下面列出了怎么用javax.xml.stream.XMLStreamConstants的API类实例代码及写法，或者点击链接到github查看源代码。
@Override
public final XMLEvent nextTag() throws XMLStreamException {
XMLEvent event = this.nextEvent();
while ((event.isCharacters() && event.asCharacters().isWhiteSpace())
|| event.isProcessingInstruction()
|| event.getEventType() == XMLStreamConstants.COMMENT) {
event = this.nextEvent();
}
if (!event.isStartElement() && event.isEndElement()) {
throw new XMLStreamException("Unexpected event type '" + XMLStreamConstantsUtils.getEventName(event.getEventType()) + "' encountered. Found event: " + event, event.getLocation());
}
return event;
}
private static void readProps(XMLExtendedStreamReader reader, ConfigModel.Builder builder) throws XMLStreamException {
ParsingUtils.parseNoAttributes(reader);
while (reader.hasNext()) {
switch (reader.nextTag()) {
case XMLStreamConstants.END_ELEMENT: {
return;
}
case XMLStreamConstants.START_ELEMENT: {
final Element element = Element.of(reader.getName().getLocalPart());
switch (element) {
case PROP:
readProp(reader, builder);
break;
default:
throw ParsingUtils.unexpectedContent(reader);
}
break;
}
default: {
throw ParsingUtils.unexpectedContent(reader);
}
}
}
throw ParsingUtils.endOfDocument(reader.getLocation());
}
private static void readTransitive(XMLExtendedStreamReader reader, FeaturePackDepsConfigBuilder<?> builder) throws XMLStreamException {
ParsingUtils.parseNoAttributes(reader);
while (reader.hasNext()) {
switch (reader.nextTag()) {
case XMLStreamConstants.END_ELEMENT: {
return;
}
case XMLStreamConstants.START_ELEMENT: {
final Element element = Element.of(reader.getLocalName());
switch (element) {
case DEPENDENCY:
ProvisioningXmlParser30.readTransitiveFeaturePackDep(reader, builder);
break;
default:
throw ParsingUtils.unexpectedContent(reader);
}
break;
}
default: {
throw ParsingUtils.unexpectedContent(reader);
}
}
}
throw ParsingUtils.endOfDocument(reader.getLocation());
}
@Test
public void testReadingNamespace() {
is = new java.io.ByteArrayInputStream(getXML().getBytes());
try {
XMLStreamReader sr = factory.createFilteredReader(factory.createXMLStreamReader(is), (StreamFilter) filter);
while (sr.hasNext()) {
int eventType = sr.getEventType();
if (eventType == XMLStreamConstants.START_ELEMENT) {
if (sr.getLocalName().equals(rootElement)) {
Assert.assertTrue(sr.getNamespacePrefix(0).equals(prefixApple) && sr.getNamespaceURI(0).equals(namespaceURIApple));
}
}
eventType = sr.next();
}
} catch (Exception ex) {
Assert.fail("Exception: " + ex.getMessage());
}
}
List<Integer> readSyntaxPositions(XMLStreamReader reader) {
final List<Integer> positions = new ArrayList<>(5);
boolean endOfSyntax = false;
while (!endOfSyntax) {
final int event = nextTag(reader, "reading syntax positions");
final QName element = reader.getName();
if (event == XMLStreamConstants.START_ELEMENT) {
if (element.equals(qnPosition)) {
final String position = getElementText(reader, "syntax position");
try {
positions.add(Integer.parseInt(position));
} catch (@SuppressWarnings("unused") NumberFormatException e) {
throw schemaException("invalid position [" + position + ']', reader);
}
}
} else {
endOfSyntax = true;
}
}
return positions;
}
/**
* Returns the accumulated text of an event type.
*
* @param streamReader the XMLStreamReader
* @param type the type of event requested
* @return the text of the accumulated text for the request type
* @throws XMLStreamException
*/
String getText(XMLStreamReader streamReader, int type) throws XMLStreamException {
StringBuilder text = new StringBuilder();
StringBuilder entityRef = new StringBuilder();
while(streamReader.hasNext()){
int eventType = streamReader.next();
switch (eventType) {
case XMLStreamConstants.START_ELEMENT:
break;
case XMLStreamConstants.CHARACTERS:
text.append(streamReader.getText());
break;
case XMLStreamConstants.ENTITY_REFERENCE:
entityRef.append(streamReader.getText());
break;
}
}
if (type == XMLStreamConstants.CHARACTERS) {
return text.toString();
} else {
return entityRef.toString();
}
}
public IApackManifest deserializeApackManifest(XMLStreamReader xmlReader) throws XMLStreamException {
ApackManifest apackManifest = new ApackManifest();
while (xmlReader.hasNext()) {
int next = xmlReader.next();
switch (next) {
case XMLStreamConstants.START_ELEMENT:
switch (xmlReader.getLocalName()) {
case "descriptor": //$NON-NLS-1$
apackManifest.setDescriptor(deserializeDescriptor(xmlReader));
break;
default:
break;
}
break;
default:
break;
}
}
return apackManifest;
}
/**
* CR 6631264 / sjsxp Issue 45:
* https://sjsxp.dev.java.net/issues/show_bug.cgi?id=45
* XMLStreamReader.hasName() should return false for ENTITY_REFERENCE
*/
@Test
public void testHasNameOnEntityEvent() throws Exception {
XMLInputFactory xif = XMLInputFactory.newInstance();
xif.setProperty(XMLInputFactory.IS_REPLACING_ENTITY_REFERENCES, false);
XMLStreamReader r = xif.createXMLStreamReader(
this.getClass().getResourceAsStream("ExternalDTD.xml"));
while (r.next() != XMLStreamConstants.ENTITY_REFERENCE) {
System.out.println("event type: " + r.getEventType());
continue;
}
if (r.hasName()) {
System.out.println("hasName returned true on ENTITY_REFERENCE event.");
}
Assert.assertFalse(r.hasName()); // fails
}
@Test
public void testPITargetAndData() {
try {
XMLInputFactory xif = XMLInputFactory.newInstance();
String PITarget = "soffice";
String PIData = "WebservicesArchitecture";
String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + "<?" + PITarget + " " + PIData + "?>" + "<foo></foo>";
// System.out.println("XML = " + xml) ;
InputStream is = new java.io.ByteArrayInputStream(xml.getBytes());
XMLStreamReader sr = xif.createXMLStreamReader(is);
while (sr.hasNext()) {
int eventType = sr.next();
if (eventType == XMLStreamConstants.PROCESSING_INSTRUCTION) {
String target = sr.getPITarget();
String data = sr.getPIData();
Assert.assertTrue(target.equals(PITarget) && data.equals(PIData));
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* Creates a new {@link javax.xml.transform.Source} for the given
* {@link XMLStreamReader}.
*
* The XMLStreamReader must be pointing at either a
* {@link javax.xml.stream.XMLStreamConstants#START_DOCUMENT} or
* {@link javax.xml.stream.XMLStreamConstants#START_ELEMENT} event.
*
* @param reader XMLStreamReader that will be exposed as a Source
* @param eagerQuit if true, when the conversion is completed, leave the cursor to the last
* event that was fired (such as end element)
* @param inscope inscope Namespaces
* array of the even length of the form { prefix0, uri0, prefix1, uri1, ... }
* @throws IllegalArgumentException iff the reader is null
* @throws IllegalStateException iff the reader is not pointing at either a
* START_DOCUMENT or START_ELEMENT event
*/
public StAXSource(XMLStreamReader reader, boolean eagerQuit, @NotNull String[] inscope) {
if( reader == null )
throw new IllegalArgumentException();
this.staxReader = reader;
int eventType = reader.getEventType();
if (!(eventType == XMLStreamConstants.START_DOCUMENT)
&& !(eventType == XMLStreamConstants.START_ELEMENT)) {
throw new IllegalStateException();
}
this.reader = new XMLStreamReaderToContentHandler(reader,repeater,eagerQuit,false,inscope);
super.setXMLReader(pseudoParser);
// pass a dummy InputSource. We don't care
super.setInputSource(new InputSource());
}
private void readFrequencies(XMLExtendedStreamReader reader, MavenParsedProducerCallbackHandler builder) throws XMLStreamException {
ParsingUtils.parseNoAttributes(reader);
while (reader.hasNext()) {
switch (reader.nextTag()) {
case XMLStreamConstants.END_ELEMENT: {
return;
}
case XMLStreamConstants.START_ELEMENT: {
final Element element = Element.of(reader.getName());
switch (element) {
case FREQUENCY:
readFrequency(reader, builder);
break;
default:
throw ParsingUtils.unexpectedContent(reader);
}
break;
}
default: {
throw ParsingUtils.unexpectedContent(reader);
}
}
}
throw ParsingUtils.endOfDocument(reader.getLocation());
}
protected List<NotationDeclaration> getNotationDecls() {
if (fEventType == XMLStreamConstants.DTD) {
if (fScanner.fDTDScanner == null) {
return null;
}
DTDGrammar grammar = ((XMLDTDScannerImpl) (fScanner.fDTDScanner)).getGrammar();
if (grammar == null) {
return null;
}
List<XMLNotationDecl> notations = grammar.getNotationDecls();
ArrayList<NotationDeclaration> list = new ArrayList<>();
for (XMLNotationDecl notation : notations) {
if (notation != null) {
list.add(new NotationDeclarationImpl(notation));
}
}
return list;
}
return null;
}
/**
* Skips any insignificant events (COMMENT and PROCESSING_INSTRUCTION) until
* a START_ELEMENT or END_ELEMENT is reached. If other than space characters
* are encountered, an exception is thrown. This method should be used when
* processing element-only content because the parser is not able to
* recognize ignorable whitespace if then DTD is missing or not interpreted.
*
* @return the event type of the element read
* @throws XMLStreamException if the current event is not white space
*/
public int nextTag() throws XMLStreamException {
int eventType = next();
while ((eventType == XMLStreamConstants.CHARACTERS && isWhiteSpace()) // skip whitespace
|| (eventType == XMLStreamConstants.CDATA && isWhiteSpace())
// skip whitespace
|| eventType == XMLStreamConstants.SPACE
|| eventType == XMLStreamConstants.PROCESSING_INSTRUCTION
|| eventType == XMLStreamConstants.COMMENT) {
eventType = next();
}
if (eventType != XMLStreamConstants.START_ELEMENT && eventType != XMLStreamConstants.END_ELEMENT) {
throw new XMLStreamException(
"found: " + getEventTypeString(eventType)
+ ", expected " + getEventTypeString(XMLStreamConstants.START_ELEMENT)
+ " or " + getEventTypeString(XMLStreamConstants.END_ELEMENT),
getLocation());
}
return eventType;
}
protected List getNotationDecls(){
if(fEventType == XMLStreamConstants.DTD){
if(fScanner.fDTDScanner == null) return null;
DTDGrammar grammar = ((XMLDTDScannerImpl)(fScanner.fDTDScanner)).getGrammar();
if(grammar == null) return null;
List notations = grammar.getNotationDecls();
Iterator it = notations.iterator();
ArrayList list = new ArrayList();
while(it.hasNext()){
XMLNotationDecl ni = (XMLNotationDecl)it.next();
if(ni!= null){
list.add(new NotationDeclarationImpl(ni));
}
}
return list;
}
return null;
}
/** Skips any insignificant events (COMMENT and PROCESSING_INSTRUCTION)
* until a START_ELEMENT or
* END_ELEMENT is reached. If other than space characters are
* encountered, an exception is thrown. This method should
* be used when processing element-only content because
* the parser is not able to recognize ignorable whitespace if
* then DTD is missing or not interpreted.
* @return the event type of the element read
* @throws XMLStreamException if the current event is not white space
*/
public int nextTag() throws XMLStreamException {
int eventType = next();
while((eventType == XMLStreamConstants.CHARACTERS && isWhiteSpace()) // skip whitespace
|| (eventType == XMLStreamConstants.CDATA && isWhiteSpace())
// skip whitespace
|| eventType == XMLStreamConstants.SPACE
|| eventType == XMLStreamConstants.PROCESSING_INSTRUCTION
|| eventType == XMLStreamConstants.COMMENT
) {
eventType = next();
}
if (eventType != XMLStreamConstants.START_ELEMENT && eventType != XMLStreamConstants.END_ELEMENT) {
throw new XMLStreamException(
"found: " + getEventTypeString(eventType)
+ ", expected " + getEventTypeString(XMLStreamConstants.START_ELEMENT)
+ " or " + getEventTypeString(XMLStreamConstants.END_ELEMENT),
getLocation());
}
return eventType;
}
private static void parsePlugins(XMLExtendedStreamReader reader, FeaturePackSpec.Builder fpBuilder) throws XMLStreamException {
ParsingUtils.parseNoAttributes(reader);
while (reader.hasNext()) {
switch (reader.nextTag()) {
case XMLStreamConstants.END_ELEMENT: {
return;
}
case XMLStreamConstants.START_ELEMENT: {
final Element element = Element.of(reader.getName().getLocalPart());
switch (element) {
case PLUGIN:
parsePlugin(reader, fpBuilder);
break;
default:
throw ParsingUtils.unexpectedContent(reader);
}
break;
}
default: {
throw ParsingUtils.unexpectedContent(reader);
}
}
}
throw ParsingUtils.endOfDocument(reader.getLocation());
}
@Test
public void testRootElementNamespace() {
try {
XMLInputFactory xif = XMLInputFactory.newInstance();
xif.setProperty(XMLInputFactory.IS_NAMESPACE_AWARE, Boolean.TRUE);
InputStream is = new java.io.ByteArrayInputStream(getXML().getBytes());
XMLStreamReader sr = xif.createXMLStreamReader(is);
while (sr.hasNext()) {
int eventType = sr.next();
if (eventType == XMLStreamConstants.START_ELEMENT) {
if (sr.getLocalName().equals(rootElement)) {
Assert.assertTrue(sr.getNamespacePrefix(0).equals(prefix) && sr.getNamespaceURI(0).equals(namespaceURI));
}
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
@Test
public void testNamespaceContext() {
is = new java.io.ByteArrayInputStream(getXML().getBytes());
try {
XMLStreamReader sr = factory.createFilteredReader(factory.createXMLStreamReader(is), (StreamFilter) filter);
while (sr.hasNext()) {
int eventType = sr.next();
if (eventType == XMLStreamConstants.START_ELEMENT) {
if (sr.getLocalName().equals(childElement)) {
NamespaceContext context = sr.getNamespaceContext();
Assert.assertTrue(context.getPrefix(namespaceURIApple).equals(prefixApple));
}
}
}
} catch (Exception ex) {
Assert.fail("Exception: " + ex.getMessage());
}
}
@Override
public String getElementText() throws XMLStreamException {
if (getEventType() != XMLStreamConstants.START_ELEMENT) {
throw new XMLStreamException("Parser must be on START_ELEMENT to read next text", getLocation());
}
int eventType = next();
StringBuilder builder = new StringBuilder();
while (eventType != XMLStreamConstants.END_ELEMENT) {
if (eventType == XMLStreamConstants.CHARACTERS || eventType == XMLStreamConstants.CDATA ||
eventType == XMLStreamConstants.SPACE || eventType == XMLStreamConstants.ENTITY_REFERENCE) {
builder.append(getText());
}
else if (eventType == XMLStreamConstants.PROCESSING_INSTRUCTION ||
eventType == XMLStreamConstants.COMMENT) {
// skipping
}
else if (eventType == XMLStreamConstants.END_DOCUMENT) {
throw new XMLStreamException("Unexpected end of document when reading element text content",
getLocation());
}
else if (eventType == XMLStreamConstants.START_ELEMENT) {
throw new XMLStreamException("Element text content may not contain START_ELEMENT", getLocation());
}
else {
throw new XMLStreamException("Unexpected event type " + eventType, getLocation());
}
eventType = next();
}
return builder.toString();
}
/**
* Returns true if the cursor points to a character data event that consists of all whitespace
* Application calling this method needs to cache the value and avoid calling this method again
* for the same event.
* @return
*/
public boolean isWhiteSpace() {
if(isCharacters() || (fEventType == XMLStreamConstants.CDATA)){
char [] ch = this.getTextCharacters();
final int start = this.getTextStart();
final int end = start + this.getTextLength();
for (int i = start; i < end; i++){
if(!XMLChar.isSpace(ch[i])){
return false;
}
}
return true;
}
return false;
}
@Override
public boolean hasText() {
int eventType = getEventType();
return (eventType == XMLStreamConstants.SPACE || eventType == XMLStreamConstants.CHARACTERS ||
eventType == XMLStreamConstants.COMMENT || eventType == XMLStreamConstants.CDATA ||
eventType == XMLStreamConstants.ENTITY_REFERENCE);
}
@Override
public int nextTag() throws XMLStreamException {
int eventType = next();
while (eventType == XMLStreamConstants.CHARACTERS && isWhiteSpace() ||
eventType == XMLStreamConstants.CDATA && isWhiteSpace() || eventType == XMLStreamConstants.SPACE ||
eventType == XMLStreamConstants.PROCESSING_INSTRUCTION || eventType == XMLStreamConstants.COMMENT) {
eventType = next();
}
if (eventType != XMLStreamConstants.START_ELEMENT && eventType != XMLStreamConstants.END_ELEMENT) {
throw new XMLStreamException("expected start or end tag", getLocation());
}
return eventType;
}
/**
* Get the human readable event name for the numeric event id
*/
public static String getEventName(int eventId) {
switch (eventId) {
case XMLStreamConstants.START_ELEMENT:
return "StartElementEvent";
case XMLStreamConstants.END_ELEMENT:
return "EndElementEvent";
case XMLStreamConstants.PROCESSING_INSTRUCTION:
return "ProcessingInstructionEvent";
case XMLStreamConstants.CHARACTERS:
return "CharacterEvent";
case XMLStreamConstants.COMMENT:
return "CommentEvent";
case XMLStreamConstants.START_DOCUMENT:
return "StartDocumentEvent";
case XMLStreamConstants.END_DOCUMENT:
return "EndDocumentEvent";
case XMLStreamConstants.ENTITY_REFERENCE:
return "EntityReferenceEvent";
case XMLStreamConstants.ATTRIBUTE:
return "AttributeBase";
case XMLStreamConstants.DTD:
return "DTDEvent";
case XMLStreamConstants.CDATA:
return "CDATA";
}
return "UNKNOWN_EVENT_TYPE";
}
@Override
public int nextTag() throws XMLStreamException {
int eventType = next();
while (eventType == XMLStreamConstants.CHARACTERS && isWhiteSpace() ||
eventType == XMLStreamConstants.CDATA && isWhiteSpace() || eventType == XMLStreamConstants.SPACE ||
eventType == XMLStreamConstants.PROCESSING_INSTRUCTION || eventType == XMLStreamConstants.COMMENT) {
eventType = next();
}
if (eventType != XMLStreamConstants.START_ELEMENT && eventType != XMLStreamConstants.END_ELEMENT) {
throw new XMLStreamException("expected start or end tag", getLocation());
}
return eventType;
}
/**
* Returns true if the cursor points to a character data event that consists of all whitespace
* Application calling this method needs to cache the value and avoid calling this method again
* for the same event.
* @return
*/
public boolean isWhiteSpace() {
if(isCharacters() || (fEventType == XMLStreamConstants.CDATA)){
char [] ch = this.getTextCharacters();
final int start = this.getTextStart();
final int end = start + this.getTextLength();
for (int i = start; i < end; i++){
if(!XMLChar.isSpace(ch[i])){
return false;
}
}
return true;
}
return false;
}
/**
* <p>Creates a new instance of a <code>StAXSource</code>
* by supplying an {@link XMLEventReader}.</p>
*
* <p><code>XMLEventReader</code> must be a
* non-<code>null</code> reference.</p>
*
* <p><code>XMLEventReader</code> must be in
* {@link XMLStreamConstants#START_DOCUMENT} or
* {@link XMLStreamConstants#START_ELEMENT} state.</p>
*
* @param xmlEventReader <code>XMLEventReader</code> used to create
* this <code>StAXSource</code>.
*
* @throws XMLStreamException If <code>xmlEventReader</code> access
* throws an <code>Exception</code>.
* @throws IllegalArgumentException If <code>xmlEventReader</code> ==
* <code>null</code>.
* @throws IllegalStateException If <code>xmlEventReader</code>
* is not in <code>XMLStreamConstants.START_DOCUMENT</code> or
* <code>XMLStreamConstants.START_ELEMENT</code> state.
*/
public StAXSource(final XMLEventReader xmlEventReader)
throws XMLStreamException {
if (xmlEventReader == null) {
throw new IllegalArgumentException(
"StAXSource(XMLEventReader) with XMLEventReader == null");
}
// TODO: This is ugly ...
// there is no way to know the current position(event) of
// XMLEventReader. peek() is the only way to know the next event.
// The next event on the input stream should be
// XMLStreamConstants.START_DOCUMENT or
// XMLStreamConstants.START_ELEMENT.
XMLEvent event = xmlEventReader.peek();
int eventType = event.getEventType();
if (eventType != XMLStreamConstants.START_DOCUMENT
&& eventType != XMLStreamConstants.START_ELEMENT) {
throw new IllegalStateException(
"StAXSource(XMLEventReader) with XMLEventReader "
+ "not in XMLStreamConstants.START_DOCUMENT or "
+ "XMLStreamConstants.START_ELEMENT state");
}
this.xmlEventReader = xmlEventReader;
systemId = event.getLocation().getSystemId();
}
@Override
public String getPayloadAttributeValue(QName attName) {
if (lazySource.isPayloadStreamReader()) {
XMLStreamReader reader = lazySource.readPayload();
if (reader.getEventType() == XMLStreamConstants.START_ELEMENT) {
return reader.getAttributeValue(attName.getNamespaceURI(), attName.getLocalPart());
}
}
return null;
}
public static String readUntilEndElementWithDepth(String endElementName, XMLStreamReader reader, XmlEventHandlerWithDepth eventHandler) throws XMLStreamException {
Objects.requireNonNull(endElementName);
Objects.requireNonNull(reader);
String text = null;
int event;
int depth = 0;
while (!((event = reader.next()) == XMLStreamConstants.END_ELEMENT
&& reader.getLocalName().equals(endElementName))) {
text = null;
switch (event) {
case XMLStreamConstants.START_ELEMENT:
if (eventHandler != null) {
String startLocalName = reader.getLocalName();
eventHandler.onStartElement(depth);
// if handler has already consumed end element we must decrease the depth
if (reader.getEventType() == XMLStreamConstants.END_ELEMENT && reader.getLocalName().equals(startLocalName)) {
depth--;
}
}
depth++;
break;
case XMLStreamConstants.END_ELEMENT:
depth--;
break;
case XMLStreamConstants.CHARACTERS:
text = reader.getText();
break;
default:
break;
}
}
return text;
}
/**
* Get the attributes associated with the given START_ELEMENT or ATTRIBUTE
* StAXevent.
*
* @return the StAX attributes converted to an org.xml.sax.Attributes
*/
private Attributes getAttributes() {
AttributesImpl attrs = new AttributesImpl();
int eventType = staxStreamReader.getEventType();
if (eventType != XMLStreamConstants.ATTRIBUTE
&& eventType != XMLStreamConstants.START_ELEMENT) {
throw new InternalError(
"getAttributes() attempting to process: " + eventType);
}
// in SAX, namespace declarations are not part of attributes by default.
// (there's a property to control that, but as far as we are concerned
// we don't use it.) So don't add xmlns:* to attributes.
// gather non-namespace attrs
for (int i = 0; i < staxStreamReader.getAttributeCount(); i++) {
String uri = staxStreamReader.getAttributeNamespace(i);
if(uri==null) uri="";
String localName = staxStreamReader.getAttributeLocalName(i);
String prefix = staxStreamReader.getAttributePrefix(i);
String qName;
if(prefix==null || prefix.length()==0)
qName = localName;
else
qName = prefix + ':' + localName;
String type = staxStreamReader.getAttributeType(i);
String value = staxStreamReader.getAttributeValue(i);
attrs.addAttribute(uri, localName, qName, type, value);
}
return attrs;
}
@Nullable
public String getAttribute(@NotNull String nsUri, @NotNull String localName) {
try {
XMLStreamReader sr = epr.read("EndpointReference"/*doesn't matter*/);
while(sr.getEventType()!= XMLStreamConstants.START_ELEMENT)
sr.next();
return sr.getAttributeValue(nsUri,localName);
} catch (XMLStreamException e) {
// since we are reading from buffer, this can't happen.
throw new AssertionError(e);
}
}