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一个分页的类及调用的例子

时间： 2021-07-31 作者：daque

//pagect.java 分页的类/**** @version ************** created on 2001年6月25日, 下昼14:41***************************************/package vod;import java.sql.*;import java.util.*;public class pagect{ private long l_start; //发端记录 private long l_end; //中断记录 private long l_curpage; //暂时页数 private long l_totalnum;//总记载数 private int int_num=5; //每页10条 private long l_totalpage; //总的页数 public void init(long currentpage,long totalnum) { l_curpage = currentpage; l_totalnum = totalnum; if (currentpage>=0) { if (currentpage>=(long)math.ceil((double)l_totalnum/(double)int_num)) l_curpage = (long)math.floor((double)l_totalnum/(double)int_num); else l_curpage = currentpage; } else { l_curpage = 0; } l_start = l_curpage * int_num; l_end = l_start + int_num; if (l_end > l_totalnum) l_end = l_totalnum; l_totalpage = (long)math.ceil((double)l_totalnum/(double)int_num); } public long getcurpage() { return l_curpage; } public long getprepage() { if (l_curpage-1>=0) { return l_curpage-1; } else { return 0; } } public long getnextpage() { if (l_curpage+1<=l_totalpage) { return l_curpage+1; } else { return l_totalpage; } } public long gettotalnum() { return l_totalnum; } public long gettotalpage() { return l_totalpage; } public long getstart() { return l_start; } public long getend() { return l_end; }};===============================================//挪用例子<%/**** @author 马毅 ************** @version ************** created on 2001年6月12日, 下昼17:13***************************************/<%@ page import="java.sql.*"%><%@ page import="java.lang.*"%><%@ page contenttype="text/html;charset=utf8" %><jsp:usebean id="pagecount" scope="page" class="kstest.pagect" /><jsp:usebean id="sqlbean" scope="page" class="vod.sql_data" /><html><head><title>尝试</title><style>body,table{font-size:9pt}a:link { color: #000084; text-decoration: none}a:visited { color: #000084; text-decoration: none}a:hover { color: black; text-decoration: underline}.ourfont { font-size: 9pt}</style></head><body bgcolor=#eff3ff><center><font color=#000084><h3>test for test</h3></font><hr width=600 color=#b5dbff><br><%resultset rs0 = sqlbean.executequery("select count(*) from userlist );rs0.next();long data_num=rs0.getlong(1);long current_page = 0;string currentpage=(string)request.getparameter("currentpage");if (currentpage != null && !currentpage.equals("")){ current_page = integer.parseint(request.getparameter("currentpage"));}string query_page=(string)request.getparameter("query_page");if (query_page!=null && !query_page.equals("")){ current_page = integer.parseint(request.getparameter("query_page"))-1;}pagect.init(current_page,data_num);long l_start = pagect.getstart();long l_end = pagect.getend();//查问记载resultset rs = sqlbean.executequery("select * from userlist " );long i=0;while((i<l_start) && rs.next()){ i++;} //输入查问截止long j=0;while(rs.next() && (i<l_end)){ j=i+1; string col2 = rs.getstring(2); string col3 = rs.getstring(3); string col4 = rs.getstring(4); string col5 = rs.getstring(5); string col6 = rs.getstring(6); string col7 = rs.getstring(7); string col8 = rs.getstring(8); //打字与印刷所表露的数据 out.println("<table border=0 width=600>"); out.println("<tr><td colspan=2><font color=#000084>" + j + "、"+(col2==null?"":col2)+"</font></td></tr><tr><td colspan=2>谜底："+(col3==null?"":col3)+"</td></tr>"); out.println("<tr><td> 选项1："+(col4==null?"":col4)+"</td><td> 选项2："+(col5==null?"":col5)+"</td></tr>"); out.println("<tr><td> 选项3："+(col6==null?"":col6)+"</td><td> 选项4："+(col7==null?"":col7)+"</td></tr>"); if (col8!=null && !col8.equals("")) { out.println("<tr><td colspan=2>备注："+col8+"</td></tr>"); } out.println("</table><br>"); i++;}%><table width=600><tr bgcolor=#b5dbff><form method=get action=index.jsp><td width=80 align=center valign=bottom>共 <%=pagect.gettotalnum()%> 条</td><td width=80 align=center valign=bottom><%=pagect.getcurpage()+1%>/<%=pagect.gettotalpage()%> 页</td><td width=120 align=center>察看第 <input type=text name=query_page size=3> 页</td><td width=50 align=center valign=bottom><a href=index.jsp?currentpage=<%=pagect.getprepage()%>>上页</a></td><td width=50 align=center valign=bottom><a href=index.jsp?currentpage=<%=pagect.getnextpage()%>>下页</a></td></tr></table><br><br><br><table cellspacing=20><tr><td>题目包括<input type=text name=question_str size=10 value=<% if (question_str != null) out.println(question_str); %> ></td><td>谜底包括<input type=text name=answer_str size=10 value=<% if (answer_str != null) out.println(answer_str); %> ></td><td>选项包括<input type=text name=sel_str size=10 value=<% if (sel != null) out.println(sel); %> ></td></tr><tr><td colspan=3 align=center><input type=submit value=查问></td></tr></form></table><br><br><a href="insert.jsp">增添</a><center></body></html>

一个分页的类及调用的例子

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