getParameter在servlet中返回null

Question

我试图通过href将一个字符串从我的jsp传递给servlet。我用这个

<a href="MyServlet?select=title1"> Title1 </a>

然后在servlet中我试图用这个

获取select的值

String s = request.getParameter("select");

但它会返回null。这是为什么？谢谢！

编辑我发布了servlet的代码

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        String userOption = request.getAttribute("select");
        System.out.println("Select is:" + userOption);
        //in the console i get: Select is:null

Answer 1

那不应该是String userOption = request.getAttribute("select");

请理解属性不是参数

应为String userOption = request.getParameter("select");