现有以下XML文档books.xml,下面的示例生成此文档部分内容
<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
<book id="1">
<name>冰与火之歌</name>
<author>乔治马丁</author>
<year>2014</year>
<price>89</price>
</book>
<book id="2">
<name>安徒生童话</name>
<year>2004</year>
<price>77</price>
<language>English</language>
</book>
</bookstore>
DOM
1、创建DocumentBuilder对象
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
2、添加节点
document.setXmlStandalone(true);
Element bookstore = document.createElement("bookStore");
//向bookstore根节点中添加子节点book
Element book = document.createElement("book");
Element name = document.createElement("name");
name.setTextContent("???");
book.appendChild(name);
book.setAttribute("id", "1");
//将book节点添加到bookstore根节点中
bookstore.appendChild(book);
//将bookstore节点（已经包含了book）添加到dom树中
document.appendChild(bookstore);
3、生成xml文件
TransformerFactory tff = TransformerFactory.newInstance();
Transformer tf = tff.newTransformer();
//设置文件
tf.setOutputProperty(OutputKeys.INDENT, "yes");
tf.transform(new DOMSource(document),new StreamResult(new File("books1.xml")));
SAX
1、创建一个TransformerFactory类的对象
SAXTransformerFactory tff = (SAXTransformerFactory) SAXTransformerFactory.newsInstance();
2、通过SAXTransformerFactory对象创建一个TransformerHandler对象
TransformerHandler handler = tff.newTransformerHandler();
3、通过handler对象创建一个Transformer对象
Transformer tr = handler.getTransformer();
4、通过Transformer对象对生成的xml文件进行设置
// 设置xml的编码
tr.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
// 设置xml的“是否换行”
tr.setOutputProperty(OutputKeys.INDENT, "yes");
5、创建一个Result对象
```java
File f = new File("newbooks.xml");
if (!f.exists()) {
f.createNewFile();
}
6、创建Result对象，并且使其与handler关联
Result result = new StreamResult(new FileOutputStream(f));
handler.setResult(result);
7、利用handler对象进行xml文件内容的编写O
// 打开document
handler.startDocument();
8、添加节点属性和节点值
AttributesImpl attr = new AttributesImpl();
handler.startElement("", "", "bookstore", attr);
for (Book book : bookList) {
attr.clear();
attr.addAttribute("", "", "id", "", book.getId());
handler.startElement("", "", "book", attr);
// 创建name节点
if (book.getName() != null && !book.getName().trim().equals("")) {
attr.clear();
handler.startElement("", "", "name", attr);
handler.characters(book.getName().toCharArray(), 0, book
.getName().length());
handler.endElement("", "", "name");
}
handler.endElement("", "", "book");
}
handler.endElement("", "", "bookstore");
// 关闭document
handler.endDocument();
JDOM
1.生成一个根节点
Element rss = new Element("rss");
2.为节点添加属性
rss.setAttribute("version", "2.0");
3.生成一个document对象
Document document = new Document(rss);
Element channel = new Element("channel");
rss.addContent(channel);
Element title = new Element("title");
title.setText("<![CDATA[上海移动互联网产业促进中心正式揭牌 ]]>");
channel.addContent(title);
//设置文件编码和换行
Format format = Format.getCompactFormat();
format.setIndent("");
format.setEncoding("GBK");
4.创建XMLOutputter的对象
XMLOutputter outputer = new XMLOutputter(format);
5.利用outputer将document对象转换成xml文档
outputer.output(document, new FileOutputStream(new File("rssnews.xml")));
DOM4J
使用DOM4J生成RSS文件
1.创建document对象，代表整个xml文档
Document document = DocumentHelper.createDocument();
2.创建根节点rss
Element rss = document.addElement("rss");
3.向rss节点中添加version属性
rss.addAttribute("version", "2.0");
4.生成子节点及节点内容
Element channel = rss.addElement("channel");
Element title = channel.addElement("title");
title.setText("<![CDATA[上海移动互联网产业促进中心正式揭牌 ]]>");
5.设置生成xml的格式
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("GBK");
6.生成xml文件
File file = new File("rssnews.xml");
XMLWriter writer;
writer = new XMLWriter(new FileOutputStream(file), format);
//设置是否转义，默认值是true，代表转义
writer.setEscapeText(false);
writer.write(document);
writer.close();
