java操作xml

代码都是来自于网上，稍微做了一下修改。

dom方式;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
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;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class DomDemo {
	private Document document;
	private static DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
	private static DocumentBuilder builder = null;

	public DomDemo() {
		init();
	}

	private void init() {
		try {
			builder = dbf.newDocumentBuilder();
			this.document = builder.newDocument();
		} catch (ParserConfigurationException e) {
			System.out.println(e.getMessage());
		}
	}

	public void createXml(String fileName) {
		Element root = this.document.createElement("employees");
		this.document.appendChild(root);
		Element employee = this.document.createElement("employee");
		Element name = this.document.createElement("name");
		name.appendChild(this.document.createTextNode("DomDemo"));
		employee.appendChild(name);
		Element sex = this.document.createElement("sex");
		sex.appendChild(this.document.createTextNode("m"));
		employee.appendChild(sex);
		Element age = this.document.createElement("age");
		age.appendChild(this.document.createTextNode("30"));
		employee.appendChild(age);
		root.appendChild(employee);
		TransformerFactory tf = TransformerFactory.newInstance();
		try {
			Transformer transformer = tf.newTransformer();
			DOMSource source = new DOMSource(document);
			transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312");
			transformer.setOutputProperty(OutputKeys.INDENT, "yes");
			PrintWriter pw = new PrintWriter(new FileOutputStream(fileName));
			StreamResult result = new StreamResult(pw);
			transformer.transform(source, result);
			System.out.println("生成XML文件成功!");
		} catch (TransformerConfigurationException e) {
			System.out.println(e.getMessage());
		} catch (IllegalArgumentException e) {
			System.out.println(e.getMessage());
		} catch (FileNotFoundException e) {
			System.out.println(e.getMessage());
		} catch (TransformerException e) {
			System.out.println(e.getMessage());
		}
	}

	public void parserXml(String fileName) {
		try {
			Document document = builder.parse(fileName);
			NodeList employees = document.getChildNodes();
			for (int i = 0; i < employees.getLength(); i++) {
				Node employee = employees.item(i);
				NodeList employeeInfo = employee.getChildNodes();
				for (int j = 0; j < employeeInfo.getLength(); j++) {
					Node node = employeeInfo.item(j);
					NodeList employeeMeta = node.getChildNodes();
					for (int k = 0; k < employeeMeta.getLength(); k++) {
						System.out.println(employeeMeta.item(k).getNodeName() + ":" + employeeMeta.item(k).getTextContent());
					}
				}
			}
			System.out.println("解析完毕");
		} catch (FileNotFoundException e) {
			System.out.println(e.getMessage());
		} catch (SAXException e) {
			System.out.println(e.getMessage());
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
	}

	public static void main(String[] args) {
		DomDemo dom = new DomDemo();
		String fileName = "d:/DomDemo.xml";
		dom.createXml(fileName);
		dom.parserXml(fileName);
	}
}

SAX方式：

import java.io.File;
import java.util.Vector;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

public class SAXDemo extends DefaultHandler {

	private Vector<String> tagName;

	private Vector<String> tagValue;

	private int step;

	// 开始解析XML文件
	public void startDocument() throws SAXException {
		tagName = new Vector<String>();
		tagValue = new Vector<String>();
		step = 0;
	}

	// 结束解析XML文件
	public void endDocument() throws SAXException {
		for (int i = 0; i < tagName.size(); i++) {
			if (!tagName.get(i).equals("") || tagName.get(i) != null) {
				System.out.println("节点名称：" + tagName.get(i));
				System.out.println("节点值：" + tagValue.get(i));
			}
		}
	}

	/**
	 * 在解释到一个开始元素时会调用此方法.但是当元素有重复时可以自己写算法来区分 这些重复的元素.qName是什么? <name:page
	 * ll=""></name:page>这样写就会抛出SAXException错误 通常情况下qName等于localName
	 */
	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
		// 节点名称
		tagName.add(qName);
		// 循环输出属性
		for (int i = 0; i < attributes.getLength(); i++) {
			// 获取属性名称
			System.out.println("属性名称：" + attributes.getQName(i));
			// 获取属性值
			System.out.println("属性值：" + attributes.getValue(attributes.getQName(i)));
		}

	}

	/**
	 * 在遇到结束标签时调用此方法
	 */
	public void endElement(String uri, String localName, String qName) throws SAXException {

		step = step + 1;
	}

	/**
	 * 读取标签里的值,ch用来存放某行的xml的字符数据,包括标签,初始大小是2048, 每解释到新的字符会把它添加到char[]里。 *
	 * 注意,这个char字符会自己管理存储的字符, 并不是每一行就会刷新一次char,start,length是由xml的元素数据确定的,
	 * 暂时找不到规律,以后看源代码.
	 * 
	 * 这里一个正标签，反标签都会被执行一次characters，所以在反标签时不用获得其中的值
	 */
	public void characters(char ch[], int start, int length) throws SAXException {
		// 只要当前的标签组的长度一至，值就不赋，则反标签不被计划在内
		if (tagName.size() - 1 == tagValue.size()) {
			tagValue.add(new String(ch, start, length));
		}
	}

	public static void main(String[] args) {
		String filename = "d:/SAXDemo.xml";
		SAXParserFactory spf = SAXParserFactory.newInstance();
		try {
			SAXParser saxParser = spf.newSAXParser();
			saxParser.parse(new File(filename), new SAXDemo());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

dom4j方式：

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class Dom4jDemo {

	public void createXml(String fileName) {
		Document document = DocumentHelper.createDocument();
		Element employees = document.addElement("employees");
		Element employee = employees.addElement("employee");
		Element name = employee.addElement("name");
		name.setText("Dom4jDemo");
		Element sex = employee.addElement("sex");
		sex.setText("m");
		Element age = employee.addElement("age");
		age.setText("29");
		try {
			Writer fileWriter = new FileWriter(fileName);
			XMLWriter xmlWriter = new XMLWriter(fileWriter);
			xmlWriter.write(document);
			xmlWriter.close();
		} catch (IOException e) {

			System.out.println(e.getMessage());
		}

	}

	public void parserXml(String fileName) {
		File inputXml = new File(fileName);
		SAXReader saxReader = new SAXReader();
		try {
			Document document = saxReader.read(inputXml);
			Element employees = document.getRootElement();
			for (Iterator<?> i = employees.elementIterator(); i.hasNext();) {
				Element employee = (Element) i.next();
				for (Iterator<?> j = employee.elementIterator(); j.hasNext();) {
					Element node = (Element) j.next();
					System.out.println(node.getName() + ":" + node.getText());
				}

			}
		} catch (DocumentException e) {
			System.out.println(e.getMessage());
		}
		System.out.println("dom4j parserXml");
	}
	
	public static void main(String[] args) {
		Dom4jDemo dom4j = new Dom4jDemo();
		String fileName = "d:/Dom4jDemo.xml";
		dom4j.createXml(fileName);
		dom4j.parserXml(fileName);
	}
}

jdom方式：

import java.io.FileOutputStream;
import java.io.IOException;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
import org.jdom.xpath.XPath;

public class JDomDemo {

	public void createXml(String fileName) {
		Document doc = new Document();
		Element employees = new Element("employees");
		doc.setRootElement(employees);
		
		Element employee = new Element("employee");
		Element name = new Element("name");
		name.setText("JDomDemo");
		
		employees.addContent(employee);
		employee.addContent(name);
		name.setAttribute("attr", "a");
		
		XMLOutputter xmlOut = new XMLOutputter();
		Format fmt = Format.getPrettyFormat();
		fmt.setIndent("    ");// 四个空格
		fmt.setEncoding("gb2312");
		xmlOut.setFormat(fmt);
		
		FileOutputStream out = null;
		try {
			out = new FileOutputStream(fileName);
			xmlOut.output(doc, out);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public void parserXml(String fileName) {
		SAXBuilder sax = new SAXBuilder();
		try {
			Document doc = sax.build(fileName);
			Element rootEle = doc.getRootElement();
			Element nameElement = (Element) XPath.selectSingleNode(rootEle, "/employees/employee/name");
			String name = nameElement.getText();
			System.out.println("name = " + name);
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		JDomDemo jDomDemo = new JDomDemo();
		String fileName = "d:/JDomDemo.xml";
		jDomDemo.createXml(fileName);
		jDomDemo.parserXml(fileName);
	}

}

另外，还有其他的方式，比如xstream等。