JDOM操作XML文件(法老修正版)

    技术2022-05-11  19

    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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