<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="java.util.*" %>
<%
Connection con =null;
PreparedStatement pstmt=null;
List<String> list=null;
ResultSet rs=null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql", "xyz", "abc");
String strQuery = "SELECT batch_id,course_name FROM t_students_batch";
pstmt = con.prepareStatement(strQuery);
rs = pstmt.executeQuery();
list = new ArrayList<String>();
while(rs.next()) {
list.add(rs.getString("batch_id"));
list.add(rs.getString("course_name"));
}
}catch(Exception e) {
System.out.println("Error:: "+e.getMessage());
}
%>
<html>
<head>
<title>pay</title>
</head>
<body>
<form action="payment.jsp" method="get">
BatchId ::<select name="batchid">
<%
for (String temp : list) {
// how to i get this..
out.println("<option>"+ temp +"</option>");
}
%>
<input type="submit" value="continue" action="payment.jsp" />
</select>
</form>
</body>
</html>
输出:::显示选择列表
1 java
2 jsp
总列值显示这样
当我点击了 “1”,它的工作... 当我点击java或者jsp,它会显示一个空指针异常..
我想取java值为1的显示器,因为它是逻辑..
谢谢你sunny..it工作正常.. – user
你能解释我你做了什么。 – user
其实你是在列表中添加元素,如第一个是batch_id,第二个是course_name。所以当你做一个循环来获取batch_id时,我会添加i = i + 2。因为batch_id被存储在索引列表中,如1,3,5,7,.. – Sunny