无法实例化文档错误Lucene 6.2.0 API

Question

过去几天我开始在Java中使用Lucene 6.2.0，并尝试解析包含标签的.trectext文件。我相信我使用了正确的解析器来解析标签，但是在创建一个新的Lucene文档时遇到了这个奇怪的错误，它说Cannot instantiate the type Document。我恳请有人帮我解决这个问题，在互联网上我没有看到这方面的任何建议，eclipse也没有提出任何更正。不知道我哪里错了。我粘贴了下面的代码。 `

import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.DocumentBuilder; 
import org.apache.lucene.analysis.Analyzer; 
import org.apache.lucene.analysis.standard.StandardAnalyzer; 
import org.apache.lucene.document.StringField; 
import org.apache.lucene.index.DirectoryReader; 
import org.apache.lucene.index.IndexReader; 
import org.apache.lucene.index.IndexWriter; 
import org.apache.lucene.index.IndexWriterConfig; 
import org.apache.lucene.index.IndexWriterConfig.OpenMode; 
import org.apache.lucene.index.MultiFields; 
import org.apache.lucene.index.Term; 
import org.apache.lucene.index.Terms; 
import org.apache.lucene.store.Directory; 
import org.apache.lucene.store.FSDirectory; 
import org.apache.lucene.document.Field; 
import org.w3c.dom.Document; 
import org.w3c.dom.NodeList; 
import org.w3c.dom.Node; 
import org.w3c.dom.Element; 
import java.io.File; 
import java.io.FileFilter; 
import java.io.FileReader; 
import java.io.IOException; 
import java.nio.file.Paths; 
import java.io.Reader; 
import java.util.Iterator; 

public class Indexing { 
public static void main(String argv[]) { 
    String[] tags={"DOCNO","HEAD","BYLINE","DATELINE","TEXT"}; 
    try { 
    String indexPath="C:\\Users\\sujit\\Desktop\\lucene_indexed"; //Path to create the Lucene Document Index. 
    File fXmlFile = new File("C:\\Users\\sujit\\Desktop\\sample.txt"); //Path to find the document to be indexed. 

    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); 
    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); 
    Document doc = dBuilder.parse(fXmlFile); 
    doc.getDocumentElement().normalize(); 

    Analyzer analyzer=new StandardAnalyzer(); 
    Directory dir = FSDirectory.open(Paths.get(indexPath)); 
    IndexWriterConfig iwc = new IndexWriterConfig(analyzer); 
    iwc.setOpenMode(OpenMode.CREATE); 
    IndexWriter writer=new IndexWriter(dir,iwc); 
    String DocNo="" ,Head="",ByLine="",DateLine="",Text=""; 

    //System.out.println("Root element :" + doc.getDocumentElement().getNodeName()); 
    NodeList nList = doc.getElementsByTagName("DOC"); 
    //System.out.println("----------------------------"); 
    for (int temp = 0; temp < nList.getLength(); temp++) { 
     //**Place where I see the error ** 
     Document luceneDoc=new Document(); 

     Node nNode = nList.item(temp); 
     System.out.println("\nCurrent Element :" + nNode.getNodeName()); 
     if (nNode.getNodeType() == Node.ELEMENT_NODE) { 
      Element eElement = (Element) nNode; 
      for(int tagNo=0;tagNo<tags.length;tagNo++){ 

       for(int j=0;j<eElement.getElementsByTagName(tags[tagNo]).getLength();j++){ 
        if(tags[tagNo]==tags[0]) 
         DocNo+=eElement.getElementsByTagName(tags[tagNo]).item(j).getTextContent(); 
        else if(tags[tagNo]==tags[1]) 
         Head+=eElement.getElementsByTagName(tags[tagNo]).item(j).getTextContent(); 
        else if(tags[tagNo]==tags[2]) 
         ByLine+=eElement.getElementsByTagName(tags[tagNo]).item(j).getTextContent(); 
        else if(tags[tagNo]==tags[3]) 
         DateLine+=eElement.getElementsByTagName(tags[tagNo]).item(j).getTextContent(); 
        else if(tags[tagNo]==tags[4]) 
         Text+=eElement.getElementsByTagName(tags[tagNo]).item(j).getTextContent(); 
       } 
       System.out.println(DocNo+Head+ByLine+DateLine+Text+"\n"); 
       luceneDoc.add(new StringField("DOCNO",DocNo,Field.Store.YES)); 
       luceneDoc.add(new StringField("HEAD",Head,Field.Store.YES)); 
       luceneDoc.add(new StringField("BYLINE",ByLine,Field.Store.YES)); 
       luceneDoc.add(new StringField("DATELINE",DateLine,Field.Store.YES)); 
       luceneDoc.add(new StringField("TEXT",Text,Field.Store.YES)); 
       writer.addDocument(luceneDoc); 
       DocNo="";Head="";ByLine="";DateLine="";Text=""; 
      } 
      writer.close(); 
     } 
    } 
    } catch (Exception e) { 
    e.printStackTrace(); 
    } 
    } 

} 

Answer 1

要导入org.w3c.dom.Document，而不是org.apache.lucene.document.Document。既然你似乎都需要，你可以用完整路径引用其中的一个，而不是导入它。