讀xml文件：

xml文件內容：

Java

Eclipse

Swift

Xcode

C#

Visual Studio

代碼：

package XMLParse;

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 {

//DOM方式解析xml文件

DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();

DocumentBuilder builder=factory.newDocumentBuilder();

Document document=builder.parse(new File("languages.xml"));

Element root=document.getDocumentElement();

System.out.println("categary:"+root.getAttribute("cat"));

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"));

NodeList cList=lan.getChildNodes();//會將文件里的換行也當成子節點返回到cList中

for (int j = 0; j < cList.getLength(); j++) {

Node c= cList.item(j);

if(c instanceof Element) {//因為cList中包含了空格和換行，所以需要判斷是否是元素

System.out.println(c.getNodeName()+"="+c.getTextContent());

}

}

}

} catch (ParserConfigurationException e) {

e.printStackTrace();

} catch (SAXException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

注意：NodeList cList=lan.getChildNodes(); 會把原文件中的換行也當作子節點，所以需要判斷：if(c instanceof Element){……}

創建xml文件：

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.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 creaetXML {

public static void main(String[] args) {

try {

DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();

DocumentBuilder builder=factory.newDocumentBuilder();

Document document=builder.newDocument();

Element root=document.createElement("Languages");

root.setAttribute("cat", "IT");

Element lan1=document.createElement("lan");

lan1.setAttribute("id", "1");

Element name1=document.createElement("name");

name1.setTextContent("java");

Element ide1=document.createElement("ide");

ide1.setTextContent("eclipse");

lan1.appendChild(name1);

lan1.appendChild(ide1);

root.appendChild(lan1);

document.appendChild(root);

Element lan2=document.createElement("lan");

lan2.setAttribute("id", "2");

Element name2=document.createElement("name");

name2.setTextContent("c#");

Element ide2=document.createElement("ide");

ide2.setTextContent("visual studio");

lan2.appendChild(name2);

lan2.appendChild(ide2);

root.appendChild(lan2);

//*************以下為輸出**************

TransformerFactory transformerFactory=TransformerFactory.newInstance();

Transformer transformer=transformerFactory.newTransformer();

StringWriter writer=new StringWriter();

transformer.transform(new DOMSource(document), new StreamResult(writer));//輸出到控制臺

System.out.println(writer.toString());

transformer.transform(new DOMSource(document), new StreamResult(new File("newxml.xml")));

} catch (ParserConfigurationException e) {

e.printStackTrace();

} catch (TransformerException e) {

e.printStackTrace();

}

}

}

其中重點是如何輸出：

TransformerFactory transformerFactory=TransformerFactory.newInstance();

Transformer transformer=transformerFactory.newTransformer();

StringWriter writer=new StringWriter();

transformer.transform(new DOMSource(document), new StreamResult(writer));//輸出到控制臺

System.out.println(writer.toString());

transformer.transform(new DOMSource(document), new StreamResult(new File("newxml.xml")));

使用第三方庫dom4j操作xml數據：

package testDom4j;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.DocumentHelper;

public class testDom4j {

public static void main(String[] args) {

String xmlString="panghu";

try {

Document document=DocumentHelper.parseText(xmlString);

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

} catch (DocumentException e) {

e.printStackTrace();

}

}

}

效率高很多。

總結

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