XML 解析--- DOM和SAP

<?xml version="1.0" encoding="UTF-8"?><person><student> <name>zhangsan</name><age>20</age><sex>male</sex></student><student> <name>lisi</name><age>21</age><sex>male</sex></student><student> <name>wangwu</name><age>22</age><sex>female</sex></student></person>

 

 

 

DOM:

package com.dom;import java.io.File;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.NodeList;public class DomTest {public static void main(String[] args)throws Exception {//step1: 获取解析工厂DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();// step2: 获取具体的解析器DocumentBuilder db = dbf.newDocumentBuilder();// step3: 通过解析器获取文档实例 Document Document document = db.parse(new File("src/com/dom/person.xml"));// step4: 获取节点列表NodeList list = document.getElementsByTagName("student");for(int i=0; i<list.getLength(); i++){Element element = (Element)list.item(i);NodeList nameList = element.getElementsByTagName("name");for(int j=0; j<nameList.getLength(); j++){Element eleName = (Element)nameList.item(j);String name = eleName.getFirstChild().getNodeValue();System.out.println(name);}}}}

 

 

 

SAP:

 

package com.dom;import java.io.File;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;public class SaxTest {public static void main(String[] args)throws Exception {// step1: 获取解析工厂SAXParserFactory spf = SAXParserFactory.newInstance();// step2: 获取解析器SAXParser parser = spf.newSAXParser();// setp3: 使用解析器解析文档 parser.parse(new File("src/com/dom/person.xml"), new MyHandle()); // 注册监听}}class MyHandle extends DefaultHandler{@Overridepublic void characters(char[] ch, int start, int length)throws SAXException {String value = new String(ch,start,length);if(value.trim() != ""){System.out.println("元素的值: "+value.length()+" -->" + value);}}@Overridepublic void startDocument() throws SAXException {System.out.println("-----文档开始-----");}@Overridepublic void startElement(String uri, String localName, String name,Attributes attributes) throws SAXException {System.out.println("====元素 "+name+" 开始====");}@Overridepublic void endElement(String uri, String localName, String name)throws SAXException {System.out.println("====元素 "+name+" 结束====");}@Overridepublic void endDocument() throws SAXException {System.out.println("-----文档开始结束-----");}}

 

 

====实例===

 

package com.test;import java.io.File;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.NamedNodeMap;import org.w3c.dom.Node;import org.w3c.dom.NodeList;public class DOMTreeTest{public static void main(String[] args) throws Exception{DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse(new File("candidate.xml"));Element root = document.getDocumentElement();parseXML(root);}public static void parseXML(Element e){System.out.print("<" + e.getTagName());NamedNodeMap map = e.getAttributes();if(null != map){for(int i = 0 ; i < map.getLength() ; ++i){Node node = map.item(i);System.out.print(" " + node.getNodeName() + "=/"" + node.getNodeValue() + "/"");}System.out.print(">");}NodeList list = e.getChildNodes();for(int i = 0 ;i < list.getLength() ; ++i){Node node = list.item(i);//表明该节点是一个元素if(Element.ELEMENT_NODE == node.getNodeType()){parseXML((Element)node);}else{System.out.print(node.getNodeValue());}}System.out.print("</" + e.getNodeName() + ">");}}