MongoDB分页查询

一、自定义工具类

/**
 * @ClassName SpringDataPageable
 * @Author jiege
 * @Date 2021/4/30 10:18
 **/
import java.io.Serializable;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;

public class SpringDataPageable implements Serializable, Pageable {
    private static final long serialVersionUID = 1;
    // 当前页
    private Integer pagenumber = 1;
    // 当前页面条数
    private Integer pagesize = 10;
    // 排序条件
    private Sort sort;

    // 当前页面
    @Override
    public int getPageNumber() {
        return getPagenumber();
    }

    // 每一页显示的条数
    @Override
    public int getPageSize() {
        return getPagesize();
    }

    // 第二页所需要增加的数量

    public long getOffset() {
        return (getPagenumber() - 1) * getPagesize();
    }

    @Override
    public Sort getSort() {
        return sort;
    }

    public Integer getPagenumber() {
        return pagenumber;
    }

    public void setPagenumber(Integer pagenumber) {
        this.pagenumber = pagenumber;
    }

    public Integer getPagesize() {
        return pagesize;
    }

    public void setPagesize(Integer pagesize) {
        this.pagesize = pagesize;
    }

    public void setSort(Sort sort) {
        this.sort = sort;
    }

    @Override
    public Pageable first() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean hasPrevious() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public Pageable next() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Pageable previousOrFirst() {
        // TODO Auto-generated method stub
        return null;
    }
}

　二、创建service

//分页
public Page<AisShipRealtimeEntity> paginationQuery(Integer pageNum);

　三、实现类

public Page<AisShipRealtimeEntity> paginationQuery(Integer pageNum) {
        SpringDataPageable pageable = new SpringDataPageable();
        Query query = new Query();
        List<Sort.Order> orders = new ArrayList<Sort.Order>();  //排序
        orders.add(new Sort.Order(Sort.Direction.DESC, "createTime"));
        Sort sort = new Sort(orders);

        // 开始页
        pageable.setPagenumber(pageNum);
        // 每页条数
        pageable.setPagesize(10);
        // 排序
        pageable.setSort(sort);
        // 查询出一共的条数
        Long count = mongoTemplate.count(query, AisShipRealtimeEntity.class);
        // 查询
        List<AisShipRealtimeEntity> list = mongoTemplate.find(query.with(pageable), AisShipRealtimeEntity.class);
        // 将集合与分页结果封装
        Page<AisShipRealtimeEntity> pagelist = new PageImpl<AisShipRealtimeEntity>(list, pageable, count);

        return pagelist;

    }

　　四、控制层

　　　　Page<AisShipRealtimeEntity> list = aisShipRealtimeService.paginationQuery(limit);
　　　　System.out.println(list);
很简单操作，后面是操作实现类