XML文件写入,4-4课后作业,使用rss写入xml文件

//Book类
package com.imooc.entity;

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;
}

}

//DOM4Jtest类
package com.imooc.dom4jtest;

import com.imooc.entity.Book;
import org.dom4j.*;

import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import java.io.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class DOM4JTest {
private static ArrayList<Book> booksList = new ArrayList<Book>();

private void parseXML() {
    //解析books.xml文件
    //创建SAXReader的对象reader
    SAXReader reader = new SAXReader();
    try {
        //通过reader对象的read方法加载books.xml文件,获取document对象
        Document document = (Document) reader.read(new File("src/resource/books.xml"));
        //通过document对象获取根节点bookStore
        Element bookStore = (Element) document.getRootElement();
        //element对象的elementIterator方法获取迭代器
        Iterator it = bookStore.elementIterator();
        //遍历迭代器,获取根节点中的信息(书籍)
        while (it.hasNext()) {
            Book bookentity = new Book();
            System.out.println("==============开始遍历某一本书================");
            Element book = (Element) it.next();
            //获取book的属性名以及属性值
            List<Attribute> bookAttrs = book.attributes();
            for (Attribute attr : bookAttrs) {
                System.out.println("属性名: " + attr.getName() + "--属性值: " + attr.getValue());
                if (attr.getName().equals("id")) {
                    bookentity.setId(attr.getName() + "=" + attr.getValue());
                }
            }

            Iterator itt = book.elementIterator();
            while (itt.hasNext()) {
                //获取book标签的子节点
                Element bookChild = (Element) itt.next();
                System.out.println("节点名: " + bookChild.getName() + "--节点值: " + bookChild.getStringValue());
                if (bookChild.getName().equals("name")) {
                    bookentity.setName(bookChild.getStringValue());
                } else if (bookChild.getName().equals("author")) {
                    bookentity.setAuthor(bookChild.getStringValue());
                } else if (bookChild.getName().equals("year")) {
                    bookentity.setYear(bookChild.getStringValue());
                } else if (bookChild.getName().equals("price")) {
                    bookentity.setPrice(bookChild.getStringValue());
                } else if (bookChild.getName().equals("language")) {
                    bookentity.setLanguage(bookChild.getStringValue());
                }
            }
            booksList.add(bookentity);
            bookentity = null;

            System.out.println("==============结束遍历某一本书================");
            System.out.println("现在有: " + booksList.size() + "本书");

            for (Book books : booksList) {
                System.out.println(books.getId());
                System.out.println(books.getName());
                System.out.println(books.getAuthor());
                System.out.println(books.getYear());
                System.out.println(books.getPrice());
                System.out.println(books.getLanguage());
            }
        }
    } catch (DocumentException e) {
        e.printStackTrace();
    }
}

private void createXML() {
    //1.创建document对象,代表整个xml文档
    Document document = DocumentHelper.createDocument();
    //2.创建根节点rss
    Element rss = document.addElement("rss");
    //3.向rss节点中添加version属性
    rss.addAttribute("version", "2.0");
    //4.生成子节点及节点内容
    Element channel = rss.addElement("channel");
    Element title = channel.addElement("title");
    title.setText("国内最新新闻");

    Element image = channel.addElement("image");
    Element title1 = image.addElement("title");
    title1.setText("news.baidu.com");
    Element link = image.addElement("link");
    link.setText("http://news.baidu.com");
    Element url = image.addElement("url");
    url.setText("http://news.baidu.com/img/logo-news.gif");

    Element description = channel.addElement("description");
    description.setText("百度新闻订阅");
    Element link1 = channel.addElement("link");
    link1.setText("http://news.baidu.com");

    Element language = channel.addElement("language");
    language.setText("zh-cn");

    Element docs = channel.addElement("docs");
    docs.setText("http://blogs.law.harvard.edu/tech/rss");

    Element generator = channel.addElement("generator");
    generator.setText("www.baidu.com");

    Element ttl = channel.addElement("ttl");
    ttl.setText("5");

    Element item = channel.addElement("item");
    Element title2 = item.addElement("title");
    title2.setText("<![CDATA[上海移动互联网产业促进中心正式揭牌]]>");
    Element link2 = item.addElement("link");
    link2.setText("----------------结束-----------------");
    //5.设置生成xml的格式,使节点换行并缩进
    OutputFormat format = OutputFormat.createPrettyPrint();
    format.setEncoding("GBK");
    //6.生成xml文件
    File file = new File("rssnews.xml");
    try {
        XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);
        //设置是否对"<>"进行转义,默认值是true,代表转义
        writer.setEscapeText(false);
        writer.write(document);
        writer.close();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public static void main(String[] args) {
    new DOM4JTest().createXML();

}

}