SAX解析XML详解编程语言

<?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> 
</root>

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; 
       
    //省略get/set方法......   
}

import java.util.ArrayList; 
import java.util.List; 
 
 
import org.xml.sax.Attributes; 
import org.xml.sax.SAXException; 
import org.xml.sax.helpers.DefaultHandler; 
 
 
 
/** 
 * 功能描述:采用sax方式解析XML<br> 
 *  
 * @author smn 
 * 
 */ 
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); 
            } 
        } 
    } 
}

import javax.xml.parsers.SAXParser; 
import javax.xml.parsers.ParserConfigurationException; 
import javax.xml.parsers.SAXParserFactory; 
 
import org.xml.sax.SAXException; 
 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.List; 
 
public class Test { 
 
    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(student); 
            } 
        } catch (ParserConfigurationException e) { 
            e.printStackTrace(); 
        } catch (SAXException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
     
}