java鬼混笔记：lucene 7、查询排序和分页

Query query = queryParser.parse("我");// 排序Sort sort = new Sort();sort.setSort(new SortField("title", Type.SCORE, false));// 根据title的得分来排序其中false是升序，true就是降序TopDocs top = searcher.search(query, 12, sort);

分页


分页目前找到2种解决方案，推荐用第2种，撑住大数据情况


第1种、比如查20-30条的记录，先查出前30条，后面for循环从i = 20开始就行

Query query = queryParser.parse("VPN");
int currentPage = 1;
int pageSize = 10;

TopDocs top = searcher.search(query, (currentPage*pageSize));

System.out.println("得到" + top.totalHits + "条记录");
ScoreDoc[] scoreDocs = top.scoreDocs;
if(scoreDocs != null && scoreDocs.length > 0){
	int i = (currentPage-1)*pageSize;
	for(;i < scoreDocs.length; i++) {
		ScoreDoc s = scoreDocs[i];
		System.out.println(s.score);
		Document doc = searcher.doc(s.doc);
		System.out.println(doc.get("title"));
		System.out.println(doc.get("content"));
		markKeyWord(query, doc, analyzer);
	}
}
OK。。。

第2种、用searchAfter()方法
先生成一个ScoreDoc后用searchAfter方法

Query query = queryParser.parse("VPN");
int currentPage = 1;
int pageSize = 10;

ScoreDoc sd;

 if(currentPage == 1) {
	 sd = null;
 }else {
	 int num = pageSize*(currentPage-1);//获取上一页的最后是多少  
	 TopDocs td = searcher.search(query, num);  
	 sd = td.scoreDocs[num-1];  
 }

// 核心方法
TopDocs top = searcher.searchAfter(sd, query, 12);// 这里的12像hibernate，是在这一页上查12条

System.out.println("得到" + top.totalHits + "条记录");
ScoreDoc[] scoreDocs = top.scoreDocs;
if(scoreDocs != null && scoreDocs.length > 0){
	int i = (currentPage-1)*pageSize;
	for(;i < scoreDocs.length; i++) {
		System.out.println(i);
		ScoreDoc s = scoreDocs[0];
		System.out.println(s.score);
		Document doc = searcher.doc(s.doc);
		System.out.println(doc.get("title"));
		System.out.println(doc.get("content"));
		markKeyWord(query, doc, analyzer);
	}
}