<%@ 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>
輸出:::顯示選擇列表
1 java
2 jsp
總列值顯示這樣
當我點擊了 「1」,它的工作... 當我點擊java或者jsp,它會顯示一個空指針異常..
我想取java值爲1的顯示器,因爲它是邏輯..
謝謝你sunny..it工作正常.. – user
你能解釋我你做了什麼。 – user
其實你是在列表中添加元素,如第一個是batch_id,第二個是course_name。所以當你做一個循環來獲取batch_id時,我會添加i = i + 2。因爲batch_id被存儲在索引列表中,如1,3,5,7,.. – Sunny