【Lucene3.6.2入门系列】第10节_Tika

完整版见https://jadyer.github.io/2013/08/19/lucene-tika/

首先贴出来的是演示了借助Tika创建索引的HelloTikaIndex.java

PS：关于Tika的介绍及用法，详见下方的HelloTika.java

package com.jadyer.lucene;import java.io.File;import java.io.IOException;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.index.IndexWriterConfig;import org.apache.lucene.index.Term;import org.apache.lucene.search.IndexSearcher;import org.apache.lucene.search.Query;import org.apache.lucene.search.ScoreDoc;import org.apache.lucene.search.TermQuery;import org.apache.lucene.search.TopDocs;import org.apache.lucene.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.util.Version;import org.apache.tika.Tika;import com.chenlb.mmseg4j.analysis.ComplexAnalyzer;/** * 【Lucene3.6.2入门系列】第10节_Tika * @create Aug 19, 2013 11:02:21 PM * @author 玄玉<http://blog.csdn.net/jadyer> */public class HelloTikaIndex {private Directory directory;private IndexReader reader;public HelloTikaIndex(){try {directory = FSDirectory.open(new File("myExample/myIndex/"));} catch (IOException e) {e.printStackTrace();}}/** * 创建索引 */public void createIndex(){Document doc = null;IndexWriter writer = null;File myFile = new File("myExample/myFile/");try{//这里的分词器使用的是MMSeg4j(记得引入mmseg4j-all-1.8.5-with-dic.jar)//详见http://blog.csdn.net/jadyer/article/details/10049525中对MMSeg4j的介绍writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_36, new ComplexAnalyzer()));writer.deleteAll();for(File file : myFile.listFiles()){doc = new Document();////当保存文件的Metadata时,要过滤掉文件夹,否则会报告文件夹无法访问的异常//if(file.isDirectory()){//continue;//}//Metadata metadata = new Metadata();//doc.add(new Field("filecontent", new Tika().parse(new FileInputStream(file), metadata)));doc.add(new Field("filecontent", new Tika().parse(file)));doc.add(new Field("filename", file.getName(), Field.Store.YES, Field.Index.NOT_ANALYZED));writer.addDocument(doc);}}catch(Exception e) {e.printStackTrace();}finally{if(null != writer){try {writer.close();} catch (IOException ce) {ce.printStackTrace();}}}}/** * 获取IndexSearcher实例 */private IndexSearcher getIndexSearcher(){try {if(reader == null){reader = IndexReader.open(directory);}else{//if the index was changed since the provided reader was opened, open and return a new reader; else,return null//如果当前reader在打开期间index发生改变,则打开并返回一个新的IndexReader,否则返回nullIndexReader ir = IndexReader.openIfChanged(reader);if(ir != null){reader.close(); //关闭原readerreader = ir;    //赋予新reader}}return new IndexSearcher(reader);}catch(Exception e) {e.printStackTrace();}return null; //发生异常则返回null}/** * 执行搜索操作 * @param fieldName 域名(相当于表的字段名) * @param keyWords  搜索的关键字 */public void searchFile(String fieldName, String keyWords){IndexSearcher searcher = this.getIndexSearcher();Query query = new TermQuery(new Term(fieldName, keyWords));try {TopDocs tds = searcher.search(query, 50);for(ScoreDoc sd : tds.scoreDocs){Document doc = searcher.doc(sd.doc);System.out.print("文档编号=" + sd.doc + "  文档权值=" + doc.getBoost() + "  文档评分=" + sd.score + "    ");System.out.println("filename=" + doc.get("filename"));}} catch (IOException e) {e.printStackTrace();} finally {if(null != searcher){try {searcher.close(); //记得关闭IndexSearcher} catch (IOException e) {e.printStackTrace();}}}}/** * 测试一下效果 * @see 测试前记得在myExample/myFile/目录下预先准备几个doc,pdf,html,txt等文件 */public static void main(String[] args) {HelloTikaIndex hello = new HelloTikaIndex();hello.createIndex();hello.searchFile("filecontent", "java");}}

下面是描述Tika的介绍和用法的HelloTika.java

package com.jadyer.lucene;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import org.apache.tika.Tika;import org.apache.tika.metadata.Metadata;import org.apache.tika.parser.AutoDetectParser;import org.apache.tika.parser.ParseContext;import org.apache.tika.parser.Parser;import org.apache.tika.sax.BodyContentHandler;import org.xml.sax.ContentHandler;/** * Tika * @see 官网:http://tika.apache.org/ * @see 用途:打开各种不同的文档,包括PDF、Office、html、txt等等 * @see     以往解析PDF时通常使用PDFBox(http://pdfbox.apache.org/),解析Office时使用POI(http://poi.apache.org/) * @see     而Tika则是对它们的封装,使用Tika的API可以直接将PDF,Office等文件解析为文本字符串 * @see 用法:1)双击tika-app-1.4.jar竟然打不开,通过命令行[java -jar tika-app-1.4.jar]则可以打开 * @see     2)在项目中使用时,直接将tika-app-1.4.jar引入即可 * @create Aug 7, 2013 8:57:49 AM * @author 玄玉<http://blog.csdn.net/jadyer> */public class HelloTika {public static String parseToStringByTikaParser(File file){//创建解析器,使用AutoDetectParser可以自动检测一个最合适的解析器Parser parser = new AutoDetectParser();//指定解析文件中的文档内容ContentHandler handler = new BodyContentHandler();//指定元数据存放位置,并自己添加一些元数据Metadata metadata = new Metadata(); metadata.set("MyAddPropertyName", "我叫玄玉");metadata.set(Metadata.RESOURCE_NAME_KEY, file.getAbsolutePath());//指定最基本的变量信息(即存放一个所使用的解析器对象)ParseContext context = new ParseContext();context.set(Parser.class, parser);InputStream is = null;try {is = new FileInputStream(file);//InputStream-----指定文件输入流//ContentHandler--指定要解析文件的哪一个内容,它有一个实现类叫做BodyContentHandler,即专门用来解析文档内容的//Metadata--------指定解析文件时,存放解析出来的元数据的Metadata对象//ParseContext----该对象用于存放一些变量信息,该对象最少也要存放所使用的解析器对象,这也是其存放的最基本的变量信息parser.parse(is, handler, metadata, context);//打印元数据for(String name : metadata.names()){System.out.println(name + "=" + metadata.get(name));}//返回解析到的文档内容return handler.toString();} catch (Exception e) {e.printStackTrace();} finally {if(is != null){try {is.close();} catch (IOException e) {e.printStackTrace();}}}return null;}public static String parseToStringByTika(File file){//据Tika文档上说,org.apache.tika.Tika的效率没有org.apache.tika.parser.Parser的高Tika tika = new Tika();//可以指定是否获取元数据,也可自己添加元数据Metadata metadata = new Metadata(); metadata.set("MyAddPropertyName", "我叫玄玉");metadata.set(Metadata.RESOURCE_NAME_KEY, file.getAbsolutePath());try {String fileContent = tika.parseToString(file);//String fileContent = tika.parseToString(new FileInputStream(file), metadata);//打印元数据for(String name : metadata.names()){System.out.println(name + "=" + metadata.get(name));}return fileContent;} catch (Exception e) {e.printStackTrace();}return null;}/** * 小测试一下 */public static void main(String[] args) {System.out.println(parseToStringByTikaParser(new File("myExample/myFile/Java安全.doc")));System.out.println(parseToStringByTika(new File("myExample/myFile/Oracle_SQL语句优化.pdf")));System.out.println(parseToStringByTika(new File("myExample/myFile/")));}}