Lucene关键字高亮显示

package searchfileexample;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.io.IOException;
import java.io.StringReader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.SimpleFragmenter;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
import org.apache.lucene.analysis.standard.StandardAnalyzer;

public class MyHighLighterServlet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GB18030";

private String indexPath = "C:\\index";
private Analyzer analyzer;
private IndexSearcher searcher;

//Initialize global variables
public void init() throws ServletException {
    analyzer = new StandardAnalyzer();
}
public void createIndex() throws IOException {   // 该方法建立索引
       IndexWriter writer = new IndexWriter(indexPath,analyzer,true);
       Document docA = new Document();
       String fileTextA = "因为火烧云总是燃烧着消失在太阳冲下地平线的时刻，然后便是宁静的自然的天籁，没有谁会在这样的时光的镜片里伤感自语，因为灿烂给人以安静的舒适感。";
       Field fieldA = new Field("contents", fileTextA, Field.Store.YES,Field.Index.TOKENIZED);
       docA.add(fieldA);

       Document docB = new Document();
       String fileTextB = "因为带有以伤痕为代价的美丽风景总是让人不由地惴惴不安，紧接着袭面而来的抑或是病痛抑或是灾难，没有谁会能够安逸着恬然，因为模糊让人撕心裂肺地想呐喊。";
       Field fieldB = new Field("contents", fileTextB, Field.Store.YES,Field.Index.TOKENIZED);
       docB.add(fieldB);

       Document docC = new Document();
       String fileTextC = "我喜欢上了一个人孤独地行游，在梦与海洋的交接地带炽烈燃烧着。"+
       "因为，一条孤独的鱼喜欢上了火焰的颜色，真是荒唐地不合逻辑,原因。";
       Field fieldC = new Field("contents", fileTextC, Field.Store.YES,Field.Index.TOKENIZED);
       docC.add(fieldC);

       writer.addDocument(docA);
       writer.addDocument(docB);
       writer.addDocument(docC);
       writer.optimize();
       writer.close();
    }

    public void search(String fieldName,String keyword,PrintWriter out) throws CorruptIndexException, IOException, ParseException{   // 检索的方法，并实现高亮显示
       searcher = new IndexSearcher(indexPath);
       QueryParser queryParse = new QueryParser(fieldName, analyzer);     //   构造QueryParser，解析用户输入的检索关键字
       Query query = queryParse.parse(keyword);
       Hits hits = searcher.search(query);
       for(int i=0;i<hits.length();i++){
        Document doc = hits.doc(i);
        String text = doc.get(fieldName);
        SimpleHTMLFormatter simpleHTMLFormatter = new SimpleHTMLFormatter("<font color='red'>", "</font>");
                Highlighter highlighter = new Highlighter(simpleHTMLFormatter,new QueryScorer(query));
                highlighter.setTextFragmenter(new SimpleFragmenter(text.length()));
                if (text != null) {
                    TokenStream tokenStream = analyzer.tokenStream(fieldName,new StringReader(text));
                    String highLightText = highlighter.getBestFragment(tokenStream, text);
                    System.out.println("★高亮显示第 "+(i+1) +" 条检索结果如下所示：");
                    out.println(highLightText);
                }
       }
       searcher.close();
    }

//Process the HTTP Get request
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType(CONTENT_TYPE);
    PrintWriter out = response.getWriter();
    out.println("<html>");
    out.println("<head><title>MyHighLighterServlet</title></head>");
    out.println("<body bgcolor=\"#ffffff\">");

     try {
      createIndex();
      search("contents", "因为",out);
     } catch (CorruptIndexException e) {
      e.printStackTrace();
     } catch (IOException e) {
      e.printStackTrace();
     } catch (ParseException e) {
      e.printStackTrace();
     }

    out.println("</body></html>");
}

//Clean up resources
public void destroy() {
}
}

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