最好的办法是利用sql语句进行分页，这样每次查询出的结果集中就只包含某页的数据内容。再sql语句无法实现分页的情况下，可以考虑对大的结果集通过游标定位方式来获取某页的数据。

sql语句分页，不同的数据库下的分页方案各不一样，下面是主流的三种数据库的分页sql：

sql server:

       String sql =

       "select top " + pageSize + " * from students where id not in" +

 "(select top " + pageSize * (pageNumber-1) + " id from students order by id)" +

 "order by id";

mysql:

       String sql =

       "select * from students order by id limit " + pageSize*(pageNumber-1) + "," + pageSize;

oracle:

       String sql =

        "select * from " + 

        (select *,rownum rid from (select * from students order by postime desc) where rid<=" + pagesize*pagenumber + ") as t" +

        "where t>" + pageSize*(pageNumber-1);

大数据量下的分页解决方法