lucene学习笔记四(分页查询)
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2022-07-09 10:12:31
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/**
* 根据页码和分页大小获取上一次最后一个ScoreDoc
* @param pageIndex
* @param pageSize
* @param query
* @param indexSearcher
* @return
* @throws IOException
*/
private ScoreDoc getLastScoreDoc(int pageIndex,int pageSize,Query query,IndexSearcher indexSearcher) throws IOException{
if(pageIndex==1)return null;//如果是第一页返回空
int num = pageSize*(pageIndex-1);//获取上一页的数量
TopDocs tds = indexSearcher.search(query, num);
return tds.scoreDocs[num-1];
}
public void searchPage(String query,int pageIndex,int pageSize){
IndexSearcher indexSearcher = getSearcher();
QueryParser parser = new QueryParser("content", new StandardAnalyzer());
Query q = null;
try {
q = parser.parse(query);
//获取上一页的最后一个元素
ScoreDoc lastScoreDoc = getLastScoreDoc(pageIndex, pageSize, q, indexSearcher);
//通过最后一个元素搜索下页的pageSize个元素
TopDocs topDocs = indexSearcher.searchAfter(lastScoreDoc,q,pageSize);
for (ScoreDoc item : topDocs.scoreDocs) {
Document doc = indexSearcher.doc(item.doc);
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(Long.valueOf(doc.get("date")));
System.out.println("名字:" + doc.get("name") + "邮箱:" + doc.get("email") + "id:" + doc.get("id") + "附件个数:"
+ doc.get("attach") + "日期:" + cal.getTime().toString());
}
} catch (Exception e) {
e.printStackTrace();
}
}
转载于:https://my.oschina.net/kkrgwbj/blog/513986
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