XML文件生成—DOM方式

最新推荐文章于 2020-05-15 17:20:07 发布

原创最新推荐文章于 2020-05-15 17:20:07 发布 · 5.8k 阅读

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文章标签：

#java #XML #DOM

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本文介绍了如何在Java中利用DOM模型来创建XML文件，详细阐述了从定义实体类到生成XML文件的步骤，适合Java开发者学习XML处理。

1：实体类

public class Book {
    private Integer id;
    private String name;
    private String author;
    private String year;
    private Double price;
    public Book() {
        super();
    }
    public Book(Integer id, String name, String author, String year,
            Double price) {
        super();
        this.id = id;
        this.name = name;
        this.author = author;
        this.year = year;
        this.price = price;
    }
}

2：准备类数据

public class CreatData {
    public static List<Book> getData(){
        List<Book> list=new ArrayList<Book>();
        for (int i = 1; i < 4; i++) {
            Book book =new Book(i, "猪"+i+"戒", "老"+i+"佳", "163"+i, 36.5+i);
            list.add(book);
        }
        return list;
    }
}

3：生成XML文件代码

public class DomCreatXml {
    public static void main(String[] args) {
        new DomCreatXml().creatXml();
    }

    // 返回一个DocumentBuilder对象
    public DocumentBuilder getDocumentBuilder() {
        DocumentBuilder db = null;
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            db = dbf.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        }
        return db;
    }

    // 创建xml文件
    private void creatXml() {
        DocumentBuilder db = getDocumentBuilder();
        // 创建文档对象
        Document document = db.newDocument();
        // 设置xml文件中不显示 standalone="no"
        document.setXmlStandalone(true);
        // 创建跟节点bookstore
        Element bookstore = document.createElement("bookstore");
        // 获取book数据
        List<Book> bookList = CreatData.getData();
        // 遍历，取出list集合中的book数据
        for (int i = 0; i < bookList.size(); i++) {
            // 创建book节点，以及book下面的各次级节点
            Element book = document.createElement("book");
            Element name = document.createElement("name");
            Element author = document.createElement("author");
            Element year = document.createElement("year");
            Element price = document.createElement("price");
            // 取值
            Book bk = bookList.get(i);
            name.setTextContent(bk.getName());
            author.setTextContent(bk.getAuthor());
            year.setTextContent(bk.getYear());
            price.setTextContent(bk.getPrice().toString());
            /**
             * 将book的子节点先添加在book下，将book节点添加到根节点bookstore下，
             * 再将bookstore添加到dom树下,是一个从最子到父的逐层添加过程
             */
            book.setAttribute("id", bk.getId().toString());
            book.appendChild(name);
            book.appendChild(author);
            book.appendChild(year);
            book.appendChild(price);
            bookstore.appendChild(book);
        }
        document.appendChild(bookstore);
        // 创建TransformerFactory对象
        TransformerFactory tff = TransformerFactory.newInstance();
        try {
            Transformer tf = tff.newTransformer();
            // 设置换行
            tf.setOutputProperty(OutputKeys.INDENT, "yes");
            // 设置生成xml文件
            tf.transform(new DOMSource(document), new StreamResult(new File(
                    "resouce/creatBook1.xml")));
        } catch (TransformerConfigurationException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (TransformerException e) {
            e.printStackTrace();
        }
    }
}

4：效果

<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
    <book id="1">
        <name>猪1戒</name>
        <author>老1佳</author>
        <year>1631</year>
        <price>37.5</price>
    </book>
    <book id="2">
        <name>猪2戒</name>
        <author>老2佳</author>
        <year>1632</year>
        <price>38.5</price>
    </book>
    <book id="3">
        <name>猪3戒</name>
        <author>老3佳</author>
        <year>1633</year>
        <price>39.5</price>
    </book>
</bookstore>