DOM4J

1.DOM4J解析XML

public class TestXml {

    public static void main(String[] args) throws Exception {
        //创建SAXReader对象，用于读取xml文件
        SAXReader reader = new SAXReader();
        //读取xml文件，得到Document对象
        Document doc = (Document) reader.read(new File("src/scores.xml"));
        //获取根元素
        Element root = doc.getRootElement();
        //获取根元素下所有子元素
        Iterator<Element> it = root.elementIterator();
        while(it.hasNext()){
            //取出元素
            Element e = it.next();
            System.out.println(e.getName());
            //获取id属性(可以使用迭代器)
            Attribute id = (Attribute) e.attribute("id");
            System.out.println(id.getName() + "=" +id.getValue());
            //获取student的子元素
            Element name = e.element("name");
            Element course = e.element("course");
            Element score = e.element("score");
            //打印
            System.out.println(name.getName()+ "=" +name.getStringValue());
            System.out.println(course.getName() + "=" + course.getText());
            System.out.println(score.getName() + "=" + score.getText());
            System.out.println("-----------------------");
        }
    }

}

2.DOM4J生成XML文件

public class TestXml2 {
    public static void main(String[] args) throws Exception {
        //通过DocumentHelper生成一个Document对象
        Document doc = DocumentHelper.createDocument();
        //添加并得到根元素
        Element root = doc.addElement("books");
        //为根元素添加子元素
        Element book = root.addElement("book");
        //为book元素添加属性,可以链式编程
        book.addAttribute("id", "b01");
        //为book添加子元素
        Element name = book.addElement("name");
        Element auther = book.addElement("auther");
        Element price = book.addElement("price");
        //为子元素添加文件
        name.addText("Thinking in Java");
        auther.addText("张三");
        price.addText("88");
        /*
　　　　　//将doc输出到xml文件中
        Writer writer = new FileWriter(new File("src/book.xml"));
        doc.write(writer);
        //关闭资源
        writer.close();
　　　　　*/
        //格式良好的输出
        OutputFormat format = OutputFormat.createPrettyPrint();
        XMLWriter writer = new XMLWriter(new FileWriter(new File("src/book.xml")), format);
        writer.write(doc);
        //关闭资源
        writer.close();
    }
}