Displaytag1.1支持在外部實(shí)現(xiàn)大數(shù)據(jù)量分頁(yè)。主要有兩種方式實(shí)現(xiàn)：
Displaytag 1.1 offers two alternative ways for working with partial lists:
-
the first one uses the valuelist pattern, and requires that the object that you give to displaytag implements the org.displaytag.pagination.PaginatedList interface. You can pass this object to displaytag as an usual list, and it will extract paging and sorting information from it. This way is more recommended if you have to build your backend layer and you can easily follow this pattern.
-
a second way, recommended if you only have to use partial list for few tables that show a performance problem using full lists, is passing all the needed parameters as separate tag attributes (recors to be shown, page number, total number of records...)
其中第二種方式看起來(lái)較為簡(jiǎn)單，只需在<displaytag>中增加兩個(gè)屬性：partialList="true"size="resultSize"即可，但是在使用發(fā)現(xiàn)這種方式由于是在原來(lái)內(nèi)存分頁(yè)的基礎(chǔ)上修改的，所以還是存在一些Bug（比如：分頁(yè)導(dǎo)航的值不會(huì)變......）
所以這里介紹Displaytag推薦的第一種方式，即：
實(shí)現(xiàn)org.displaytag.pagination.PaginatedListorg.displaytag.pagination.PaginatedList接口。
實(shí)現(xiàn)PaginatedList接口：
import
?java.util.List;
import
?org.displaytag.pagination.PaginatedList;
import
?org.displaytag.properties.SortOrderEnum;
/**?*/
/**
?*?分頁(yè)列表
?*?
?*?
@author
?John.Zhu
?*?
?
*/
public
?
class
?PageList?
implements
?PaginatedList?
{
????
/**?*/
/**
?????*?每頁(yè)的列表
?????
*/
????
private
?List?list;
????
/**?*/
/**
?????*?當(dāng)前頁(yè)碼
?????
*/
????
private
?
int
?pageNumber?
=
?
1
;
????
/**?*/
/**
?????*?每頁(yè)記錄數(shù)?page?size
?????
*/
????
private
?
int
?objectsPerPage?
=
?
15
;
????
/**?*/
/**
?????*?總記錄數(shù)
?????
*/
????
private
?
int
?fullListSize?
=
?
0
;
????
private
?String?sortCriterion;
????
private
?SortOrderEnum?sortDirection;
????
private
?String?searchId;
????
public
?List?getList()?
{
????????
return
?list;
????}
????
public
?
void
?setList(List?list)?
{
????????
this
.list?
=
?list;
????}
????
public
?
int
?getPageNumber()?
{
????????
return
?pageNumber;
????}
????
public
?
void
?setPageNumber(
int
?pageNumber)?
{
????????
this
.pageNumber?
=
?pageNumber;
????}
????
public
?
int
?getObjectsPerPage()?
{
????????
return
?objectsPerPage;
????}
????
public
?
void
?setObjectsPerPage(
int
?objectsPerPage)?
{
????????
this
.objectsPerPage?
=
?objectsPerPage;
????}
????
public
?
int
?getFullListSize()?
{
????????
return
?fullListSize;
????}
????
public
?
void
?setFullListSize(
int
?fullListSize)?
{
????????
this
.fullListSize?
=
?fullListSize;
????}
????
public
?String?getSortCriterion()?
{
????????
return
?sortCriterion;
????}
????
public
?
void
?setSortCriterion(String?sortCriterion)?
{
????????
this
.sortCriterion?
=
?sortCriterion;
????}
????
public
?SortOrderEnum?getSortDirection()?
{
????????
return
?sortDirection;
????}
????
public
?
void
?setSortDirection(SortOrderEnum?sortDirection)?
{
????????
this
.sortDirection?
=
?sortDirection;
????}
????
public
?String?getSearchId()?
{
????????
return
?searchId;
????}
????
public
?
void
?setSearchId(String?searchId)?
{
????????
this
.searchId?
=
?searchId;
????}
}
Contoller：
/**?*/
/**
?????*?分頁(yè)查詢
?????*?
?????*?
@param
?request
?????*?
@param
?response
?????*?
@return
?????*?
@throws
?Exception
?????
*/
????
private
?ModelAndView?paging(HttpServletRequest?request,
????????????HttpServletResponse?response,?ModelAndView?mav)?
throws
?Exception?
{
????????
//
?獲取當(dāng)前頁(yè)數(shù)，displaytag通過(guò)參數(shù)"page"傳遞這個(gè)值
????????????????
int
?pageNumber;
????????
if
?(request.getParameter(
"
page
"
)?
!=
?
null
????????????????
&&
?
!
""
.equals(request.getParameter(
"
page
"
)))?
{
????????????pageNumber?
=
?Integer.parseInt(request.getParameter(
"
page
"
));
????????}
?
else
?
{
????????????pageNumber?
=
?
1
;
????????}
????????PageList?pageList?
=
?
new
?PageList();
????????Map?map?
=
?WebUtils.getParametersStartingWith(request,?
"
search_
"
);
????????Page?page?
=
?dao.query(map,?pageNumber,?PAGE_SIZE);
????????????????
//
?設(shè)置當(dāng)前頁(yè)數(shù)
????????pageList.setPageNumber(pageNumber);
????????????????
//
?設(shè)置當(dāng)前頁(yè)列表
????????pageList.setList(page.getResults());
????????????????
//
?設(shè)置page?size
????????pageList.setObjectsPerPage(PAGE_SIZE);
????????????????
//
?設(shè)置總頁(yè)數(shù)
????????pageList.setFullListSize(page.getTotalCount());
????????mav.addObject(
"
results
"
,?pageList);
????????
return
?mav;
????}
好了，現(xiàn)在直接在JSP上使用 displaytag就行了：
<
display:table?
name
="${results}"
?id
="row"
?class
="simple?nocol"
?pagesize
="${pageSize}"
?export
="true"
?
????????????????????decorator
="org.displaytag.decorator.TotalTableDecorator"
?
????????????????????requestURI
="${pageContext.request.contextPath}/pageQuery.do?method=paging"
>
??????????????? ?
<
display:column?
property
="date.time"
?title
="日期"
?format
="{0,date,yyyy-MM-dd}"
?sortable
="false"
?
/>
????????????????
<
display:column?
property
="code"
?title
="編碼"
?group
="1"
?sortable
="false"
?
/>
????????????????
<
display:column?
property
="name"
?title
="名稱"
?group
="1"
?sortable
="false"
?
/>
?????????????????
<
display:column?
property
="costTotal"
?title
="總額(元)"
?format
="{0,number,0,000}"
?total
="true"
?sortable
="false"
?
/>
</
display:table
>