JDOM方式解析、创建XML文件（实例）

问：JDOM如何解析XML文件？

JDOM是一个开源项目，它基于树型结构，利用纯JAVA的技术对XML文档实现解析、生成、序列化以及多种操作

问：使用JDOM需要什么条件？

使用JDOM方式解析XML文档，需要在工程文件中导入jdom.jar包 下载地址

（1）示例代码：

import org.jdom.Document;import org.jdom.Element;import org.jdom.input.SAXBuilder;import org.jdom.output.Format;import org.jdom.output.XMLOutputter;import org.jdom.xpath.XPath;public class JDomResolve {    public static void main(String[] args) throws IOException{        String file = "file/books.xml";        InputStream inputStream = new FileInputStream(file);        JDomResolve jDomResolve = new JDomResolve();        //1.JDOM方式解析xml文件        try {            List<Book> bookList = jDomResolve.getBooks(inputStream);            for(Book book : bookList ){                System.out.println(book.toString());            }        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        //2.JDOM方式创建xml文件        jDomResolve.jDomCreateXml();    }    /**     * JDom方式解析xml     */    public List<Book> books = new ArrayList<Book>();    public Book book = new Book();    public List<Book> getBooks(InputStream inputStream) throws Exception{         //创建SAXBuilder实例        SAXBuilder sb = new SAXBuilder();        //获取document        Document document = sb.build(inputStream);        //获取根节点        Element rootElement = document.getRootElement();        //获取bookList        List listElement =  XPath.selectNodes(rootElement, "//bookstore/book");        //循环取值（枚举）        for(Iterator it = listElement.iterator();it.hasNext();){            Element bookElement = (Element) it.next();            String id = bookElement.getAttributeValue("id");            String name = bookElement.getChildText("bookName");            String author = bookElement.getChildText("author");            String year = bookElement.getChildText("year");            book.setId(Integer.parseInt(id));            book.setBookName(name);            book.setAuthor(author);            book.setYear(year);            books.add(book);            book=new Book();        }        return books;    }    /**     * JDom方式创建xml文件     */    public void jDomCreateXml() throws FileNotFoundException, IOException {        //创建document文档节点        Document document = new Document();        //创建根节点        Element bookstore = new Element("bookstore");        //将bookstore添加到document下        document.addContent(bookstore);        //创建子节点        Element book = new Element("book");        //添加属性        book.setAttribute("id", "1");        //将子节点添加到根节点下        bookstore.addContent(book);        //创建子节点        Element name = new Element("name");        name.setText("冰与火之歌");        Element author = new Element("author");        author.setText("乔治马丁");        Element year = new Element("year");        year.setText("2004");        Element price = new Element("price");        price.setText("89");        //将子节点添加到book下        book.addContent(name);        book.addContent(author);        book.addContent(year);        book.addContent(price);        //将创建的xml文档写到流中        XMLOutputter out = new XMLOutputter();        //设置生成xml文档的格式        Format format = Format.getCompactFormat();        //自定义xml文档的缩进        format.setIndent("  ");        out.setFormat(format);        out.output(document, new FileOutputStream("file/cjdom.xml"));    }}

（2）Book实体类代码：

public class Book {    private int id; //id-book    private String bookName;//书名    private String author;//作者    private String year;//年份    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getBookName() {        return bookName;    }    public void setBookName(String bookName) {        this.bookName = bookName;    }    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;    }    @Override    public String toString() {        return this.id+"---"+this.bookName+"---"+this.author+"---"+this.year;    }}

（3）创建的cjdom.xml代码截图：