（练习）遍历XML文档

import java.io.File;
import java.util.Iterator;
import java.util.List;


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


class Demo{
public static void main(String[] args) throws Exception {
SAXReader reader = new SAXReader();
Document doc = reader.read(new File("D:\\person.xml"));
Element rootElem = doc.getRootElement();
System.out.println(rootElem.getName());
Iterator<Element> it= rootElem.elementIterator("person");
while(it.hasNext()){
Element personElem = it.next();
System.out.println(personElem.getName());
List<Attribute> list1 = personElem.attributes();
for(Attribute attr:list1){
System.out.println(attr.getName()+"="+attr.getValue());
}
List<Element> list2 = personElem.elements();
for(Element elems:list2){
System.out.println(elems.getName()+"="+elems.getText());
}
}
}
}*/

/*

import java.io.File;
import java.util.List;


import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;


class Demo{
public static void main(String[] args) throws Exception{
SAXReader reader = new SAXReader();
Document doc = reader.read(new File("D:\\person.xml"));
Element rootElem = doc.getRootElement();
StringBuffer sb = new StringBuffer();
getChildElement(rootElem, sb);
System.out.println(sb.toString());
}
public static void getChildElement(Element elem, StringBuffer sb){
sb.append("<"+elem.getName());
//得到标签的属性列表
List<Attribute> atts = elem.attributes();
if(atts!=null){
for(Attribute attr:atts){
sb.append(" "+attr.getName()+"=\""+attr.getValue()+"\"");
}
}
sb.append(">");
List<Element> list = elem.elements();
for(Element element:list){
getChildElement(element, sb);
sb.append(element.getText());
}
//结束标签
sb.append("</"+elem.getName()+">");
}

}*/

package gz.itcast.a_dom4j_read;


import java.io.File;
import java.util.Iterator;
import java.util.List;


import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.Text;
import org.dom4j.io.SAXReader;
import org.junit.Test;
/**
 * 练习-完整读取xml文档内容
 * @author APPle
 *
 */
public class Demo3 {


@Test
public void test() throws Exception{
//读取xml文档
SAXReader reader = new SAXReader();
Document doc = 
reader.read(new File("./src/contact.xml"));

//读取根标签
Element rootELem = doc.getRootElement();

StringBuffer sb = new StringBuffer();

getChildNodes(rootELem,sb);

System.out.println(sb.toString());

}

/**
* 获取当前标签的所有子标签
*/
private void getChildNodes(Element elem,StringBuffer sb){
//System.out.println(elem.getName());

//开始标签
sb.append("<"+elem.getName());

//得到标签的属性列表
List<Attribute> attrs = elem.attributes();
if(attrs!=null){
for (Attribute attr : attrs) {
//System.out.println(attr.getName()+"="+attr.getValue());
sb.append(" "+attr.getName()+"=\""+attr.getValue()+"\"");
}
}
sb.append(">");

//得到文本
//String content = elem.getText();
//System.out.println(content);
Iterator<Node> it = elem.nodeIterator();
while(it.hasNext()){
Node node = it.next();

//标签
if(node instanceof Element){
Element el = (Element)node;
getChildNodes(el,sb);
}

//文本
if(node instanceof Text){
Text text = (Text)node;
sb.append(text.getText());
}
}

//结束标签
sb.append("</"+elem.getName()+">");




}
}