轻松使用sax解析xml

sax方式解析xml的优点：
          只要有jdk的存在，严格意义上来说是jre，它就可以运行，不依赖任何第三方的jar包。在移动设备上尤为广泛使用。比如Android就使用它来解析xml。当然Android更为推荐的是采用xmlpull来解析xml。这种方式也同样适合javase。我在后期会为大家准备使用xmlpull解析xml的demo。敬请关注。 

 xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<root>
	<student id="1" group="1">
		<name>张三</name>
		<sex>男</sex>
		<age>18</age>
		<email>[email protected]</email>
		<birthday>1987-06-08</birthday>
		<memo>好学生</memo>
	</student>
	<student id="2" group="2">
		<name>李四</name>
		<sex>女</sex>
		<age>18</age>
		<email>[email protected]</email>
		<birthday>1987-06-08</birthday>
		<memo>好学生</memo>
	</student>
	<student id="3" group="3">
		<name>小王</name>
		<sex>男</sex>
		<age>18</age>
		<email>[email protected]</email>
		<birthday>1987-06-08</birthday>
		<memo>好学生</memo>
	</student>
	<student id="4" group="4">
		<name>小张</name>
		<sex>男</sex>
		<age>18</age>
		<email>[email protected]</email>
		<birthday>1987-06-08</birthday>
		<memo>好学生</memo>
	</student>
	<student id="5" group="5">
		<name>小明</name>
		<sex>男</sex>
		<age>18</age>
		<email>[email protected]</email>
		<birthday>1987-06-08</birthday>
		<memo>好学生</memo>
	</student>
</root>

xml对应的Javabean：

package com.parsexml.entity;

public class Student {
	
	private int id;
	private int group;
	private String name;
	private String sex;
	private int age;
	private String email;
	private String memo;
	private String birthday;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public int getGroup() {
		return group;
	}
	public void setGroup(int group) {
		this.group = group;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public String getMemo() {
		return memo;
	}
	public void setMemo(String memo) {
		this.memo = memo;
	}
	public String getBirthday() {
		return birthday;
	}
	public void setBirthday(String birthday) {
		this.birthday = birthday;
	}
	
}

 

开始解析：

package com.parsexml;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.ParserConfigurationException;
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;

import com.parsexml.entity.Student;

/**
 * 功能描述:采用sax方式解析XML<br>
 * 
 * @author sxyx2008
 *
 */
public class SaxParseXml extends DefaultHandler{

	//存放遍历集合
	private List<Student> list;
	//构建Student对象
	private Student student;
	//用来存放每次遍历后的元素名称(节点名称)
	private String tagName;
	
	
	public List<Student> getList() {
		return list;
	}


	public void setList(List<Student> list) {
		this.list = list;
	}


	public Student getStudent() {
		return student;
	}


	public void setStudent(Student student) {
		this.student = student;
	}


	public String getTagName() {
		return tagName;
	}


	public void setTagName(String tagName) {
		this.tagName = tagName;
	}


	//只调用一次  初始化list集合  
	@Override
	public void startDocument() throws SAXException {
		list=new ArrayList<Student>();
	}
	
	
	//调用多次    开始解析
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		if(qName.equals("student")){
			student=new Student();
			//获取student节点上的id属性值
			student.setId(Integer.parseInt(attributes.getValue(0)));
			//获取student节点上的group属性值
			student.setGroup(Integer.parseInt(attributes.getValue(1)));
		}
		this.tagName=qName;
	}
	
	
	//调用多次  
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		if(qName.equals("student")){
			this.list.add(this.student);
		}
		this.tagName=null;
	}
	
	
	//只调用一次
	@Override
	public void endDocument() throws SAXException {
	}
	
	//调用多次
	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		if(this.tagName!=null){
			String date=new String(ch,start,length);
			if(this.tagName.equals("name")){
				this.student.setName(date);
			}
			else if(this.tagName.equals("sex")){
				this.student.setSex(date);
			}
			else if(this.tagName.equals("age")){
				this.student.setAge(Integer.parseInt(date));
			}
			else if(this.tagName.equals("email")){
				this.student.setEmail(date);
			}
			else if(this.tagName.equals("birthday")){
				this.student.setBirthday(date);
			}
			else if(this.tagName.equals("memo")){
				this.student.setMemo(date);
			}
		}
	}
	
	
	
	public static void main(String[] args) {
		SAXParser parser = null;
		try {
			//构建SAXParser
			parser = SAXParserFactory.newInstance().newSAXParser();
			//实例化  DefaultHandler对象
			SaxParseXml parseXml=new SaxParseXml();
			//加载资源文件 转化为一个输入流
			InputStream stream=SaxParseXml.class.getClassLoader().getResourceAsStream("Student.xml");
			//调用parse()方法
			parser.parse(stream, parseXml);
			//遍历结果
			List<Student> list=parseXml.getList();
			for(Student student:list){
				System.out.println("id:"+student.getId()+"\tgroup:"+student.getGroup()+"\tname:"+student.getName()+"\tsex:"+student.getSex()+"\tage:"+student.getAge()+"\temail:"+student.getEmail()+"\tbirthday:"+student.getBirthday()+"\tmemo:"+student.getMemo());
			}
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
}

 

 

 注：如需运行代码，添加Student.xml到你的src目录下即可
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