lucene3.6.1 经典案例 入门教程 (包含从文件中读取content)
转载http://liqita.iteye.com/blog/1676664
第一步:下载lucene的核心包
lucene-core-3.6.1-javadoc.jar (3.5 MB)
lucene-core-3.6.1.jar (1.5 MB)
拷贝到项目的lib 文件夹里
第二步:
在C盘下建立source文件夹 (C:\source)
source文件夹存放待索引的文件,例如,建立两个文件,名称为 test1.txt test2.txt 。
test1.txt文件内容为:欢迎来到绝对秋香的博客。
test2.txt文件内容为:绝对秋香引领你走向潮流。
在C盘下再建立index文件夹,存放索引文件 (C:\index)
第三步,建立索引类 TextFileIndexer ,并运行主函数
- package com.newtouchone.lucene;
- import java.io.BufferedReader;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.util.Date;
- import org.apache.lucene.analysis.Analyzer;
- import org.apache.lucene.analysis.standard.StandardAnalyzer;
- import org.apache.lucene.document.Document;
- import org.apache.lucene.document.Field;
- import org.apache.lucene.index.IndexWriter;
- import org.apache.lucene.index.IndexWriterConfig;
- import org.apache.lucene.index.IndexWriterConfig.OpenMode;
- import org.apache.lucene.store.Directory;
- import org.apache.lucene.store.FSDirectory;
- import org.apache.lucene.util.Version;
- public class TextFileIndexer {
- public static void main(String[] args) throws Exception {
- /* 指明要索引文件夹的位置,这里是C盘的source文件夹下 */
- File fileDir = new File("C:\\source");
- /* 这里放索引文件的位置 */
- File indexDir = new File("C:\\index");
- Directory dir = FSDirectory.open(indexDir);
- Analyzer luceneAnalyzer = new StandardAnalyzer(Version.LUCENE_36);
- IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_36,luceneAnalyzer);
- iwc.setOpenMode(OpenMode.CREATE);
- IndexWriter indexWriter = new IndexWriter(dir,iwc);
- File[] textFiles = fileDir.listFiles();
- long startTime = new Date().getTime();
- //增加document到索引去
- for (int i = 0; i < textFiles.length; i++) {
- if (textFiles[i].isFile()
- && textFiles[i].getName().endsWith(".txt")) {
- System.out.println("File " + textFiles[i].getCanonicalPath()
- + "正在被索引....");
- String temp = FileReaderAll(textFiles[i].getCanonicalPath(),
- "GBK");
- System.out.println(temp);
- Document document = new Document();
- Field FieldPath = new Field("path", textFiles[i].getPath(),
- Field.Store.YES, Field.Index.NO);
- Field FieldBody = new Field("body", temp, Field.Store.YES,
- Field.Index.ANALYZED,
- Field.TermVector.WITH_POSITIONS_OFFSETS);
- document.add(FieldPath);
- document.add(FieldBody);
- indexWriter.addDocument(document);
- }
- }
- indexWriter.close();
- //测试一下索引的时间
- long endTime = new Date().getTime();
- System.out
- .println("这花费了"
- + (endTime - startTime)
- + " 毫秒来把文档增加到索引里面去!"
- + fileDir.getPath());
- }
- public static String FileReaderAll(String FileName, String charset)
- throws IOException {
- BufferedReader reader = new BufferedReader(new InputStreamReader(
- new FileInputStream(FileName), charset));
- String line = new String();
- String temp = new String();
- while ((line = reader.readLine()) != null) {
- temp += line;
- }
- reader.close();
- return temp;
- }
- }
输出结果为:
- File C:\source\test1.txt正在被索引....
- 欢迎来到绝对秋香的博客。
- File C:\source\test2.txt正在被索引....
- 绝对秋香引领你走向潮流。
- 这花费了641 毫秒来把文档增加到索引里面去!C:\source
第四步,建立测试类TestQuery,并运行主函数,输出测试结果
- package com.newtouchone.lucene;
- import java.io.File;
- import java.io.IOException;
- import org.apache.lucene.analysis.Analyzer;
- import org.apache.lucene.analysis.standard.StandardAnalyzer;
- import org.apache.lucene.index.IndexReader;
- import org.apache.lucene.queryParser.ParseException;
- import org.apache.lucene.queryParser.QueryParser;
- import org.apache.lucene.search.IndexSearcher;
- import org.apache.lucene.search.Query;
- import org.apache.lucene.search.ScoreDoc;
- import org.apache.lucene.search.TopDocs;
- import org.apache.lucene.store.FSDirectory;
- import org.apache.lucene.util.Version;
- public class TestQuery {
- public static void main(String[] args) throws IOException, ParseException {
- String index = "C:\\index"; //搜索的索引路径
- IndexReader reader = IndexReader.open(FSDirectory.open(new File(index)));
- IndexSearcher searcher = new IndexSearcher(reader);
- ScoreDoc[] hits = null;
- String queryString = "绝对秋香"; //搜索的关键词
- Query query = null;
- Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_36);
- try {
- QueryParser qp = new QueryParser(Version.LUCENE_36,"body", analyzer);
- query = qp.parse(queryString);
- } catch (ParseException e) {
- }
- if (searcher != null) {
- TopDocs results = searcher.search(query,10); //返回最多为10条记录
- hits = results.scoreDocs;
- if (hits.length > 0) {
- System.out.println("找到:" + hits.length + " 个结果!");
- }
- searcher.close();
- }
- }
- }
测试输出结果为:
- 找到:2 个结果!
附件homework.rar为项目文件,解压部署则可运行该lucene案例
posted on 2015-12-10 11:51 1130136248 阅读(209) 评论(0) 编辑 收藏 举报