strut中分处理

技术2022-06-22 43

----------------------分页类-------------------

package entity;

import java.util.ArrayList;import java.util.List;

/** * 作者：何桂坤注释导入快捷键 Shift+alt+j 时间：2011-1-7 * 电子邮件：heguikun@foxmail.com QQ：307839227 * MSN：heguikun@msn.com */@SuppressWarnings("unchecked")public class PageManage { // 初始值都为0，因为有时候数据为空 int currentPage = 1;// 当前页 int beforePage = 1;// 上一页 int nextPage = 1;// 下一页 int totalPages = 0;// 总页数 int pagesize = 0;// 每页显示的长度 int allsize = 0;// 数据总长度 public PageManage() {// 构造方法 } // 构造方法：数据集合总数据长度，每页显示的长度，当以的页码 public PageManage( int allsize, int pagesize, int currentPage) { this.allsize = allsize;// 数据总长度 this.pagesize = pagesize;// 每页显示的长度 this.currentPage = currentPage;// 当前页 System.out.println("数据总长度：" + allsize + "/n每页显示的长度：" + pagesize + "/n当前页：" + currentPage); pm();// 调用方法分页 System.out.println("调用分页bean运行结束！"); }

public void pm() { double a = allsize;// 设置为daouble 下面计算总页才正确 totalPages = (int) Math.ceil(a/pagesize);// 计算总页 if (1<currentPage&¤tPage < totalPages) {// 当前页<总页 this.nextPage = this.currentPage + 1;// 设置下一页 this.beforePage = currentPage - 1;// 设置上一页 System.out.println("已设置上下一页"); } else { if(currentPage<=1){ this.beforePage=1;//异常就默认为1 this.nextPage = 2;// 当前页>最大页，则把它定为最后一页 } if(currentPage>totalPages){ this.nextPage = totalPages;// 当前页>最大页，则把它定为最后一页 this.beforePage=totalPages-1; } if(currentPage==totalPages){ this.nextPage = 1;// 当前页>最大页，则把它定为最后一页 this.beforePage=totalPages-1; } } } public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } public int getBeforePage() { return beforePage; } public void setBeforePage(int beforePage) { this.beforePage = beforePage; } public int getNextPage() { return nextPage; } public void setNextPage(int nextPage) { this.nextPage = nextPage; } public int getTotalPages() { return totalPages; } public void setTotalPages(int totalPages) { this.totalPages = totalPages; } public int getPagesize() { return pagesize; } public void setPagesize(int pagesize) { this.pagesize = pagesize; } public int getAllsize() { return allsize; } public void setAllsize(int allsize) { this.allsize = allsize; } // 测试 public static void main(String[] args) { List list = new ArrayList(); list.add("1"); list.add("1"); list.add("1"); list.add("1"); list.add("1"); list.add("1"); PageManage dd = new PageManage( 26, 5, 5);// 共26条，每页显示5条，当前第5页 System.out.println("上页" + dd.getBeforePage()); System.out.println("下页" + dd.nextPage); System.out.println("当前页" + dd.currentPage); System.out.println("总页数" + dd.totalPages);

}

}--------------------------------action---------------------------

public ActionForward ToPxxm(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { String Page=request.getParameter("page");//取得要查询的页码 currentpage= Integer.parseInt(Page==null?"1":Page.trim());//等于空就转为1页 pagesize=5;//每页显示15条 Maxsize=dao.getTotalCount("Psxm");//查询总共有多少条信息，出入类的字符串形式 if (currentpage>1) { startsize=(currentpage-1)*pagesize;//开始查找的索引=当前页*没也显示的条数 }else{startsize=0;currentpage=1;} List psxmlist=null; try { System.out.println("====================开始查询数据================"); psxmlist = dao.Query("from Psxm", startsize, pagesize);//对象，开始索引，查找长度startsize, pagesize } catch (Exception e) { System.out.println("调用dao.Query(from Psxm, startsize, pagesize)时出错！"); e.printStackTrace(); } //总数据长度，本页显示的长度，当以的页码// PageManage pmManage=new PageManage(Maxsize,pagesize,currentpage);//分页bean request.setAttribute("psxmlist", psxmlist); request.setAttribute("pmManage", pmManage);//把分页的bean放到请求中 System.out.println("==================================返回页面=============================="); return mapping.findForward("pxglPxxm"); }

---------------------------------页面使用分页---------------------------------

<TR style="BACKGROUND-COLOR: #f0f1f0"> <td colspan="12" background="${pageContext.request.contextPath }/page/heguikunPxgl/images/dg_head_bg.gif"> <A href="http://localhost:8080/HRMS/pxgl.do?operate=ToPxxm&page=1" id="First" title="第一页" style="FONT-SIZE: medium; FONT-FAMILY: webdings" >7</A> <A href="http://localhost:8080/HRMS/pxgl.do?operate=ToPxxm&page=${pmManage.beforePage}" id="Prev" title="上一页" style="FONT-SIZE: medium; FONT-FAMILY: webdings" >3</A> <A href="http://localhost:8080/HRMS/pxgl.do?operate=ToPxxm&page=${pmManage.nextPage}" id="_Next" title="下一页" style="FONT-SIZE: medium; FONT-FAMILY: webdings" >4</A> <A href="http://localhost:8080/HRMS/pxgl.do?operate=ToPxxm&page=${pmManage.totalPages}" id="Last" title="最后一页" style="FONT-SIZE: medium; FONT-FAMILY: webdings" >8</A> 现在是第 ${requestScope.pmManage.currentPage}页，一共有 ${requestScope.pmManage.totalPages}页 本页显示条${requestScope.pmManage.pagesize}记录共有${requestScope.pmManage.allsize}条记录 转到： <INPUT onKeyUp="CheckNumBer(this,${requestScope.pmManage.totalPages})"; style="WIDTH: 40px" maxLength="6" value="4" onafterpaste="CheckNumBer(this,${requestScope.pmManage.totalPages});" id="pageNum"> <a onClick="sbpage()"> <INPUT style="WIDTH: 54px; HEIGHT: 22px" type="image" src="${pageContext.request.contextPath}/page/heguikunPxgl/images/gotopage.gif" align="bottom" border="0" /> </a> </td> </TR>

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