如何遍歷目錄和子目錄中的所有XML文件以使用java讀取特定元素？

我有一個目錄，它有一些子目錄。
它包含一些xml文件，它可能具有相同的文件名，但在不同的目錄中。
現在我想讀取所有的XML文件來獲取XML元素並存儲在數組列表中。
但是，當解析一個xml文件時它會拋出一個錯誤，如java.io.FileNotFoundException：\ BDOPS-4 \ ORDERS \ CreateCLELE \ APRIL-2016 \ 28-04-2016 \ 8449066_1 \ ItemFile \ 1461809102571_4 \ ftp \ content-providers \ ewh-e \ data \ incoming \ OBI00000000001818A \ OBI00000000001818 \ 00012092 \ v103i5 \ si540.dtd（系統找不到指定的文件）
該目錄沒有它搜索的文件（si540.dtd）。任何人都可以幫助我解決這個問題。下面我提供了我的代碼與堆棧跟蹤。

package Read_XML; 
import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.StringReader; 
import java.util.ArrayList; 
import java.util.List; 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import org.apache.commons.io.FileUtils; 
import org.apache.commons.io.filefilter.TrueFileFilter; 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 
import org.xml.sax.InputSource; 
import DB_INFO.DOI; 
import DB_INFO.Insert_Missing_DOI; 
public class Read_DOI { 
public static void read_XML_for_DOI(String root_path){ 

    System.out.println("Received Incoming path : "+root_path); 

    File f = null; 
    try { 
     String root = root_path; 
     f = new File(root); 
     //shall accept all files in directories and subdirectories 
     List<File> files = (List<File>) FileUtils.listFiles(f,  
TrueFileFilter.INSTANCE, TrueFileFilter.INSTANCE); 
     ArrayList<String> issn_valueLst = new ArrayList<>(); 
     for (File fXmlFile : files) { 
      // prints filename and directory name 
      if(accept(fXmlFile.getName(), ".xml")){ 
      DocumentBuilderFactory dbFactory = 
DocumentBuilderFactory.newInstance(); 
      DocumentBuilder dBuilder = 
dbFactory.newDocumentBuilder();   
      System.out.println("XML Name::"+fXmlFile.getName()); 
      Document doc = dBuilder.parse(fXmlFile); 
      doc.getDocumentElement().normalize(); 
      System.out.println("Traversing File : "+fXmlFile.getName()); 
      System.out.println("Traversing path : 
"+fXmlFile.getAbsolutePath()); 
      NodeList nList2=doc.getElementsByTagName("ce:doi"); 
      //NodeList nList2=doc.getElementsByTagName("DOI"); 

      if(nList2.getLength()>=1) 
      { 
       for (int temp2 = 0; temp2 < nList2.getLength(); 
temp2++) { 
        Node nNode4 = nList2.item(temp2); 

        if (nNode4.getNodeType() == Node.ELEMENT_NODE) 
        { 
         Element eElement1 = (Element) nNode4; 
         issn_valueLst.add(eElement1.getTextContent()); 
         //issn_valueLst.add(System.lineSeparator()); 
        } 
          } 
       } 
      } 
     } 

     System.out.println("DOI IN DB : "+DOI.DOI_values.toString()); 

     System.out.println("The DOI Values in INPUT XML : 
"+issn_valueLst.toString()); 
     System.out.println("Total number of DOI in INout XML : 
"+issn_valueLst.size()); 

     //secondList.removeAll(firstList); 

     issn_valueLst.removeAll(DOI.DOI_values); 


     if(issn_valueLst.size()>0) 
     { 
      System.out.println("\nThe Missing new DOI in the Input XML : 
"+issn_valueLst.toString()); 
      Insert_Missing_DOI.insert_DOI(issn_valueLst.toString()); 
     } 
     else 
     { 
      System.out.println("ALL DOI are available in input xml"); 
     } 
     System.out.println(); 



     // } 
    } 
    catch(FileNotFoundException fe) 
    { 

     System.out.println("File not found"); 
     fe.printStackTrace(); 
    } 

    catch (Exception e) { 
     // if any error occurs 
     e.printStackTrace(); 
    } 


} 



    public static boolean accept(String name, String str) { 
    return name.toLowerCase().endsWith(str.toLowerCase()); 
    } 
}

堆棧跟蹤：

java.io.FileNotFoundException: \\BDOPS-4\ORDERS\CreateCLELE\APRIL-2016\28-04-2016\8449066_1\ItemFile\1461809102571_4\ftp\content-providers\ewh-e\data\incoming\OBI00000000001818A\OBI00000000001818\00012092\v103i5\si540.dtd (The system cannot find the file specified) 
    at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) 
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) 
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) 
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) 
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source) 
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source) 
    at javax.xml.parsers.DocumentBuilder.parse(Unknown Source) 
    at Read_XML.Read_DOI.read_XML_for_DOI(Read_DOI.java:49) 
    at Incoming_folder_path.find_incoming_dir.findDirectory(find_incoming_dir.java:29) 
    at Incoming_folder_path.find_incoming_dir.findDirectory(find_incoming_dir.java:32) 
    at Incoming_folder_path.find_incoming_dir.findDirectory(find_incoming_dir.java:32) 
    at Incoming_folder_path.find_incoming_dir.findDirectory(find_incoming_dir.java:32) 
    at Incoming_folder_path.find_incoming_dir.findDirectory(find_incoming_dir.java:32) 
    at Incoming_folder_path.find_incoming_dir.findDirectory(find_incoming_dir.java:32) 
    at Incoming_folder_path.find_incoming_dir.findDirectory(find_incoming_dir.java:32) 
    at Incoming_folder_path.find_incoming_dir.find(find_incoming_dir.java:15) 
    at Extraction.ZipExtraction.extract(ZipExtraction.java:41) 
    at execution_Point.Exact_orderpath.find_exact_path(Exact_orderpath.java:24) 
    at execution_Point.Get_orderpath.getorderpath_from_orderinfo(Get_orderpath.java:53) 
    at execution_Point.Get_order_from_marker.starter_pub(Get_order_from_marker.java:270) 
    at execution_Point.Cl_Execute.main(Cl_Execute.java:47)

來源

2016-05-04 Ilavarasan Jayaraman

最有可能的異常指示您沒有權限讀取文件。從FileNotFoundException documentation：

此異常...也將拋出...如果該文件確實存在，但由於某種原因無法訪問......。

異常名稱對於該類型的錯誤沒有太大意義，是嗎？ java.io.File是一個非常古老的類，它來自Java 1.0。如果您想了解更多有用的反饋，使用現代化的替代文件，該Path類：

Path f = Paths.get(root); 
try (DirectoryStream<Path> dir = Files.newDirectoryStream(f, "*.xml")) { 
    for (Path fXmlFile : dir) { 
     DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();   
     System.out.println("XML Name::" + fXmlFile.getFileName()); 
     Document doc; 
     try (InputStream stream = Files.newInputStream(fXmlFile)) { 
      doc = dBuilder.parse(stream); 
     } 
     // etc. 
    } 
}

來源

2016-05-04 11:38:40 VGR

@ VGR：謝謝你寶貴的時間。我找到了解決方案。 –

這是由於實體解決的問題。

以下代碼通過忽略實體解析過程來解決問題。

來源

2016-05-04 12:38:42

如何遍歷目錄和子目錄中的所有XML文件以使用java讀取特定元素？

回答

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