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用Lucene做一个简单的Java搜索工具2

2019年11月04日 栏目:教育

index(IndexWriter writer, File file, FileFilter filter)调用私有方法indexDire

index(IndexWriter writer, File file, FileFilter filter)调用私有方法indexDirectory(IndexWriter writer, File file, FileFilter filter)完成文件的索引。

下面是IndexException异常类。

IndexException.java

package powerwind;

publicclass IndexException extends Exception {

public IndexException(String message) {

super("Throw IndexException while indexing files: " + message);

}

}

下面是FileFilterFactory类,返回一个特定的文件过滤器(FileFilter)。

FileFilterFactory.java

package powerwind;

import java.io.*;

publicclass FileFilterFactory {

/**

*静态匿名内部类

*/

privatestatic FileFilter filter = new FileFilter() {

publicboolean accept(File file) {

long len;

return file.isDirectory()

(file.getName().endsWith(".java") &&

((len = file.length()) > 0) && len < 1024 * 1024);

}

};

publicstatic FileFilter getFilter() {

returnfilter;

}

}

main方法

/**

* main方法

*/

publicstaticvoid main(String[] args) throws Exception {

IndexJavaFiles ijf = new IndexJavaFiles();

Date start = new Date();

try {

IndexWriter writer = IndexWriterFactory.newInstance().createWriter("./index", true);

System.out.println("Indexing ...");

ijf.index(writer, new File("."), FileFilterFactory.getFilter());

System.out.println("Optimizing...");

writer.optimize();

writer.close();

Date end = new Date();

System.out.println(end.getTime() - start.getTime() + " total milliseconds");

} catch (IOException e) {

System.out.println(" caught a " + e.getClass() + "\n with message: " + e.getMessage());

}

}

SearchJavaFiles.java

package powerwind;

import java.io.*;

import org.apache.lucene.analysis.Analyzer;

import org.apache.lucene.analysis.standard.StandardAnalyzer;

import org.apache.lucene.document.Document;

import org.apache.lucene.index.IndexReader;

import org.apache.lucene.queryParser.*;

import org.apache.lucene.search.*;

publicclass SearchJavaFiles {

private IndexSearcher searcher;

private QueryParser parser;

/**

*

*@paramsearcher

*/

public SearchJavaFiles(IndexSearcher searcher) {

this.searcher = searcher;

}

/**

*

*@paramfield

*@paramanalyzer

*/

publicvoid setParser(String field, Analyzer analyzer) {

setParser(new QueryParser(field, analyzer));

}

/**

*@paramparser

*/

publicvoid setParser(QueryParser parser) {

this.parser = parser;

}

/**

*

*@paramquery

*@returnHits

*@throwsSearchException

*/

public Hits serach(Query query) throws SearchException {

try {

returnsearcher.search(query);

} catch (IOException ioe) {

thrownew SearchException(ioe.getMessage());

}

}

/**

*

*@paramqueryString

*@returnHits

*@throwsSearchException

*/

public Hits serach(String queryString) throws SearchException {

if (parser == null)

thrownew SearchException("parser is null!");

try {

returnsearcher.search(parser.parse(queryString));

} catch (IOException ioe) {

thrownew SearchException(ioe.getMessage());

} catch (ParseException pe) {

thrownew SearchException(pe.getMessage());

}

}

/**

*

*输出hits的结果,从start开始到end,不包括end

*

*@paramhits

*@paramstart

*@paramend

*@throwsSearchException

*/

publicstatic Hits display(Hits hits, int start, int end) throws SearchException {

try {

while (start < end) {

Document doc = hits.doc(start);

String path = doc.get("path");

if (path != null) {

System.out.println((start + 1) + "- " + path);

} else {

System.out.println((start + 1) + "- " + "No such path");

}

start++;

}

} catch (IOException ioe) {

thrownew SearchException(ioe.getMessage());

}

return hits;

}

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