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[BBS] ShowArticleFlat.jsp 08 、下拉条

BBS

<%@ page language="java" contentType="text/html; charset=gbk"
    pageEncoding="gbk"%>
<%@ page import="java.sql.*"%>


<%
    int pageSize = 3;

    String strPageNo = request.getParameter("pageNo");
    int pageNo;
    if (strPageNo == null || strPageNo.equals("")) {
        pageNo = 1;
    } else {
        try {
            pageNo = Integer.parseInt(strPageNo.trim());
        } catch (NumberFormatException e) {
            pageNo = 1;
        }
        if (pageNo <= 0)
            pageNo = 1;
    }

    Class.forName("com.mysql.jdbc.Driver");
    String url = "jdbc:mysql://localhost/bbs?user=root&password=root";
    Connection conn = DriverManager.getConnection(url);

    Statement stmtCount = conn.createStatement();
    ResultSet rsCount = stmtCount
            .executeQuery("select count(*) from article where pid = 0");
    rsCount.next();
    int totalRecords = rsCount.getInt(1);

    int totalPages = totalRecords % pageSize == 0 ? totalRecords
            / pageSize : totalRecords / pageSize + 1;
    if (pageNo > totalPages)
        pageNo = totalPages;

    int startPos = (pageNo - 1) * pageSize;

    Statement stmt = conn.createStatement();
    ResultSet rs = stmt
            .executeQuery("select * from article where pid = 0 order by pdate desc limit "
                    + startPos + "," + pageSize);
%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<title>Insert title here</title>
</head>
<body>
    <a href="Post.jsp">发表新帖</a>

    <table border="1">

        <%
            while (rs.next()) {
        %>
        <tr>
            <td><%=rs.getString("title")%></td>
        </tr>
        <%
            }
            rs.close();
            stmt.close();
            conn.close();
        %>
    </table>

    共<%=totalPages%>页 第<%=pageNo%>页
    <a href="ShowArticleFlat.jsp?pageNo=<%=pageNo - 1%>"> < </a>
        
    <a href="ShowArticleFlat.jsp?pageNo=<%=pageNo + 1%>"> > </a>

    <form name="form1" action="ShowArticleFlat.jsp">
        <select name="pageNo" onchange="document.form1.submit()">
            <%
                for (int i = 1; i <= totalPages; i++) {  // 下拉条
            %>
            <option value=<%=i%> <%=(pageNo == i) ? "selected" : ""%>>
                第<%=i%>页
                <%
                }
            %>
            
        </select>
    </form>

    <form name="fom2" action="ShowArticleFlat.jsp">
        <input type=text size=4 name="pageNo" value=<%=pageNo%> /> <input
            type="submit" value="go" />
    </form>

</body>

</html>

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原文地址：https://www.cnblogs.com/robbychan/p/3786844.html