display标签在Webwork中实现数据库分页

首先有一个PageInfo类，在里面放一些页面的属性，如页数什么的：

public class PageInfo ... {
privatelongallCount;//总条数
privatelongpageCount;//每页条数
privatelongpage;//第几页
privatelongpages;//一共几页

//再加上getset方法

}

写一个DisplayPageHelper类实现PaginatedList接口，用来包装要显示的数据

import java.util.List;

import org.displaytag.pagination.PaginatedList;
import org.displaytag.properties.SortOrderEnum;

public class DisplayPageHelper implements PaginatedList ... {
privateListlist;
privateintpageNumber=1;
privateintobjectsPerPage=10;
privateintfullListSize=0;
privateStringsortCriterion;
privateSortOrderEnumsortDirection;
privateStringsearchId;

publicListgetList()...{
returnlist;
}

publicvoidsetList(Listlist)...{
this.list=list;
}

publicintgetPageNumber()...{
returnpageNumber;
}

publicvoidsetPageNumber(intpageNumber)...{
this.pageNumber=pageNumber;
}

publicintgetObjectsPerPage()...{
returnobjectsPerPage;
}

publicvoidsetObjectsPerPage(intobjectsPerPage)...{
this.objectsPerPage=objectsPerPage;
}

publicintgetFullListSize()...{
returnfullListSize;
}

publicvoidsetFullListSize(intfullListSize)...{
this.fullListSize=fullListSize;
}

publicStringgetSortCriterion()...{
returnsortCriterion;
}

publicvoidsetSortCriterion(StringsortCriterion)...{
this.sortCriterion=sortCriterion;
}

publicSortOrderEnumgetSortDirection()...{
returnsortDirection;
}

publicvoidsetSortDirection(SortOrderEnumsortDirection)...{
this.sortDirection=sortDirection;
}

publicStringgetSearchId()...{
returnsearchId;
}

publicvoidsetSearchId(StringsearchId)...{
this.searchId=searchId;
}
}

在Ａｃｔｉｏｎ中得到Ｄｉｓｐｌａｙ标签的页数：

page = (String)ServletActionContext.getRequest().getParameter( " page " );

然后把参数都设到ＰａｇｅＩｎｆｏ类实例中，把ｐａｇｅＩｎｆｏ传到Ｄａｏ层，再在Ａｃｔｉｏｎ中把返回的数据用DisplayPageHelper的实例包装一下就可以了

private DisplayPageHelper display;

public String execute() {
resultSize = bookStoreManage.findBookCount();
page = (String)ServletActionContext.getRequest().getParameter("page");
if(page == null){
page = "1";
}
PageInfo pageInfo = new PageInfo();
pageInfo.setAllCount(resultSize);
pageInfo.setPageCount(20);
pageInfo.setPage(new Long(page).longValue());
display = new DisplayPageHelper();
display.setFullListSize(resultSize);
display.setPageNumber((new Integer(page)).intValue());
display.setObjectsPerPage(20);

　　bookPicList = bookStoreManage.findBookPic(null, pageInfo);
display.setList(bookPicList);

}

再加上display的get 和set方法页面就可以得到了，页面要显示的Ｌｉｓｔ是Ｄｉｓｐｌａｙ