第六步：Lucene查询索引

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package cn.harmel.lucene;   import java.io.IOException; import java.nio.file.Paths;   import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.index.DirectoryReader; import org.apache.lucene.index.IndexReader; import org.apache.lucene.queryparser.classic.ParseException; import org.apache.lucene.queryparser.classic.QueryParser; import org.apache.lucene.queryparser.classic.QueryParser.Operator; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query; import org.apache.lucene.search.ScoreDoc; import org.apache.lucene.search.Sort; import org.apache.lucene.search.SortField; import org.apache.lucene.search.SortField.Type; import org.apache.lucene.search.TopDocs; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory;   public class SearchIndex {     public static void main(String[] args) throws IOException, ParseException {             /*---------------------------------------------------------------------------------          * String queryString="title:\"美国\"";//包含“美国”          * String queryString="NOT title:\"美国\" AND title:\"国\"";//不包含 “美国” 但是包含 “国”          * String queryString="title:\"中\" AND title:\"国人\"";//即包含 “中” 又包含 ”国人“          * String queryString="title:\"张三\" OR title:\"李四\"";//包含 “张三” 或 ”李四“          * String queryString="id:[1 TO 5]";//查询 1<=id<=5          * String queryString="id:{1 TO 5}";//查询 1<id<5          * String queryString="title:\"中国\" AND NOT title:\"张三\" AND id:[1 TO 5]";          * String queryString="title:(中国 张三)";即包含 “中国” 又包含 ”张三“          ---------------------------------------------------------------------------------*/         String queryString="title:\"中国\"";                   Analyzer analyzer = new StandardAnalyzer();  //StandardAnalyzer:汉字一个一个字拆分索引         Directory dir = FSDirectory.open(Paths.get("E:\\LuceneIndex")); //获取索引存储的位置         IndexReader reader = DirectoryReader.open(dir);         IndexSearcher is = new IndexSearcher(reader);         QueryParser parser=new QueryParser("", analyzer);         parser.setDefaultOperator(Operator.AND);//默认状态下，空格被认为是OR的关系，设置为空格为AND         Query query = parser.parse(queryString);         //排序         Sort sort = new Sort(new SortField("dt", Type.LONG, true));         TopDocs topDocs = is.search(query, 20,sort);         System.out.println("总共匹配多少个：" + topDocs.totalHits);         //获取查询结果集         ScoreDoc[] hits = topDocs.scoreDocs;         //遍历结果集         for (ScoreDoc scoreDoc : hits) {             //System.out.println("匹配得分：" + scoreDoc.score);             //System.out.println("文档索引ID：" + scoreDoc.doc);             Document document = is.doc(scoreDoc.doc);             System.out.println(document.get("id")+"-"+document.get("name")+"-"+document.get("dt")+"-"+document.get("title"));         }         reader.close();         dir.close();            } }