JDOM操作XML文件(法老修正版)

技术2022-05-11 47

这篇文章讲的不错~把JDOM的基本操作实例化了,不过由于当时的作者用的JDOM版本还比较陈旧,所以部分代码会编译出错！支持中文也不好！所以,法老在原作者的基础上对程序做了修改！休正了编译出错以及中文乱码的问题。发表出来，供大家学习和使用。测试环境：jdom1.0，weblogic 8.1sp2，tomcat 5.0，IE 6。0 /==================================正文开始=======================================/ 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Jason Hunter有一篇精彩的演讲介绍了JDOM技术，题目就是JDOM Makes XML Easy。获得并安装JDOM 在http://jdom.org可以下载JDOM的最新版本。以 JDOM 1.0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DOM Level 2。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.xml <?xml version="1.0" encoding="utf-8"?><书库> <书> <书名>Java编程入门</书名> <作者>张三</作者> <出版社>电子出版社</出版社> <价格>35.0</价格> <出版日期>2002-10-07</出版日期> </书> <书> <书名>XML在Java中的应用</书名> <作者>李四</作者> <出版社>希望出版社</出版社> <价格>92.0</价格> <出版日期>2002-10-07</出版日期> </书></书库>

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<%@ page contentType="text/html;charset=GBK"%><%@ page language="java" import="java.util.*,jdom.test.*"%><html><head><title>读取XML文件资料</title></head><body><h3 align="center">JDOM操作XML文件</h3><p align="center">读取XML文件中的所有资料</p><center><table border="1" cellpadding="0" cellspacing="1" style="border-collapse: collapse" width="80%" id="AutoNumber1"> <tr> <td align="center" width="92">书名</td> <td align="center" width="92">作者</td> <td align="center" width="92">出版社</td> <td align="center" width="92">价格</td> <td align="center" width="92">出版日期</td> <td align="center" width="94">操作</td> </tr></table><% 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()+"<br>"); out.println("作者:"+xml.getauthor()+"<br>"); out.println("出版社:"+xml.getpub()+"<br>"); out.println("价格:"+xml.getprice()+"<br>"); out.println("出版日期:"+xml.getpubdate()+"<br><br>"); */%><table border="1" cellpadding="0" cellspacing="1" style="border-collapse: collapse" width="80%" id="AutoNumber2"> <tr> <td align="center" width="92"><%=xml.getbookname()%></td> <td align="center" width="92"><%=xml.getauthor()%></td> <td align="center" width="92"><%=xml.getpub()%></td> <td align="center" width="92"><%=xml.getprice()%></td> <td align="center" width="92"><%=xml.getpubdate()%></td> <td align="center" width="94"><a href="xmlaction.jsp?act=del&id=<%=i%>&path=<%=path%>">删除</a></td> </tr></table><%}%></center><form method="POST" action="xmlaction.jsp"><p align="center"><input type="radio" value="add" checked name="act">添加资料<input type="radio" value="edit" name="act">编辑资料序号:<select size="1" name="id"> <%for (int i = 0; i < xmlall.size(); i++) {%> <option value="<%=i%>">第<%=i + 1%>条</option> <%}%></select><br>书名:<input type="text" name="bookname" size="20"><br>作者:<input type="text" name="author" size="20"><br>出版社:<input type="text" name="pub" size="20"><br>价格:<input type="text" name="price" size="20"><br>日期:<input type="text" name="pubdate" size="20"></p><input type="hidden" name="path" value="<%=path%>"><p align="center"><input type="submit" value="提交" name="B1"><input type="reset" value="重置" name="B2"></p></form></body></html>下面是处理上一文件提交的jsp文件: xmlation.jsp<%@ page contentType="text/html;charset=GBK"%><%@ page language="java" import="jdom.test.*"%><%if (request.getParameter("act") != null && request.getParameter("act").equals("add")) { XmlBean.AddXML(request); out.println("<p align='center'><br><br>添加成功<br><br><a href='test.jsp'>返回</a>"); } else if (request.getParameter("act") != null && request.getParameter("act").equals("del")) { XmlBean.DelXML(request); out.println("<p align='center'><br><br>删除成功<br><br><a href='test.jsp'>返回</a>"); } else if (request.getParameter("act") != null && request.getParameter("act").equals("edit")) { XmlBean.EditXML(request); out.println("<p align='center'><br><br>修改成功<br><br><a href='test.jsp'>返回</a>"); } else { out.print("<p align='center'><br><br>非法操作<br><br><a href='test.jsp'>返回</a>"); }%>/===============================正文结束========================================/备注：1，XmlBean.java 文件里法老注名文字为黄色的部分,是修改的地方,紫色引掉的部分是原程序的写法!2，MyXml.xml 文件的默认编码法老改成了 encoding="utf-8" 的原因是:在weblogic 8下面解析GBK或者GB2312的时候总是异常，tomcat是好的，可能是weblogic自己默认的xml解析器不支持GBK吧,这个问题一直没搞好~如果哪位高手晓得解决方法，请回复此贴告诉我~~谢谢大家！

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