java使用Saxon/XQuery设置URI或目录解析器
我正在用Java开发一个简单的命令行应用程序，从一个大型XML数据集（15000多个XML文件）中挖掘数据。我选择使用Saxon S9API作为XQuery处理器。只要开放访问internet，Saxon使用的解析器就可以解析xsi:noNamespaceSchemaLocation URI（或者我假设的任何其他URI），一切都可以正常工作
我已经搜索了Stackoverflow，以及一般的Google搜索，寻找关于如何向XQuery处理器提供目录的答案。我还没有找到一个很好的解释来说明如何这样做
这是我在这一点上的简单代码，正如我所说的，它在开放访问互联网时工作良好：
package ipd.part.info.mining.app;
import java.io.File;
import java.util.List;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import net.sf.saxon.Configuration;
import net.sf.saxon.TransformerFactoryImpl;
import net.sf.saxon.s9api.DOMDestination;
import net.sf.saxon.s9api.Processor;
import net.sf.saxon.s9api.QName;
import net.sf.saxon.s9api.SaxonApiException;
import net.sf.saxon.s9api.XQueryCompiler;
import net.sf.saxon.s9api.XQueryEvaluator;
import net.sf.saxon.s9api.XQueryExecutable;
import net.sf.saxon.s9api.XdmAtomicValue;
import net.sf.saxon.lib.*;
import static org.apache.xerces.jaxp.JAXPConstants.JAXP_SCHEMA_LANGUAGE;
import static org.apache.xerces.jaxp.JAXPConstants.W3C_XML_SCHEMA;
import org.apache.xerces.util.XMLCatalogResolver;
import org.apache.xml.resolver.tools.CatalogResolver;
import org.w3c.dom.Document;
import org.xml.sax.ErrorHandler;
/**
*
* @author tfurst
*/
public class IPDPartInfoMiningApp {
/**
* @param args the command line arguments
*/
private static Scanner scanner = new Scanner(System.in);
private static String ietmPath;
private static String outputPath;
private static CatalogResolver resolver;
private static org.apache.xerces.util.XMLCatalogResolver xres;
private static ErrorHandler eHandler;
private static DocumentBuilderFactory DBF;
private static DocumentBuilder DB;
public static void main(String[] args) {
initDb();
try {
// TODO code application logic here
System.out.println("Enter path to complete IETM Export:");
ietmPath = scanner.nextLine();
System.out.println("Enter path to save report:");
outputPath = scanner.nextLine();
Processor proc = new Processor(true);
XQueryCompiler comp = proc.newXQueryCompiler();
//File xq = fixXquery(new File(XQ));
//XQueryExecutable exp = comp.compile(xq);
XQueryExecutable exp = comp.compile("declare variable $path external;\n" +
"\n" +
"let $coll := collection(concat($path,'?select=*.xml'))//itemSequenceNumber \n" +
"\n" +
"return\n" +
"<parts>\n" +
"{\n" +
" for $mod in $coll\n" +
" let $pn := normalize-space($mod/partNumber)\n" +
" let $nomen := $mod/partIdentSegment[1]/descrForPart\n" +
" let $smr := $mod/locationRcmdSegment/locationRcmd/sourceMaintRecoverability\n" +
" order by $pn\n" +
" return <part pn=\"{$pn}\" nomen=\"{$nomen}\" smr=\"{$smr}\"/>\n" +
"}\n" +
"</parts>");
//Serializer out = proc.newSerializer(System.out);
Document dom = DB.newDocument();
XQueryEvaluator ev = exp.load();
ev.setExternalVariable(new QName("path"), new XdmAtomicValue(new File(ietmPath).toPath().toUri().toString().substring(0, new File(ietmPath).toPath().toUri().toString().lastIndexOf("/"))));
ev.run(new DOMDestination(dom));
TransformerFactoryImpl tfact = new net.sf.saxon.TransformerFactoryImpl();
Transformer trans = tfact.newTransformer();
DOMSource src = new DOMSource(dom);
StreamResult res = new StreamResult(new File(outputPath + File.separator + "output.xml"));
trans.transform(src, res);
} catch (SaxonApiException | TransformerException ex) {
Logger.getLogger(IPDPartInfoMiningApp.class.getName()).log(Level.SEVERE, null, ex);
}
}
private static XMLCatalogResolver createXMLCatalogResolver(CatalogResolver resolver)
{
int i = 0;
List files = resolver.getCatalog().getCatalogManager().getCatalogFiles();
String[] catalogs = new String[files.size()];
XMLCatalogResolver xcr = new XMLCatalogResolver();
for(Object file : files)
{
catalogs[i] = new File(file.toString()).getAbsolutePath();
}
xcr.setCatalogList(catalogs);
return xcr;
}
private static void initDb()
{
try
{
resolver = new CatalogResolver();
eHandler = new DocumentErrorHandler();
xres = createXMLCatalogResolver(resolver);
DBF = DocumentBuilderFactory.newInstance();
DBF.setAttribute(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
DBF.setNamespaceAware(true);
DB = DBF.newDocumentBuilder();
DB.setEntityResolver(xres);
DB.setErrorHandler(eHandler);
}
catch (ParserConfigurationException ex)
{
ex.printStackTrace();
}
}
}
当我断开计算机与网络的连接时，我收到此错误：
C:\Users\tfurst\Desktop\XQuery Test\testXml\test\tool>java -jar IPD_Part_Info_Mining_App.jar
Enter path to complete IETM Export:
C:\Users\tfurst\Desktop\Wire Repl Testing
Enter path to save report:
C:\Users\tfurst\Desktop\Wire Repl Testing\report
Error on line 6 column 2
collection(): failed to parse XML file
file:/C:/Users/tfurst/Desktop/Wire%20Repl%20Testing/DMC-HH60W-A-52-21-0001-04AAA-520A-B.xml: I/O error reported by XML parser processing file:/C:/Users/tfurst/Desktop/Wire%20Repl%20Testing/DMC-HH60W-A-52-21-0001-04AAA-520A-B.xml: Read timed out
Aug 20, 2019 2:55:23 PM ipd.part.info.mining.app.IPDPartInfoMiningApp main
SEVERE: null
net.sf.saxon.s9api.SaxonApiException: collection(): failed to parse XML file file:/C:/Users/tfurst/Desktop/Wire%20Repl%20Testing/DMC-HH60W-A-52-21-0001-04AAA-520A-B.xml: I/O error reported by XML parser processing file:/C:/Users/tfurst/Desktop/Wire%20Repl%20Testing/DMC-HH60W-A-52-21-0001-04AAA-520A-B.xml: Read timed out
at net.sf.saxon.s9api.XQueryEvaluator.run(XQueryEvaluator.java:372)
at ipd.part.info.mining.app.IPDPartInfoMiningApp.main(IPDPartInfoMiningApp.java:80)
Caused by: net.sf.saxon.trans.XPathException: collection(): failed to parse XML file file:/C:/Users/tfurst/Desktop/Wire%20Repl%20Testing/DMC-HH60W-A-52-21-0001-04AAA-520A-B.xml: I/O error reported by XML parser processing file:/C:/Users/tfurst/Desktop/Wire%20Repl%20Testing/DMC-HH60W-A-52-21-0001-04AAA-520A-B.xml: Read timed out
at net.sf.saxon.resource.XmlResource.getItem(XmlResource.java:113)
at net.sf.saxon.functions.CollectionFn$2.mapItem(CollectionFn.java:246)
at net.sf.saxon.expr.ItemMappingIterator.next(ItemMappingIterator.java:113)
at net.sf.saxon.expr.ItemMappingIterator.next(ItemMappingIterator.java:108)
at net.sf.saxon.expr.ItemMappingIterator.next(ItemMappingIterator.java:108)
at net.sf.saxon.om.FocusTrackingIterator.next(FocusTrackingIterator.java:85)
at net.sf.saxon.expr.ContextMappingIterator.next(ContextMappingIterator.java:59)
at net.sf.saxon.expr.sort.DocumentOrderIterator.<init>(DocumentOrderIterator.java:47)
at net.sf.saxon.expr.sort.DocumentSorter.iterate(DocumentSorter.java:230)
at net.sf.saxon.expr.flwor.ForClausePush.processTuple(ForClausePush.java:34)
at net.sf.saxon.expr.flwor.FLWORExpression.process(FLWORExpression.java:841)
at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:337)
at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:284)
at net.sf.saxon.expr.instruct.Instruction.process(Instruction.java:151)
at net.sf.saxon.query.XQueryExpression.run(XQueryExpression.java:411)
at net.sf.saxon.s9api.XQueryEvaluator.run(XQueryEvaluator.java:370)
... 1 more
C:\Users\tfurst\Desktop\XQuery Test\testXml\test\tool>pause
Press any key to continue . . .
我相信这可能是一个相对简单的解决方案，很可能是我忽略了的。我知道在使用XSL转换时如何处理这个问题，方法是提供一个目录和模式的位置。提前感谢您的帮助，非常感谢
# 1 楼答案
要使用XML目录文件，应在代码中执行以下操作：