📄 delnews.jsp
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<%@ page contentType="text/html;charset=GBK" language="java" import="java.sql.*" errorPage="" %>
<%@ include file="conn.jsp"%>
<%
if(session.getAttribute("admin_name")==null){
;}else{
%>
<head>
<link href=../css.css rel=STYLESHEET type=text/css>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta http-equiv="Content-Language" content="zh-cn">
</head>
<%!
boolean IsInt(String NInt)
{
try {
int n;
n=Integer.parseInt(NInt);
return true;
}
catch(NumberFormatException e){
return false;
}
}
%>
<%
String action=request.getParameter("action");
if(action==null)
action="notdel";
if(action.equals("del")){
int news_id=Integer.parseInt(request.getParameter("news_id"));
sql="select * from news where news_id="+news_id+"";
rs=mdb.executeQuery(sql);
if(!rs.next())
response.sendRedirect("delnews.jsp");
else{
sql="delete from news where news_id="+news_id+"";
mdb.executeDelete(sql);
out.print("内容删除完毕<Br><a href=delnews.jsp>返回</a>");
}
}else{
%>
<table width="500" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td>
<div align="center">
<center>
<table border="1" width="550" cellspacing="0" bordercolor="#C0C0C0" style="border-collapse: collapse" cellpadding="0">
<%
String mypage;
int intpage=1;
mypage=request.getParameter("page");
if(mypage=="")
intpage=1;
if(!IsInt(mypage))
intpage=1;
if(IsInt(mypage))
intpage=Integer.parseInt(mypage);
if(intpage<1)
intpage=1;
mypage=Integer.toString(intpage);
sql="select * from news order by news_id DESC";
rs=mdb.executeQuery(sql);
if(!rs.next()){
%>
<tr bgcolor="#FFFFFF">
<td width="55">编号</td>
<td colspan="3">标题</td>
</tr>
<tr bgcolor="#FFFFFF">
<td colspan="4">没有内容</td>
</tr>
<%}else{
int PageSize =20; //设置每张网页显示两条记录
int ShowPage = 1; //设置欲显示的页数
int RowCount = 0; //ResultSet的记录数目
int PageCount = 0; //ResultSet分页后的总页数
int duoyu=0;
if(rs.next())
{
//建立ResultSet(结果集)对象，并执行SQL语句
rs.last(); //将指标移至最后一笔记录
RowCount=rs.getRow();
duoyu=RowCount % PageSize;
if(duoyu==0)
{
PageCount=RowCount/PageSize;
}
else{
PageCount=(RowCount-duoyu)/PageSize;
PageCount++;
}
// PageCount=((RowCount % PageSize) == 0?(RowCount/PageSize) : (RowCount/PageSize)+1);
//计算显示的页数
//String ToPage = request.getParameter("ToPage");
//if(ToPage==""){ToPage="1";}
//判断是否可正确取得ToPage参数,
//可取得则表示JSP网页应显示特定分页记录的语句
//if(ToPage!=""){
ShowPage=intpage; //取得指定显示的分页页数
//下面的if语句将判断用户输入的页数是否正确
if(ShowPage>PageCount)
{ //判断指定页数是否大于总页数, 是则设置显示最后一页
ShowPage=PageCount;
}
else if(ShowPage<=0)
{ //若指定页数小于0, 则设置显示第一页的记录
ShowPage = 1;
}
}
rs.absolute((ShowPage - 1) * PageSize + 1);
%>
<tr bgcolor="#6894d8">
<td width="55" bgcolor="#808080">
<div align="center"><font color="#FFFFFF">编号</font></div>
</td>
<td width="399" bgcolor="#808080">
<div align="center"><font color="#FFFFFF">标题</font></div>
</td>
<td colspan="2" bgcolor="#808080">
<div align="center"><font color="#FFFFFF">操作</font></div>
</td>
</tr>
<%int i=1;
rs.previous();
while(rs.next()&&i<=PageSize){
i++;
int news_id=rs.getInt("news_id");
String news_title=rs.getString("news_title");
%>
<tr bgcolor="#FFFFFF">
<td width="55" height="20"><%=news_id%></td>
<td width="399" height="20"><%=news_title%></td>
<td width="43" height="20">
<div align="center"><a href="delnews.jsp?news_id=<%=news_id%>&action=del">删除</a></div>
</td>
<td width="40" height="20">
<div align="center"><a href="editnews.jsp?news_id=<%=news_id%>">修改</a></div>
</td>
</tr>
<%}%>
</table>
</center>
</div>
</td>
</tr>
</table>
<div align="center">共<font color=red><%=PageCount%></font>页 第<%=intpage%>页 <font color=666666>
<%if(intpage-1>0){%>
<a href="delnews.jsp?page=<%=intpage-1%>">上一页</a>
<%}else{%>
<font color=666666>上一页</font>
<%}%>
<%if(intpage+1<=PageCount){%>
<a href="delnews.jsp?page=<%=intpage+1%>">下一页</a>
<%}else{%>
<font color=666666>下一页</font>
<%}%>
</font><br>
<%}
}
mdb.Close();
}
%>
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