您好我正在使用Lucene索引我的数据库记录,但我无法解决此错误。
错误:
线程“main”中的异常java.lang.Error:未解决的编译问题: 目录无法解析为某种类型 FSDirectory类型中的open(Path)方法不适用于参数(File)
在lucene.Lucenetest.main(Lucenetest.java:32)
CODE:
package lucene;
import java.io.File;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import org.apache.lucene.analysis.core.SimpleAnalyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.DateTools;
import org.apache.lucene.document.DateTools.Resolution;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
public class Lucenetest {
//database connection
public static final String PATH = "C:/dbindex/index.txt";
private static final String JDBC_DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
private static final String CONNECTION_URL = "jjdbc:sqlserver://WMDENTW1\\SQLEXPRESS:1433;" +
"database=FullTextDB;" +
"user=root;" +
"password=root123";
private static final String QUERY = "select FTID, ID, CLASSID, TEXT, PUBNOTICECONTENT, DOCUMENTCONTENT, contentSum_DE from METADATA_FULLTEXT";
public static void main(String[] args) throws Exception {
Lucenetest indexer = new Lucenetest();
//error here
***Directory indexDir = FSDirectory.open(new File(PATH));***
try{
//index writer
Class.forName(JDBC_DRIVER).newInstance();
Connection conn = DriverManager.getConnection(CONNECTION_URL);
StandardAnalyzer analyzer = new StandardAnalyzer();
IndexWriterConfig Config = new IndexWriterConfig(analyzer);
IndexWriter indexWriter = new IndexWriter(indexDir, Config);
System.out.println("Indexing to directory '" + indexDir + "'...");
int indexedDocumentCount = indexer.indexDocs1(indexWriter, conn);
indexWriter.close();
System.out.println(indexedDocumentCount + " records have been indexed successfully");
} catch (Exception e) {
e.printStackTrace();
}
}
@SuppressWarnings("deprecation")
int indexDocs1(IndexWriter writer, Connection conn) throws Exception {
String sql = QUERY;
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
int i=0;
while (rs.next()) {
//检查null并允许它添加
String FTID = resultSet.getString("FTID"); //!= null ? resultSet.getString("FTID"): " ";
String ID = resultSet.getString("ID")!= null ? resultSet.getString("ID"): " ";
String CLASSID = resultSet.getString("CLASSID")!= null ? resultSet.getString("CLASSID"): " ";
String TEXT = resultSet.getString("TEXT")!= null ? resultSet.getString("TEXT"): " ";
String PUBNOTICECONTENT = resultSet.getString("PUBNOTICECONTENT")!= null ? resultSet.getString("PUBNOTICECONTENT"): " ";
String DOCUMENTCONTENT = resultSet.getString("DOCUMENTCONTENT")!= null ? resultSet.getString("DOCUMENTCONTENT"): " ";
String contentSum_DE = resultSet.getString("contentSum_DE")!= null ? resultSet.getString("contentSum_DE"): " ";
Document d = new Document();
d.add(new Field("FTID", rs.getString("FTID"), Field.Store.YES, Field.Index.NOT_ANALYZED));
d.add(new Field("ID", rs.getString("ID"), Field.Store.YES, Field.Index.NOT_ANALYZED ));
d.add(new Field("CLASSID", rs.getString("CLASSID"), Field.Store.YES, Field.Index.ANALYZED));
if (writer.getConfig().getOpenMode() == OpenMode.CREATE) {
// New index, so we just add the document (no old document can be there):
System.out.println("adding " + FTID + " ---- " + ID + "---- " + CLASSID);
writer.addDocument(doc);
}
}
} catch (Exception e) {
System.out.println(e);
}
答案 0 :(得分:1)
错误清楚地表明Lucenetest无法编译。
原因是FSDirectory期望java.nio.file.Path
但收到不兼容的java.io.File
。
看起来代码是为之前版本的Lucene开发的,它接受了文件https://lucene.apache.org/core/3_0_3/api/core/org/apache/lucene/store/FSDirectory.html。最近的Lucene版本期望Path https://lucene.apache.org/core/5_3_0/core/index.html?org/apache/lucene/store/FSDirectory.html。
解决方案是将错误更改为
Directory indexDir = FSDirectory.open(new File(PATH).toPath());