无法通过按钮使用url检索从jsp传递到控制器的值 [英] unable to retrieve the passed value from jsp to controller using url via a button

问题描述

我将href分配给按钮并将值传递给控制器​​

I am assigning href to a button and passing a value to the controller

1. JSP页面

1. JSP page

<td><a href="viewController?book_id=<%=vo.getBookId()%>"><input type="button" name="remove" value="DELETE"/></a>
</td>

在控制器中，我尝试使用以下方法来单击按钮时获取值:

In controller, I am trying to get the value when the button is clicked using:

if(request.getParameter("remove") !=null)
{
    int cart_id=(Integer)request.getSession(false).getAttribute("cartid");
    b_id = (String) request.getParameter("book_id");
    int bid=Integer.parseInt(b_id);
    System.out.println(bid);
}

这虽然我在URL中传递了book_id值，但仍打印了一个空值. 我想知道如何通过按钮在URL中传递值.

This prints a null value though I have passed book_id value in the URL. I want to know how can I get the value passed in the URL via the button.

推荐答案

您不能将[a]标记与这样的[input]标记结合使用. 尝试使用带有隐藏输入的表单:

You can't combine [a] tag with an [input] tag like that. Try using a form instead with hidden inputs:

<form action=viewController>
<input type=hidden name=remove value=delete>
<input type=hidden name=book_id value=<%=vo.getBookId()%>>
<input type=submit value='Delete'>
</form>

结果网址为:viewController?remove=delete&book_id=...

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