JSP分页实现-优快云博客

1、前端分页

2、后台（java）分页

3、数据库（oracle）分页

1.1、简单的jsp分页

int pageSize:每页显示多少条记录
int pageNow:希望显示第几页
int pageCount:一共有多少页
int rowCount:一共有多少条记录

获取总页数

if(rowCount%pageSize==0){
pageCount=rowCount/pageSize;
}else{
pageCount=rowCount/pageSize+1;
}

点击首页、上一页、下一页、尾页的行为
<a href="multipage.jsp?pageNow=1" >首页</a>
<a href="multipage.jsp?pageNow=<%pageNow+1%>" >下一页</a>
<a href="multipage.jsp?pageNow=<%pageNow-1%>" >上一页</a>
<a href="multipage.jsp?pageNow=<%pageCount%>" >尾页</a>

测试：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*"%>  
<html>  
    <head>  
        <title>hello</title>  
    </head>  
    <body>  
    <table border="1" spacing="2">  
<%!  
    public static final String DRIVER = "com.mysql.jdbc.Driver";  
    public static final String USER = "root";  
    public static final String PASS = "111122";  
    public static final String URL = "jdbc:mysql://localhost:3306/mysql"; 
    //自定义单页记录数量，总页数，当前页 
    int pageSize = 5;  
    int pageCount;  
    int pageNow = 1;  
%>  
<%  
    String user = null;  
    String pass = null;  
    try{  
        Class.forName(DRIVER);  
        Connection con = DriverManager.getConnection(URL,USER,PASS);  
        String sql = "SELECT * FROM help_topic";  
        PreparedStatement stat = con.prepareStatement(sql);  
        ResultSet rs = stat.executeQuery();  
        rs.last();  
        int rowCount = rs.getRow();  
        pageCount = (rowCount%pageSize==0)?(rowCount/pageSize):(rowCount/pageSize+1);  
        String now = request.getParameter("pageNow");  
        if(now==null){  
            pageNow=1;  
        }  
        pageNow = Integer.parseInt(now);   
        if(pageNow>=pageCount) pageNow = pageCount;  
        boolean flag = rs.absolute((pageNow-1)*pageSize+1);  
        int count = 0;  
          
        do{  
            if(count>=pageSize)break;  
            int empno = rs.getInt(1);  
            String name = rs.getString(2);  
            String description = rs.getString(4);  
            String url = rs.getString(6);  
            count++;  
            %>  
        <tr>  
            <td><%=empno%></td>  
            <td><%=name%></td>  
            <td><%=description%></td>  
            <td><%=url%></td>  
        </tr>  
            <%  
        }while(rs.next());  
        con.close();  
    }  
    catch(Exception e){  
          
    }  
%>  
</table>  
<a href = "page1.jsp?pageNow=1" >首页</a>  
<a href = "page1.jsp?pageNow=<%=pageNow-1%>" >上一页</a>  
<a href = "page1.jsp?pageNow=<%=pageNow+1%>" >下一页</a>  
<a href = "page1.jsp?pageNow=<%=pageCount%>" >尾页</a>  
第<%=pageNow%>页/共<%=pageCount%>页  
</body>  
</html>

ResultSet用法集锦：http://soft-development.iteye.com/blog/1420323

public boolean first(); 该方法的作用是将当前行定位到数据库记录集的第一行。
public boolean last(); 该方法的作用刚好和first()方法相反。
public boolean next(); 该方法的作用是将数据库游标向后移动一位，使得下一行成为当前行，当刚刚打开记录集对象时，数据库游标的位置在记录集的最前面，第一次使用next()方法将会使数据库游标定位到记录集的第一行，第二次使用next()方法将会使数据库游标定位到记录集的第二行，以此类推。

1.2、springmvc+mybatis+jsp端的分页