/**
 *Book类
 */
package com.imooc.xmlText;

public class Book {
    private String id;
    private String name;
    private String author;
    private String year;
    private String price;
    private String language;

    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getYear() {
        return year;
    }

    public void setYear(String year) {
        this.year = year;
    }

    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price;
    }

    public String getLanguage() {
        return language;
    }

    public void setLanguage(String language) {
        this.language = language;
    }
}

package com.imooc.xmlText;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
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 java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class DOMTest1 {
    public static void main(String[] args) throws ParserConfigurationException, IOException, SAXException, TransformerException {
        DocumentBuilderFactory documentBuilderFactory=DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder=documentBuilderFactory.newDocumentBuilder();
        //解析xml文件
        Document document=documentBuilder.parse("demo/books1.xml");
        NodeList bookList= document.getElementsByTagName("book");
        Book newBook=new Book();
        List<Book> newBookList=new ArrayList<Book>();
        System.out.println("共有"+bookList.getLength()+"本书");
        for(int i=0;i<bookList.getLength();i++){
            Node book=bookList.item(i);
            NamedNodeMap attrs= book.getAttributes();
            for(int j=0;j<attrs.getLength();j++){
                Node attr=attrs.item(j);
                newBook.setId(attr.getNodeValue());
                System.out.println(attr.getNodeName()+":"+attr.getNodeValue());}
            NodeList childList=book.getChildNodes();
            for(int m=0;m<childList.getLength();m++){
                Node child=childList.item(m);
                if(child.getNodeType()==Node.ELEMENT_NODE){
                    switch(child.getNodeName()){
                        case "name":
                            newBook.setName(child.getTextContent());
                            break;
                        case "author":
                            newBook.setAuthor(child.getTextContent());
                            break;
                        case "year":
                            newBook.setYear(child.getTextContent());
                            break;
                        case "price":
                            newBook.setPrice(child.getTextContent());
                            break;
                        case "language":
                            newBook.setLanguage(child.getTextContent());
                            break;
                    }
                    System.out.println(child.getNodeName()+":"+child.getTextContent());}
            }
            newBookList.add(newBook);
            newBook=new Book();
        }
        System.out.println("共有"+newBookList.size()+"本书");
        for (Book book:newBookList) {
            System.out.println("第"+book.getId()+"本书");
            System.out.println("Name:"+book.getName());
            System.out.println("Author:"+book.getAuthor());
            System.out.println("Year:"+book.getYear());
            System.out.println("Price:"+book.getPrice());
            System.out.println("Language:"+book.getLanguage());
            System.out.println("----finish----");
        }
        //生成xml文件
        Document newDocument=documentBuilder.newDocument();
        Element bookstore=newDocument.createElement("bookstore");
        for(int i=0;i<newBookList.size();i++) {
            Book bookValue=newBookList.get(i);
            Element book = newDocument.createElement("book");
            book.setAttribute("id",bookValue.getId() );
            if(bookValue.getName()!=null&&!bookValue.getName().trim().equals("")){
            Element name=newDocument.createElement("name");
            name.setTextContent(bookValue.getName());
            book.appendChild(name);}
            if(bookValue.getAuthor()!=null&&!bookValue.getAuthor().trim().equals("")){
            Element author=newDocument.createElement("author");
            author.setTextContent(bookValue.getAuthor());
            book.appendChild(author);}
            if(bookValue.getYear()!=null&&!bookValue.getYear().trim().equals("")){
            Element year=newDocument.createElement("year");
            year.setTextContent(bookValue.getYear());
            book.appendChild(year);}
            if(bookValue.getPrice()!=null&&!bookValue.getPrice().trim().equals("")){
            Element price=newDocument.createElement("price");
            price.setTextContent(bookValue.getPrice());
            book.appendChild(price);}
            if(bookValue.getLanguage()!=null&&!bookValue.getLanguage().trim().equals("")){
            Element language=newDocument.createElement("language");
            language.setTextContent(bookValue.getLanguage());
            book.appendChild(language);}
            bookstore.appendChild(book);
        }
        newDocument.appendChild(bookstore);
        TransformerFactory transformerFactory=TransformerFactory.newInstance();
        Transformer transformer=transformerFactory.newTransformer();
        transformer.setOutputProperty(OutputKeys.INDENT,"yes");
        transformer.transform(new DOMSource(newDocument),new StreamResult(new File("demo1/books0.xml")));




    }

}