Page 分页之 Entity to Domain java

结合分页插件 PageHelper
【Page 分页之 Entity to Domain】分页类

public class Page implements Serializable { private static final long serialVersionUID = 1L; private int page; private int pageSize; private int pages; private long total; private List rows; public Page() { }public int getPage() { return this.page; }public void setPage(int page) { this.page = page; }public int getPageSize() { return this.pageSize; }public void setPageSize(int pageSize) { this.pageSize = pageSize; }public int getPages() { return this.pages; }public void setPages(int pages) { this.pages = pages; }public long getTotal() { return this.total; }public void setTotal(long total) { this.total = total; }public List getRows() { return this.rows; }public void setRows(List rows) { this.rows = rows; } }

PageUtils

public static Page toPage(List list, Function mapper){ Page page = new Page<>(); if(list instanceof com.github.pagehelper.Page){ com.github.pagehelper.Page pagehelperPage = (com.github.pagehelper.Page) list; page.setPage(pagehelperPage.getPageNum()); page.setPageSize(pagehelperPage.getPageSize()); page.setTotal(pagehelperPage.getTotal()); page.setPages(pagehelperPage.getPages()); } List resultList = new ArrayList<>(); list.forEach(item->{ resultList.add(mapper.apply(item)); }); page.setRows(resultList); return page; }/** * 根据查询出的 list entity 对象，转换成 domain 对象，返回page对象 * @param dataList数据list * @param domainInput ,new 一个 * @param 数据库对应的entity对象 * @param 返回给页面的domain 对象 * @return */ public static Page getPageDomainForEntity(List dataList,D domainInput){ List lists = new ArrayList<>(); String className = domainInput.getClass().getName(); try { //entity 转换成 domain dataList.forEach(item->{ try { D domain = (D) Class.forName(className).newInstance(); BeanUtils.copyProperties(item, domain); lists.add(domain); } catch (Exception e) { logger.error(" 初始化实体类异常： "+ className ,e); }}); } catch (Exception e) { logger.error("进行 entity 转换 domain 失败： "+ className ,e); }//封装 page 信息 Page retPage = new Page<>(); if(dataList instanceof com.github.pagehelper.Page){ com.github.pagehelper.Page pagehelperPage = (com.github.pagehelper.Page) dataList; retPage.setPage(pagehelperPage.getPageNum()); retPage.setPageSize(pagehelperPage.getPageSize()); retPage.setTotal(pagehelperPage.getTotal()); retPage.setPages(pagehelperPage.getPages()); } retPage.setRows(lists); return retPage; }

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