WEB开发中Struts分页算法作者:本站原创发布时间:2010-06-25来源:JAVA中文网 点我投稿
教程由JAVA中文网整理校对发布() /**
* 分页算法 */ package cn.eshore.user.util; public class PageBean {
private int currentPage = 1;// 当前页数
public int totalPages = 0;// 总页数
private int pageSize = 0;// 每页显示数
private int totalRows = 0;// 总数据数
private int startNum = 0;// 开始记录
private int nextPage = 0;// 下一页
private int previousPage = 0;// 上一页
private boolean hasNextPage = false;// 是否有下一页
private boolean hasPreviousPage = false;// 是否有前一页
public PageBean(int pageSize, int currentPage, int totalRows) {
this.pageSize = pageSize;
this.currentPage = currentPage; this.totalRows = totalRows; if ((totalRows % pageSize) == 0) {
totalPages = totalRows / pageSize; } else { totalPages = totalRows / pageSize + 1; } if (currentPage >= totalPages) {
hasNextPage = false; currentPage = totalPages; } else { hasNextPage = true; } if (currentPage <= 1) {
hasPreviousPage = false; currentPage = 1; } else { hasPreviousPage = true; } startNum = (currentPage - 1) * pageSize;
nextPage = currentPage + 1;
if (nextPage >= totalPages) {
nextPage = totalPages; } previousPage = currentPage - 1;
if (previousPage <= 1) {
previousPage = 1; } }
public boolean isHasNextPage() {
return hasNextPage;
}
public boolean isHasPreviousPage() {
return hasPreviousPage;
}
/**
* @return the nextPage */ public int getNextPage() { return nextPage; } /**
* @param nextPage * the nextPage to set */ public void setNextPage(int nextPage) { this.nextPage = nextPage; } /**
* @return the previousPage */ public int getPreviousPage() { return previousPage; } /**
* @param previousPage * the previousPage to set */ public void setPreviousPage(int previousPage) { this.previousPage = previousPage; } /**
* @return the currentPage */ public int getCurrentPage() { return currentPage; } /**
* @param currentPage * the currentPage to set */ public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } /**
* @return the pageSize */ public int getPageSize() { return pageSize; } /**
* @param pageSize * the pageSize to set */ public void setPageSize(int pageSize) { this.pageSize = pageSize; } /**
* @return the totalPages */ public int getTotalPages() { return totalPages; } /**
* @param totalPages * the totalPages to set */ public void setTotalPages(int totalPages) { this.totalPages = totalPages; } /**
* @return the totalRows */ public int getTotalRows() { return totalRows; } /**
* @param totalRows * the totalRows to set */ public void setTotalRows(int totalRows) { this.totalRows = totalRows; } /**
* @param hasNextPage * the hasNextPage to set */ public void setHasNextPage(boolean hasNextPage) { this.hasNextPage = hasNextPage; } /**
* @param hasPreviousPage * the hasPreviousPage to set */ public void setHasPreviousPage(boolean hasPreviousPage) { this.hasPreviousPage = hasPreviousPage; } /**
* @return the startNum */ public int getStartNum() { return startNum; } /**
* @param startNum * the startNum to set */ public void setStartNum(int startNum) { this.startNum = startNum; } } 如果你使用的是struts,那么你在调用这个PageBean分页算法之前,你得先取得对你所想要进行分页的数据的总记录数,然后你就实例化这个PageBean,之后你就可以通过get方法得到任何你想要的值。
package test;
import cn.eshore.user.util.PageBean;
public class Test extends DispatchAction{
......
public ActionForward loadPageUser(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) { .......
int pageSize = 5; String pageId = request.getParameter("pageId");
if (pageId == null || pageId.equals("")) { pageId = "1"; } int currentPage = Integer.parseInt(pageId); //从服务层里得到用户的总记录数
int totalRows = userService.getTotalRows(); PageBean page = new PageBean(pageSize, currentPage, totalRows);
....
} } WEB开发中Struts分页算法(本教程仅供研究和学习,不代表JAVA中文网观点)
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