java分页代码:Java实用分页代码
来源: 发布时间:星期五, 2008年10月24日 浏览:161次 评论:0
代码如下：
//实体类代码
package Test;
public class UserInfo {
private int id;
private String name;
private int age;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
//数据库访问类代码
package Test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
public class UserDao {
public static ArrayList<UserInfo> getUsers(int pagesize, int pagenum) {
String sql = "select top " + pagesize + " * from userinfo"
+ " where id not in " + "(select top "
+ ((pagenum - 1) * pagesize) + " id from userinfo order by id)"
+ " order by id";
ArrayList<UserInfo> al = new ArrayList<UserInfo>();
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
Connection conn = null;
PreparedStatement pst = null;
ResultSet rs = null;
try {
conn = DriverManager.getConnection("jdbc:odbc:test");
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
while (rs.next()) {
UserInfo user = new UserInfo();
user.setId(rs.getInt("id"));
user.setName(rs.getString("name"));
user.setAge(rs.getInt("age"));
al.add(user);
}
} catch (SQLException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
} finally {
try {
if (rs != null)
rs.close();
if (pst != null)
pst.close();
if (conn != null)
conn.close();
} catch (SQLException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}
}
return al;
}
public static int getCount() {
String sql = "select count(*) from userinfo";
int count = 0;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
Connection conn = null;
PreparedStatement pst = null;
ResultSet rs = null;
try {
conn = DriverManager.getConnection("jdbc:odbc:test");
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
rs.next();
count = rs.getInt(1);
} catch (SQLException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
} finally {
try {
if (rs != null)
rs.close();
if (pst != null)
pst.close();
if (conn != null)
conn.close();
} catch (SQLException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}
}
return count;
}
}
//网页上分页代码
//采用电骡verycd网站上的css(blog.css.r12631和blog.css.r12631)
//请各位自行去verycd另存后查找
package Test;
public class Pager {
public static String getPager(int total,int pagesize,int pagenum)
{
int count = total/pagesize;
if (total%pagesize>0)
count++;
StringBuffer buf = new StringBuffer();
buf.append("<DIV class=\"pages-nav\" style=\"margin: 10px 7px 0px 0px;padding:0 0 20px 0px!important;padding-bottom:0;\">");
if (pagenum==1)
buf.append("<SPAN class=\"next\">« 上一页</SPAN>");
else
buf.append("<A href=\"?pagenum="+(pagenum-1)+"\" class=\"next\">上一页 »</A>");
int bound1 = ((pagenum-2)<=0)?1:(pagenum-2);
int bound2 = ((pagenum+2)>=count)?count:(pagenum+2);
for(int i=bound1;i<=bound2;i++)
{
if (i==pagenum)
buf.append("<SPAN class=\"current\">"+i+"</SPAN>");
else
buf.append("<a href='?pagenum="+i+"'>"+i+"</a>");
}
if (bound2<count)
buf.append("<SPAN>...</SPAN>");
if (pagenum==count)
buf.append("<SPAN class=\"next\">« 下一页</SPAN>");
else
buf.append("<A href=\"?pagenum="+(pagenum+1)+"\" class=\"next\">下一页 »</A>");
buf.append("</DIV>");
return buf.toString();
}
}
//JSP网页上的调用代码
//使用JSTL1.1
//采用电骡verycd网站上的css(blog.css.r12631和blog.css.r12631)
//请各位自行去verycd另存后查找
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@page import="Test.UserInfo"%>
<%@page import="Test.UserDao"%>
<%@page import="Test.Pager"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'MyJsp.jsp' starting page</title>
<LINK type="text/css" rel="stylesheet" media="all" href="global.css.r12653">
<LINK rel="stylesheet" href="blog.css.r12631" type="text/css" media="all">
</head>
<body>
<%
int pagesize = 3;
int pagenum = 1;
if (request.getParameter("pagenum") != null)
pagenum = Integer.parseInt(request.getParameter("pagenum"));
ArrayList<UserInfo> al = UserDao.getUsers(pagesize, pagenum);
request.setAttribute("users", al);
%>
<table>
<c:forEach items="${users}" var="user">
<tr>
<td>
<c:out value="${user.id }"></c:out>
</td>
<td>
<c:out value="${user.name }"></c:out>
</td>
<td>
<c:out value="${user.age }"></c:out>
</td>
</tr>
</c:forEach>
</table>
<br>
<%= Pager.getPager(UserDao.getCount(),pagesize,pagenum) %>
</body>
</html>
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