StreamResult(writer));
System.out.println(writer.toString());
//转换成文件
transformer.transform(new DOMSource(document), new StreamResult(new File("languages.xml")));
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TransformerConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TransformerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
代码运行效果如下:
2 XML文件读取示例
import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class ReadXML {
public static void main(String[] args) {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new File("languages.xml"));
//根元素
Element root = document.getDocumentElement();
//lan标签
NodeList list = root.getElementsByTagName("lan");
for(int i=0;i<list.getLength();i++) {
Element lan = (Element) list.item(i);
System.out.println("--------------");
System.out.println("id="+lan.getAttribute("id")); //输出标签属性
//lan标签下的子标签
NodeList clist = lan.getChildNodes();
for (int j = 0; j < clist.getLength(); j++) {
Node c = clist.item(j);
if(c instanceof Element) { //节点为Element才输出,否则会读取到换行等
System.out.println(c.getNodeName()+"="+c.getTextContent());
}
}
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
代码运行效果:
3 Dom4j创建XML
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
public class TestDom4j {
public static void main(String[] args) {
String xmlstring = "<root><people>Hov</people></root>";
try {
Document document = DocumentHelper.parseText(xmlstring);
System.out.println(document.asXML());
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
代码运行效果: