📄 search.jhtml
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<HTML><!-- -*-java-*- --><!-- Lucene Search Demo via CompiledPageServlet --><!-- Copyright (c) 1998,2000 Douglass R. Cutting. --><java type=import> javax.servlet.* javax.servlet.http.* java.io.* org.apache.lucene.analysis.* org.apache.lucene.document.* org.apache.lucene.index.* org.apache.lucene.search.* org.apache.lucene.queryParser.* org.apache.lucene.demo.* org.apache.lucene.demo.html.Entities</java><java> // get index from request String indexName = request.getParameter("index"); if (indexName == null) // default to "index" indexName = "index"; Searcher searcher = // make searcher new IndexSearcher(getReader(indexName)); // get query from request String queryString = request.getParameter("query"); if (queryString == null) throw new ServletException("no query specified"); int start = 0; // first hit to display String startString = request.getParameter("start"); if (startString != null) start = Integer.parseInt(startString); int hitsPerPage = 10; // number of hits to display String hitsString = request.getParameter("hitsPerPage"); if (hitsString != null) hitsPerPage = Integer.parseInt(hitsString); boolean showSummaries = true; // show summaries? if ("false".equals(request.getParameter("showSummaries"))) showSummaries = false; Query query = null; try { // parse query query = QueryParser.parse(queryString, "contents", analyzer); } catch (ParseException e) { // error parsing query </java> <HEAD><TITLE>Error Parsing Query</TITLE></HEAD><BODY> <p>While parsing `queryString`: `e.getMessage()` <java> return; } String servletPath = request.getRequestURI(); // getServletPath should work int j = servletPath.indexOf('?'); // here but doesn't, so we if (j != -1) // remove query by hand... servletPath = servletPath.substring(0, j);</java><head><title>Lucene Search Results</title></head><body><center> <form name=search action=`servletPath` method=get> <input name=query size=44 value='`queryString`'> <input type=hidden name=index value="`indexName`"> <input type=hidden name=hitsPerPage value=`hitsPerPage`> <input type=hidden name=showSummaries value=`showSummaries`> <input type=submit value=Search> </form></center><java> Hits hits = searcher.search(query); // perform query int end = Math.min(hits.length(), start + hitsPerPage);</java><p>Hits <b><java type=print>start+1</java>-<java type=print>end</java></b>(out of <java type=print>hits.length()</java> total matching documents):<ul><java> for (int i = start; i < end; i++) { // display the hits Document doc = hits.doc(i); String title = doc.get("title"); if (title.equals("")) // use url for docs w/o title title = doc.get("url"); </java> <p><b><java type=print>(int)(hits.score(i) * 100.0f)</java>% <a href="`doc.get("url")`"> <java type=print>Entities.encode(title)</java> </b></a> <java> if (showSummaries) { // maybe show summary </java> <ul><i>Summary</i>: <java type=print>Entities.encode(doc.get("summary"))</java> </ul> <java> } }</java></ul><java> if (end < hits.length()) { // insert next page button</java> <center> <form name=search action=`servletPath` method=get> <input type=hidden name=query value='`queryString`'> <input type=hidden name=start value=`end`> <input type=hidden name=index value="`indexName`"> <input type=hidden name=hitsPerPage value=`hitsPerPage`> <input type=hidden name=showSummaries value=`showSummaries`> <input type=submit value=Next> </form> </center><java> }</java></body><java type=class> Analyzer analyzer = new StopAnalyzer(); // used to tokenize queries /** Keep a cache of open IndexReader's, so that an index does not have to opened for each query. The cache re-opens an index when it has changed so that additions and deletions are visible ASAP. */ static Hashtable indexCache = new Hashtable(); // name->CachedIndex class CachedIndex { // an entry in the cache IndexReader reader; // an open reader long modified; // reader's modified date CachedIndex(String name) throws IOException { modified = IndexReader.lastModified(name); // get modified date reader = IndexReader.open(name); // open reader } } IndexReader getReader(String name) throws ServletException { CachedIndex index = // look in cache (CachedIndex)indexCache.get(name); try { if (index != null && // check up-to-date (index.modified == IndexReader.lastModified(name))) return index.reader; // cache hit else { index = new CachedIndex(name); // cache miss } } catch (IOException e) { StringWriter writer = new StringWriter(); PrintWriter pw = new PrintWriter(writer); throw new ServletException("Could not open index " + name + ": " + e.getClass().getName() + "--" + e.getMessage()); } indexCache.put(name, index); // add to cache return index.reader; }</java>⌨️ 快捷键说明
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