XML解析

Sax解析：流的方式进行解析
流解析：以流的方式进行解析（一行一行解析）
Dom解析：加载整个文档，以树的方式解析

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class XmlTest01 {
    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser saxParser = factory.newSAXParser();
        PHandler pHandler = new PHandler();
        saxParser.parse(Thread.currentThread().getContextClassLoader().getResourceAsStream("p.xml"), pHandler);
        List<Person> persons = pHandler.getPersonList();
        for (int i = 0; i < persons.size(); i++) {
            System.out.println(persons.get(i).getName());
            System.out.println(persons.get(i).getAge());
        }
    }
}

class PHandler extends DefaultHandler {
    private List<Person> personList;
    private Person person;
    private String tag;

    public List<Person> getPersonList() {
        return personList;
    }

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

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        System.out.println(qName + "解析开始");
        if (null != qName) {
            tag = qName;
            if (qName.equals("person")) {
                person = new Person();
            }
        }
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        if (tag != null) {
            String content = new String(ch, start, length).trim();
            if (tag.equals("name")) {
                if (content.length() > 0)
                    person.setName(content);
            }
            if (tag.equals("age")) {
                if (content.length() > 0)
                    person.setAge(Integer.valueOf(content));
            }
        }
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        System.out.println(qName + "解析结束");
        if (qName != null) {
            if (qName.equals("person")) {
                personList.add(person);
            }
        }
        tag = null;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<persons>
    <person>
        <name>kari</name>
        <age>1000</age>
    </person>
    <person>
        <name>sakara</name>
        <age>7000</age>
    </person>
</persons>