我正在尝试从lucene索引中搜索,但我想过滤此搜索。有两个字段内容和类别.suppose我想搜索有“体育”的文件,我也想计算在a和b类别中的文件数量。我试图通过以下代码实现这一点。但问题是,如果有数百万条记录,那么由于循环执行它会变慢,建议我实现任务的另一种方法。
尝试{File indexDir = new File(“文件的路径”)
Directory directory = FSDirectory.open(indexDir);
IndexSearcher searcher = new IndexSearcher(directory, true);
int maxhits=1000000;
QueryParser parser1 = new QueryParser(Version.LUCENE_36, "contents",
new StandardAnalyzer(Version.LUCENE_36));
Query qu=parser1.parse("sport");
TopDocs topDocs = searcher.search(, maxhits);
ScoreDoc[] hits = topDocs.scoreDocs;
len = hits.length;
JOptionPane.showMessageDialog(null,"found times"+len);
int docId = 0;
Document d;
String category="";
int ctr=0,ctr1=0;
for ( i = 0; i<len; i++) {
docId = hits[i].doc;
d = searcher.doc(docId);
category= d.get(("category"));
if(category.equals("a"))
ctr++;
if(category.equals("b"))
ctr1++;
}
JOptionPane.showMessageDialog("wprd found in category a times"+ctr);
JOptionPane.showMessageDialog("wprd found in category b times"+ctr1);
}
catch(Exception ex)
{
ex.printStackTrace();
}
答案 0 :(得分:1)
您可以只查询您要查找的每个类别,然后获取totalHits
。更好的方法是使用TotalHitCountCollector,而不是获取TopDocs
实例:
Query query = parser1.parser("+sport +category:a")
TotalHitCountCollector collector = new TotalHitCountCollector();
search.search(query, collector);
ctr = collector.getTotalHits();
query = parser1.parser("+sport +category:b")
collector = new TotalHitCountCollector();
search.search(query, collector);
ctr1 = collector.getTotalHits();