Lucene5.5学习(9)-使用searchafter方法实现分页查询

/**
 * Created by 小陈 on 2016/3/25.
 */
public class IndexerPaging {
    //测试数据，模拟数据库表结构
    private static String[] ids={"1","2","3","4","5","6"}; //用户ID
    private static String [] names={"kl","kl","kl","kl","kl","fds"};
    private static String [] describes={"shi yi ge mei nan zi","Don't know","Is an idiot\n","Is an idiot\n","Is an idiot\n","Is an idiot\n"};
    //索引存储地址
    private static String indexDir="E:\\javaEEworkspace\\LuceneDemo\\LuceneIndex";

    /**
     * 获取操作索引实体,并添加测试数据
     * @param indexDir 索引存储位置
     * @return
     * @throws Exception
     */
    public static void getIndexWriter(String indexDir)throws Exception{
        IndexWriterConfig writerConfig=new IndexWriterConfig(getAnalyzer());
        IndexWriter indexWriter=new IndexWriter(FSDirectory.open(Paths.get(indexDir)),writerConfig);
        Document document=new Document();
        //Field.Store.YES或者NO(存储域选项)
        //设置为YES表示或把这个域中的内容完全存储到文件中，方便进行文本的还原
        //设置为NO表示把这个域的内容不存储到文件中，但是可以被索引，此时内容无法完全还原(doc.get)
        for(int i=0;i1){
                 int pageIndexLast=(pageIndex-1)*pageSize-1;
                 TopDocs hits=searcher.search(query,pageIndexLast);
                 if(hits.totalHits>=pageIndexLast)
                     return hits.scoreDocs[pageIndexLast];

             }
             return null;
    }

    public static void searcher(String indexDir,String q,int pageIndex,int pageSize)throws Exception{
        Directory directory= FSDirectory.open(Paths.get(indexDir));
        IndexReader reader= DirectoryReader.open(directory);
        IndexSearcher indexSearcher=new IndexSearcher(reader);
        QueryParser queryParser=new QueryParser("names",new StandardAnalyzer());
        Query query=queryParser.parse(q);
        //分页查询
        TopDocs hits=  indexSearcher.searchAfter(getPageLastScoreDoc(pageIndex,pageSize,query,indexSearcher),query,pageSize);//查询首次的30条
        System.out.println("匹配 "+q+"查询到"+hits.totalHits+"个记录");
        for (ScoreDoc scoreDoc:hits.scoreDocs){
            Document doc=indexSearcher.doc(scoreDoc.doc);
            System.out.println(doc.get("describes"));//打印Document的fileName属性
        }
        reader.close();
        directory.close();//关闭连接
    }
    /**
     * 得到默认分词器
     * @return
     */
    public static Analyzer getAnalyzer(){
        return new StandardAnalyzer();
    }

    @Test
    public void  Test()throws Exception{
//     getIndexWriter(indexDir);
        searcher(indexDir,"kl",1,10);//查询测试
    }

}