利用Schema验证xml的代码

首先建立handler用来保存验证过程中发现的出错信息

import java.util.ArrayList;

import java.util.List;

import org.xml.sax.ErrorHandler;

import org.xml.sax.SAXException;

import org.xml.sax.SAXParseException;

/**

* @author Haiyan Wang

* @version 1 Oct 26, 2007

*/

public class XmlParserErrorHander implements ErrorHandler {

private List<String>errors;

private int index = 1;

/**

* return errors

*

*/

public List<String> getErrors( ) {

return errors;

}

/**

* @param errors

* the errors to set

*/

public void setErrors(List<String> errors) {

this.errors = errors;

}

/**

*

*/

public XmlParserErrorHander(){

errors = new ArrayList<String>();

}

/* (non-Javadoc)

* @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)

*/

public void error(SAXParseException exception) throws SAXException {

errors.add(exception.getMessage());

}

/* (non-Javadoc)

* @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)

*/

public void fatalError(SAXParseException exception) throws SAXException {

errors.add(exception.getMessage());

}

/* (non-Javadoc)

* @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)

*/

public void warning(SAXParseException exception) throws SAXException {

errors.add(exception.getMessage());

}

public void addError(String error){

errors.add(error);

}

public boolean hasError(){

return (errors != null) && (errors.size() > 0);

}

}

Parse xml的方法-这个方法的作用就是将传入的xml文件解析成Dodument对象，在解析的过程中利用Schema对xml进行验证，如果xml有错，则错误会被保存在Handler中：

/**

* @param schemaContent

* @param xmlContent

* @return

* @throws Exception

*/

public static Document getDocmentNode(String xmlContent, String schemaContent)

throws Exception {

if(logger.isDebugEnabled()){

logger.debug(" Enter getDocmentNode(String xmlContent, String schemaContent)");

}

InputStream is = new ByteArrayInputStream(xmlContent.getBytes());

InputStream schemaIs = new ByteArrayInputStream(schemaContent.getBytes());

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

Document doc = null;

XmlParserErrorHander hander = new XmlParserErrorHander();

try {

SchemaFactory schemaFactory = SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema");

Source schemaSource = new StreamSource(schemaIs);

Schema schema = schemaFactory.newSchema(schemaSource);

javax.xml.validation.Validator validator = schema.newValidator();

Source source = new StreamSource(is);

validator.setErrorHandler(hander);

validator.validate(source);

factory.setIgnoringComments(true);

factory.setIgnoringElementContentWhitespace(true);

// As I tested before, if uses validator, the is would be changed,

// so I have to create a new InputStream.

ByteArrayInputStream is2 =

new ByteArrayInputStream(xmlContent.getBytes());

DocumentBuilder builder = factory.newDocumentBuilder();

doc = builder.parse(is2);

doc.normalize();

} catch (ParserConfigurationException e) {

hander.getErrors().add(e.getMessage());

logger.error(e.getMessage(), e);

} catch (FileNotFoundException e) {

hander.getErrors().add(e.getMessage());

logger.error(e.getMessage(), e);

} catch (SAXException e) {

hander.getErrors().add(e.getMessage());

logger.error(e.getMessage(), e);

} catch (IOException e) {

hander.getErrors().add(e.getMessage());

logger.error(e.getMessage(), e);

}

if (hander.getErrors().size() > 0) {

logger.error("Met " + hander.getErrors().size() + " when parsed the xml.");

StringBuffer buffer =

new StringBuffer("");

for (String error : hander.getErrors()) {

buffer.append(error).append(Constants.ERROR_MESSAGE_SPLIT);

}

buffer.delete(buffer.lastIndexOf(Constants.ERROR_MESSAGE_SPLIT), buffer.length());

logger.error("Error met when get the document from the xml: " + buffer.toString());

throw new Exception(buffer.toString());

}

if(logger.isDebugEnabled()){

logger.debug(" Exit getDocmentNode(String xmlContent, String schemaContent)");

}

return doc;

}

关于xml的验证，可以参阅：

http://blog.csdn.net/haydenwang8287/archive/2007/09/13/1784398.aspx