最近看下Lucene的東西，把它寫下來可以看下。Lucene結構和工作原理我就不說了，網上好多。
我的環境是Lucene2.0
寫一個簡單使用Lucene的示例。此類首創建索引，然后顯示索引文檔的情況，最后搜索（只在content找，和在title或content里找）。
package net.blogjava.chenlb.lucene;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.queryParser.MultiFieldQueryParser;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
/**
* Lucene簡單使用
* @author chenlb 2008-3-8 下午11:42:55
*/
public class LuceneUse {
public static void main(String[] args) throws Exception {
LuceneUse liu = new LuceneUse();
//索引
IndexWriter iw = new IndexWriter("index", new StandardAnalyzer(), true);
//添加要索引的Lucene文檔
Document doc = liu.createDoc("Lucene創建索引示例", "chenlb", "2008-03-08", "Lucene索引的內容在這里,這些內容不被存儲.");
iw.addDocument(doc);
doc = liu.createDoc("文檔2", "bin", "2007-10-03", "這是索引的另一個文檔");
iw.addDocument(doc);
doc = liu.createDoc("學習內容", "chenlb", "2008-3-3", "要努力奮斗,祝網友們天天快樂");
iw.addDocument(doc);
iw.optimize(); //優化
iw.close();
//讀
System.out.println("===========索引文檔內容=============");
IndexReader reader = IndexReader.open("index");
for(int i=0; i<reader.numDocs(); i++) {
Document d = reader.document(i);
liu.printDoc(d);
}
System.out.println("===========以下是單域查找'天天'結果============");
//單域搜索
IndexSearcher searcher = new IndexSearcher("index");
QueryParser parser = new QueryParser("content", new StandardAnalyzer());
Query q = parser.parse("天天");
long start = System.currentTimeMillis();
Hits hits = searcher.search(q);
long end = System.currentTimeMillis();
for(int i=0; i<hits.length(); i++) {
liu.printDoc(hits.doc(i));
}
System.out.println("共找到: "+hits.length()+" 個文檔,花了:"+(end-start)+"ms");
//多域搜索
System.out.println("===========以下多域是查找'內容'結果============");
//從title或content找
q = MultiFieldQueryParser.parse("內容", new String[] {"title", "content"}, new BooleanClause.Occur[] {BooleanClause.Occur.SHOULD, BooleanClause.Occur.SHOULD}, new StandardAnalyzer());
start = System.currentTimeMillis();
hits = searcher.search(q);
end = System.currentTimeMillis();
for(int i=0; i<hits.length(); i++) {
liu.printDoc(hits.doc(i));
}
System.out.println("共找到: "+hits.length()+" 個文檔,花了:"+(end-start)+"ms");
}
/**
* 顯示文檔內容
*/
private void printDoc(Document d) {
System.out.println("標題: "+d.get("title")+", 作者: "+d.get("author")+", 日期: "+d.get("date")+", 內容: "+d.get("content"));
}
/**
* 創建一個Lucene文檔
*/
private Document createDoc(String title, String author, String date, String content) {
Document doc = new Document();
doc.add(new Field("title", title, Field.Store.YES, Field.Index.TOKENIZED));
doc.add(new Field("author", author, Field.Store.YES, Field.Index.NO));
doc.add(new Field("date", date, Field.Store.YES, Field.Index.NO));
doc.add(new Field("content", content, Field.Store.YES, Field.Index.TOKENIZED));
return doc;
}
}
posted on 2008-03-09 00:47
流浪汗 閱讀(972)
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