JavaSE XML解析技术的使用方法详解

<?xml version="1.0" encoding="UTF-8"?>
<books>
    <book id="0001" desc="我是第一本书">
        <name>     Javaweb开发教程</name>
        <author> 张孝祥    </author>
        <sale>100.00元</sale>
    </book>
    <book id="0002">
        <name>三国演义</name>
        <author>罗贯中</author>
        <sale>100.00元</sale>
    </book>
    <sql>
        select * from user where age >= 18
    </sql>
</books>

public static void main(String[] args) throws Exception {
    // 1. 创建一个Dom4j解析对象
    SAXReader saxReader = new SAXReader();
    // 把XML文件加载到内存中成为一个Document对象
    // Document document = saxReader.read(new File("/Users/chenyq/Documents/learn_Java/code/JavaSE/xml-app/src/books.xml"));
    InputStream is = Dom4jDemo.class.getResourceAsStream("/books.xml");
    Document document = saxReader.read(is);

    // 2. 获取根元素对象
    Element root = document.getRootElement();
}

public static void main(String[] args) throws Exception {
    SAXReader saxReader = new SAXReader();
    InputStream is = Dom4jDemo.class.getResourceAsStream("/books.xml");
    Document document = saxReader.read(is);

    Element root = document.getRootElement();

    // 获取根元素下的所有子元素
    List<Element> allsonEls = root.elements();
    // 打印子元素的名称
    for (Element allsonEl : allsonEls) {
        System.out.println(allsonEl.getName()); // book book sql
    }

    // 获取当前元素下指定名字的子元素返回的集合
    List<Element> bookEls = root.elements("book");
    for (Element bookEl : bookEls) {
        System.out.println(bookEl.getName()); // book book
    }

    // 得到当前元素下指定名字的子元素,如果有很多名字相同的返回第一个
    Element bookEL = root.element("book");
    System.out.println(bookEL.getName()); // book

    // 通过属性名获取属性值
    System.out.println(bookEL.attributeValue("id")); // 0001

    // 得到指定名称的子元素的文本
    System.out.println(bookEL.elementText("name")); //      javaweb开发教程

    // 得到文本
    System.out.println(bookEL.element("sale").getText()); // 100.00元
}

<?xml version="1.0" encoding="UTF-8"?>
<contactList>
    <contact id="1">
        <name>潘金莲</name>
        <gender>女</gender>
        <email>panpan@itcast.cn</email>
    </contact>
    <contact id="2">
        <name>武松</name>
        <gender>男</gender>
        <email>wusong@itcast.cn</email>
    </contact>
    <contact id="3">
        <name>武大狼</name>
        <gender>男</gender>
        <email>wuda@itcast.cn</email>
    </contact>
    <user>
    </user>
</contactList>

public class Contact {
    private int id;
    private String name;
    private char gender;
    private String email;

    public Contact() {}

    public Contact(int id, String name, char gender, String email) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.email = email;
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public char getGender() {
        return gender;
    }

    public void setGender(char gender) {
        this.gender = gender;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Contact{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender=" + gender +
                ", email='" + email + '\'' +
                '}';
    }
}