XML：Extensible Markup Language，可扩展标记语言，左卫门数据的一种存储格式或用于存储软件的参数，程序解析此配置文件，就可以达到不修改代码就能更改程序的目的。

    
        
             
      
       至尊宝
      >        
      
       9000
          
         
             
      
       白晶晶
      >        
      
       2000
          
     
    

package server.study;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import java.io.IOException;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;/** * 熟悉SAX解析流程 * Created by 16114 on 2019/8/22. * */public class XmlTest01 {    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {        //SAX解析        //1.获取解析工厂        SAXParserFactory factory = SAXParserFactory.newInstance();        //2.从解析工厂获取解析器        SAXParser parser = factory.newSAXParser();        //3.编写处理器        //4.加载文档Document注册处理器        PHandler handler = new PHandler();        //5.解析        parser.parse(Thread.currentThread().getContextClassLoader()                        .getResourceAsStream("server/study/p.xml") ,handler);    }}class PHandler extends DefaultHandler{    @Override    public void startDocument() throws SAXException {        System.out.println("---解析文档开始---");    }    @Override    public void endDocument() throws SAXException {        System.out.println("---解析文档结束---");    }    @Override    public void characters(char[] ch, int start, int length) throws SAXException {        String contents = new String(ch,start,length).trim();        if (contents.length() > 0) {            System.out.println("内容为-->" + contents);        } else {            System.out.println("内容为-->" + "空");        }    }    @Override    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {       // super.startElement(uri, localName, qName, attributes);        System.out.println(qName+ "--->解析开始 ");    }    @Override    public void endElement(String uri, String localName, String qName) throws SAXException {        //super.endElement(uri, localName, qName);        System.out.println(qName+ "--->解析结束");    }}

package server.study;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;/** * 熟悉SAX解析流程 * Created by 16114 on 2019/8/22. * */public class XmlTest02 {    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {        //SAX解析        //1.获取解析工厂        SAXParserFactory factory = SAXParserFactory.newInstance();        //2.从解析工厂获取解析器        SAXParser parser = factory.newSAXParser();        //3.编写处理器        //4.加载文档Document注册处理器        PersonHandler handler = new PersonHandler();        //5.解析        parser.parse(Thread.currentThread().getContextClassLoader()                .getResourceAsStream("server/study/p.xml") ,handler);        //获取数据        List
    
      persons = handler.getPersons();        for (Person p:persons             ) {            System.out.println(p.getName()+"-->"+p.getAge());        }    }}class PersonHandler extends DefaultHandler{    private List
     
       persons;    private Person person;    private String tag; //存储操作标签    public List
      
        getPersons() {        return persons;    }    @Override    public void startDocument() throws SAXException {        persons = new ArrayList
       
        ();        //System.out.println("---解析文档开始---");    }    @Override    public void endDocument() throws SAXException {        //System.out.println("---解析文档结束---");    }    @Override    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {        // super.startElement(uri, localName, qName, attributes);        System.out.println(qName+ "--->解析开始 ");        if (null != qName){            tag = qName; //存储            if (tag.equals("person")){                person = new Person();            }        }    }    @Override    public void characters(char[] ch, int start, int length) throws SAXException {        String contents = new String(ch,start,length).trim();        if (null != tag) { //处理了空            if (tag.equals("name")) {                person.setName(contents);            } else if (tag.equals("age")) {                if (contents.length() > 0) {                    person.setAge(Integer.valueOf(contents));                }            }        }    }    @Override    public void endElement(String uri, String localName, String qName) throws SAXException {        //super.endElement(uri, localName, qName);        System.out.println(qName+ "--->解析结束");        if (null != qName) {            if (qName.equals("person")) {                persons.add(person);            }        }        tag = null;    }}