📄 reader.jsp
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<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="../error/error.jsp" %>
<!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=gb2312">
<title>图书评比</title>
<jsp:useBean id="books" class="BookShop.MyDb" scope="page"/>
<link rel="stylesheet" type="text/css" href="../css/bs.css"/>
<script language="javascript" src="../css/bs.js"></script>
<%!
String idbook,bookname,sqlu,tidbook,host;
int vote;
%>
</head>
<body topmargin="0" >
<form action="" method="post">
<p> </p>
<table width="556" border="1" align="center" cellpadding="-1" cellspacing="0" bordercolor="#FFFFFF" bordercolorlight="#0066ff" bordercolordark="#FFFFFF" >
<caption>
<div class="two">图书评比</div>
<p></p>
</caption>
<tr>
<td width="61" height="22" align="center">投票</td>
<td width="127" align="center">图书编号</td>
<td width="238" align="center">图书名称</td>
<td width="120" align="center">票数</td>
</tr>
<%
String bookvote=(String)request.getParameter("radiobutton");
if(bookvote!=null){
host=(String)request.getRemoteHost();
if(session.getAttribute("host")!=null){
response.sendRedirect("../error/errorpage.jsp");
session.setAttribute("error","您已经投过票了");
}else{
session.setAttribute("host",host);
String sqls5="SELECT vote FROM feedback WHERE idbook='"+bookvote+"'";
Statement stmt5=books.getstmtread();
ResultSet rs5=stmt5.executeQuery(sqls5);
if(rs5.next()){
int tempvote=rs5.getInt(1);
tempvote++;
books.close();
String sqlu6="UPDATE feedback SET vote="+tempvote+" WHERE idbook='"+bookvote+"'";
Statement stmt6=books.getstmtread();
tempvote=stmt6.executeUpdate(sqlu6);
if(tempvote>0)
request.setAttribute("read","投票成功");
books.close();
}else{
books.close();
}
}//host
}//bookvote
//统计发布书
String sqlu="SELECT idbook from books where idbook not in (select idbook from feedback) and active=1";
Statement stmt1=books.getstmtread();
ResultSet rs1=stmt1.executeQuery(sqlu);
//没有图书发布时
if(!rs1.next()){
books.close();
String sqls4="SELECT idbook FROM feedback";
Statement stmt4=books.getstmtread();
ResultSet rs4=stmt4.executeQuery(sqls4);
if(!rs4.next()){
String sqlu2="SELECT idbook FROM books WHERE active=1";
Statement stmt2=books.getstmtread();
ResultSet rs2=stmt2.executeQuery(sqlu2);
while(rs2.next()){
String sqli3="INSERT INTO feedback(idbook) VALUES('"+rs2.getString(1)+"')";
Statement stmt3=books.getstmt();
stmt3.executeUpdate(sqli3);
books.close();
}
books.close();
}//rs4
books.close();
}else{
//有发布图书时
rs1.previous();
while(rs1.next()){
String sqli="INSERT INTO feedback(idbook) VALUES('"+rs1.getString(1)+"')";
Statement stmt2=books.getstmt();
stmt2.executeUpdate(sqli);
books.close();
}
books.close();
}
//发布书投票
String sqls="SELECT b.idbook,bookname,b.vote FROM books AS a,feedback AS b WHERE active=1 AND a.idbook=b.idbook";
Statement stmt=books.getstmtread();
ResultSet rs=stmt.executeQuery(sqls);
if(!rs.next()){
%>
<tr>
<td height="40" colspan="4" align="center" class="red12">暂无发布新图书</td>
</tr>
<%
books.close();
}
rs.previous();
while(rs.next()){
idbook=rs.getString(1);
bookname=rs.getString(2);
vote=rs.getInt(3);
idbook=books.outStr(idbook);
bookname=books.outStr(bookname);
%>
<tr>
<td width="61" height="22" align="center">
<input type="radio" name="radiobutton" value="<%=idbook%>"></td>
<td width="127" height="22" align="center"><%=idbook%></td>
<td width="238" align="center"><%=bookname%></td>
<td width="120" align="center"><%=vote%>
</td>
</tr>
<%
}
books.close();
pageContext.removeAttribute("books");
%>
</table>
<table width="556" border="0" align="center">
<tr>
<td width="573" height="58" align="center" valign="bottom"><input type="submit" name="Submit" value="投票">
</td>
</tr>
<tr>
<td height="44" align="right" valign="bottom" class="red12"><%
if(request.getAttribute("read")!=null){
out.print(request.getAttribute("read"));
request.removeAttribute("read");
}
%></td>
</tr>
<tr>
<td height="37" align="right" valign="bottom" class="red12"> 以上我们推荐的图书，请在这里选出您最喜爱的书！！！</td>
</tr>
</table>
</form>
</body>
</html>
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