//exampleA.xml
<?xml version="1.0"
encoding="GBK"?>
<bookList>
<book>
<name>Java编程入门</name>
<author>张三</author>
<publishDate>2002-6-6</publishDate>
<price>35.0</price>
</book>
<book>
<name>XML在Java中的应用</name>
<author>李四</author>
<publishDate>2002-9-16</publishDate>
<price>92.0</price>
</book>
</bookList>
//testJDOM.java
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
//或 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"));
}
}; |
