Lucene02---Lucene入门与Demo

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IndexWriter:Lucene中最重要的的类之一，它主要是用来将文档加入索引，同时控制索引过程中的一些参数使用。操作索引库???

lucene-core-3.5.0.jar（核心）

lucene-analyzers-3.5.0.jar（分词器）

lucene-highlighter-3.5.0.jar（高亮器）

package com.iflytek.lucene;import java.io.File;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.index.IndexWriter;import org.apache.lucene.index.IndexWriterConfig;import org.apache.lucene.queryParser.MultiFieldQueryParser;import org.apache.lucene.queryParser.QueryParser;import org.apache.lucene.search.Filter;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.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.util.Version;/** * @author xudongwang 2012-2-2 * * Email:xdwangiflytek@gmail.com */public class FirstLucene {/** * 源文件路径 */private String filePath01 = "F:\\Workspaces\\workspaceSE\\BlogDemo\\luceneDatasource\\HelloLucene01.txt";private String filePath02 = "F:\\Workspaces\\workspaceSE\\BlogDemo\\luceneDatasource\\HelloLucene02.txt";private String filePath03 = "F:\\Workspaces\\workspaceSE\\BlogDemo\\luceneDatasource\\HelloLucene03.txt";/** * 索引路径 */private String indexPath = "F:\\Workspaces\\workspaceSE\\BlogDemo\\luceneIndex";/** * 分词器，这里我们使用默认的分词器,标准分析器（好几个，但对中文的支持都不好） */private Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_35);/** * 创建索引 * * @throws Exception */public void createIndex() throws Exception {Document document01 = File2Document.file2Document(filePath01);// 要进行索引的单元Document document02 = File2Document.file2Document(filePath02);Document document03 = File2Document.file2Document(filePath03);// 将Document添加到索引库中File indexFile = new File(indexPath);Directory directory = FSDirectory.open(indexFile);// IndexWriter是用来操作（增、删、改）索引库的// true，表示每次都创建新的，有了就删掉再创建IndexWriterConfig conf = new IndexWriterConfig(Version.LUCENE_35,analyzer);IndexWriter indexWriter = new IndexWriter(directory, conf);indexWriter.addDocument(document01);indexWriter.addDocument(document02);indexWriter.addDocument(document03);indexWriter.close();// 涉及到资源的都需要释放}/** * 搜索 * * @param queryStr * 搜索的关键词 * @throws Exception */public void search(String queryStr) throws Exception {// 1、把要搜索的文本解析为Query对象// 指定在哪些字段查询String[] fields = { "name", "content" };// QueryParser: 是一个解析用户输入的工具，可以通过扫描用户输入的字符串，生成Query对象。QueryParser queryParser = new MultiFieldQueryParser(Version.LUCENE_35,fields, analyzer);// Query:查询，lucene中支持模糊查询，语义查询，短语查询，组合查询等等,如有TermQuery,BooleanQuery,RangeQuery,WildcardQuery等一些类。Query query = queryParser.parse(queryStr);// 2、进行查询File indexFile = new File(indexPath);// IndexSearcher 是用来在索引库中进行查询的// IndexSearcher indexSearcher = new// IndexSearcher(FSDirectory.open(indexFile));Directory directory = FSDirectory.open(indexFile);IndexReader indexReader = IndexReader.open(directory);IndexSearcher indexSearcher = new IndexSearcher(indexReader);// Filter 过滤器，我们可以将查出来的结果进行过滤，可以屏蔽掉一些不想给用户看到的内容Filter filter = null;// 10000表示一次性在数据库中查询多少个文档// topDocs 类似集合TopDocs topDocs = indexSearcher.search(query, filter, 10000);System.out.println("总共有【" + topDocs.totalHits + "】条匹配的结果");// 注意这里的匹配结果是指文档的个数，而不是文档中包含搜索结果的个数// 3、打印结果for (ScoreDoc scoreDoc : topDocs.scoreDocs) {int docSn = scoreDoc.doc;// 文档内部编号Document document = indexSearcher.doc(docSn);// 根据文档编号取出相应的文档File2Document.printDocumentInfo(document);// 打印出文档信息}}public static void main(String[] args) throws Exception {FirstLucene lucene = new FirstLucene();//lucene.createIndex();lucene.search("other");System.out.println("---------------------------");lucene.search("iteye");System.out.println("---------------------------");lucene.search("too");System.out.println("---------------------------");}}

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?File2Document.java:

package com.iflytek.lucene;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStreamReader;import org.apache.lucene.document.Document;import org.apache.lucene.document.Field;import org.apache.lucene.document.Field.Index;import org.apache.lucene.document.Field.Store;/** * @author xudongwang 2012-2-2 *  *         Email:xdwangiflytek@gmail.com */public class File2Document {/** * File--->Document *  * @param filePath *            File路径 *  * @return Document对象 */public static Document file2Document(String filePath) {// 文件要存放：name,content,size,pathFile file = new File(filePath);Document document = new Document();// Store.YES 是否存储 yes no compress(压缩之后再存)// Index 是否进行索引 Index.ANALYZED 分词后进行索引,NOT_ANALYZED 不索引，NOT_ANALYZED// 不分词直接索引document.add(new Field("name", file.getName(), Store.YES,Index.ANALYZED));document.add(new Field("content", readFileContent(file), Store.YES,Index.ANALYZED));document.add(new Field("size", String.valueOf(file.length()),Store.YES, Index.NOT_ANALYZED));// 不分词,但是有时需要索引,文件大小(int)转换成Stringdocument.add(new Field("path", file.getAbsolutePath(), Store.YES,Index.NOT_ANALYZED));// 不需要根据文件的路径来查询return document;}/** * 读取文件内容 *  * @param file *            File对象 * @return File的内容 */private static String readFileContent(File file) {try {BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file)));StringBuffer content = new StringBuffer();try {for (String line = null; (line = reader.readLine()) != null;) {content.append(line).append("\n");}} catch (IOException e) {e.printStackTrace();}return content.toString();} catch (FileNotFoundException e) {e.printStackTrace();}return null;}/** * <pre> * 获取name属性值的两种方法   * 1.Filed field = document.getFiled("name");   *         field.stringValue();   * 2.document.get("name"); * </pre> *  * @param document */public static void printDocumentInfo(Document document) {// TODO Auto-generated method stubSystem.out.println("name -->" + document.get("name"));System.out.println("content -->" + document.get("content"));System.out.println("path -->" + document.get("path"));System.out.println("size -->" + document.get("size"));}}

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Hello, my name is wang xudong, I in iteye blog address is xdwangiflytek.iteye.com.

Hello, my name is wang xudong, I in iteye blog address is xdwangiflytek.iteye.com too.

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