分页：自己写分页（不用pagehelper）

1，pageHelper分页请参考：
https://blog.youkuaiyun.com/nanhuaibeian/article/details/106649936
2，自己写分页：

package com.zkml.hkm.common;

import lombok.Data;

import java.io.Serializable;

/**

• @author shiyf

• @description

• @since 2021-12-28
  */
  @Data
  public class PageBean implements Serializable {

  /**

  • 序列化
    */
    private static final long serialVersionUID = 1L;

  /**

  • 每页显示条数
    /
    private Integer pageSize = 10;
    /*
  • 当前页数
    /
    private Integer pageNum = 1;
    /*
  • 起始条数
    */
    private Integer beginIndex = 0;

  public void setBeginIndex(Integer beginIndex) {
  this.beginIndex = beginIndex;
  }

  public void setPageSize(Integer pageSize) {
  this.pageSize = pageSize;
  if (pageSize != null) {
  this.beginIndex = (this.pageNum - 1) * this.pageSize;
  }
  }

  public void setPageNum(Integer pageNum) {
  this.pageNum = pageNum;
  if (pageNum != null) {
  this.beginIndex = (this.pageNum - 1) * this.pageSize;
  }
  }

}
/**

• 保费管理参数

• @author xie

• @Date 2022/01/13
  */
  @ApiModel(description = “保费管理参数”)
  @Data
  public class PremiumDto extends PageBean {

  /**

  • 获取保费总行列表
  • @param premiumDto
  • @return
    */
    @PostMapping(value = “/queryPremiumInfoList”)
    @ApiOperation(“获取保费总行列表”)
    public ResponseBean queryPremiumBankList(@RequestBody PremiumDto premiumDto){
    return premiumService.queryPremiumBankList(premiumDto);
    }

@Override
public ResponseBean queryPremiumBankList(PremiumDto premiumDto) {

    log.info("保费总行列表查询参数：{}", premiumDto);
    ResponseBean response = new ResponseBean();
    try{
        //查询总行信息列表条数、总金额、总笔数、总支行数
        Map<String,Object> countMap = premiumMapper.queryPremiumBankListCount(premiumDto);
        long totalCount = (Long) countMap.get("totalCount");
        BigDecimal totalNum = (BigDecimal) countMap.get("totalNum");
        if(totalNum == null){
            totalNum = new BigDecimal(0);
        }
        Double totalAmount = (Double) countMap.get("totalAmount");
        if(totalAmount == null){
            totalAmount = 0.00;
        }
        Integer totalBranchCount = premiumMapper.queryPremiumBankBranchCount(premiumDto);

        log.info("总行信息列表查询条数：{}",totalCount);
        List<Map<String,Object>> bankList = new ArrayList<>();
        if(totalCount>0){
            //查询总行信息列表
            bankList = premiumMapper.queryPremiumBankList(premiumDto);
            //查询支行数
            for(int i =0; i<bankList.size(); i++){
                String bankName = (String) bankList.get(i).get("premiumBank");
                premiumDto.setBankName(bankName);
                int branchCount = premiumMapper.queryPremiumBankBranchCount(premiumDto);
                bankList.get(i).put("branchCount",branchCount);
            }
        }
        Map<String, Object> result = new HashMap<>(Constant.MAP_DEFAULT_SIZE);
        result.put("total", totalCount);
        result.put("totalNum", totalNum);
        result.put("totalAmount", totalAmount);
        result.put("totalBranchCount", totalBranchCount);
        result.put("content", bankList);
        result.put("pageSize", premiumDto.getPageSize());
        result.put("pageNum", premiumDto.getPageNum());
        response.setData(result);
        response.setCode(1);
        response.setMessage("总行信息列表查询成功！");
        return response;
    }catch (Exception e){
        log.info("总行信息列表查询异常：{}",e);
        response.setStatus(Constant.FAIL_STATUS);
        response.setCode(0);
        response.setMessage("总行信息列表查询异常！");
        return response;
    }
}