Lucene HelloWorld

Lucene HelloWorld

Lucene教程 - Lucene HelloWorld我们可以使用Lucene为您的应用程序添加全文搜索功能。索引我们将从一些字符串创建一个内存索引。StandardAnalyzer analyzer = new StandardAnalyzer(Version.LATEST);

Directory index = new RAMDirectory();

IndexWriterConfig config = new IndexWriterConfig(Version.LATEST, analyzer);

IndexWriter w = new IndexWriter(index, config);

addDoc(w, "Lucene in Action", "1");

addDoc(w, "Lucene for Dummies", "2");

addDoc(w, "Java", "3");

addDoc(w, "Oracle", "4");

w.close();

private static void addDoc(IndexWriter w, String title, String isbn) throws IOException {

Document doc = new Document();

doc.add(new TextField("title", title, Field.Store.YES));

doc.add(new StringField("isbn", isbn, Field.Store.YES));

w.addDocument(doc);

}

TextField对内容进行标记化，而StringField不对其内容进行标记化。查询以下代码显示了如何从Java字符串构建查询。String querystr = "lucene";

Query q = new QueryParser(Version.LATEST, "title", analyzer).parse(querystr);

搜索当进行搜索时，我们首先打开索引，这是一个内存索引。TopScoreDocCollector用于收集前10个评分点击。int hitsPerPage = 10;

IndexReader reader = IndexReader.open(index);

IndexSearcher searcher = new IndexSearcher(reader);

TopScoreDocCollector collector = TopScoreDocCollector.create(hitsPerPage, true);

searcher.search(q, collector);

ScoreDoc[] hits = collector.topDocs().scoreDocs;

显示以下是显示结果的逻辑。 System.out.println("Found " + hits.length + " hits.");

for(int i=0;i<hits.length;++i) {

int docId = hits[i].doc;

Document d = searcher.doc(docId);

System.out.println(d.get("isbn") );

System.out.println(d.get("title") );

}

完整代码import org.apache.lucene.analysis.standard.StandardAnalyzer;

import org.apache.lucene.document.Document;

import org.apache.lucene.document.Field;

import org.apache.lucene.document.StringField;

import org.apache.lucene.document.TextField;

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.queryparser.classic.ParseException;

import org.apache.lucene.queryparser.classic.QueryParser;

import org.apache.lucene.search.IndexSearcher;

import org.apache.lucene.search.Query;

import org.apache.lucene.search.ScoreDoc;

import org.apache.lucene.search.TopScoreDocCollector;

import org.apache.lucene.store.Directory;

import org.apache.lucene.store.RAMDirectory;

import org.apache.lucene.util.Version;

import java.io.IOException;

public class Main {

@SuppressWarnings("deprecation")

public static void main(String[] args) throws IOException, ParseException {

StandardAnalyzer analyzer = new StandardAnalyzer(Version.LATEST);
Directory index = new RAMDirectory();
IndexWriterConfig config = new IndexWriterConfig(Version.LATEST, analyzer);
IndexWriter w = new IndexWriter(index, config);
addDoc(w, "Lucene in Action", "1");
addDoc(w, "Lucene for Dummies", "2");
addDoc(w, "Java", "3");
addDoc(w, "Oracle", "4");
w.close();
String querystr = "lucene";
Query q = new QueryParser(Version.LATEST, "title", analyzer).parse(querystr);
int hitsPerPage = 10;
IndexReader reader = DirectoryReader.open(index);
IndexSearcher searcher = new IndexSearcher(reader);
TopScoreDocCollector collector = TopScoreDocCollector.create(hitsPerPage, true);
searcher.search(q, collector);
ScoreDoc[] hits = collector.topDocs().scoreDocs;
System.out.println("Found " + hits.length + " hits.");
for(int i=0;i<hits.length;++i) {
  int docId = hits[i].doc;
  Document d = searcher.doc(docId);
  System.out.println(d.get("isbn") );
  System.out.println(d.get("title") );
}
reader.close();

}

private static void addDoc(IndexWriter w, String title, String isbn) throws IOException {

Document doc = new Document();

doc.add(new TextField("title", title, Field.Store.YES));

doc.add(new StringField("isbn", isbn, Field.Store.YES));

w.addDocument(doc);

}

}

下载下载源代码和库。下载 Lucene_HelloWorld.zip