XML SAX: Tính tổng số & in ra danh sách theo ĐỀ BÀI

danhsachsinhvien.xml

Java XML 2016

<?xml version="1.0" encoding="UTF-8"?>
<danhsachsinhvien>
    <sinhvien>
        <masv>sv01</masv>
        <hoten>sinh vien 1</hoten>
    </sinhvien>
    <sinhvien>
        <masv>sv02</masv>
        <hoten>sinh vien 2</hoten>
    </sinhvien>
    <sinhvien>
        <masv>sv03</masv>
        <hoten>sinh vien 3</hoten>
    </sinhvien>
    
</danhsachsinhvien>

DemoSAX.java

Java XML 2016

package demosax;

public class DemoSAX {

    public static void main(String[] args) {
        DanhSachSinhVien dssv = new DanhSachSinhVien();
        dssv.hienthi();
    }

}

DemoSAX.java

Java XML 2016

package demosax;

import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

public class DanhSachSinhVien {

    public void hienthi() {
        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            sp.parse("src\\database\\danhsachsinhvien.xml", new DSSVHandler());
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }

    private class DSSVHandler extends DefaultHandler {

        private int dem = 0;
        private String tagName="";

        @Override
        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
            if (qName.equals("sinhvien")) {
                this.dem++;
                System.out.println("================");
            }
            if(qName.equals("masv")){
                tagName = qName;
            }
             if(qName.equals("hoten")){
                tagName = qName;
            }
             
        }

        @Override
        public void characters(char[] ch, int start, int length) throws SAXException {
            if(tagName.equals("masv")){
                System.out.println("Ma sinh vien: "+ (new String(ch, start, length)));
                this.tagName="";
            } 
            if(tagName.equals("hoten")){
                System.out.println("Ho ten: "+ (new String(ch, start, length)));
                this.tagName="";
            }
        }


        @Override
        public void endDocument() throws SAXException {
            System.out.println("================");
            System.out.println("Tong so sinh vien la: " + this.dem);
        }

    }
}