lucene 4.0学习

Posted 2020-08-07 否定之否定

一：官方文件

　　http://lucene.apache.org/core/4_0_0/

　　ps：网上参考文章：http://www.cnblogs.com/xing901022/p/3933675.html

二：jar包

（1）lucene-core-4.0.0.jar

（2）lucene-analyzers-common-4.0.0.jar

（3）lucene-analyzers-smartcn-4.0.0.jar

（4）lucene-queries-4.0.0.jar

（5）lucene-queryparser-4.0.0.jar

（6）jxl.jar

（7）spring相关jar包

（8）poi包

注：目前最新的lucene6.2需要jdk1.8，貌似是myeclipse8.5不兼容jdk1.8，导致出错，所以还是选用了jdk1.6+lucene4.0

三：例子

package demo;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.TextField;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.usermodel.Range;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author xinghl
 *
 */
@Controller
@RequestMapping("/luceneController")
public class luceneController{
    private static String content="";
    
    private static String INDEX_DIR = "D:\\\\luceneIndex";
    private static String DATA_DIR = "D:\\\\luceneData";
    private static Analyzer analyzer = null;
    private static Directory directory = null;
    private static IndexWriter indexWriter = null;
    
  
     * 创建当前文件目录的索引
     * @param path 当前文件目录
     * @return 是否成功
     */
    @SuppressWarnings({ "deprecation" })
    public static boolean createIndex(String path){
        Date date1 = new Date();
        List<File> fileList = getFileList(path);
        for (File file : fileList) {
            content = "";
            //获取文件后缀
            String type = file.getName().substring(file.getName().lastIndexOf(".")+1);
            if("txt".equalsIgnoreCase(type)){
                
                content += txt2String(file);
            
            }else if("doc".equalsIgnoreCase(type)){
            
                content += doc2String(file);
            
            }else if("xls".equalsIgnoreCase(type)){
                
                content += xls2String(file);
                
            }
            
            System.out.println("name :"+file.getName());
            System.out.println("path :"+file.getPath());
            System.out.println();
            
            
            try{
                analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
                directory = FSDirectory.open(new File(INDEX_DIR));
    
                File indexFile = new File(INDEX_DIR);
                if (!indexFile.exists()) {
                    indexFile.mkdirs();
                }
                IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_CURRENT, analyzer);
                indexWriter = new IndexWriter(directory, config);
                
                Document document = new Document();
                document.add(new TextField("filename", file.getName(), Store.YES));
                document.add(new TextField("content", content, Store.YES));
                document.add(new TextField("path", file.getPath(), Store.YES));
                indexWriter.addDocument(document);
                indexWriter.commit();
                closeWriter();
    
                
            }catch(Exception e){
                e.printStackTrace();
            }
            content = "";
        }
        Date date2 = new Date();
        System.out.println("创建索引-----耗时：" + (date2.getTime() - date1.getTime()) + "ms\\n");
        return true;
    }
    
    /**
     * 读取txt文件的内容
     * @param file 想要读取的文件对象
     * @return 返回文件内容
     */
    public static String txt2String(File file){
        String result = "";
        try{
            BufferedReader br = new BufferedReader(new FileReader(file));//构造一个BufferedReader类来读取文件
            String s = null;
            while((s = br.readLine())!=null){//使用readLine方法，一次读一行
                result = result + "\\n" +s;
            }
            br.close();    
        }catch(Exception e){
            e.printStackTrace();
        }
        return result;
    }
    
    /**
     * 读取doc文件内容
     * @param file 想要读取的文件对象
     * @return 返回文件内容
     */
    public static String doc2String(File file){
        String result = "";
        try{
            FileInputStream fis = new FileInputStream(file);
            HWPFDocument doc = new HWPFDocument(fis);
            Range rang = doc.getRange();
            result += rang.text();
            fis.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        return result;
    }
    
    /**
     * 读取xls文件内容
     * @param file 想要读取的文件对象
     * @return 返回文件内容
     */
    public static String xls2String(File file){
        String result = "";
        try{
            FileInputStream fis = new FileInputStream(file);   
            StringBuilder sb = new StringBuilder();   
            jxl.Workbook rwb = Workbook.getWorkbook(fis);   
            Sheet[] sheet = rwb.getSheets();   
            for (int i = 0; i < sheet.length; i++) {   
                Sheet rs = rwb.getSheet(i);   
                for (int j = 0; j < rs.getRows(); j++) {   
                   Cell[] cells = rs.getRow(j);   
                   for(int k=0;k<cells.length;k++)   
                   sb.append(cells[k].getContents());   
                }   
            }   
            fis.close();   
            result += sb.toString();
        }catch(Exception e){
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 查找索引，返回符合条件的文件
     * @param text 查找的字符串
     * @return 符合条件的文件List
     */
    public static void searchIndex(String text){
        Date date1 = new Date();
        try{
            directory = FSDirectory.open(new File(INDEX_DIR));
            analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
            DirectoryReader ireader = DirectoryReader.open(directory); //DATA_DIR目录下为空时，这里会报异常并被捕获
            IndexSearcher isearcher = new IndexSearcher(ireader);
    
            QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "content", analyzer);
            Query query = parser.parse(text);
            
            ScoreDoc[] hits = isearcher.search(query, null, 1000).scoreDocs;
        
            for (int i = 0; i < hits.length; i++) {
                Document hitDoc = isearcher.doc(hits[i].doc);
                System.out.println("____________________________");
                System.out.println(hitDoc.get("filename"));
                System.out.println(hitDoc.get("content"));
                System.out.println(hitDoc.get("path"));
                System.out.println("____________________________");
            }
            ireader.close();
            directory.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        Date date2 = new Date();
        System.out.println("查看索引-----耗时：" + (date2.getTime() - date1.getTime()) + "ms\\n");
    }
    /**
     * 过滤目录下的文件
     * @param dirPath 想要获取文件的目录
     * @return 返回文件list
     */
    public static List<File> getFileList(String dirPath) {
        File[] files = new File(dirPath).listFiles();
        List<File> fileList = new ArrayList<File>();
        for (File file : files) {
            if (isTxtFile(file.getName())) {
                fileList.add(file);
            }
        }
        return fileList;
    }
    /**
     * 判断是否为目标文件，目前支持txt xls doc格式
     * @param fileName 文件名称
     * @return 如果是文件类型满足过滤条件，返回true；否则返回false
     */
    public static boolean isTxtFile(String fileName) {
        if (fileName.lastIndexOf(".txt") > 0) {
            return true;
        }else if (fileName.lastIndexOf(".xls") > 0) {
            return true;
        }else if (fileName.lastIndexOf(".doc") > 0) {
            return true;
        }
        return false;
    }
    
    public static void closeWriter() throws Exception {
        if (indexWriter != null) {
            indexWriter.close();
        }
    }
    /**
     * 删除文件目录下的所有文件
     * @param file 要删除的文件目录
     * @return 如果成功，返回true.
     */
    public static boolean deleteDir(File file){
        if(file.isDirectory()){
            File[] files = file.listFiles();
            for(int i=0; i<files.length; i++){
                deleteDir(files[i]);
            }
        }
        file.delete();
        return true;
    }
    
    @RequestMapping(params="test")
    @ResponseBody
    public String main(String value){   //value为前端传过来的要查询的字符串
        File fileIndex = new File(INDEX_DIR);
        if(deleteDir(fileIndex)){
            fileIndex.mkdir();
        }else{
            fileIndex.mkdir();
        }
        
        createIndex(DATA_DIR);
        searchIndex(value);
        return "success";
    }
}

 四：前端

<body>
     <form id="testform" method="post" action="luceneController.do?test">
        <button id="one">点我开始测试</button>
        <input type="text" name="value"/>
    </form>
  </body>
  <script type="text/javascript">
 　　 $("#one").live("click",function(){
     　　 $("#testform").submit();
 　　 });
  </script>