Geneate xml with dom

Dom level 3を用いたXML生成方法を紹介する。
ここでは最新のXerces2.9.1とJDK1.5を前提としている。
その為、exampleを実行する為にはxercesImpl.jarとserializer.jarが必要となる。

例として、次の簡単なxmlを作成してみよう。

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE USERS SYSTEM "users.dtd">
<USERS>
  <USER ID="PWD122" TYPE="customer">Tim@Home</USER>
  <USER ID="MX787" TYPE="manager">Jack&amp;Moud</USER>
  <USER ID="A4Q45" TYPE="employee">John D&apos;oé</USER>
</USERS>

以下にソースの一部分を示す。

..............省略.....................
public static void generateXmlWithDom(OutputStream out) throws Exception {
 
        DOMImplementation impl = DOMImplementationImpl.getDOMImplementation();
        //set DOCTYPE ( dtd )
        DocumentType doctype = impl.createDocumentType("users", null, "users.dtd");
        Document xmldoc = impl.createDocument(null, null, doctype);
 
	// Root element.
	Element root = xmldoc.createElement("USERS");
	String[] id = {"PWD122","MX787","A4Q45"};
	String[] type = {"customer","manager","employee"};
	String[] desc = {"Tim@Home","Jack&Moud","John D'o"};
	for (int i=0;i<id.length;i++)
	{
	        // Child i.
		e = xmldoc.createElementNS(null, "USER");
		e.setAttributeNS(null, "ID", id[i]);
		e.setAttributeNS(null, "TYPE", type[i]);
		n = xmldoc.createTextNode(desc[i]);
		e.appendChild(n);
		root.appendChild(e);
	}
 
	xmldoc.appendChild(root);
 
	// Xml serialization
	DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
	DOMImplementationLS ls = (DOMImplementationLS) registry.getDOMImplementation("LS");
 
	LSSerializer writer = ls.createLSSerializer();
	LSOutput output = ls.createLSOutput();
	output.setByteStream(out);
	output.setEncoding("UTF-8");
	// set indent
	DOMConfiguration config = writer.getDomConfig();
	config.setParameter("format-pretty-print", new Boolean(true));
 
	writer.write(xmldoc, output);
 
	out.close();
 
 
}

1. Tutorial : Xml generation with java
2. serializtion of Xml