Rewriting getAttribute() scriptlet as a JSTL in JSP/HTML?
0
I have a scriptlet within my JSP page that gets an attribute "username" passed from a previous serlvet. The scriptlet validates if the "username" attribute was set, if not it denies access to homepage and instead redirects to the login page:
<%
String validUser = (String) session.getAttribute("username");
if (validUser == null){
session.setAttribute("errorMsg", "Access Denied: Please login to access this page");
session.setAttribute("username", "");
response.sendRedirect("LoginFormError.jsp");
}
%>
Since scriptlets in JSP/HTML code is not ideal, how do I go about re-writing this scriptlet as a JSTL instead?
EDIT:
Ok, so far here's what I've got:
<c:set var="validUser" value='${param.username}' />
<c:if test = "${validUser == null"}
<c:set var="errorMsg" value="${'Access Denied: Please login to access this page'}"/>
<c:set var="username" value=""/>
<c:redirect url="LoginFormError.jsp"/>
</c:if>
Are the getAttribute() and setAttribute() done right?
java jsp jstl scriptlet getattribute
asked Nov 20 '18 at 23:48
James McTyre
535
add a comment |
0
I have a scriptlet within my JSP page that gets an attribute "username" passed from a previous serlvet. The scriptlet validates if the "username" attribute was set, if not it denies access to homepage and instead redirects to the login page:
<%
String validUser = (String) session.getAttribute("username");
if (validUser == null){
session.setAttribute("errorMsg", "Access Denied: Please login to access this page");
session.setAttribute("username", "");
response.sendRedirect("LoginFormError.jsp");
}
%>
Since scriptlets in JSP/HTML code is not ideal, how do I go about re-writing this scriptlet as a JSTL instead?
EDIT:
Ok, so far here's what I've got:
<c:set var="validUser" value='${param.username}' />
<c:if test = "${validUser == null"}
<c:set var="errorMsg" value="${'Access Denied: Please login to access this page'}"/>
<c:set var="username" value=""/>
<c:redirect url="LoginFormError.jsp"/>
</c:if>
Are the getAttribute() and setAttribute() done right?
java jsp jstl scriptlet getattribute
asked Nov 20 '18 at 23:48
James McTyre
535
add a comment |
0
0
0
I have a scriptlet within my JSP page that gets an attribute "username" passed from a previous serlvet. The scriptlet validates if the "username" attribute was set, if not it denies access to homepage and instead redirects to the login page:
<%
String validUser = (String) session.getAttribute("username");
if (validUser == null){
session.setAttribute("errorMsg", "Access Denied: Please login to access this page");
session.setAttribute("username", "");
response.sendRedirect("LoginFormError.jsp");
}
%>
Since scriptlets in JSP/HTML code is not ideal, how do I go about re-writing this scriptlet as a JSTL instead?
EDIT:
Ok, so far here's what I've got:
<c:set var="validUser" value='${param.username}' />
<c:if test = "${validUser == null"}
<c:set var="errorMsg" value="${'Access Denied: Please login to access this page'}"/>
<c:set var="username" value=""/>
<c:redirect url="LoginFormError.jsp"/>
</c:if>
Are the getAttribute() and setAttribute() done right?
java jsp jstl scriptlet getattribute
asked Nov 20 '18 at 23:48
James McTyre
535
I have a scriptlet within my JSP page that gets an attribute "username" passed from a previous serlvet. The scriptlet validates if the "username" attribute was set, if not it denies access to homepage and instead redirects to the login page:
<%
String validUser = (String) session.getAttribute("username");
if (validUser == null){
session.setAttribute("errorMsg", "Access Denied: Please login to access this page");
session.setAttribute("username", "");
response.sendRedirect("LoginFormError.jsp");
}
%>
Since scriptlets in JSP/HTML code is not ideal, how do I go about re-writing this scriptlet as a JSTL instead?
EDIT:
Ok, so far here's what I've got:
<c:set var="validUser" value='${param.username}' />
<c:if test = "${validUser == null"}
<c:set var="errorMsg" value="${'Access Denied: Please login to access this page'}"/>
<c:set var="username" value=""/>
<c:redirect url="LoginFormError.jsp"/>
</c:if>
Are the getAttribute() and setAttribute() done right?
java jsp jstl scriptlet getattribute
java jsp jstl scriptlet getattribute
asked Nov 20 '18 at 23:48
James McTyre
535
asked Nov 20 '18 at 23:48
James McTyre
535
edited Nov 21 '18 at 0:42
asked Nov 20 '18 at 23:48
James McTyre
535
asked Nov 20 '18 at 23:48
James McTyre
535
asked Nov 20 '18 at 23:48
James McTyre
535
535
add a comment |
add a comment |
1 Answer
1
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oldest
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0
Good to see you doing this, You can do using the jstl/core taglib
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:if test="${sessionScope.username == null}">
<c:redirect url="LoginFormError.jsp" />
</c:if>
answered Nov 21 '18 at 0:27
Scary Wombat
35k32252
I did an edit before I saw your answer. I'm wondering if${param.attr["username"]}is equivalent togetAttribute("username")?
– James McTyre
Nov 21 '18 at 0:37
I thought theusernamewas a session variable as per your original post. Why don't you try what I have posted?
– Scary Wombat
Nov 21 '18 at 0:40
Ah, yes. Sorry about that, I was following a JSTL guide that hadattras the session variable. Yes,usernameis my correct variable.
– James McTyre
Nov 21 '18 at 0:42
What's the difference between${param.username}and${sessionScope.username}? A contributor suggests usingparamaccording to his answer here (2nd answer): stackoverflow.com/questions/4912690/…
– James McTyre
Nov 21 '18 at 0:45
Yes, that was my understanding i.e.usernamewould be part of the queryString, but your question posted it asString validUser = (String) session.getAttribute("username");which is a session variable. Only you can say which is correct. But anyway, please modify my answer as per your requirements.
– Scary Wombat
Nov 21 '18 at 0:47
|
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1 Answer
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active
oldest
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1 Answer
1
active
oldest
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0
Good to see you doing this, You can do using the jstl/core taglib
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:if test="${sessionScope.username == null}">
<c:redirect url="LoginFormError.jsp" />
</c:if>
answered Nov 21 '18 at 0:27
Scary Wombat
35k32252
I did an edit before I saw your answer. I'm wondering if${param.attr["username"]}is equivalent togetAttribute("username")?
– James McTyre
Nov 21 '18 at 0:37
I thought theusernamewas a session variable as per your original post. Why don't you try what I have posted?
– Scary Wombat
Nov 21 '18 at 0:40
Ah, yes. Sorry about that, I was following a JSTL guide that hadattras the session variable. Yes,usernameis my correct variable.
– James McTyre
Nov 21 '18 at 0:42
What's the difference between${param.username}and${sessionScope.username}? A contributor suggests usingparamaccording to his answer here (2nd answer): stackoverflow.com/questions/4912690/…
– James McTyre
Nov 21 '18 at 0:45
Yes, that was my understanding i.e.usernamewould be part of the queryString, but your question posted it asString validUser = (String) session.getAttribute("username");which is a session variable. Only you can say which is correct. But anyway, please modify my answer as per your requirements.
– Scary Wombat
Nov 21 '18 at 0:47
|
show 1 more comment
0
Good to see you doing this, You can do using the jstl/core taglib
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:if test="${sessionScope.username == null}">
<c:redirect url="LoginFormError.jsp" />
</c:if>
answered Nov 21 '18 at 0:27
Scary Wombat
35k32252
I did an edit before I saw your answer. I'm wondering if${param.attr["username"]}is equivalent togetAttribute("username")?
– James McTyre
Nov 21 '18 at 0:37
I thought theusernamewas a session variable as per your original post. Why don't you try what I have posted?
– Scary Wombat
Nov 21 '18 at 0:40
Ah, yes. Sorry about that, I was following a JSTL guide that hadattras the session variable. Yes,usernameis my correct variable.
– James McTyre
Nov 21 '18 at 0:42
What's the difference between${param.username}and${sessionScope.username}? A contributor suggests usingparamaccording to his answer here (2nd answer): stackoverflow.com/questions/4912690/…
– James McTyre
Nov 21 '18 at 0:45
Yes, that was my understanding i.e.usernamewould be part of the queryString, but your question posted it asString validUser = (String) session.getAttribute("username");which is a session variable. Only you can say which is correct. But anyway, please modify my answer as per your requirements.
– Scary Wombat
Nov 21 '18 at 0:47
|
show 1 more comment
0
0
0
Good to see you doing this, You can do using the jstl/core taglib
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:if test="${sessionScope.username == null}">
<c:redirect url="LoginFormError.jsp" />
</c:if>
answered Nov 21 '18 at 0:27
Scary Wombat
35k32252
Good to see you doing this, You can do using the jstl/core taglib
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:if test="${sessionScope.username == null}">
<c:redirect url="LoginFormError.jsp" />
</c:if>
answered Nov 21 '18 at 0:27
Scary Wombat
35k32252
answered Nov 21 '18 at 0:27
Scary Wombat
35k32252
answered Nov 21 '18 at 0:27
Scary Wombat
35k32252
answered Nov 21 '18 at 0:27
Scary Wombat
35k32252
35k32252
I did an edit before I saw your answer. I'm wondering if${param.attr["username"]}is equivalent togetAttribute("username")?
– James McTyre
Nov 21 '18 at 0:37
I thought theusernamewas a session variable as per your original post. Why don't you try what I have posted?
– Scary Wombat
Nov 21 '18 at 0:40
Ah, yes. Sorry about that, I was following a JSTL guide that hadattras the session variable. Yes,usernameis my correct variable.
– James McTyre
Nov 21 '18 at 0:42
What's the difference between${param.username}and${sessionScope.username}? A contributor suggests usingparamaccording to his answer here (2nd answer): stackoverflow.com/questions/4912690/…
– James McTyre
Nov 21 '18 at 0:45
Yes, that was my understanding i.e.usernamewould be part of the queryString, but your question posted it asString validUser = (String) session.getAttribute("username");which is a session variable. Only you can say which is correct. But anyway, please modify my answer as per your requirements.
– Scary Wombat
Nov 21 '18 at 0:47
|
show 1 more comment
I did an edit before I saw your answer. I'm wondering if${param.attr["username"]}is equivalent togetAttribute("username")?
– James McTyre
Nov 21 '18 at 0:37
I thought theusernamewas a session variable as per your original post. Why don't you try what I have posted?
– Scary Wombat
Nov 21 '18 at 0:40
Ah, yes. Sorry about that, I was following a JSTL guide that hadattras the session variable. Yes,usernameis my correct variable.
– James McTyre
Nov 21 '18 at 0:42
What's the difference between${param.username}and${sessionScope.username}? A contributor suggests usingparamaccording to his answer here (2nd answer): stackoverflow.com/questions/4912690/…
– James McTyre
Nov 21 '18 at 0:45
Yes, that was my understanding i.e.usernamewould be part of the queryString, but your question posted it asString validUser = (String) session.getAttribute("username");which is a session variable. Only you can say which is correct. But anyway, please modify my answer as per your requirements.
– Scary Wombat
Nov 21 '18 at 0:47
I did an edit before I saw your answer. I'm wondering if
${param.attr["username"]} is equivalent to getAttribute("username")?– James McTyre
Nov 21 '18 at 0:37
I did an edit before I saw your answer. I'm wondering if
${param.attr["username"]} is equivalent to getAttribute("username")?– James McTyre
Nov 21 '18 at 0:37
I thought the
username was a session variable as per your original post. Why don't you try what I have posted?– Scary Wombat
Nov 21 '18 at 0:40
I thought the
username was a session variable as per your original post. Why don't you try what I have posted?– Scary Wombat
Nov 21 '18 at 0:40
Ah, yes. Sorry about that, I was following a JSTL guide that had
attr as the session variable. Yes, username is my correct variable.– James McTyre
Nov 21 '18 at 0:42
Ah, yes. Sorry about that, I was following a JSTL guide that had
attr as the session variable. Yes, username is my correct variable.– James McTyre
Nov 21 '18 at 0:42
What's the difference between
${param.username} and ${sessionScope.username}? A contributor suggests using param according to his answer here (2nd answer): stackoverflow.com/questions/4912690/…– James McTyre
Nov 21 '18 at 0:45
What's the difference between
${param.username} and ${sessionScope.username}? A contributor suggests using param according to his answer here (2nd answer): stackoverflow.com/questions/4912690/…– James McTyre
Nov 21 '18 at 0:45
Yes, that was my understanding i.e.
username would be part of the queryString, but your question posted it as String validUser = (String) session.getAttribute("username"); which is a session variable. Only you can say which is correct. But anyway, please modify my answer as per your requirements.– Scary Wombat
Nov 21 '18 at 0:47
Yes, that was my understanding i.e.
username would be part of the queryString, but your question posted it as String validUser = (String) session.getAttribute("username"); which is a session variable. Only you can say which is correct. But anyway, please modify my answer as per your requirements.– Scary Wombat
Nov 21 '18 at 0:47
|
show 1 more comment
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