标签：des Lucene style blog http io color ar os
|
Attribute定义了XML的属性
|
|
|
Branch为能够包含子节点的节点如XML元素(Element)和文档(Docuemnts)定义了一个公共的行为，
|
|
|
CDATA 定义了XML CDATA 区域
|
|
|
CharacterData是一个标识借口，标识基于字符的节点。如CDATA，Comment, Text.
|
|
|
Comment 定义了XML注释的行为
|
|
|
定义了XML文档
|
|
|
DocumentType 定义XML DOCTYPE声明
|
|
|
Element定义XML 元素
|
|
|
ElementHandler定义了 Element 对象的处理器
|
|
|
被 ElementHandler 使用，用于取得当前正在处理的路径层次信息
|
|
|
Entity定义 XML entity
|
|
|
Node为所有的dom4j中XML节点定义了多态行为
|
|
|
NodeFilter 定义了在dom4j节点中产生的一个滤镜或谓词的行为（predicate）
|
|
|
ProcessingInstruction 定义 XML 处理指令.
|
|
|
Text 定义XML 文本节点.
|
|
|
Visitor 用于实现Visitor模式.
|
|
|
XPath 在分析一个字符串后会提供一个XPath 表达式
|
大部分都是由Node继承来的。知道这些关系，将来写程序就不会出现ClassCastException了
|
// 从文件读取XML，输入文件名，返回XML文档
public Document read(String fileName) throws MalformedURLException, DocumentException {
SAXReader reader = new SAXReader();
Document document = reader.read(new File(fileName));
return document;
}
|
|
public Element getRootElement(Document doc){
return doc.getRootElement();
}
|
|
// 枚举所有子节点
for ( Iterator i = root.elementIterator(); i.hasNext(); ) {
Element element = (Element) i.next();
// do something
}
// 枚举名称为foo的节点
for ( Iterator i = root.elementIterator(foo); i.hasNext();) {
Element foo = (Element) i.next();
// do something
}
// 枚举属性
for ( Iterator i = root.attributeIterator(); i.hasNext(); ) {
Attribute attribute = (Attribute) i.next();
// do something
}
|
|
public void treeWalk() {
treeWalk(getRootElement());
}
public void treeWalk(Element element) {
for (int i = 0, size = element.nodeCount(); i < size; i++) {
Node node = element.node(i);
if (node instanceof Element) {
treeWalk((Element) node);
} else { // do something....
}
}
}
|
|
public class MyVisitor extends VisitorSupport {
public void visit(Element element){
System.out.println(element.getName());
}
public void visit(Attribute attr){
System.out.println(attr.getName());
}
}
调用： root.accept(new MyVisitor())
|
|
public void bar(Document document) {
List list = document.selectNodes( //foo/bar );
Node node = document.selectSingleNode(//foo/bar/author);
String name = node.valueOf( @name );
}
|
|
public void findLinks(Document document) throws DocumentException {
List list = document.selectNodes( //a/@href );
for (Iterator iter = list.iterator(); iter.hasNext(); ) {
Attribute attribute = (Attribute) iter.next();
String url = attribute.getValue();
}
}
|
|
// XML转字符串
Document document = ...;
String text = document.asXML();
// 字符串转XML
String text = James ;
Document document = DocumentHelper.parseText(text);
|
|
public Document styleDocument(
Document document,
String stylesheet
) throws Exception {
// load the transformer using JAXP
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer(
new StreamSource( stylesheet )
);
// now lets style the given document
DocumentSource source = new DocumentSource( document );
DocumentResult result = new DocumentResult();
transformer.transform( source, result );
// return the transformed document
Document transformedDoc = result.getDocument();
return transformedDoc;
}
|
|
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;
}
|
|
FileWriter out = new FileWriter( foo.xml );
document.write(out);
|
|
public void write(Document document) throws IOException {
// 指定文件
XMLWriter writer = new XMLWriter(
new FileWriter( output.xml )
);
writer.write( document );
writer.close();
// 美化格式
OutputFormat format = OutputFormat.createPrettyPrint();
writer = new XMLWriter( System.out, format );
writer.write( document );
// 缩减格式
format = OutputFormat.createCompactFormat();
writer = new XMLWriter( System.out, format );
writer.write( document );
}
|
|
holen.xml
|
|
<?xml version="1.0" encoding="UTF-8"?>
<!--This is a test for dom4j, holen, 2004.9.11-->
O‘Reilly
|
|
|
|
/**
* 建立一个XML文档,文档名由输入属性决定
* @param filename 需建立的文件名
* @return 返回操作结果, 0表失败, 1表成功
*/
public int createXMLFile(String filename){
/** 返回操作结果, 0表失败, 1表成功 */
int returnValue = 0;
/** 建立document对象 */
Document document = DocumentHelper.createDocument();
/** 建立XML文档的根books */
Element booksElement = document.addElement("books");
/** 加入一行注释 */
booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");
/** 加入第一个book节点 */
Element bookElement = booksElement.addElement("book");
/** 加入show属性内容 */
bookElement.addAttribute("show","yes");
/** 加入title节点 */
Element titleElement = bookElement.addElement("title");
/** 为title设置内容 */
titleElement.setText("Dom4j Tutorials");
/** 类似的完成后两个book */
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");
/** 加入owner节点 */
Element ownerElement = booksElement.addElement("owner");
ownerElement.setText("O‘Reilly");
try{
/** 将document中的内容写入文件中 */
XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));
writer.write(document);
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
}catch(Exception ex){
ex.printStackTrace();
}
return returnValue;
}
|
|
|
|
<?xml version="1.0" encoding="UTF-8"?>
<!--This is a test for dom4j, holen, 2004.9.11-->O‘Reilly
|
|
|
|
/**
* 修改XML文件中内容,并另存为一个新文件
* 重点掌握dom4j中如何添加节点,修改节点,删除节点
* @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表失败, 1表成功
*/
public int ModiXMLFile(String filename,String newfilename){
int returnValue = 0;
try{
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File(filename));
/** 修改内容之一: 如果book节点中show属性的内容为yes,则修改成no */
/** 先用xpath查找对象 */
List list = document.selectNodes("/books/book/@show" );
Iterator iter = list.iterator();
while(iter.hasNext()){
Attribute attribute = (Attribute)iter.next();
if(attribute.getValue().equals("yes")){
attribute.setValue("no");
}
}
/**
* 修改内容之二: 把owner项内容改为Tshinghua
* 并在owner节点中加入date节点,date节点的内容为2004-09-11,还为date节点添加一个属性type
*/
list = document.selectNodes("/books/owner" );
iter = list.iterator();
if(iter.hasNext()){
Element ownerElement = (Element)iter.next();
ownerElement.setText("Tshinghua");
Element dateElement = ownerElement.addElement("date");
dateElement.setText("2004-09-11");
dateElement.addAttribute("type","Gregorian calendar");
}
/** 修改内容之三: 若title内容为Dom4j Tutorials,则删除该节点 */
list = document.selectNodes("/books/book");
iter = list.iterator();
while(iter.hasNext()){
Element bookElement = (Element)iter.next();
Iterator iterator = bookElement.elementIterator("title");
while(iterator.hasNext()){
Element titleElement=(Element)iterator.next();
if(titleElement.getText().equals("Dom4j Tutorials")){
bookElement.remove(titleElement);
}
}
}
try{
/** 将document中的内容写入文件中 */
XMLWriter writer = new XMLWriter(new FileWriter(new File(newfilename)));
writer.write(document);
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
}catch(Exception ex){
ex.printStackTrace();
}
}catch(Exception ex){
ex.printStackTrace();
}
return returnValue;
}
|
|
|
|
/**
* 格式化XML文档,并解决中文问题
* @param filename
* @return
*/
public int formatXMLFile(String filename){
int returnValue = 0;
try{
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File(filename));
XMLWriter writer = null;
/** 格式化输出,类型IE浏览一样 */
OutputFormat format = OutputFormat.createPrettyPrint();
/** 指定XML编码 */
format.setEncoding("GBK");
writer= new XMLWriter(new FileWriter(new File(filename)),format);
writer.write(document);
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
}catch(Exception ex){
ex.printStackTrace();
}
return returnValue;
}
|
|
Dom4jDemo.java
|
|
package com.holen.dom4j;
import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
/**
* @author Holen Chen</
|
标签：des Lucene style blog http io color ar os
原文地址：http://www.cnblogs.com/sunshine-in/p/4071236.html
如果是UTF-8
FileWriter 改用 FileOutputStream