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WEB開發(fā)中Struts分頁(yè)算法作者:本站原創(chuàng)發(fā)布時(shí)間:2010-06-25來源:JAVA中文網(wǎng) 點(diǎn)我投稿
教程由JAVA中文網(wǎng)整理校對(duì)發(fā)布() /**
* 分頁(yè)算法 */ package cn.eshore.user.util; public class PageBean {
private int currentPage = 1;// 當(dāng)前頁(yè)數(shù)
public int totalPages = 0;// 總頁(yè)數(shù)
private int pageSize = 0;// 每頁(yè)顯示數(shù)
private int totalRows = 0;// 總數(shù)據(jù)數(shù)
private int startNum = 0;// 開始記錄
private int nextPage = 0;// 下一頁(yè)
private int previousPage = 0;// 上一頁(yè)
private boolean hasNextPage = false;// 是否有下一頁(yè)
private boolean hasPreviousPage = false;// 是否有前一頁(yè)
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，那么你在調(diào)用這個(gè)PageBean分頁(yè)算法之前，你得先取得對(duì)你所想要進(jìn)行分頁(yè)的數(shù)據(jù)的總記錄數(shù)，然后你就實(shí)例化這個(gè)PageBean，之后你就可以通過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); //從服務(wù)層里得到用戶的總記錄數(shù)
int totalRows = userService.getTotalRows(); PageBean page = new PageBean(pageSize, currentPage, totalRows);
....
} } WEB開發(fā)中Struts分頁(yè)算法(本教程僅供研究和學(xué)習(xí)，不代表JAVA中文網(wǎng)觀點(diǎn))
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