Question

org.apache.jasper.JasperException: An exception occurred processing JSP page     /ShopLoginCheck2.jsp at line 60

57:         <br> You have entered the wrong credentials!
58:         <br> Press any key to go back to the Login page
59:         <%
60:         String takeIn = sc.next();
61:         session.invalidate();
62:         response.sendRedirect("WelcomeShop.jsp");
63:     }

在上面的代码中，由于显示的错误，我无法继续。

有什么建议可以摆脱它吗？

按要求添加更多代码：

    Scanner sc = new Scanner(System.in);
String s_id_string=(String)request.getParameter("s_id");
int s_id=0;
if(s_id_string !=null)
{
s_id = Integer.parseInt(s_id_string);
}
String s_name=(String)request.getParameter("s_name");
String s_password=(String)request.getParameter("s_password");
Statement stmt1 = con.createStatement();
ResultSet rs1 = stmt1.executeQuery("SELECT * FROM ShopSystem.Shop where s_id='"+s_id+"'     AND s_name='"+s_name+"' AND s_password='"+s_password+"'");
    if(rs1.next())
    {   
        if((s_id == rs1.getInt("s_id")) && (s_name.equals(rs1.getString("s_name"))) &&     (s_password.equals(rs1.getString("s_password"))))
        {                           
            session = request.getSession();
            session.setAttribute("s_id", s_id);
            session.setAttribute("s_name", s_name);
            session.setAttribute("s_password", s_password);
            response.sendRedirect("ShopMenu3.jsp");
        }
    }
    else
    {
        %>
        <br> You have entered the wrong credentials!
        <br> Press any key to go back to the Login page
        <%
        String takeIn = sc.next();
        session.invalidate();
        response.sendRedirect("WelcomeShop.jsp");
    }
sc.close();

并且我不打算以任何方式使用takeIn。 sc是一个Scanner对象

Answer 1

删除行String takeIn = sc.next();，因为您不打算使用此方法调用的返回值。导致该错误是因为Scanner对象sc中没有可用数据。见http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#next()。
此外，在致电Scanner.next()之前，您应始终使用Scanner.hasNext()方法检查是否有任何可用数据。在你的情况下是sc.hasNext()。

错误：HTTP状态500 - org.apache.jasper.JasperException，根本原因：java.util.NoSuchElementException

1 个答案: