Code problem How to use a hyperlink to pass parameters Get parameters on this page Online

michael_zn

<% out.print ("<a href =\" searchnews.jsp? p = "+ i +"\">" + 2+ "</a>&nbsp;&nbsp;");%>

out.print (request.getParameter ("p")); (how is it null?)

zcty_cn

No way?

sunjingyao

Is it empty after you click on the link?

工藤新一

if ((String) session.getAttribute ("data") == "123");
Finally, do n’t have a semicolon, it ’s right to test it on my platform after removing it, the environment is the same as yours.

friday78249

On this page. . . <% = I%> isn't it?

impk2004

There are now three pages ① → ② → ③,
<% out.print ("<a href =\" searchnews.jsp? p = "+ i +"\">" + 2+ "</a>&nbsp;&nbsp;");%>

out.print (request.getParameter ("p")); (how is it null?)
Assuming these statements are on ②, the request built-in object here refers to the request sent by ① page to ② page.
In order to get the parameters from the hyperlink, it must be the request of ② page through the hyperlink to ③ page
Objects can only be obtained using request.getParameter ("p").