XMl解析的几种方式

DOM解析

package com.xml.parse;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;import com.xml.model.Student;public class ParseByDom {public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {//声明一个集合用于存储解析文件之后获取的数据List<Student> students=new ArrayList<Student>();//获取需要被解析的文件对象File f=new File("src/student.xml");//获取解析工厂DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();//获取解析器对象DocumentBuilder builder=factory.newDocumentBuilder();//解析文件获取一个document对象Document document=builder.parse(f);//builder.parse(is);//获取指定标签的所有元素对象(student元素)NodeList list=document.getElementsByTagName("student");for(int i=0;i<list.getLength();i++){//获取每一个遍历的元素Element element=(Element)list.item(i);//获取当前元素的指定属性值String no=element.getAttribute("no");//获取子元素Element ename=(Element)element.getElementsByTagName("name").item(0);Element esex=(Element)element.getElementsByTagName("sex").item(0);Element emajor=(Element)element.getElementsByTagName("major").item(0);String name=ename.getTextContent();String sex=ename.getTextContent();String major=emajor.getTextContent();Student s=new Student(no,name,sex,major);students.add(s);}for(Student student:students){System.out.println(student);}}}

sax解析

package com.xml.parse;import java.io.File;import java.io.IOException;import java.util.List;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import com.xml.model.Student;public class ParseBySax {public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {File file=new File("src/student.xml");//获取sax解析工厂SAXParserFactory factory=SAXParserFactory.newInstance();//创建解析器对象SAXParser parser=factory.newSAXParser();MyHandler handler=new MyHandler();//开始解析parser.parse(file,handler);List<Student> students=handler.getStudents();for (Student student : students) {System.out.println(student);}}}

MyHandler

package com.xml.parse;import java.util.ArrayList;import java.util.List;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import com.xml.model.Student;/** * 事件处理器 * @author Administrator * */public class MyHandler extends DefaultHandler{private List<Student> students;private Student tempStu;//声明当前读取到的学生对象private String tag;//声名变量记录当前的标记//对外暴露一个方法，返回一个集合对象public List<Student> getStudents() {return students;}@Overridepublic void startDocument() throws SAXException {System.out.println("开始解析");students=new ArrayList<Student>();}@Overridepublic void startElement(String uri, String localName, String qName,Attributes attributes) throws SAXException {tag=qName;//如果读取到的元素开始标记为student则创建学生对象，并获取no属性值if("student".equals(qName)){tempStu=new Student();String no=attributes.getValue("no");tempStu.setNo(no);students.add(tempStu);}}@Overridepublic void characters(char[] ch, int start, int length)throws SAXException {String s=new String(ch,start,length);if("name".equals(tag)){tempStu.setName(s);}else if("sex".equals(tag)){tempStu.setSex(s);}else if("major".equals(tag)){tempStu.setMajor(s);}}@Overridepublic void endElement(String uri, String localName, String qName)throws SAXException {//将标记置空tag=null;}@Overridepublic void endDocument() throws SAXException {System.out.println("解析完成");}}

JDOM解析

package com.xml.parse;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.List;import org.jdom.Document;import org.jdom.Element;import org.jdom.JDOMException;import org.jdom.input.SAXBuilder;import com.xml.model.Student;public class ParseByJDOM {public List<Student> parse() throws JDOMException, IOException{List<Student> students=new ArrayList<Student>();File file=new File("src/student.xml");//创建jdomSAXBuilder builder=new SAXBuilder();//解析指定文件获取文档对象Document document=builder.build(file);//获取文档根节点Element root=document.getRootElement();//获取当前根节点下所有的student子节点List<Element> list=root.getChildren("student");for(Element e:list){Student s=new Student();String no=e.getAttributeValue("no");String name=e.getChild("name").getText();String sex=e.getChild("sex").getText();String major=e.getChild("major").getText();s.setNo(no);s.setName(name);s.setSex(sex);s.setMajor(major);students.add(s);}for (Student s : students) {System.out.println(s);}return students;}public static void main(String[] args) throws JDOMException, IOException {List<Student> list=new ParseByJDOM().parse();}}

DOM4J解析

package com.xml.parse;import java.io.File;import java.util.ArrayList;import java.util.List;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.Node;import org.dom4j.io.SAXReader;import com.xml.model.Student;public class ParseByDom4j {public List<Student> parse() throws DocumentException{List<Student> students=new ArrayList<Student>();File file=new File("src/student.xml");//创建解析器对象SAXReader reader=new SAXReader();//解析指定的文件获取文档对象Document document=reader.read(file);Element root=document.getRootElement();//获取根节点下所有的student节点List<Element> list=root.elements("student");for (Element e : list) {String no=e.attributeValue("no");String name=e.element("name").getTextTrim();String sex=e.element("sex").getTextTrim();String major=e.element("major").getTextTrim();Student s=new Student(no, name, major, sex);students.add(s);}return students;}public List<Student> parse2() throws DocumentException{List<Student> students=new ArrayList<Student>();File file=new File("src/student.xml");//创建解析器对象SAXReader reader=new SAXReader();//解析指定的文件获取文档对象Document document=reader.read(file);List<Node> nodes=document.selectNodes("students/student");for (Node node : nodes) {String no=node.valueOf("@no");String name=node.selectSingleNode("name").getText().trim();String sex=node.selectSingleNode("sex").getText().trim();String major=node.selectSingleNode("major").getText().trim();Student s=new Student(no, name, major, sex);students.add(s);}return students;}public static void main(String[] args) throws DocumentException {List<Student> list=new ParseByDom4j().parse2();for (Student student : list) {System.out.println(student);}}}

Dom4j_xpath解析

package com.xml.parse;import java.io.File;import java.util.List;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Node;import org.dom4j.io.SAXReader;public class ParseByDom4j_xpath {public static void main(String[] args) throws DocumentException {File file=new File("src/student.xml");SAXReader reader=new SAXReader();Document document=reader.read(file);//搜索节点List<Node> nodes=document.selectNodes("students/student/name");for (Node node : nodes) {String name=node.getText();System.out.println(name);}List<Node> list=document.selectNodes("students/student");for (Node node : list) {//查询属性值String no=node.valueOf("@no");System.out.println(no);String name=node.selectSingleNode("name").getText();System.out.println(name);}}}

student.xml

<?xml version="1.0" encoding="utf-8"?><students><student no="001"><name>张三丰</name><sex>男</sex><major>挖掘机专业</major></student><student no="002"><name>李逍遥</name><sex>女</sex><major>撩妹专业</major></student><student no="003"><name>碧瑶</name><sex>男</sex><major>撩汉专业</major></student></students>