教师投票系统（JSP+MySQL）

display.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="gb2312"%>

<html>

<body>

<table align="center">

<caption>欢迎给老师投票</caption>

<tr bgcolor="yellow">

<td>编号</td>

<td>姓名</td>

<td>得票数</td>

<td>投票</td>

</tr>

<%

Class.forName("com.mysql.jdbc.Driver");

Connection conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/school","root","laifu1990");

Statement stat=conn.createStatement();

String sql="select teacherno,teachername,vote from t_vote";

ResultSet rs=stat.executeQuery(sql);

while(rs.next())

{

String teacherno=rs.getString("teacherno");

String teachername=rs.getString("teachername");

int vote=rs.getInt("vote");

%>

<tr bgcolor="pink">

<td><%=teacherno %></td>

<td><%=teachername %></td>

<td><img  src="img/bar.jpg" width="<%=vote %>>" height="10">

<%=vote%></td>

<td><a href="vote.jsp?teacherno=<%=teacherno%>">投票</a></td>

</tr>

<%

}

stat.close();

conn.close();

%>

</table>

</body>

</html>

vote.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="gb2312"%>

<html>

<body>

<%

String teacherno = request.getParameter("teacherno");

Class.forName("com.mysql.jdbc.Driver");

Connection conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/school","root","laifu1990");

String sql="update t_vote set vote=vote+1 where teacherno=?";

PreparedStatement ps=conn.prepareStatement(sql);

ps.setString(1, teacherno);

ps.executeUpdate();

ps.close();

conn.close();

%>

<jsp:forward page="display.jsp"></jsp:forward>

</body>

</html>