纯JSP MySQL分页

<%@ page contentType="text/html; charset=UTF-8" %>
<%@ page language="java"%>
<%@ page import="java.sql.*"%>
<%!public int nullIntconvert(String str) {
        int num = 0;
        if (str == null) {
            str = "0";
        } else if ((str.trim()).equals("null")) {
            str = "0";
        } else if (str.equals("")) {
            str = "0";
        }
        try {
            num = Integer.parseInt(str);
        } catch (Exception e) {
        }
        return num;
    }%>
<%
    Connection conn = null;
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    conn = DriverManager.getConnection(
            "jdbc:mysql://localhost:3306/jpetstore", "root", "root");
    ResultSet rs1 = null;
    ResultSet rs2 = null;
    PreparedStatement ps1 = null;
    PreparedStatement ps2 = null;

    int showRows = 2;
    int totalRecords = 5;
    int totalRows = nullIntconvert(request.getParameter("totalRows"));
    int totalPages = nullIntconvert(request.getParameter("totalPages"));
    int iPageNo = nullIntconvert(request.getParameter("iPageNo"));
    int cPageNo = nullIntconvert(request.getParameter("cPageNo"));

    int startResult = 0;
    int endResult = 0;
    if (iPageNo == 0) {
        iPageNo = 0;
    } else {
        iPageNo = Math.abs((iPageNo - 1) * showRows);
    }
    String query1 = "SELECT SQL_CALC_FOUND_ROWS * FROM jpetstore.item  LIMIT "
            + iPageNo + "," + showRows + "";
    ps1 = conn.prepareStatement(query1);
    rs1 = ps1.executeQuery();

    String query2 = "SELECT FOUND_ROWS() as cnt";
    ps2 = conn.prepareStatement(query2);
    rs2 = ps2.executeQuery();
    if (rs2.next()) {
        totalRows = rs2.getInt("cnt");
    }
%>
<html>
    <h3>Pagination of JSP page</h3>
    <body>
        <form>
            <input type="hidden" name="iPageNo" value="<%=iPageNo%>"> <input
                type="hidden" name="cPageNo" value="<%=cPageNo%>"> <input
                type="hidden" name="showRows" value="<%=showRows%>">
            <table width="100%" cellpadding="0" cellspacing="0"  border="1">
                <tr>
                    <td>ItemID</td>
                    <td>ProductID</td>
                    <td>listPrice</td>
                    <td>unitCost</td>
                </tr>
                <%
                    while (rs1.next()) {
                %>
                <tr>
                    <td><%=rs1.getString("itemid")%></td>
                    <td><%=rs1.getString("productId")%></td>
                    <td><%=rs1.getDouble("listprice")%></td>
                    <td><%=rs1.getDouble("unitcost")%></td>
                </tr>
                <%
                    }
                %>


            </table>
            <%
                try {
                    if (totalRows < (iPageNo + showRows)) {
                        endResult = totalRows;
                    } else {
                        endResult = (iPageNo + showRows);
                    }
                    startResult = (iPageNo + 1);
                    totalPages = ((int) (Math.ceil((double) totalRows / showRows)));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            %>

            <div>
                <%
                    int i = 0;
                    int cPage = 0;
                    if (totalRows != 0) {
                        cPage = ((int) (Math.ceil((double) endResult
                                / (totalRecords * showRows))));

                        int prePageNo = (cPage * totalRecords)
                                - ((totalRecords - 1) + totalRecords);
                        if ((cPage * totalRecords) - (totalRecords) > 0) {
                %>
                <a
                    href="pagination.jsp?iPageNo=<%=prePageNo%>&cPageNo=<%=prePageNo%>">
                    &lt; Previous</a>
                    <%
                        }
                        for (i = ((cPage * totalRecords) - (totalRecords - 1)); i <= (cPage * totalRecords); i++) {
                            if (i == ((iPageNo / showRows) + 1)) {
                    %>
                <a href="pagination.jsp?iPageNo=<%=i%>"
                   style="cursor: pointer; color: red"><b><%=i%></b> </a>
                        <%
                        } else if (i <= totalPages) {
                        %>
                <a href="pagination.jsp?iPageNo=<%=i%>"><%=i%></a>
                <%
                        }
                    }
                    if (totalPages > totalRecords && i < totalPages) {
                %>
                <a href="pagination.jsp?iPageNo=<%=i%>&cPageNo=<%=i%>">
                    Next &gt;</a>
                    <%
                            }
                        }
                    %>
                <b>Rows <%=startResult%> - <%=endResult%> Total Rows <%=totalRows%>
                </b>
            </div>

        </form>
    </body>
</html>
<%
    try {
        if (ps1 != null) {
            ps1.close();
        }
        if (rs1 != null) {
            rs1.close();
        }

        if (ps2 != null) {
            ps2.close();
        }
        if (rs2 != null) {
            rs2.close();
        }

        if (conn != null) {
            conn.close();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
%>

create table if not exists item (
    itemid varchar(10) not null,
    productid varchar(10) not null,
    listprice decimal(10,2) null,
    unitcost decimal(10,2) null,
    supplier int null,
    status varchar(2) null,
    attr1 varchar(80) null,
    attr2 varchar(80) null,
    attr3 varchar(80) null,
    attr4 varchar(80) null,
    attr5 varchar(80) null,
primary key (itemid) )

INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-1','FI-SW-01',16.50,10.00,1,'P','Large');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-2','FI-SW-01',16.50,10.00,1,'P','Small');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-3','FI-SW-02',18.50,12.00,1,'P','Toothless');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-4','FI-FW-01',18.50,12.00,1,'P','Spotted');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-5','FI-FW-01',18.50,12.00,1,'P','Spotless');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-6','K9-BD-01',18.50,12.00,1,'P','Male Adult');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-7','K9-BD-01',18.50,12.00,1,'P','Female Puppy');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-8','K9-PO-02',18.50,12.00,1,'P','Male Puppy');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-9','K9-DL-01',18.50,12.00,1,'P','Spotless Male Puppy');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-10','K9-DL-01',18.50,12.00,1,'P','Spotted Adult Female');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-11','RP-SN-01',18.50,12.00,1,'P','Venomless');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-12','RP-SN-01',18.50,12.00,1,'P','Rattleless');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-13','RP-LI-02',18.50,12.00,1,'P','Green Adult');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-14','FL-DSH-01',58.50,12.00,1,'P','Tailless');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-15','FL-DSH-01',23.50,12.00,1,'P','With tail');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-16','FL-DLH-02',93.50,12.00,1,'P','Adult Female');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-17','FL-DLH-02',93.50,12.00,1,'P','Adult Male');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-18','AV-CB-01',193.50,92.00,1,'P','Adult Male');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-19','AV-SB-02',15.50, 2.00,1,'P','Adult Male');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-20','FI-FW-02',5.50, 2.00,1,'P','Adult Male');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-21','FI-FW-02',5.29, 1.00,1,'P','Adult Female');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-22','K9-RT-02',135.50, 100.00,1,'P','Adult Male');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-23','K9-RT-02',145.49, 100.00,1,'P','Adult Female');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-24','K9-RT-02',255.50, 92.00,1,'P','Adult Male');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-25','K9-RT-02',325.29, 90.00,1,'P','Adult Female');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-26','K9-CW-01',125.50, 92.00,1,'P','Adult Male');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-27','K9-CW-01',155.29, 90.00,1,'P','Adult Female');
INSERT INTO item (itemid, productid, listprice, unitcost, supplier, status, attr1) VALUES ('EST-28','K9-RT-01',155.29, 90.00,1,'P','Adult Female');

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