I am writing a JSP page and why my request.getAttribute return null?

Question

I use this js function to submit my form.

function updateAction(obj,tableName){
  inputs=obj.parentNode.parentNode.parentNode.parentNode.parentNode.getElementsByTagName("input");
  newValues="";
  for(i=0;i<inputs.length;i++){
    newValues+=inputs[i].value+",";
  }
  obj.parentNode.parentNode.parentNode.parentNode.parentNode.action="SimpleServlet?action=update&tableName="+tableName+"&newValue="+newValues;
  obj.parentNode.parentNode.parentNode.parentNode.parentNode.submit();
}

and the action of form has correctly been changed to

"http://localhost:8081/SimpleWeb/SimpleServlet?action=delete&tableName=stude…01199203110000,200301,%E5%85%83%E5%AE%9D,%E7%94%B7,3,yb,424551199104010000,"

and in my servlet

String action=(String)request.getAttribute("action");
String tableName=(String)request.getAttribute("tableName");
System.out.print(request.getAttribute("tableName"));
System.out.print(request.getAttribute("action"));
System.out.print(request.getAttribute("newValue"));
String[] newValues=((String)request.getAttribute("newValue")).split(",");

but they are still null,why?

score 0 · Accepted Answer · answered Jun 11 '15 at 04:08

0

If you are sending your parameters by URL try using request.getParameter(name);

answered Jun 11 '15 at 04:08

Jean Cedron

702
3
14

@Stillily are you still getting null values? – Jean Cedron Jun 11 '15 at 04:18
1

Ok, got the right values now, thx :-) – Stillily Jun 11 '15 at 04:25

score 0 · Answer 2 · answered Jun 11 '15 at 04:14

0

You are sending parameters, try request.getParameter:

String action = request.getParameter("action");

request.getAttribute is used to get the attribute set on the server side using request.setAttribute.

answered Jun 11 '15 at 04:14

Got the right values now, thx :-) – Stillily Jun 11 '15 at 04:26

I am writing a JSP page and why my request.getAttribute return null?

2 Answers2