addbook.java

XML课件非常好的东西 如果你不了解XML看看非常有用

import java.io.*;
import org.w3c.dom.*;
import org.w3c.dom.Node;
import org.xml.sax.*;
import javax.xml.parsers.*;

public class AddBook
{
  String id = null;
  String title = null;
  String author = null;
  public void setAll(String s1,String s2,String s3) 
  {
  	id = s1;
  	title = s2;
  	author = s3;
  }
  public void addBook(Document doc)
  {
    Element eBook = doc.createElement("book");
    Element eId = doc.createElement("id");
    Element eTitle = doc.createElement("title");
    Element eAuthor = doc.createElement("author");
    
    Text tId = doc.createTextNode(id);
    Text tTitle = doc.createTextNode(title);
    Text tAuthor = doc.createTextNode(author);
    
    Node nId = eBook.appendChild(eId).appendChild(tId);
    Node nTitle = eBook.appendChild(eTitle).appendChild(tTitle);
    Node nAuthor = eBook.appendChild(eAuthor).appendChild(tAuthor);
    Element root = doc.getDocumentElement();
    Node nBook = root.appendChild(eBook);
    
  }
  public void printDOC(Document doc)
  {
    NodeList nl = doc.getElementsByTagName("*");
    Element e;
    int len;
    len = nl.getLength();
    for (int j=0;j < len;j++)
    {
      e = (Element)nl.item(j);
      System.out.println(e.getTagName()+":"+e.getFirstChild().getNodeValue());
    }
  }
  static public void main(String[] argv)
  {
    try
    {
      if (argv.length != 3)
      {
        System.err.println("格式: java AddBook 编号 书名 作者");
        System.exit(1);
      }
      DocumentBuilderFactory dbfactory = DocumentBuilderFactory.newInstance();
      DocumentBuilder domparser = dbfactory.newDocumentBuilder();
      Document doc = domparser.parse(new File("library.xml"));        
      AddBook ab = new AddBook();
      ab.setAll(argv[0],argv[1],argv[2]);
      ab.addBook(doc);
      ab.printDOC(doc);
    }
    catch (ParserConfigurationException p)
    {
      System.out.println(p.toString());
    }
    catch (SAXException s)
    {
      System.out.println(s.toString());
    }
    catch (IOException e)
    {
      System.out.println(e.toString());
    }
  }
}