mysql 分页
<%@ page language="java" import="java.sql.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>平板显示</title>
</head>
<%
int pageSize = 3;
String strPageNo = request.getParameter("pageNo");
int pageNo = 1;
if(strPageNo == null || strPageNo.equals("")){
pageNo = 1;
}else{
//处理是否字符串
try{
pageNo = Integer.parseInt(strPageNo.trim());
}catch(NumberFormatException e){
pageNo = 1;
}
//判断是否为负数
if(pageNo <= 0) pageNo = 1;
}
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/bbs?user=root&password=****";
Connection conn = DriverManager.getConnection(url);
//获得总记录数
Statement stmtCount = conn.createStatement();
ResultSet rsCount = stmtCount.executeQuery("select count(*) from article where pid = 0");
rsCount.next();
int totalRecords = rsCount.getInt(1);
//算得总页数
int totalPages = totalRecords % pageSize == 0 ? totalRecords / pageSize : totalRecords /pageSize + 1;
//判断页数是否过头
if(pageNo > totalPages) pageNo = totalPages;
//这里计算当前页
int startPos = (pageNo - 1) * pageSize;
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from article where pid = 0 order by pdate desc limit " + startPos + ", " + pageSize);
%>
<body>
<a href="Post.jsp">发表新贴</a>
<table border="1">
<%
while(rs.next()){
%>
<tr>
<td><a href=""><%=rs.getString("cont")%></a></td>
</tr>
<%
}
%>
</table>
总有<%=totalPages %>页;现在是第<%=pageNo %>页
<br />
<a href="ShowArticleFlat.jsp?pageNo=<%=pageNo-1 %>"> << </a>
<a href="ShowArticleFlat.jsp?pageNo=<%=pageNo+1 %>"> >> </a>
<form action="" name="form1">
<select name="pageNo" onchange="document.form1.submit()">
<%
for(int i = 1; i <= totalPages; i++){
%>
<option value=<%=i %> <%=(pageNo == i)? "selected" : "" %>>第<%=i %></option>
<%
}
%>
</select>
</form>
<!-- -->
<form name="form2" action="ShowArticleFlat.jsp">
<input type="text" size="4" name="pageNo" value="<%=pageNo %>" />
<input type="submit" value="Go>>" />
</form>
<%
rs.close();
stmt.close();
conn.close();
%>
</body>
</html>
create database bbs; use bbs; create table article ( id int primary key auto_increment, pid int, rootid int, title varchar(255), cont text, pdate datetime, isleaf int ); insert into article values (null, 0, 1, '蚂蚁大战大象', '蚂蚁大战大象', now(), 1); insert into article values (null, 1, 1, '大象被打趴下了', '大象被打趴下了',now(), 1); insert into article values (null, 2, 1, '蚂蚁也不好过','蚂蚁也不好过', now(), 0); insert into article values (null, 2, 1, '瞎说', '瞎说', now(), 1); insert into article values (null, 4, 1, '没有瞎说', '没有瞎说', now(), 0); insert into article values (null, 1, 1, '怎么可能', '怎么可能', now(), 1); insert into article values (null, 6, 1, '怎么没有可能', '怎么没有可能', now(), 0); insert into article values (null, 6, 1, '可能性是很大的', '可能性是很大的', now(), 0); insert into article values (null, 2, 1, '大象进医院了', '大象进医院了', now(), 1); insert into article values (null, 9, 1, '护士是蚂蚁', '护士是蚂蚁', now(), 0);
出自尚学堂_马士兵老师的视频!!
应该这样发????呵呵!