用做示例的XML文件如下：exampleA.xml
<?xml version="1.0" encoding="GB2312"?>
<bookList>
<book hot1="true">
<author>王五</author>
<name>Java编程入门</name>
<publishDate>2002-6-6</publishDate>
<price amount="15.00" currency="USD">50.0</price>
<price amount="7.75" currency="GBP" />
<price amount="30000.00" currency="MXP" />
<add sku="123456">add</add>
<attribute sku="123456" sf234="123456" />
<add sku="123456">add</add>
<attribute sku="123456" sf234="123456" />
</book>
<book>
<name>XML在Java中的应用</name>
<author>李四</author>
<publishDate>2002-9-16</publishDate>
<price amount="15.00" currency="USD" />
<price amount="7.75" currency="GBP" />
<price amount="30000.00" currency="MXP" />
</book>
</bookList>
<?xml-stylesheet href="bookList.html.xsl" type="text/xsl"?>
接下来就是在jsp中来调用这两个javabean实现对XML的操作，jsp文件的代码如下：
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="org.jdom.*" %>
<%@ page import="org.jdom.output.*" %>
<%@ page import="org.jdom.input.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="XML.*" %>
<%
//xml文件的路径（绝对路径）
String fileName="exampleA.xml";
String aa=getServletContext().getRealPath("/")+"jdom\\";
String trace=aa+fileName;
//初始化读写的bean
XML.readXML readXmlBean = new XML.readXML();
XML.writeXML writeXmlBean = new XML.writeXML();
//从xml文件中得到相关数据
Document doc;
readXmlBean.readXML(trace);
doc=readXmlBean.getXmlDoc();
//加入一条处理指令
ProcessingInstruction pi = new ProcessingInstruction
("xml-stylesheet","href=\"bookList.html.xsl\" type=\"text/xsl\"");
doc.addContent(pi);
//得到根元素
Element root = doc.getRootElement();
//得到根元素所有子元素的集合
java.util.List books = root.getChildren();
//得到第一个book元素
Element book = (Element)books.get(0);
//为第一本书添加一条属性
Attribute a = new Attribute("hot1","true");
book.setAttribute(a);
//得到指定的字元素
Element author = book.getChild("author");
//将作者改为王五
author.setText("王五");
//得到指定的字元素
Element price = book.getChild("price");
//修改价格
price.setText(Float.toString(50.0f));
//叠代显示所有元素
Iterator it = books.iterator();
while (it.hasNext()) {
Element e = (Element) it.next();
out.println(e.getChild("name").getTextTrim()+"<br>");
List priceElements = e.getChildren("price");
Iterator it2 = priceElements.iterator();
while (it2.hasNext()) {
Element pe = (Element) it2.next();
out.println(pe.getAttributeValue("currency")+"<br>");
out.println(pe.getAttributeValue("amount")+"<br>");
}
}
//指令操作
String target = pi.getTarget();
String data = pi.getData();
String type = pi.getValue("type");
out.println(target+"<br>"+data+"<br>"+type+"<br>");
//删除属性
book.removeAttribute("hot");
//删除指令
doc.removeContent(pi);
//新增节点
Element add = new Element("add");
a= new Attribute("sku","123456");
add.setAttribute(a);
add.addContent("add");
book.addContent(add);
//没有内容只有属性的节点
Element attr = new Element("attribute");
a= new Attribute("sku","123456");
attr.setAttribute(a);
a= new Attribute("sf234","123456");
attr.setAttribute(a);
book.addContent(attr);
//删除节点
book.removeContent(attr);
book.removeContent(add);
//写入XML文件
writeXmlBean.writeXML(doc,trace);
%>
这个例子里包括了一般的增加、删除、修改节点和属性和指令以及显示XML数据等一般的XML文件操作。如果只是纯粹的显示数据的话建议把所有的取数据操作到放到javabean里去，jsp页面只是显示一下结果，这样可以提高运行的速度，减少出错的概率：）
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