PageRequest extends AbstractPageRequest 而 AbstractPageRequset implements Pageable

first:

写一个接受分页参数的PageRequest类(工具类)(这样就不用自己去写get、set等方法),当然也可以不写，直接使用对应的参数去接收(Controller层)

public static PageRequest getGridPageParams() {

int pageNumber = 0;

int pageSize = 20;

HttpServletRequest request = ServiceUtil.getRequest();

String P_pageNumber = request.getParameter("P_pageNumber");

String P_pagesize = request.getParameter("P_pagesize");

String order = request.getParameter("P_orders");

String stringDirection = request.getParameter("sord");

PageRequest pageRequest = null;

if (null != P_pageNumber) {

pageNumber = Integer.parseInt(P_pageNumber) - 1;

}

if (null != P_pagesize) {

pageSize = Integer.parseInt(P_pagesize);

}

if (order != null && stringDirection != null) {

Direction direction = Direction.fromString(stringDirection);

Sort sort = new Sort(direction, order);

pageRequest = new PageRequest(pageNumber, pageSize, sort);

return pageRequest;

}

pageRequest = new PageRequest(pageNumber, pageSize);

return pageRequest;

}

second：

将分页参数传给真正的spring进行管理

@GetMapping("/list")

@ResponseBody

public CommonAjaxResult getDappKindList(DappKind dappKind) {

Pageable pageable = PageUtil.getGridPageParams();//获得封装的分页data

Sort sort = new Sort(Sort.Direction.DESC, "createTime");

Pageable page = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize(), sort);

Page result = dappKindService.findByPage(dappKind, page);//调service层

PageVo pageVo = PageUtil.parseFromPage(result);//方法如下(更友好的显示给前端)

if(null != pageVo){

return CommonAjaxResult.success(pageVo);

}

return CommonAjaxResult.error("获取列表失败,请稍后再试");

}

public static PageVo parseFromPage(Page page) {

PageVo pageVo = new PageVo();

pageVo.setData(page.getContent());

pageVo.setPageNumber(page.getNumber() + 1);

pageVo.setPageSize(page.getSize());

pageVo.setTotal(page.getTotalElements());

pageVo.setTotalPages(page.getTotalPages());

return pageVo;

}

third：

在service层中进行查询条件的处理

public Page findByPage(DappKind dappKind, Pageable pageable) {

Specification specification = getWhereClause(dappKind);

return dappKindRepository.findAll(specification, pageable);//调jpa中方法

}

/**

* 查询条件的处理

*/

private Specification getWhereClause(final DappKind dappKind) {

return new Specification() {

@Override

public Predicate toPredicate(Root root, CriteriaQuery> query, CriteriaBuilder cb) {

List list = new ArrayList<>();

if (StringUtils.isNotBlank(dappKind.getId())) {

list.add(cb.equal(root.get("id").as(String.class), dappKind.getId()));

}

if (StringUtils.isNotBlank(dappKind.getName())) {

list.add(cb.like(root.get("name").as(String.class), "%" + dappKind.getName() + "%"));

}

list.add(cb.equal(root.get("status").as(String.class), DappKind.dappKindStatus.NORMAL));

Predicate[] p = new Predicate[list.size()];

return cb.and(list.toArray(p));

}

};

}

Simple Version (需要自己去写SQL(SQL中不需要关注分页参数)Mybatis帮助你实现了分页)

public AjaxResult pageList(Distribute model, Pageable pageable) {

Page pageObject = distributeService.pageList(param_map, pageable);

}