将文本字段键设置为 jsp 变量并将其应用于 sql 查询

Question

我有一个显示客户信息的jsp

<s:textfield key="customer.firstname" required="true" readonly="true"/>
<s:textfield key="customer.lastname" required="true" readonly="true"/>
<s:textfield key="customer.loginid" required="true"  readonly="true"/>
<s:textfield key="customer.telephone" required="true"  readonly="true"/>

我试过了

  <c:set var = "customer_loginid" scope = "session" value = "${customer.loginid}"/>
  <c:out value = "${customer_loginid}"/>

可以按变量显示值。

然后我想用它从数据库中获取数据。

<%
connection = DriverManager.getConnection(connectionUrl+dbName, userId, 
password);
statement=connection.createStatement();
//String customerLoginid = ${customer_loginid};//It does not allow me to put the variable here
//also tried
//String customerLoginid = {String) ${customer_loginid};//It does not allow me to put the variable here
String customerLoginid = x; //how to put the variable here??

String sql = "select ordered_product from table2 where customerid ='"+customerLoginid+"'"
ResultSet resultSet = statement.executeQuery(sql)

while(resultSet.next())
{
   resultSet.getString("ordered_product")
}
resultSet.close();
statement.close();
%>

那么如何将${customer_loginid}放在jsp的sql查询中呢？感谢您的建议。谢谢。

Answer 1

因为您已经设置了会话范围

<c:set var = "customer_loginid" scope = "session" value = "${customer.loginid}"/>

你可以简单地得到价值。

  String customerLoginid = session.getAttribute("customer_loginid");