SAX&DOM

order.dtd

<!ELEMENT orderlist (order+)>
<!ELEMENT order (address, receiper,date?,item+)>
<!ATTLIST order orderid ID #REQUIRED>
<!ELEMENT address (zipcode, province, city, street)>
<!ELEMENT receiper (firstname, lastame)>
<!ELEMENT date (#PCDATA)>
<!ELEMENT item (gid,gname,price,count)>
<!ELEMENT zipcode (#PCDATA)>
<!ELEMENT province (#PCDATA)>
<!ELEMENT city (#PCDATA)>
<!ELEMENT street (#PCDATA)>
<!ELEMENT firstname (#PCDATA)>
<!ELEMENT lastame (#PCDATA)>
<!ELEMENT gid (#PCDATA)>
<!ELEMENT gname (#PCDATA)>
<!ELEMENT price (#PCDATA)>
<!ELEMENT count (#PCDATA)>
-------------------------------------

order.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE order SYSTEM "order.dtd">
<orderlist>
<order orderid="order001">
<address>
<zipcode>001</zipcode>
<province>shanghai</province>
<city>shanghai</city>
<street>zhejiang</street>
</address>

<receiper>
<firstname>Json</firstname>
<lastame>Simth</lastame>
</receiper>

<item>
<gid>001</gid>
<gname>Dom</gname>
<price>$200</price>
<count>3</count>
</item>

</order>
</orderlist>

-----------------------------------
SAX解析器
public static void main(String[] args)

//定义工厂 API，使应用程序能够配置和获取基于 SAX 的解析器以解析 XML 文档。
SAXParserFactory fac = SAXParserFactory.newInstance();
SAXParser parser = fac.newSAXParser();
parser.parse("src/order.xml", new myHandler());

-----------------------------------

class myHandler extends DefaultHandler {

@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
StringBuffer sb = new StringBuffer();
sb.append("<" + qName );
for (int i = 0; i <attributes.getLength() ; i++) {
sb.append(" "+attributes.getQName(i) + "='");
sb.append(attributes.getValue(i)+ "'");
}
sb.append(">");
System.out.print(sb.toString());
}



@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
String str = new String(ch,start,length);
System.out.print(str.toString());
}



@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
System.out.println("</" + qName + ">");
}



@Override
public void endDocument() throws SAXException {
System.out.println("just over------------------------------");
}

@Override
public void startDocument() throws SAXException {
System.out.println("just start------------------------------");
}

}
*****************************************

DOM解析器

public static void main(String[] args)


DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = dbf.newDocumentBuilder();
Document doc = builder.parse("src/order.xml");
Element root = doc.getDocumentElement();
String str = walkTree(root);
System.out.println(str);

-----------------------------------------

public static String walkTree(Element tree)
{
StringBuffer sb = new StringBuffer();
sb.append("<" + tree.getNodeName());
NamedNodeMap attrs = tree.getAttributes();

for (int i = 0; i < attrs.getLength(); i++) {
Node item = attrs.item(i);
sb.append(" "+item.getNodeName() + "=");
sb .append(item.getNodeValue());
}
sb.append(">");

NodeList children = tree.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
Node child = children.item(i);
//该节点为 Entity。
if(child.getNodeType() == Node.ELEMENT_NODE)
{
sb.append(walkTree((Element)child));
}else
{
sb.append(child.getTextContent());
}

}
sb.append("</"+tree.getNodeName()+">");

return sb.toString();
}