分页查询-蒲公英云

分页查询

/**
* 真分页
* @param
* @param req
* @return
* @return 对象page
*/
private static Page truePaging (int allRecord,HttpServletRequest req){
//设置每页显示数
int pageSizeStr = 5;
// 得到当前页数
String pageIndexStr = req.getParameter(“pageIndex”);
if (pageIndexStr == null) {
pageIndexStr = “1”;
}
int pageIndex = Integer.parseInt(pageIndexStr);
req.setAttribute(“pageIndex”, pageIndex);

//得到总页数
int allPage = (allRecord % pageSizeStr == 0) ? (allRecord / pageSizeStr)
: (allRecord / pageSizeStr + 1);
req.setAttribute(“allPage”, allPage);

//返回总共记录数
req.setAttribute(“allRecord”, allRecord) ;
int toIndex = pageSizeStr * (pageIndex);
// 判断是不是最9后一页
if (pageIndex == allPage) {
toIndex = allRecord;
}
Page page = new Page();
page.setFirstline(pageSizeStr * (pageIndex - 1));
page.setLastline(toIndex);
return page;
}

/**
* 假分页
* @param list
* @param req
* @return
*/
private static List paging(List list,HttpServletRequest req){
//设置每页显示数
int pageSizeStr = 5;
// 得到当前页数
String pageIndexStr = req.getParameter(“pageIndex”);
if (pageIndexStr == null) {
pageIndexStr = “1”;
}
int pageIndex = Integer.parseInt(pageIndexStr);
req.setAttribute(“pageIndex”, pageIndex);

//得到总页数
int allPage = (list.size() % pageSizeStr == 0) ? (list.size() / pageSizeStr)
: (list.size() / pageSizeStr + 1);
req.setAttribute(“allPage”, allPage);
//返回总共记录数
req.setAttribute(“allRecord”, list.size()) ;
int toIndex = pageSizeStr * (pageIndex);
// 判断是不是最后一页
if (pageIndex == allPage) {
toIndex = list.size();
}
List list2 = list.subList(pageSizeStr * (pageIndex - 1),toIndex);
return list2;
}

真分页的调用

Page page =truePaging(allRecord,req);
book.setPage(page);

list = adminBiz.findBookAll(book);
if(list.size() == 0){
req.setAttribute(“allRecord”, 0);
return “/All_book.jsp”;
}
req.setAttribute(“bookInfo”, book);
req.setAttribute(“bookList”,list);

return “/All_book.jsp”;

假分页

List list2 = paging(list, req);
req.setAttribute(“informAll”, list2);
return “/pbshow_list.jsp”;

页面样式

共${allRecord}条记录，当前显示第 ${pageIndex} 页

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