getParameter在servlet中返回null

Question

我想通过href从我的jsp传递一个字符串到servlet。我用这个

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

然后在servlet我想获得选择的值与此

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

但它返回null。这是为什么？谢谢！

编辑我张贴的servlet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

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

请理解属性不是参数

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