相关代码
<%--
Created by IntelliJ IDEA.
User: 11637
Date: 2020/4/10
Time: 13:00
To change this template use File | Settings | File Templates.
--%>
<%@ page import="java.sql.*" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%!
int totalpages = 0;
int pageSize = 20;
int totalRecords = 0;
int xpage = 1;
%>
<%
String JDBC_DRIVER = "com.mysql.jdbc.Driver";
String DB_URL = "jdbc:mysql://localhost:3306/world";
String USER = "user";
String PASS = "password";
try {
Class.forName(JDBC_DRIVER);
Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
String sql = "SELECT count(*) FROM city";
PreparedStatement psmt = conn.prepareStatement(sql);
ResultSet rs = psmt.executeQuery();
rs.next();
totalRecords = rs.getInt(1);
String aa = request.getParameter("page");
if (aa == null || xpage<1) {
xpage = 1;
} else {
try {
xpage = Integer.parseInt(aa);
} catch (NumberFormatException e) {
xpage = 1;
}
}
if (totalRecords % pageSize == 0) {
totalpages = totalRecords / pageSize;
} else {
totalpages = totalRecords / pageSize + 1;
}
totalpages = (totalRecords + pageSize - 1) / pageSize;
sql = "SELECT * FROM city";
psmt = conn.prepareStatement(sql);
rs = psmt.executeQuery();
if (xpage >= totalpages) {
for (int i = 1; i <= (totalpages - 1) * pageSize; i++) {
rs.next();
}
} else {
for (int i = 1; i <= (xpage - 1) * pageSize; i++) {
rs.next();
}
}
%>
<!--
数据展示页面的设计
-->
<html>
<head>
<title>仿百度页面的分页显示</title>
</head>
<body>
<center>
<h3>世界城市人口数据</h3>
<hr width="80%">
<table border="1" width="80%" align="center">
<%
for (int i = 1; i <= pageSize; i++) {
if (!rs.next()) {
break;
}
int id = rs.getInt(1);
String name1 = rs.getString(2);
String countrycode = rs.getString(3);
String district = rs.getString(4);
int population = rs.getInt(5);
%>
<%-- 数据展示--%>
<tr align="center">
<td style="width: 20%"><%=id%>
</td>
<td style="width: 20%"><%=name1%>
</td>
<td style="width: 20%"><%=countrycode%>
</td>
<td style="width: 20%"><%=district%>
</td>
<td style="width: 20%"><%=population%>
</td>
</tr>
<%}%>
</table>
<hr>
<%
if (xpage <= 6) {
if (xpage == 1) {
out.print("首页");
out.print(" ");
out.print(" ");
for (int i = 1; i <= 10; i++) {
out.println(" + i + ">" + i + "");
out.print(" ");
out.print(" ");
}
out.print(" ");
out.print(" ");
out.print(" + totalpages + ">尾页");
} else {
out.print("首页");
out.print(" ");
out.print(" ");
for (int i = 1; i <= 10; i++) {
out.println(" + i + ">" + i + "");
out.print(" ");
out.print(" ");
}
out.print(" ");
out.print(" ");
out.print(" + totalpages + ">尾页");
}
} else {
if (xpage == totalpages) {
out.print("首页");
out.print(" ");
out.print(" ");
for (int i = xpage - 5; i <= xpage + 4; i++) {
out.println(" + i + ">" + i + "");
out.print(" ");
out.print(" ");
}
out.print(" ");
out.print(" ");
out.print("尾页");
} else {
out.print("首页");
out.print(" ");
out.print(" ");
for (int i = xpage - 5; i <= xpage + 4; i++) {
out.println(" + i + ">" + i + "");
out.print(" ");
out.print(" ");
}
out.print(" ");
out.print(" ");
out.print(" + totalpages + ">尾页");
}
}
%>
</center>
<%
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace();
}
%>
</body>
</html>
实现效果
