Dom4j学习笔记

下面的代码是在网上查找的，然后自己对照别人的在本地运行了一下，觉得很不错，所以就发布出来，版权不归本人

 

附件中有我运行的工程，可以直接测试

 

package hb.java;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.util.Iterator;import java.util.List;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class Dom4jDemo {/* * 建立一个xml文件，文件的名称由输入参数决定 * @param filename 需要建立的文件名 * @return 返回操作结果，0表示失败，1表示成功 */public int createXMLFile(String filename){int returnValue = 0;//创建一个Document对象，即根节点Document doc = DocumentHelper.createDocument();doc.addComment("comment 1");//在doc元素下面添加一个Element对象Element booksElement = doc.addElement("books");//在booksElement节点下面添加一个Element对象Element bookElement = booksElement.addElement("book");//给bookElement节点添加一个属性show=yesbookElement.addAttribute("show", "yes");//给bookElement对象下面添加一个Element对象Element titleElement = bookElement.addElement("title");//titleElement对象的文本节点的值为Dom4j TutorialstitleElement.setText("Dom4j Tutorials");bookElement = booksElement.addElement("book");bookElement.addAttribute("show", "yes");titleElement = bookElement.addElement("title");titleElement.setText("Lucene Studing");bookElement = booksElement.addElement("book");bookElement.addAttribute("show", "no");titleElement = bookElement.addElement("title");titleElement.setText("Lucene in action");booksElement.addComment("i am booksElement's commons");Element ownerElement = booksElement.addElement("owner");ownerElement.setText("huangbiao");try{//创建一个XMLWriter对象，封装了对Document写的操作XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));writer.write(doc);//关闭数据流writer.close();returnValue = 1;}catch(Exception e){e.printStackTrace();}return returnValue;}/* * 修改xml文件中的内容，并另存为一个新文件 * @param filename修改对象文件 * @param newfilename 修改后另存为该文件 * @return 返回操作结果，0表示失败，1表示成功 */public int modifyXMLFile(String filename,String newfilename){int returnValue = 0;try {SAXReader saxReader = new SAXReader();Document doc = saxReader.read(new File(filename));//使用下面的方法一定要引用jaxen.jar包，否则页面会抛异常，查询book元素属性为show的结果集合List list = doc.selectNodes("/books/book/@show");Iterator it = list.iterator();while(it.hasNext()){Attribute attr = (Attribute)it.next();if(attr.getValue().equals("yes")){attr.setValue("no");}}/* * 把owner项内容改为Tshinghua,并在owner节点中加入date节点，内容为2004-9-11,还为date节点添加一个参数type *///查询books元素的子元素owner的节点list = doc.selectNodes("/books/owner");it = list.iterator();if(it.hasNext()){Element ownerElement = (Element)it.next();ownerElement.setText("Tshinghua");Element dateElement = ownerElement.addElement("date");dateElement.setText("2004-9-11");dateElement.addAttribute("type", "huangbiao");}/** 修改内容之三: 若title内容为Dom4j Tutorials,则删除该节点 */list = doc.selectNodes("books/book");it = list.iterator();while(it.hasNext()){Element bookElement = (Element)it.next();Iterator iterator = bookElement.elementIterator("title");while(iterator.hasNext()){Element titleElement = (Element)iterator.next();if(titleElement.getText().equals("Dom4j Tutorials")){bookElement.remove(titleElement);}}}try{XMLWriter w = new XMLWriter(new FileWriter(new File(newfilename)));w.write(doc);w.close();returnValue = 1;}catch (Exception e) {// TODO: handle exception}} catch (DocumentException e) {// TODO Auto-generated catch blocke.printStackTrace();}return returnValue;}/* * xml文件格式化的问题 */public int formatXMLFile(String filename){int returnValue = 0;try {SAXReader saxReader = new SAXReader();Document doc = saxReader.read(new File(filename));XMLWriter output = null;OutputFormat format = OutputFormat.createPrettyPrint();format.setEncoding("utf-8");output = new XMLWriter(new FileWriter(new File(filename)),format);output.write(doc);output.close();returnValue = 1;} catch (DocumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return returnValue;}}

 

 

package hb.java;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.util.Iterator;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.stream.StreamSource;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.DocumentException;import org.dom4j.io.DocumentResult;import org.dom4j.io.DocumentSource;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class Foo {public Document parse(File file) throws DocumentException {// 以DOM4J默认的SAX解析器解析SAXReader reader = new SAXReader();// read函数的形参可以是url 也可以是 File类型，也可以是STRING类型的相对或绝对路径Document document = reader.read(file);return document;}public void bar(Document document) throws DocumentException {// 获得根节点Element root = document.getRootElement();// i为根节点孩子节点的迭代器for (Iterator i = root.elementIterator(); i.hasNext();) {Element element = (Element) i.next();// do somethingSystem.out.println(element.getName());}// 名为“student1”节点以下孩子节点的迭代器for (Iterator i = root.elementIterator("student1"); i.hasNext();) {Element foo = (Element) i.next();// do somethingSystem.out.println(foo.getText());}// 根节点属性的迭代器for (Iterator i = root.attributeIterator(); i.hasNext();) {Attribute attribute = (Attribute) i.next();// do somethingSystem.out.println(attribute.getValue());}}public Document createDocument() {        Document document = DocumentHelper.createDocument();        Element root = document.addElement( "root" );         Element author1 = root.addElement( "author" )            .addAttribute( "name", "James" )            .addAttribute( "location", "UK" )            .addText( "James Strachan" );         Element author2 = root.addElement( "author" )            .addAttribute( "name", "Bob" )            .addAttribute( "location", "US" )            .addText( "Bob McWhirter" );         return document;    }public void write(Document document) throws IOException {         // lets write to a file        XMLWriter writer = new XMLWriter(            new FileWriter( "output.xml" )        );        writer.write( document );        writer.close();         // 打印出Pretty的样式。即元素之间有换行。        OutputFormat format = OutputFormat.createPrettyPrint();        writer = new XMLWriter( System.out, format );        writer.write( document );         // 紧凑的格式，所有元素在一行        format = OutputFormat.createCompactFormat();        writer = new XMLWriter( System.out, format );        writer.write( document );    }public Document styleDocument(Document document, String stylesheet) throws Exception {// load the transformer using JAXPTransformerFactory factory = TransformerFactory.newInstance();Transformer transformer = factory.newTransformer(new StreamSource(stylesheet));// now lets style the given documentDocumentSource source = new DocumentSource(document);DocumentResult result = new DocumentResult();transformer.transform(source, result);// return the transformed documentDocument transformedDoc = result.getDocument();return transformedDoc;}}