×××还有，请问大家，JDOM的问题我去哪个论坛问问题比较好，麻烦大家了，我是新手，不好意思：）×××××

程序如下：
import org.jdom.*;
import org.jdom.output.*;
import org.jdom.input.*;
import java.io.*;
public class testJDOM
{
public static void main
(String args[])throws Exception
{
SAXBuilder sb = new SAXBuilder();
//从文件构造一个Document，因为XML文件中已经指定了编码，所以这里不必了
Document doc = sb.build(new
FileInputStream("exampleA.xml"));
//加入一条处理指令
ProcessingInstruction pi =
new ProcessingInstruction
("xml-stylesheet","href=\"bookList.html.xsl\" type=\"text/xsl\"");
doc.addContent(pi);
Element root = doc.getRootElement();
//得到根元素
java.util.List books = root.getChildren();
//得到根元素所有子元素的集合
Element book = (Element)books.get(0);
//得到第一个book元素
//为第一本书添加一条属性
Attribute a = new Attribute("hot","true");  
book.setAttribute(a);
Element author = book.getChild("author");
//得到指定的字元素
//author.setText("王五");
//将作者改为王五
Text t = new Text("王五");
book.addContent(t);
Element price = book.getChild("price");
//得到指定的字元素
//修改价格，比较郁闷的是我们必须自己转换数据类型，而这正是JAXB的优势
author.setText(Float.toString(50.0f));
String indent = "    ";
boolean newLines = true;
//XMLOutputter outp = new XMLOutputter(indent,newLines,"GBK");
//outp.output(doc,new FileOutputStream("exampleB.xml"));
XMLOutputter xmlout = new XMLOutputter (indent,newLines,"gb2312");
xmlout.output(doc, new FileOutputStream("exampleB.xml"));
}
};