1  dom 生成xml文档

  上一篇已经介绍了如何解析xml文档，现在利用解析得到的数据生成一份xml文档（需要用到上一篇中的Book.java  ReadXMLFile.java）。

2 生成xml文档的代码

CreateXML.java

package com.wnq.sk.domXML02;

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

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * 生成xml文档
 * 
 * @author liandong
 * 
 */
public class CreateXML
{
    static String fileName = "dom_create_books.xml";
    public static void main(String[] args)
    {
        List<Book> books = ReadXMLFile.readXMLFile("books.xml");
        createXMLFile(books);
    }
    
    private static void createXMLFile(List<Book> books)
    {
        // 准备好创建xml文档所需要的Document 和 各元素
        Document document;
        Element bookstore, book, title, author, year, price;
        DocumentBuilderFactory dBuilderFactory = DocumentBuilderFactory.newInstance();
        try
        {
            DocumentBuilder dBuilder = dBuilderFactory.newDocumentBuilder();
            document = dBuilder.newDocument();
            if (document != null)
            {
                bookstore = document.createElement("bookstore");
                for (int i = 0; i < books.size(); i++)
                {
                    book = document.createElement("book");
                    // 设置book的属性
                    book.setAttribute("catagory", books.get(i).getCategory());
                    title = document.createElement("title");
                    // 创建文本节点并作为子节点添加到title元素中
                    title.appendChild(document.createTextNode(books.get(i).getTitle()));
                    title.setAttribute("lang", books.get(i).getTitleLang());
                    book.appendChild(title);
                    String[] strAuthor = books.get(i).getAuthor().split("/");
                    for (int j = 0; j < strAuthor.length; j++)
                    {
                        author = document.createElement("author");
                        author.appendChild(document.createTextNode(strAuthor[j]));
                        book.appendChild(author);
                        
                    }
                    year = document.createElement("year");
                    year.appendChild(document.createTextNode(books.get(i).getYear().toString()));
                    book.appendChild(year);
                    price = document.createElement("price");
                    price.appendChild(document.createTextNode(books.get(i).getPrice().toString()));
                    book.appendChild(price);
                    bookstore.appendChild(book);
                }
                document.appendChild(bookstore);
                TransformerFactory transformerFactory = TransformerFactory.newInstance();
                try
                {
                    Transformer transformer = transformerFactory.newTransformer();
                    DOMSource domSource = new DOMSource(document);
                    StreamResult result = new StreamResult(new File(fileName));
                    try
                    {
                        transformer.transform(domSource, result);
                    }
                    catch (TransformerException e)
                    {
                        e.printStackTrace();
                    }
                }
                catch (TransformerConfigurationException e)
                {
                    e.printStackTrace();
                }
                
            }
        }
        catch (ParserConfigurationException e)
        {
            e.printStackTrace();
        }
        System.out.println("DOM成功创建XML文档!");
    }
}

需要注意的地方就是，Node 的类型，可能是 ELEMRNT_NODE,TEXT_NODE......，不同类型的节点添加方式略有不同。

3  生成的xml文档截图如下