lucene中search内置的Filter

来源：互联网

先来看一下RangeFilter：

public static void printFilter(String path)throws IOException
{
Term normal=new Term("securitylevel",SECURITY_NORMAL+"");
Term middle=new Term("securitylevel",SECURITY_MIDDLE+"");
Term advanced=new Term("securitylevel",SECURITY_ADVANCED+"");

BooleanQuery bq=new BooleanQuery();
bq.add(new TermQuery(normal),BooleanClause.Occur.SHOULD);
bq.add(new TermQuery(middle),BooleanClause.Occur.SHOULD);
bq.add(new TermQuery(advanced),BooleanClause.Occur.SHOULD);

IndexSearcher searcher=new IndexSearcher(path);

RangeFilter filter=new RangeFilter("publishdate","1999-01-01","1999-10-10",true,true);

Hits hits=searcher.search(bq,filter);

for(int i=0;i<hits.length();i++)
{
Document doc=hits.doc(i);

System.out.println("书号：");
System.out.println(doc.get("bookNumber"));
System.out.println("书名：");
System.out.println(doc.get("bookname"));
System.out.println("出版日期：");
System.out.println(doc.get("publishdate"));
System.out.println("安全级别");
int level=Integer.parseInt(doc.get("securitylevel"));
switch(level)
{
case SECURITY_ADVANCED:
System.out.println("高级");
break;
case SECURITY_MIDDLE:
System.out.println("中级");
break;
case SECURITY_NORMAL:
System.out.println("一般");
break;
}
System.out.println("====================");
}
}