java后端内存分页
/**
* @currPageNo 页面传入的页号,从一开始
* @pageSize 每页记录数
*/
public <T> Map<String, Object> getPagingResultMap(List<T> list, Integer currPageNo, Integer pageSize) {
Map<String, Object> retMap = new HashMap<>();
if (list.isEmpty()) {
retMap.put("result", Collections.emptyList());
retMap.put("pageNo", 0);
retMap.put("pageRowNum", 0);
retMap.put("totalRowNum", 0);
retMap.put("totalPageNum", 0);
return retMap;
}
int totalRowNum = list.size();
int totalPageNum = (totalRowNum - 1) / pageSize + 1;
int realPageNo = currPageNo;
if (currPageNo > totalPageNum) {
realPageNo = totalPageNum;
} else if (currPageNo < 1) {
realPageNo = 1;
}
int fromIdx = (realPageNo - 1) * pageSize;
int toIdx = realPageNo * pageSize + 1;
if (realPageNo == totalPageNum && totalPageNum * pageSize > totalRowNum) {
toIdx = totalRowNum + 1;
}
List<T> result = list.subList(fromIdx, toIdx);
retMap.put("result", result);
retMap.put("pageNo", realPageNo);
retMap.put("pageRowNum", result.size());
retMap.put("totalRowNum", totalRowNum);
retMap.put("totalPageNum", totalPageNum);
return retMap;
}
---------------------
作者:netyeaxi
来源:CSDN
原文:https://blog.csdn.net/netyeaxi/article/details/78866370
版权声明:本文为博主原创文章,转载请附上博文链接!