• Lucene建索引代码


    Lucene 是apache软件基金会一个开放源代码的全文检索引擎工具包,是一个全文检索引擎的架构,提供了完整的查询引擎和索引引擎,部分文本分析引擎。 Lucene的目的是为软件开发人员提供一个简单易用的工具包,以方便的在目标系统中实现全文检索的功能,或者是以此为基础建立起完整的全文检索引擎。

    下载地址:
    http://www.apache.org/dyn/closer.cgi/lucene/java/4.10.1

    1.建立lucene索引模块示例

    package luceneL;
    
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    
    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.CorruptIndexException;
    import org.apache.lucene.index.IndexWriter;
    import org.apache.lucene.index.IndexWriterConfig;
    import org.apache.lucene.store.Directory;
    import org.apache.lucene.store.FSDirectory;
    import org.apache.lucene.util.Version;
    
    public class Index {
     
    	public static void main(String[] args) throws Exception {
    // 
    		  
    		String str1 = "e:/luc2";
    		String str2 = "e:/q";
    //		String str1 = args[0];
    //		String str2 = args[1];
    		Index in = new Index();
    		in.index(str1, str2);
    	}
    	public void index(String str1, String str2) throws Exception{
    	    IndexWriter writer = null;
    	    try {
    	      // (1)创建Directory new RAMDirectory();建立在内存中
    	      // Directory directory = new RAMDirectory();
    	      Directory directory = FSDirectory.open(new File(str1));
    	      // (2)创建IndexWriter,通过它来写索引
    	      IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_4_9, new StandardAnalyzer(Version.LUCENE_4_9));
    	      
    	      iwc.setUseCompoundFile(false);
    	      writer = new IndexWriter(directory, iwc);
    	      // (3)创建Document对象,大小,路径、内容等信息作为Field存在在Document里面
    	      Document document = null;
    	      // (4)为Document文档添加Field
    	      List<String> list = new ArrayList<String>();
    	      File f = new File(str2);
    	      long startTime=new Date().getTime();
    	      
    	      for(File file : f.listFiles()){
    	    	System.out.println("开始建立索引,请稍等");
    	        
    	        // 先存储路径、名字、内容
    	        list=getContent(file);
    	        System.out.println("文件有"+list.size()+"条数据");
    	        for(int i=0;i<list.size();i++){
    	        	
    		        String[] con=list.get(i).split("01");
    		        document = new Document();
    		        //System.out.println(co1.get(i));
    		
    		        for(int j=0;j<con.length;j++){
    		        	    document.add(new TextField("c"+j, con[j],Field.Store.YES));
    		        }
    		     
    		        // Field.Store.YES是否把这个文件的全名存储到硬盘中
    		        // Field.Index.NOT_ANALYZED没有必要分词
    		        document.add(new StringField("file_name", file.getName(), Field.Store.YES));
    		        document.add(new StringField("path", file.getAbsolutePath(), Field.Store.YES));
    		        // (5)通过IndexWriter添加文档到索引中
    		        writer.addDocument(document);
    		      
    		        con =null;
    		       
    	        }
    	        list.clear();
    	      } 
    	        long endTime=new Date().getTime();
    			System.out.println("共花了"+(endTime-startTime)+"毫秒将文档增加到索引中"+str1);
    
    	    } catch (IOException e) {
    	      e.printStackTrace();
    	    }finally{
    	      if(writer!=null){
    	        try {
    	        	
    	          writer.close();	          
    	        } catch (CorruptIndexException e) {
    	          e.printStackTrace();
    	        } catch (IOException e) {
    	          e.printStackTrace();
    	        }
    	      }
    	    }
    	  }
    	  
    	  /**
    		 * 获取文本内容
    		 */
    	
    		public  List<String> getContent(File file) throws Exception{
    	
    			BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(file),"UTF-8"));
    			//StringBuffer sb=new StringBuffer();
    			String line=br.readLine();
    			List<String> contents = new ArrayList<String>();
    			while(line!=null){	
    				//sb.append(line);
    				contents.add(line);
    				//sb=null;
    				line=br.readLine();
    			}
    			br.close();
    			//return sb.toString();
    			return contents;
    		}
    
    }

     2 检索模块示例

    import java.io.File;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Date;
    import java.util.List;
    
    //import org.apache.lucene.analysis.core.WhitespaceAnalyzer;
    import org.apache.lucene.analysis.standard.StandardAnalyzer;
    import org.apache.lucene.document.Document;
    import org.apache.lucene.index.IndexReader;
    import org.apache.lucene.queryparser.classic.ParseException;
    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;
    import org.apache.lucene.queryparser.classic.QueryParser;
    
    public class Search {
    
    	public static void main(String[] args) throws Exception {
    
    		String str1 = "e:\luc2";
    		String str2 = "mokdis旗舰店";
    		String str3 = "c2";
    		int in4 = 10;
    		// String str1 = args[0];
    		// String str2 = args[1];
    		// String str3 = args[2];
    		// int in4 = Integer.parseInt(args[3]);//检索出多少条数据
    		Search hl = new Search();
    		hl.search(str1, str2, str3, in4);
    	}
    
    	@SuppressWarnings("deprecation")
    	public void search(String str1, String str2, String str3, int in4) {
    
    		Directory directory = null;
    		IndexReader reader = null;
    		long startTime = new Date().getTime();
    		try {
    
    			directory = FSDirectory.open(new File(str1));// (1)创建Directory,要去什么地方搜索
    			reader = IndexReader.open(directory); // (2)创建IndexReader,通过它来读取索引
    			IndexSearcher searcher = new IndexSearcher(reader);// (3)根据IndexReader来创建IndexSearcher
    			// (4)创建搜索的Query,创建parser来确定要搜索文件的内容,创建搜索的域,创建索引时设置的值
    			QueryParser parser = new QueryParser(Version.LUCENE_4_9, str3,
    					new StandardAnalyzer(Version.LUCENE_4_9));
    
    			// QueryParser parser = new QueryParser(Version.LUCENE_4_9, str3,
    			// new WhitespaceAnalyzer(Version.LUCENE_4_9));
    
    			Query query;
    			try {
    				query = parser.parse(str2);
    				TopDocs tds = searcher.search(query, in4); // (5)根据Searcher搜索并返回TopDocs
    				System.out.println("共为您查找到" + tds.totalHits + "条结果");
    				ScoreDoc[] sds = tds.scoreDocs; // (6)根据TopDocs获取ScoreDoc对象//这是获取一个属性
    				long midTime = new Date().getTime();
    				System.out.println("访问索引时间Tindex-1 = " + (midTime - startTime)
    						+ "毫秒");
    				int[] docCount = new int[in4];
    				int i = 0;
    				for (ScoreDoc sd : sds) {
    					docCount[i] = sd.doc;
    					i++;
    					System.out.println("sd.doc " + sd.doc);// (7)根据Searcher和ScoreDoc对象获取具体的Document对象
    					Document document = searcher.doc(sd.doc); // -Xmx
    					// (8)根据Document对象获取需要的值
    					// System.out.println(document.get("c0"));
    					System.out.println(document.get(str3));
    					// System.out.println(document.get("file_name") + "][ "
    					// + document.get("path"));
    					document = null;
    				}
    
    				long endTime = new Date().getTime();
    				System.out.println("访问Lucene数据时间Tlocal = "
    						+ (endTime - midTime) + "毫秒");
    				System.out.println("总检索时间TLucene = " + (endTime - startTime)
    						+ "毫秒");
    				// DocId序列至少涵盖顺序、逆序、随机等情况
    				List<Integer> list = new ArrayList<Integer>();
    
    				for (int j = 0; j < docCount.length; j++) {
    					list.add(docCount[j]);
    				}
    				List<Integer> list1 = new ArrayList<Integer>();// 存原序列
    				List<Integer> list2 = new ArrayList<Integer>();// 存顺序排列
    				List<Integer> list3 = new ArrayList<Integer>();// 存倒序排列
    				list1 = list;// 原序列
    				System.out.println("原序列为:" + list1);
    				Collections.sort(list); // 顺序排列
    				list2 = list;// list2存顺序序列
    				System.out.println("顺序序列为:" + list2);
    				Collections.reverse(list); // 倒序排列
    				list3 = list;// list3存倒序排列
    				System.out.println("倒序序列为:" + list3);
    				Collections.shuffle(list); // 随机排列
    				System.out.println("随机序列为:" + list);// list存随机序列
    			} catch (ParseException e) {
    				e.printStackTrace();
    			}
    		} catch (IOException e) {
    			e.printStackTrace();
    		} finally {
    			// (9)关闭Reader
    			if (reader != null) {
    				try {
    					reader.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    	}
    }
    

      

  • 相关阅读:
    ubuntu16.04添加开机启动任务
    Elasticsearch-5.0.0移植到ubuntu16.04
    转:解决npm install慢的问题
    解决virtualbox装ghost xp装驱动时报portcls.sys蓝屏的问题
    git文件迁移到新架构
    ubuntu16.04文件形式安装mongodb
    linux启动流程
    启动WAMPSERVER出现计算机中丢失 MSVCR110.dll
    socket编程的网络协议
    PHP7的新特性
  • 原文地址:https://www.cnblogs.com/xiaodf/p/5027194.html
Copyright © 2020-2023  润新知