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jsp+mysql实现分页

2011-11-19 11:38 411 查看

<%@ page contentType="text/html;charset=gb2312"%>

<%@ page import="java.sql.*"%>

<html>

<body bgcolor="lightgreen">

<center>

.恭喜你

<%=request.getParameter("user")%> 登录成功！



<br>

<a href="login.jsp">返回重新登录</a>

<h1>

用户信息列表

</h1>

<%

int pageSize = 3;

int pageNow = 1;//默认显示第一页

int pageCount = 0; //通过pageSize 和rowCount 计算

int rowCount = 0;

//对下面传过来的pageNow的值做处理

String s_pageNow = request.getParameter("pageNow");

if (s_pageNow != null) {

pageNow = Integer.parseInt(s_pageNow);

}

//加驱动

String url = "jdbc:mysql://localhost/userms_db";

String username = "root";

String password = "333";

//连接数据库

Class.forName("org.gjt.mm.mysql.Driver");

Connection conn = DriverManager.getConnection(url, username,

password);

//生成Statement

Statement stmt = conn.createStatement();

String sql = "select count(*) from user";

ResultSet rs = stmt.executeQuery(sql);

//得到rowCount

if (rs.next()) {

rowCount = rs.getInt(1);

}

//得到pageCount

if (rowCount % pageSize == 0) {

pageCount = rowCount / pageSize;

} else {

pageCount = rowCount / pageSize + 1;

}

%>



<table border="1">

<tr>

<td>

user_id

</td>

<td>

user_name

</td>

<td>

passwd

</td>

<td>

sex

</td>

<td>

QQ

</td>

<td>

email

</td>

</tr>

<%

// sql = "select top " + pageSize

// + "* from user where user_id not in( select top " + pageSize

// * (pageNow - 1) + " user_id from user)";//难道只适合sqlsever?用到这里会报错

sql = "select * from user order by user_id LIMIT "+(pageNow-1)*pageSize+"," + pageSize+" ";//如果pageNow为2，

//那么他前面有一页，每页显示3条记录，那么第二页显示的记录就该是从(2-1)*3【第4条（记录是从0开始编号的）】记录开始，依次往后加3条【包括第四条】

rs = stmt.executeQuery(sql);

while (rs.next()) {

%>

<tr>

<td><%=rs.getInt(1)%></td>

<td><%=rs.getString(2)%></td>

<td><%=rs.getString(3)%></td>

<td><%=rs.getString(4)%></td>

<td><%=rs.getString(5)%></td>

<td><%=rs.getString(6)%></td>

</tr>

<%

}

%>

</table>

<%

//显示超链接部分

if (pageNow != 1) {

out.println("<a href=wel.jsp?pageNow=" + (pageNow - 1)

+ ">上一页</a>");

}

for (int i = 1; i <= pageCount; i++) {

out

.println("<a href=wel.jsp?pageNow=" + i + ">[" + i

+ "]</a>");

}

if (pageNow != pageCount) {

out.println("<a href=wel.jsp?pageNow=" + (pageNow + 1)

+ ">下一页</a>");

}

%>

</center>

</body>

</html>

之前分页那儿遇到瓶颈，今天来看，突然就发现好简单大概当时思维太乱吧

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