dom4j 读写xml文档

据悉dom4j在xml解析方面是性能最好的，hibernate等框架都使用它作为解析的工具
写了简单的dom4j的使用的demo，以备回忆，有些是dom4j的文挡里例子改编的
使用dom4j解析下面的xml文件

<?xml version="1.0" encoding="GB2312"?> 

<?xml-stylesheet type="text/xsl" href="students.xsl"?>

<students>
    <student sn="01">
        <name>张三</name>
        <age>18</age>
    </student>
    
    <student sn="02">
        <name>李四</name>
        <age>20</age>
    </student>
</students>

Parse.java

import java.io.File;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.ProcessingInstruction;
import org.dom4j.VisitorSupport;
import org.dom4j.io.SAXReader;

public class Parse {

	public static void main(String[] args) {
		SAXReader reader = new SAXReader();
		File file = new File("src/students.xml");
		try {
			Document doc = reader.read(file);
			doc.accept(new MyVistor());
		} catch (DocumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static class MyVistor extends VisitorSupport {
		public void visit(Attribute node) {
			System.out.println("Attibute:---" + node.getName() + "="
					+ node.getValue());
		}

		public void visit(Element node) {
			if (node.isTextOnly()) {
				System.out.println("Element:---" + node.getName() + "="
						+ node.getText());
			}else{
				System.out.println("--------" + node.getName() + "-------");
			}
		}

		@Override
		public void visit(ProcessingInstruction node) {
			// TODO Auto-generated method stub
			System.out.println("PI:"+node.getTarget()+" "+node.getText());
		}
	}
}

使用dom4j来将属性写入xml

import java.io.FileWriter;
import java.io.IOException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class DWriter {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			XMLWriter writer = new XMLWriter(new FileWriter("src/author.xml"));
			Document doc = createDoc();
			writer.write(doc);
			writer.close();

			// Pretty print the document to System.out
			// 設置了打印的格式,将读出到控制台的格式进行美化
			OutputFormat format = OutputFormat.createPrettyPrint();
			writer = new XMLWriter(System.out, format);
			writer.write(doc);

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static Document createDoc() {
		Document doc = DocumentHelper.createDocument();
		Element root = doc.addElement("root");
		Element author1 = root.addElement("author").addAttribute("name",
				"James").addAttribute("location", "UK")
				.addText("Jame Strachan");
		Element author2 = root.addElement("author").addAttribute("name", "Bob")
				.addAttribute("location", "US").addText("Bob McWrirter");
		return doc;
	}

}

使用dom4j写入到author.xml文件的内容

<?xml version="1.0" encoding="UTF-8"?>
<root><author name="James" location="UK">Jame Strachan</author><author name="Bob" location="US">Bob McWrirter</author></root>