pass value from jsp to servlet using <a href>

Question

I have jsp page -

<html>
<head>
</head>
<body>
      <a href="http://localhost:8080/MyProject/Servlet123?usrID=33333">Go to servlet</a>
</body>
</html>

And servlet -

@WebServlet("/Servlet123")
public class Servlet123 extends HttpServlet {
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // take the ID and retrive all his accounts..
        String usrID = request.getAttribute("usrID").toString();
          }

}

When I press on the link in the jsp page , it throws exception

java.lang.NullPointerException

in the line - String usrID = request.getAttribute("usrID").toString();

Other details - I use Apache Tomcat 7.0 Tomcat7 .

Answer 1

使用getParameter()而不是getAttribute() 。

pass value from jsp to servlet using <a href>

Question

1 answers

solution1
3 ACCPTED 2012-08-07 14:08:06

pass value from jsp to servlet using <a href>

Question

1 answers

solution1 3 ACCPTED 2012-08-07 14:08:06

solution1
3 ACCPTED 2012-08-07 14:08:06