Come convalidare un file XML utilizzando Java con un XSD con un inclusivo?

Sto usando Java 5 javax.xml.validation.Validator per convalidare il file XML. L’ho fatto per uno schema che utilizza solo le importazioni e tutto funziona correttamente. Ora sto provando a convalidare con un altro schema che usa import e un include. Il problema che ho è che l’elemento nello schema principale viene ignorato, la convalida dice che non riesce a trovare la loro dichiarazione.

Ecco come costruisco lo schema:

InputStream includeInputStream = getClass().getClassLoader().getResource("include.xsd").openStream(); InputStream importInputStream = getClass().getClassLoader().getResource("import.xsd").openStream(); InputStream mainInputStream = getClass().getClassLoader().getResource("main.xsd").openStream(); Source[] sourceSchema = new SAXSource[]{includeInputStream , importInputStream, mainInputStream }; Schema schema = factory.newSchema(sourceSchema); 

Ora ecco l’estratto della dichiarazione in main.xsd

       

Se copio il codice del mio XSD incluso nel file main.xsd, funziona correttamente. Se non lo faccio, la convalida non trova la dichiarazione di “Elemento”.

è necessario utilizzare un LSResourceResolver per fare in modo che funzioni. si prega di dare un’occhiata al codice di esempio qui sotto.

un metodo di validazione:

 // note that if your XML already declares the XSD to which it has to conform, then there's no need to declare the schemaName here void validate(String xml, String schemaName) throws Exception { DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance(); builderFactory.setNamespaceAware(true); DocumentBuilder parser = builderFactory .newDocumentBuilder(); // parse the XML into a document object Document document = parser.parse(new StringInputStream(xml)); SchemaFactory factory = SchemaFactory .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); // associate the schema factory with the resource resolver, which is responsible for resolving the imported XSD's factory.setResourceResolver(new ResourceResolver()); // note that if your XML already declares the XSD to which it has to conform, then there's no need to create a validator from a Schema object Source schemaFile = new StreamSource(getClass().getClassLoader() .getResourceAsStream(schemaName)); Schema schema = factory.newSchema(schemaFile); Validator validator = schema.newValidator(); validator.validate(new DOMSource(document)); } 

l’implementazione del risolutore risorse:

 public class ResourceResolver implements LSResourceResolver { public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) { // note: in this sample, the XSD's are expected to be in the root of the classpath InputStream resourceAsStream = this.getClass().getClassLoader() .getResourceAsStream(systemId); return new Input(publicId, systemId, resourceAsStream); } } 

L’implementazione di input restituita dal resource resolver:

 public class Input implements LSInput { private String publicId; private String systemId; public String getPublicId() { return publicId; } public void setPublicId(String publicId) { this.publicId = publicId; } public String getBaseURI() { return null; } public InputStream getByteStream() { return null; } public boolean getCertifiedText() { return false; } public Reader getCharacterStream() { return null; } public String getEncoding() { return null; } public String getStringData() { synchronized (inputStream) { try { byte[] input = new byte[inputStream.available()]; inputStream.read(input); String contents = new String(input); return contents; } catch (IOException e) { e.printStackTrace(); System.out.println("Exception " + e); return null; } } } public void setBaseURI(String baseURI) { } public void setByteStream(InputStream byteStream) { } public void setCertifiedText(boolean certifiedText) { } public void setCharacterStream(Reader characterStream) { } public void setEncoding(String encoding) { } public void setStringData(String stringData) { } public String getSystemId() { return systemId; } public void setSystemId(String systemId) { this.systemId = systemId; } public BufferedInputStream getInputStream() { return inputStream; } public void setInputStream(BufferedInputStream inputStream) { this.inputStream = inputStream; } private BufferedInputStream inputStream; public Input(String publicId, String sysId, InputStream input) { this.publicId = publicId; this.systemId = sysId; this.inputStream = new BufferedInputStream(input); } } 

Ho dovuto apportare alcune modifiche a questo post di AMegmondoEmber

Il mio file di schema principale aveva alcune inclusioni da cartelle di pari livello e anche i file inclusi contenevano alcuni include dalle loro cartelle locali. Ho anche dovuto rintracciare il percorso delle risorse di base e il percorso relativo della risorsa corrente. Questo codice funziona per me, ma tieni presente che presuppone che tutti i file xsd abbiano un nome univoco. Se hai alcuni file xsd con lo stesso nome, ma contenuti diversi su percorsi diversi, probabilmente ti darà problemi.

 import java.io.ByteArrayInputStream; import java.io.InputStream; import java.util.HashMap; import java.util.Map; import java.util.Scanner; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.w3c.dom.ls.LSInput; import org.w3c.dom.ls.LSResourceResolver; /** * The Class ResourceResolver. */ public class ResourceResolver implements LSResourceResolver { /** The logger. */ private final Logger logger = LoggerFactory.getLogger(this.getClass()); /** The schema base path. */ private final String schemaBasePath; /** The path map. */ private Map pathMap = new HashMap(); /** * Instantiates a new resource resolver. * * @param schemaBasePath the schema base path */ public ResourceResolver(String schemaBasePath) { this.schemaBasePath = schemaBasePath; logger.warn("This LSResourceResolver implementation assumes that all XSD files have a unique name. " + "If you have some XSD files with same name but different content (at different paths) in your schema structure, " + "this resolver will fail to include the other XSD files except the first one found."); } /* (non-Javadoc) * @see org.w3c.dom.ls.LSResourceResolver#resolveResource(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String) */ @Override public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) { // The base resource that includes this current resource String baseResourceName = null; String baseResourcePath = null; // Extract the current resource name String currentResourceName = systemId.substring(systemId .lastIndexOf("/") + 1); // If this resource hasn't been added yet if (!pathMap.containsKey(currentResourceName)) { if (baseURI != null) { baseResourceName = baseURI .substring(baseURI.lastIndexOf("/") + 1); } // we dont need "./" since getResourceAsStream cannot understand it if (systemId.startsWith("./")) { systemId = systemId.substring(2, systemId.length()); } // If the baseResourcePath has already been discovered, get that // from pathMap if (pathMap.containsKey(baseResourceName)) { baseResourcePath = pathMap.get(baseResourceName); } else { // The baseResourcePath should be the schemaBasePath baseResourcePath = schemaBasePath; } // Read the resource as input stream String normalizedPath = getNormalizedPath(baseResourcePath, systemId); InputStream resourceAsStream = this.getClass().getClassLoader() .getResourceAsStream(normalizedPath); // if the current resource is not in the same path with base // resource, add current resource's path to pathMap if (systemId.contains("/")) { pathMap.put(currentResourceName, normalizedPath.substring(0,normalizedPath.lastIndexOf("/")+1)); } else { // The current resource should be at the same path as the base // resource pathMap.put(systemId, baseResourcePath); } Scanner s = new Scanner(resourceAsStream).useDelimiter("\\A"); String s1 = s.next().replaceAll("\\n", " ") // the parser cannot understand elements broken down multiple lines eg () .replace("\\t", " ") // these two about whitespaces is only for decoration .replaceAll("\\s+", " ").replaceAll("[^\\x20-\\x7e]", ""); // some files has a special character as a first character indicating utf-8 file InputStream is = new ByteArrayInputStream(s1.getBytes()); return new LSInputImpl(publicId, systemId, is); // same as Input class } // If this resource has already been added, do not add the same resource again. It throws // "org.xml.sax.SAXParseException: sch-props-correct.2: A schema cannot contain two global components with the same name; this schema contains two occurrences of ..." // return null instead. return null; } /** * Gets the normalized path. * * @param basePath the base path * @param relativePath the relative path * @return the normalized path */ private String getNormalizedPath(String basePath, String relativePath){ if(!relativePath.startsWith("../")){ return basePath + relativePath; } else{ while(relativePath.startsWith("../")){ basePath = basePath.substring(0,basePath.substring(0, basePath.length()-1).lastIndexOf("/")+1); relativePath = relativePath.substring(3); } return basePath+relativePath; } } } 

La risposta accettata è perfettamente a posto, ma non funziona con Java 8 senza alcune modifiche. Sarebbe anche bello poter specificare un percorso di base da cui leggere gli schemi importati.

Ho usato nel mio Java 8 il seguente codice che consente di specificare un percorso dello schema incorporato diverso dal percorso root:

 import com.sun.org.apache.xerces.internal.dom.DOMInputImpl; import org.w3c.dom.ls.LSInput; import org.w3c.dom.ls.LSResourceResolver; import java.io.InputStream; import java.util.Objects; public class ResourceResolver implements LSResourceResolver { private String basePath; public ResourceResolver(String basePath) { this.basePath = basePath; } @Override public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) { // note: in this sample, the XSD's are expected to be in the root of the classpath InputStream resourceAsStream = this.getClass().getClassLoader() .getResourceAsStream(buildPath(systemId)); Objects.requireNonNull(resourceAsStream, String.format("Could not find the specified xsd file: %s", systemId)); return new DOMInputImpl(publicId, systemId, baseURI, resourceAsStream, "UTF-8"); } private String buildPath(String systemId) { return basePath == null ? systemId : String.format("%s/%s", basePath, systemId); } } 

Questa implementazione dà anche all’utente un messaggio significativo nel caso in cui lo schema non possa essere letto.

Per noi il resolveResource sembrava così. Dopo alcune eccezioni prolog e il tipo di elemento strano “xs: schema” devono essere seguite dalle specifiche degli attributi, “>” o “/>”. Il tipo di elemento “xs: element” deve essere seguito dalle specifiche degli attributi, “>” o “/>”. (a causa della rottura di più linee)

La cronologia del percorso era necessaria a causa della struttura degli include

 main.xsd (this has include "includes/subPart.xsd") /includes/subPart.xsd (this has include "./subSubPart.xsd") /includes/subSubPart.xsd 

Quindi il codice sembra:

 String pathHistory = ""; @Override public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) { systemId = systemId.replace("./", "");// we dont need this since getResourceAsStream cannot understand it InputStream resourceAsStream = Message.class.getClassLoader().getResourceAsStream(systemId); if (resourceAsStream == null) { resourceAsStream = Message.class.getClassLoader().getResourceAsStream(pathHistory + systemId); } else { pathHistory = getNormalizedPath(systemId); } Scanner s = new Scanner(resourceAsStream).useDelimiter("\\A"); String s1 = s.next() .replaceAll("\\n"," ") //the parser cannot understand elements broken down multiple lines eg () .replace("\\t", " ") //these two about whitespaces is only for decoration .replaceAll("\\s+", " ") .replaceAll("[^\\x20-\\x7e]", ""); //some files has a special character as a first character indicating utf-8 file InputStream is = new ByteArrayInputStream(s1.getBytes()); return new LSInputImpl(publicId, systemId, is); } private String getNormalizedPath(String baseURI) { return baseURI.substring(0, baseURI.lastIndexOf(System.getProperty("file.separator"))+ 1) ; } 

Se non trovi un elemento in xml riceverai xml: lang exception. Gli elementi sono case sensitive

La risposta accettata è molto prolissa e costruisce un DOM in memoria prima, include sembra funzionare fuori dagli schemi per me, inclusi i riferimenti relativi.

  SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); Schema schema = schemaFactory.newSchema(new File("../foo.xsd")); Validator validator = schema.newValidator(); validator.validate(new StreamSource(new File("./foo.xml"))); 
 SchemaFactory schemaFactory = SchemaFactory .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); Source schemaFile = new StreamSource(getClass().getClassLoader() .getResourceAsStream("cars-fleet.xsd")); Schema schema = schemaFactory.newSchema(schemaFile); Validator validator = schema.newValidator(); StreamSource source = new StreamSource(xml); validator.validate(source);