Question

我尝试针对java中的相对XSD文件验证某些XML

输入文件temp.xml：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<tagname:b
        xmlns:tagname="http://my_namespace.org/v1"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://my_namespace.org/v1 ./local_xsd_file.xsd">
</tagname>

java source：

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(true);
factory.setNamespaceAware(true);
factory.setAttribute("http://java.sun.com/xml/jaxp/properties/schemaLanguage", "http://www.w3.org/2001/XMLSchema");
DocumentBuilder builder = factory.newDocumentBuilder();
builder.setErrorHandler(new RaiseOnErrorHandler());
builder.parse(new InputSource(new FileInputStream(filename)));

public static class RaiseOnErrorHandler implements ErrorHandler {
  public void warning(SAXParseException e) throws SAXException {
    throw new RuntimeException(e);
  }
  public void error(SAXParseException e) throws SAXException {
    throw new RuntimeException(e);
  }
  public void fatalError(SAXParseException e) throws SAXException {
    throw new RuntimeException(e);
  }
}

本地文件local_xsd_file.xsd存在且似乎未被阅读。

错误消息

java.lang.RuntimeException: org.xml.sax.SAXParseException; lineNumber: 5; columnNumber: 85; schema_reference.4: Failed to read schema document './local_xsd_file.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
    at org.XX$RaiseOnErrorHandler.warning(DigitalFileWriterTest.java:1114)
    at org.apache.xerces.util.ErrorHandlerWrapper.warning(Unknown Source)
    at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
    at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
    at org.apache.xerces.impl.xs.traversers.XSDHandler.reportSchemaWarning(Unknown Source)
    at org.apache.xerces.impl.xs.traversers.XSDHandler.getSchemaDocument(Unknown Source)
    at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaLoader.loadSchema(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaValidator.findSchemaGrammar(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    ... 50 more

我还尝试使用file://local_xsd_file.xsd和file://./local_xsd_file.xsd（should为possible）作为schemaLocation，所有结果都相同。如果我使用＆＃34;绝对路径＆＃34;像file:///full/path/to/local_xsd_file.xsd那样可行。如果我使用URL作为架构的位置，它会从该服务器读取它们并且工作正常。

将我当前的工作目录更改为local_xsd_file.xsd存在的目录将使其正常工作，所以显然这可以工作但只相对于您当前的工作目录？

是否可以在java中使用相对路径进行验证？感觉就像是一个实现细节？

Answer 1

当您构建这样的文档时：

DocumentBuilder builder = factory.newDocumentBuilder();
builder.setErrorHandler(new RaiseOnErrorHandler());
builder.parse(new InputSource(new FileInputStream(filename)));

文档的基本URI未知（因为构建器只看到InputStream，并且无法发现它正在读取特定文件）。尝试使用可以建立基URI的parse()方法之一，例如parse(file.toString())或saxParser.parse(file, (DefaultHandler) null);。

没有基本URI，没有合理的方法来解析相对URI。系统可能使用当前目录（这似乎在这里发生）或者它可能报告错误。

Answer 2

对于追随者，如果您正在使用外部模式文件进行验证，那么似乎也可以，只需避免先将其更改为字符串，例如：

public static void verifyMatchesXsd(File xmlFileToTest, File schemaFile) throws IOException, SAXException {
    Source xmlFile = new StreamSource(xmlFileToTest);
    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    Schema schema = schemaFactory.newSchema(schemaFile);
    javax.xml.validation.Validator validator = schema.newValidator();
    validator.validate(xmlFile);
}

或版本，而不必指定外部XSD的位置（它使用内部XSD）：

  private void assertMatchesAnyXsdsMentioned(File xmlFileLocation) throws SAXException, IOException {
    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    Schema schema = schemaFactory.newSchema();
    Validator validator = schema.newValidator();
    Source xmlSource = new StreamSource(xmlFileLocation);
    validator.validate(xmlSource);
  }

您也许还可以指定自己的resource resolver，让它也知道您想要哪个子目录...

Sax解析器版本：

  static void assertMatchesInternalXsd(File inputFile) throws Exception {
    SAXParserFactory spf = SAXParserFactory.newInstance();
    spf.setValidating(true);
    spf.setNamespaceAware(true);
    SAXParser saxParser = spf.newSAXParser();
    saxParser.setProperty(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
    XMLReader reader = saxParser.getXMLReader();
    reader.setErrorHandler(new RaiseOnErrorHandler());
    saxParser.parse(inputFile, (DefaultHandler) null);
  }

使用schemaLocation本地文件的java验证失败

2 个答案: