Sax解析xml文件

将所有文件放在包下即可运行。

解析过程：
1.获取解析工厂
2.从解析工厂中获得解析器
3.加载文档Document 编写处理器(重难点)

Students.xml

<?xml version="1.0" encoding="UTF-8"?>
<students>
	<student id="1">
		<name>王同</name>
		<course>java</course>
		<score>89</score>
	</student>
	<student id="2">
		<name>李佳</name>
		<course>sql</course>
		<score>58</score>
	</student>
</students>

Student.java

package sax;

public class Student {
	private String name;
	private String course;
	private int score;
	private int id;

	public Student() {

	}

	public Student(String name, String course, int score, int id) {
		super();
		this.name = name;
		this.course = course;
		this.score = score;
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getCourse() {
		return course;
	}

	public void setCourse(String course) {
		this.course = course;
	}

	public int getScore() {
		return score;
	}

	public void setScore(int score) {
		this.score = score;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

}

 

parse.java

 

package sax;

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;

public class parse {
	public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException{
		//1.获取解析工厂
		SAXParserFactory factory=SAXParserFactory.newInstance();
		//2.从解析工厂获得解析器
		SAXParser parse=factory.newSAXParser();
		//3.加载文档Document 注册处理器
		
		//4.编写处理器
		StudentHandler handler=new StudentHandler();
		
		//此写法针对并发操作，正常写xml路径即可
		parse.parse(Thread.currentThread().getContextClassLoader()
				.getResourceAsStream("sax/Student.xml"),handler);
		
		System.out.println("\n");
		List <Student> students = handler.getStudents();
		for(Student s:students){
			System.out.println(s.getName()+"-->"+s.getCourse()+"-->"+s.getScore());
		}
		}
	}

StudentHandler.java

package sax;

/**
 * 处理器
 */
import java.util.ArrayList;
import java.util.List;

import org.dom4j.tree.DefaultAttribute;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class StudentHandler extends DefaultHandler {

	private List<Student> students;
	private Student student;
	private String tag; // 记录标签名

	@Override
	public void startDocument() throws SAXException {
		students = new ArrayList<Student>();
	}

	// qName:标签名
	// attributes:属性对象
	@Override
	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

		if (qName != null) {
			tag = qName;
		}
		if (qName != null && qName.equals("student")) {
			student = new Student();
			student.setId(Integer.parseInt(attributes.getValue("id")));

			System.out.print("<" + qName + " " + attributes.getQName(0) + "=" + attributes.getValue("id") + ">");
		} else {
			System.out.print("<" + qName + ">");
		}

	}

	// 文本信息
	@Override
	public void characters(char[] ch, int start, int length) throws SAXException {
		String str = new String(ch, start, length);
		if (null != tag && tag.equals("name")) {
			student.setName(str);
		} else if (null != tag && tag.equals("course")) {
			student.setCourse(str);
		} else if (null != tag && tag.equals("score")) {
			Integer score = Integer.valueOf(str);
			student.setScore(score);
		}
		System.out.print(str);
	}

	// 以“/”位结束标志
	@Override
	public void endElement(String uri, String localName, String qName) throws SAXException {
		System.out.print("</" + qName + ">");
		if (qName.equals("student")) {
			this.students.add(student);
		}
		tag = null;
	}

	@Override
	public void endDocument() throws SAXException {

	}

	public List<Student> getStudents() {
		return students;
	}

	public void setStudents(List<Student> students) {
		this.students = students;
	}

}