Java利用Sax解析xml文件

1、首先创建Person类

package com.zby.po;

public class Person {
    private String name;
    private Integer age;
    private String cla;

    public String getCla() {
        return cla;
    }

    public void setCla(String cla) {
        this.cla = cla;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Person(String name, Integer age,String cla) {
        this.name = name;
        this.age = age;
        this.cla=cla;
    }

    public Person() {
    }

    @Override
    public String toString() {
        return super.toString();
    }
}

2、 创建PersonHandler,继承DefaultHandler 重写其中的方法

package com.zby.handler;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

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

import com.zby.po.Person;

/**
 * 自定义PersonHandler,继承DefaultHandler 重写其中的方法
 *
 */
public class PersonHandler extends DefaultHandler {

    public List<Person> list; // 存储<Person>...</person>
    private Person person;
    private String tag; // 标签名

    // 开始文档Persons
    @Override
    public void startDocument() throws SAXException {
        list = new ArrayList<Person>();
    }

    // 标签元素开始<person>
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        if (qName != null && qName.equals("person")) {
            person = new Person();
        }
        tag = qName;
    }

    // 文档字符<person>..</person>
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        String data = new String(ch, start, length);
        if (tag != null) {
            if (tag.equals("name")) {
                person.setName(data);
            } else if (tag.equals("age")) {
                person.setAge(Integer.valueOf(data));
            } else if (tag.equals("cla")) {
                person.setCla(data);
            }
        }
    }

    // 文档技术</person>
    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        if (qName.equals("person")) {
            list.add(person);
        }
        tag = null;
    }

    @Override
    public void endDocument() throws SAXException {

    }
}

3、测试

import java.io.IOException;
import java.lang.reflect.Field;
import java.util.List;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.SAXException;

import com.zby.handler.PersonHandler;
import com.zby.po.Person;

public class TestHandler {
    public static void main(String[] args) throws SAXException, IOException, ParserConfigurationException {

        // 获取sax解析工厂
        SAXParserFactory factory = SAXParserFactory.newInstance();
        // 获取解析工厂下的解析器
        SAXParser parser = factory.newSAXParser();
        // 获取解析的handler处理器
        PersonHandler handler = new PersonHandler();
        // 在该处理器的基础上加载xml文件
        parser.parse(Thread.currentThread().getContextClassLoader().getResourceAsStream("配置文件/person.xml"), handler);

        List<Person> lis = handler.list;
        for (Person p : lis) {
            System.out.println("个人信息：" + p.getName() + "\t" + p.getAge() + "\t" + p.getCla());
        }
    }
}

4、xml所在项目的位置：该项目配置文件–>person.xml

<persons>
    <person>
        <age>22</age>
        <name>张三</name>
        <cla>大一</cla>
    </person>
    <person>
        <age>21</age>
        <name>李四</name>
        <cla>大二</cla>
    </person>
</persons>