JAVA解析XML的四种方法

XML文件：test.xml

<?xml version="1.0" encoding="UTF-8"?>
<employees>
    <employee>
        <name>name1</name>
        <sex>sex1</sex>
        <age>1</age>
    </employee>
    <employee>
        <name>name2</name>
        <sex>sex2</sex>
        <age>2</age>
    </employee>
</employees>
 

设定解析接口：XmlDocument.java

public interface XmlDocument {
    /**
     * 建立XML文档
     * @param fileName 文件全路径名称
     */
    public void createXml(String fileName);
    /**
     * 解析XML文档
     * @param fileName 文件全路径名称
     */
    public void parserXml(String fileName);
} 

方法一：DOM

public class DomDemo implements XmlDocument {
    private Document document;
    private String fileName;
    public void init() {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance();
            DocumentBuilder builder = factory.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("丁宏亮"));
        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 {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document document = db.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 (ParserConfigurationException e) {
            System.out.println(e.getMessage());
        } catch (SAXException e) {
            System.out.println(e.getMessage());
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }
} 

方法二：SAX

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
*
* SAX文档解析
*/
public class SaxDemo implements XmlDocument {
    public void createXml(String fileName) {
        System.out.println("<<"+fileName+">>");
    }   

    public void parserXml(String fileName) {
        SAXParserFactory saxfac = SAXParserFactory.newInstance();   

        try {
            SAXParser saxparser = saxfac.newSAXParser();
            InputStream is = new FileInputStream(fileName);
            saxparser.parse(is, new MySAXHandler());
        }
        catch (ParserConfigurationException e) {
            e.printStackTrace();
        }
        catch (SAXException e) {
            e.printStackTrace();
        }
        catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }   

}   

class MySAXHandler extends DefaultHandler {
    boolean hasAttribute = false;
    Attributes attributes = null;   

    public void startDocument() throws SAXException {
        System.out.println("文档开始打印了");
    }
    public void endDocument() throws SAXException {
        System.out.println("文档打印结束了");
    }
    public void startElement(String uri, String localName, String qName,Attributes attributes) throws SAXException {
        if (qName.equals("employees")) {
            return;
        }
        if (qName.equals("employee")) {
            System.out.println(qName);
        }
        if (attributes.getLength() > 0) {
            this.attributes = attributes;
            this.hasAttribute = true;
        }
    }
    public void endElement(String uri, String localName, String qName) throws SAXException {
        if (hasAttribute && (attributes != null)) {
            for (int i = 0; i < attributes.getLength(); i++) {
                System.out.println(attributes.getQName(0)  + attributes.getValue(0));
            }
        }
    }   

    public void characters(char[] ch, int start, int length) throws SAXException {
        System.out.println(new String(ch, start, length));
    }
}  

方法三：DOM4J

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 implements XmlDocument {   

    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("ddvip");
        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");
    }
}

方法四：JDOM

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;   

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;   

public class JDomDemo implements XmlDocument {
    public void createXml(String fileName) {
        Document document;
        Element  root;
        root=new Element("employees");
        document=new Document(root);
        Element employee=new Element("employee");
        root.addContent(employee);
        Element name=new Element("name");
        name.setText("ddvip");
        employee.addContent(name);
        Element sex=new Element("sex");
        sex.setText("m");
        employee.addContent(sex);
        Element age=new Element("age");
        age.setText("23");
        employee.addContent(age);
        XMLOutputter XMLOut = new XMLOutputter();
        try {
            XMLOut.output(document, new FileOutputStream(fileName));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }   

    public void parserXml(String fileName) {
        SAXBuilder builder=new SAXBuilder(false);
        try {
            Document document=builder.build(fileName);
            Element employees=document.getRootElement();
            List employeeList=employees.getChildren("employee");
            for(int i=0;i<employeeList.size();i++){
                Element employee=(Element)employeeList.get(i);
                List employeeInfo=employee.getChildren();
                for(int j=0;j<employeeInfo.size();j++){
                    System.out.println(((Element)employeeInfo.get(j)).getName()+":"+((Element)employeeInfo.get(j)).getValue());
                }
            }
        } catch (JDOMException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}