我使用以下代码取出检索结果的片段。下面显示的错误来自使用getBestFragment（）函数的行。我正在使用Apache Tomcat 7.0。请帮忙。
public JSONArray search(String indexDir,String scoring,boolean stemming) throws IOException, ParseException{
searcher = new Searcher(indexDir,scoring,stemming);
long startTime = System.currentTimeMillis();
TopDocs hits = searcher.search(query);
long endTime = System.currentTimeMillis();
JSONArray searchResultArray = new JSONArray();
StandardAnalyzer analyzer = new StandardAnalyzer();
int maxNumFragmentsRequired = 1;
QueryParser queryParser=new QueryParser(LuceneConstants.CONTENTS,analyzer);
QueryScorer scorer = new QueryScorer(queryParser.parse(query));
org.apache.lucene.search.highlight.Highlighter highlighter = new org.apache.lucene.search.highlight.Highlighter(scorer);
for(ScoreDoc scoreDoc : hits.scoreDocs) {
JSONObject searchResultObject = new JSONObject();
Document doc = searcher.getDocument(scoreDoc);
StandardAnalyzer analyzer2 = new StandardAnalyzer();
String text = doc.get(LuceneConstants.CONTENTS);
System.out.println("dfsdfsdfsdferer "+ text);
TokenStream tokenStream = analyzer2.tokenStream(LuceneConstants.CONTENTS,new StringReader(text));
highlighter.setTextFragmenter(new SimpleFragmenter(40));
String result = "";
try {
//result = highlighter.getBestFragments(tokenStream, text, maxNumFragmentsRequired,"...");
result = highlighter.getBestFragment(analyzer2, LuceneConstants.CONTENTS, text);
}
catch(Exception e)
{
e.printStackTrace();
result = "Oh Snap!!";
}
}
错误是
Sep 03, 2015 8:53:55 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [com.eniac.searchEngine.Search] in context with path [/Assignment1] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: org.apache.lucene.index.memory.MemoryIndex
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
at org.apache.lucene.search.highlight.WeightedSpanTermExtractor.getLeafContext(WeightedSpanTermExtractor.java:391)
at org.apache.lucene.search.highlight.WeightedSpanTermExtractor.extractWeightedTerms(WeightedSpanTermExtractor.java:355)
at org.apache.lucene.search.highlight.WeightedSpanTermExtractor.extract(WeightedSpanTermExtractor.java:150)
at org.apache.lucene.search.highlight.WeightedSpanTermExtractor.getWeightedSpanTerms(WeightedSpanTermExtractor.java:518)
at org.apache.lucene.search.highlight.QueryScorer.initExtractor(QueryScorer.java:219)
at org.apache.lucene.search.highlight.QueryScorer.init(QueryScorer.java:187)
at org.apache.lucene.search.highlight.Highlighter.getBestTextFragments(Highlighter.java:196)
at org.apache.lucene.search.highlight.Highlighter.getBestFragments(Highlighter.java:156)
at org.apache.lucene.search.highlight.Highlighter.getBestFragment(Highlighter.java:102)
at org.apache.lucene.search.highlight.Highlighter.getBestFragment(Highlighter.java:80)
at com.eniac.sen.LuceneTester.search(LuceneTester.java:139)
at com.eniac.searchEngine.Search.doGet(Search.java:103)
at com.eniac.searchEngine.Search.doPost(Search.java:125)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)