我有jsp页面-
<html>
<head>
</head>
<body>
<a href="http://localhost:8080/MyProject/Servlet123?usrID=33333">Go to servlet</a>
</body>
</html>
和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();
}
}
当我按一下jsp页面中的链接时，它会引发异常
java.lang.NullPointerException
在该行中-
String usrID = request.getAttribute("usrID").toString();其他详细信息-我使用Apache Tomcat 7.0 Tomcat7。
最佳答案
使用getParameter()代替getAttribute()。