我需要一些代码示例,该示例说明如何针对架构验证xml文件.下面是我的XML文档:
<birthdate>
<month>January</month>
<day>21</day>
<year>1983</year>
</birthdate>
我要针对其验证上述XML的架构是:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2001/xml.xsd" />
<xs:element name="birthdate">
<xs:complexType>
<xs:sequence>
<xs:element name="month" type="xs:string" />
<xs:element name="day" type="xs:int" />
<xs:element name="year" type="xs:int" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
现在有人可以帮助我编写Java代码,如果XML文档按照我指定的模式有效,则将这些代码作为输入并提供适当的输出?
现在,我在理解以下代码时遇到问题,例如MySAXHandler上的方法如何被调用,因为该类未实例化,并且未显式调用方法.
谁能解释?
而且还有什么方法可以直接传递文件而不是通过字符串传递.
代码是-
import java.io.StringReader;
import javax.xml.XMLConstants;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.sax.SAXSource;
import javax.xml.validation.SchemaFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
public class XMLval {
public static void main(String args[])throws Exception {
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser parser = null;
spf.setNamespaceAware(true);
try {
SchemaFactory sf =
SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
spf.setSchema(sf.newSchema(new SAXSource(new InputSource(new StringReader(schemaString)))));
parser = spf.newSAXParser();
}
catch(SAXException e) {
e.printstacktrace(System.err);
System.exit(1);
}
catch(ParserConfigurationException e) {
e.printstacktrace(System.err);
System.exit(1);
}
MySAXHandler handler = new MySAXHandler();
System.out.println(schemaString);
parser.parse(new InputSource(new StringReader(xmlString)), handler);
}
static String xmlString = "<?xml version=\"1.0\"?>" +
"<birthdate>" +
"<month>January</month>" +
"<day>21</day>" +
"<year>1983</year>" +
"</birthdate>";
static String schemaString ="<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
"<xs:element name=\"birthdate\">" +
"<xs:complexType>" +
"<xs:sequence>" +
"<xs:element name=\"month\" type=\"xs:string\"/>" +
"<xs:element name=\"day\" type=\"xs:int\"/>" +
"<xs:element name=\"year\" type=\"xs:int\" />" +
"</xs:sequence>" +
"</xs:complexType>" +
"</xs:element>" +
"</xs:schema>";
}
class MySAXHandler extends DefaultHandler {
public void startDocument() {
System.out.println("Start document: ");
}
public void endDocument() {
System.out.println("End document: ");
}
public void startElement(String uri, String localName, String qname,
Attributes attr)
{
System.out.println("Start element: local name: " + localName + " qname: "
+ qname + " uri: "+uri);
int attrCount = attr.getLength();
if(attrCount>0) {
System.out.println("Attributes:");
for(int i = 0 ; i<attrCount ; i++) {
System.out.println(" Name : " + attr.getQName(i));
System.out.println(" Type : " + attr.getType(i));
System.out.println(" Value: " + attr.getValue(i));
}
}
}
public void endElement(String uri, String localName, String qname) {
System.out.println("End element: local name: " + localName + " qname: "
+ qname + " uri: "+uri);
}
public void characters(char[] ch, int start, int length) {
System.out.println("Characters: " + new String(ch, start, length));
}
}
解决方法:
您可以尝试JDOM库.
http://www.jdom.org/docs/faq.html#a0360
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