Create xml Document from File or String & convert Document to String

• Create xml Document from File or String

public Document buildDocumentFromExternalResource() throw Exception {
    String content = "....";
    DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
    docBuilderFactory.setNamespaceAware(true);
    DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
    InputStream inputStream = new ByteArrayInputStream(content.getBytes());
    Document doc = docBuilder.parse(inputStream);
    // read from file
    doc = docBuilder.parse(new File("c:/temp/myContent.xml"));
}

• convert Document to String

public String convertDocumentToString(SOAPBody soapBody) throw Excepiton {
        Document doc = soapBody.getOwnerDocument();
        Source source = new DOMSource(doc);
        StringWriter out = new StringWriter();
        Result result = new StreamResult(out);

        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        transformer.transform(source, result);

        String content = out.toString();
   }

Validate xml use XSD

import javax.xml.transform.stream.StreamSource; 
import javax.xml.validation.SchemaFactory; 
import javax.xml.validation.Schema;
import javax.xml.XMLConstants;
import javax.xml.validation.Validator;

public void validateXml(String xsdFile, String xmlFile) {
   try {
      final String schemaURI = XMLConstants.W3C_XML_SCHEMA_NS_URI; 
      SchemaFactory factory = SchemaFactory.newInstance(schemaURI); 
      Schema schema = factory.newSchema(new StreamSource(xsdFile)); 
      Validator validator = schema.newValidator();
      validator.validate(new StreamSource(xmlFile));
   } catch(Exception e) {
     System.err.println(e);
   }
}