XML解析

一、Dom4J解析

　　Dom4J解析代码

package dom4j;

import java.io.File;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class testDom4J {

    public static void main(String[] args) {

        try {

            File file = new File("/home/ybxxszl/Java Workspace/test/src/user.xml");// 获取File对象
            SAXReader reader = new SAXReader();// 获取SAXReader对象
            Document document = reader.read(file);// 获取Document对象
            Element list = document.getRootElement();// 获取根节点
            Iterator<Element> it1 = list.elementIterator();// 获取根节点下子节点的迭代器
            while (it1.hasNext()) {
                Element user = it1.next();// 获取根节点下子节点
                List<Attribute> userAttrs = user.attributes();// 获取根节点下子节点的属性名和属性值
                for (Attribute attribute : userAttrs) {
                    System.out.println("属性名" + attribute.getName());
                    System.out.println("属性值" + attribute.getValue());
                }
                Iterator<Element> it2 = user.elementIterator();// 获取根节点下子节点下子节点的迭代器
                while (it2.hasNext()) {
                    Element userChild = it2.next();// 获取根节点下子节点下子节点
                    System.out.println("节点名：" + userChild.getName());
                    System.out.println("节点值：" + userChild.getStringValue());
                }
            }

        } catch (DocumentException e) {
            e.printStackTrace();
        }

    }

}

二、SAX解析

　　User

package sax;

public class User {

    private String id;
    private String account;
    private String password;
    private String name;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "User [id=" + id + ", account=" + account + ", password=" + password + ", name=" + name + "]";
    }

}

　　SAX解析代码

package sax;

import java.io.File;
import java.util.List;

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

public class testSax {

    public static void main(String[] args) {

        try {

            File file = new File("/home/ybxxszl/Java Workspace/test/src/user.xml");
            SAXParserFactory factory = SAXParserFactory.newInstance();
            SAXParser parser = factory.newSAXParser();
            SAXParserHandler handler = new SAXParserHandler();
            parser.parse(file, handler);
            List<User> list = handler.getList();
            for (int i = 0; i < list.size(); i++) {
                System.out.println(list.get(i).toString());
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

package sax;

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

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

public class SAXParserHandler extends DefaultHandler {

    private String value = null;
    private User user = null;

    private List<User> list = new ArrayList<User>();

    public List<User> getList() {
        return list;
    }

    @Override
    public void startDocument() throws SAXException {
        super.startDocument();
        System.out.println("SAX解析开始");
    }

    @Override
    public void endDocument() throws SAXException {
        super.endDocument();
        System.out.println("SAX解析结束");
    }

    @Override
    public void startElement(String url, String localName, String qName, Attributes attributes) throws SAXException {
        super.startElement(url, localName, qName, attributes);
        if (qName.equals("user")) {
            user = new User();
            for (int i = 0; i < attributes.getLength(); i++) {
                System.out.println("属性名：" + attributes.getQName(i) + " 属性值：" + attributes.getValue(i));
            }
        } else if (!qName.equals("list") && !qName.equals("user")) {
            System.out.print("节点名：" + qName);
        }
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        super.endElement(uri, localName, qName);
        if (qName.equals("user")) {
            list.add(user);
            user = null;
        } else if (qName.equals("id")) {
            user.setId(value);
        } else if (qName.equals("account")) {
            user.setAccount(value);
        } else if (qName.equals("password")) {
            user.setPassword(value);
        } else if (qName.equals("name")) {
            user.setName(value);
        }
    }

    @Override
    public void characters(char[] c, int start, int length) throws SAXException {
        super.characters(c, start, length);
        value = new String(c, start, length);
        if (!value.trim().equals("")) {
            System.out.println(" 节点值：" + value);
        }
    }
}

　　XML文件

<?xml version="1.0" encoding="UTF-8"?>
<list>
    <user id="user1">
        <id>1</id>
        <account>账号1</account>
        <password>密码1</password>
        <name>姓名1</name>
    </user>
    <user id="user2">
        <id>2</id>
        <account>账号2</account>
        <password>密码2</password>
        <name>姓名2</name>
    </user>
    <user id="user3">
        <id>3</id>
        <account>账号3</account>
        <password>密码3</password>
        <name>姓名3</name>
    </user>
</list>