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();   
        }    
    }   
}