JDOM操作XML文件-详细.doc

JDOM操作XML文件Java+XML=JDOM！这就是JDOM设计者的目标。如果你曾经使用过烦人的SAX或是DOM来处理XML，你就会知道为什么要有JDOM或者是JAXB。在今年（2002）的JavaOne会议上JDOM的主要创始人JasonHunter有一篇精彩的演讲介绍了JDOM技术，题目就是JDOMMakesXMLEasy。获得并安装JDOM在可以下载JDOM的最新版本。以JDOM1.0的2进制版本为例。下载后解压缩，JDOM的jar文件就是build目录下的文件jdom.jar，将之加入类路径。另外JDOM还需要lib目录下那些jar文件如xerces.jar,jaxp.jar的支持。如果在使用中出现以下错误：java.lang.NoSuchMethodError或java.lang.NoClassDefFoundError:org/xml/sax/SAXNotRecognizedException你需要保证xerces.jar文件在CLASSPATH中位于其他XML类，如JAXP或Crimson之前，这些类文件，包括以前老版本的xerces，可能不支持SAX2.0或DOMLevel2。于是导致了上面的错误。一个简单的例子JDOM的处理方式有些类似于DOM，但它主要是用SAX实现的，你不必担心处理速度和内存的问题。另外，JDOM中几乎没有接口，的类全部是实实在在的类，没有类工厂类的。下面是实例用的XML文件: MyXml.xmlJava编程入门张三电子出版社35.02002-10-07XML在Java中的应用李四希望出版社92.02002-10-07 下面是操作XML文件的Bean: XmlBean.javapackage jdom.test;/* XML的读写操作Bean*/import java.io.*;import java.util.*;import org.jdom.*;import org.jdom.output.*;import org.jdom.input.*;import javax.servlet.*;import javax.servlet.http.*;public class XmlBean private String bookname, author, pub, price, pubdate;public String getbookname() return bookname;public String getauthor() return author;public String getpub() return pub;public String getprice() return price;public String getpubdate() return pubdate;public void setbookname(String bookname) this.bookname = bookname;public void setauthor(String author) this.author = author;public void setpub(String pub) this.pub = pub;public void setprice(String price) this.price = price;public void setpubdate(String pubdate) this.pubdate = pubdate;public XmlBean() /* 读取XML文件所有信息*/public Vector LoadXML(String path) throws Exception Vector xmlVector = null;FileInputStream fi = null;try fi = new FileInputStream(path);xmlVector = new Vector();SAXBuilder sb = new SAXBuilder();Document doc = sb.build(fi);Element root = doc.getRootElement(); / 得到根元素List books = root.getChildren(); / 得到根元素所有子元素的集合Element book = null;XmlBean xml = null;for (int i = 0; i books.size(); i+) xml = new XmlBean();book = (Element) books.get(i); / 得到第一本书元素xml.setbookname(book.getChild(书名).getText();xml.setauthor(book.getChild(作者).getText();xml.setpub(book.getChild(出版社).getText();xml.setprice(book.getChild(价格).getText();xml.setpubdate(book.getChild(出版日期).getText();xmlVector.add(xml); catch (Exception e) System.err.println(e + error); finally try fi.close(); catch (Exception e) e.printStackTrace();return xmlVector;/* 删除XML文件指定信息*/public static void DelXML(HttpServletRequest request) throws Exception FileInputStream fi = null;FileOutputStream fo = null;try request.setCharacterEncoding(GBK);String path = request.getParameter(path);int xmlid = Integer.parseInt(request.getParameter(id);fi = new FileInputStream(path);SAXBuilder sb = new SAXBuilder();Document doc = sb.build(fi);Element root = doc.getRootElement(); / 得到根元素List books = root.getChildren(); / 得到根元素所有子元素的集合books.remove(xmlid);/ 删除指定位置的子元素/String indent = ;/boolean newLines = true;/XMLOutputter outp = new XMLOutputter(indent, newLines, GBK);Format format = Format.getPrettyFormat();format.setIndent();format.setEncoding(utf-8);XMLOutputter outp = new XMLOutputter(format);fo = new FileOutputStream(path);outp.output(doc, fo); catch (Exception e) System.err.println(e + error); finally try fi.close();fo.close(); catch (Exception e) e.printStackTrace();/* 添加XML文件指定信息*/public static void AddXML(HttpServletRequest request) throws Exception FileInputStream fi = null;FileOutputStream fo = null;try request.setCharacterEncoding(GBK);String path = request.getParameter(path);fi = new FileInputStream(path);SAXBuilder sb = new SAXBuilder();Document doc = sb.build(fi);Element root = doc.getRootElement(); / 得到根元素List books = root.getChildren(); / 得到根元素所有子元素的集合String bookname = request.getParameter(bookname);String author = request.getParameter(author);String price = request.getParameter(price);String pub = request.getParameter(pub);String pubdate = request.getParameter(pubdate);/Text newtext;Element newbook = new Element(书);Element newname = new Element(书名);newname.setText(bookname);newbook.addContent(newname);Element newauthor = new Element(作者);newauthor.setText(author);newbook.addContent(newauthor);Element newpub = new Element(出版社);newpub.setText(pub);newbook.addContent(newpub);Element newprice = new Element(价格);newprice.setText(price);newbook.addContent(newprice);Element newdate = new Element(出版日期);newdate.setText(pubdate);newbook.addContent(newdate);books.add(newbook);/ 增加子元素/String indent = ;/boolean newLines = true;/XMLOutputter outp = new XMLOutputter(indent, newLines, GBK);Format format = Format.getPrettyFormat();format.setIndent();format.setEncoding(utf-8);XMLOutputter outp = new XMLOutputter(format);fo = new FileOutputStream(path);outp.output(doc, fo); catch (Exception e) System.err.println(e + error); finally try fi.close();fo.close(); catch (Exception e) e.printStackTrace();/* 修改XML文件指定信息*/public static void EditXML(HttpServletRequest request) throws Exception FileInputStream fi = null;FileOutputStream fo = null;try request.setCharacterEncoding(GBK);String path = request.getParameter(path);int xmlid = Integer.parseInt(request.getParameter(id);fi = new FileInputStream(path);SAXBuilder sb = new SAXBuilder();Document doc = sb.build(fi);Element root = doc.getRootElement(); / 得到根元素List books = root.getChildren(); / 得到根元素所有子元素的集合Element book = (Element) books.get(xmlid);String bookname = request.getParameter(bookname);String author = request.getParameter(author);String price = request.getParameter(price);String pub = request.getParameter(pub);String pubdate = request.getParameter(pubdate);/Text newtext;Element newname = book.getChild(书名);newname.setText(bookname);/ 修改书名为新的书名Element newauthor = book.getChild(作者);newauthor.setText(author);Element newpub = book.getChild(出版社);newpub.setText(pub);Element newprice = book.getChild(价格);newprice.setText(price);Element newdate = book.getChild(出版日期);newdate.setText(pubdate);/ books.set(xmlid,book);/修改子元素/String indent = ;/boolean newLines = true;/XMLOutputter outp = new XMLOutputter(indent, newLines, GBK);Format format = Format.getPrettyFormat();format.setIndent();format.setEncoding(utf-8);XMLOutputter outp = new XMLOutputter(format);fo = new FileOutputStream(path);outp.output(doc, fo); catch (Exception e) System.err.println(e + error); finally try fi.close();fo.close(); catch (Exception e) e.printStackTrace();下面是操作的jsp文件: test.jsp读取XML文件资料JDOM操作XML文件读取XML文件中的所有资料书名作者出版社价格出版日期操作%String path = application.getRealPath(/JDOM/MyXml.xml);XmlBean xml = new XmlBean();Vector xmlall = xml.LoadXML(path);for (int i = 0; i xmlall.size(); i+) xml = (XmlBean) xmlall.elementAt(i);/*out.println(书名:+xml.getbookname()+);out.println(作者:+xml.getauthor()+);out.println(出版社:+xml.getpub()+);out.println(价格:+xml.getprice()+);out.println(出版日期:+xml.getpubdate()+);*/%ahref=xmlaction.jsp?act=del&id=&path=删除添加