代码示例：Lucene Highlighter
这里用的是FastVectorHighlighter，可以高效地对付大文件

<!--pom.xml--><dependency><groupId>org.apache.lucene</groupId><artifactId>lucene-fast-vector-highlighter</artifactId><version>3.0.0</version></dependency>

package player.kent.chen.temp.lucene.highlight;import java.io.File;import org.apache.commons.io.FileUtils;import org.apache.lucene.analysis.standard.StandardAnalyzer;import org.apache.lucene.document.Document;import org.apache.lucene.document.Field;import org.apache.lucene.document.Field.Index;import org.apache.lucene.document.Field.Store;import org.apache.lucene.document.Field.TermVector;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.util.Version;public class MyHighlightIndexer {    public static void main(String[] args) throws Exception {        String rootDir = "/home/kent/diskD/home-kent-dev/workspace/kent-temp/data/lucene-sanguo";        File contentDir = new File(rootDir, "content");        File indexDir = new File(rootDir, "index");        FileUtils.deleteDirectory(indexDir);        indexDir.mkdirs();        Directory indexDir1 = FSDirectory.open(indexDir);        IndexWriter writer = new IndexWriter(indexDir1, new StandardAnalyzer(Version.LUCENE_30),                true, IndexWriter.MaxFieldLength.UNLIMITED);        File[] files = contentDir.listFiles();        for (File file : files) {            System.out.println("Indexing ... " + file.getAbsolutePath());            String text = FileUtils.readFileToString(file, "UTF-8");            Document doc = new Document();            doc.add(new Field("contents", text, Store.YES, Index.ANALYZED,                    TermVector.WITH_POSITIONS_OFFSETS));            writer.addDocument(doc);        }        writer.numDocs();        writer.close();    }}

package player.kent.chen.temp.lucene.highlight;import java.io.File;import org.apache.lucene.analysis.standard.StandardAnalyzer;import org.apache.lucene.queryParser.QueryParser;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.search.vectorhighlight.FastVectorHighlighter;import org.apache.lucene.search.vectorhighlight.FieldQuery;import org.apache.lucene.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.util.Version;public class MyHighlighter {    public static void main(String[] args) throws Exception {        String rootDir = "/home/kent/diskD/home-kent-dev/workspace/kent-temp/data/lucene-sanguo";        File id = new File(rootDir, "index");        String keyword = "heed";        Directory indexDir = FSDirectory.open(id);        IndexSearcher searcher = new IndexSearcher(indexDir);        QueryParser qp = new QueryParser(Version.LUCENE_30, "contents", new StandardAnalyzer(                Version.LUCENE_30));        Query query = qp.parse(keyword);        TopDocs hits = searcher.search(query, 10);        FastVectorHighlighter highlighter = new FastVectorHighlighter(true, true);        FieldQuery fieldQuery = highlighter.getFieldQuery(query);        for (ScoreDoc scoreDoc : hits.scoreDocs) {            String snippet = highlighter.getBestFragment(fieldQuery, searcher.getIndexReader(),                    scoreDoc.doc, "contents", 200);            System.out.println(snippet);        }        searcher.close();    }}