Check if string/object null in query string
If I'm passing a parameter in a query string:
test.jsp?var1=value1
and on the recieving page I get:
String var1 = request.getParameter("var1
How do I check if no parameter was passed? For example if this happens:
test.jsp
this checks
if (var1 != null) {}
but what about this case with no value in the query string???
test.jsp?var1=
I thought
if (var1 != "") {}
but that doesn't work, what's the check?
test.jsp?var1=value1
and on the recieving page I get:
String var1 = request.getParameter("var1
How do I check if no parameter was passed? For example if this happens:
test.jsp
this checks
if (var1 != null) {}
but what about this case with no value in the query string???
test.jsp?var1=
I thought
if (var1 != "") {}
but that doesn't work, what's the check?
unfortunately its also null.
in your application, you shoudl thread test.jsp?var1= the same as test.jsp
I always do this check:
if( var1 != null && var1.length() > 0 )
I always do this check:
if( var1 != null && var1.length() > 0 )
ASKER
I tried the null check and it fails for the second case!
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or
if( !var1.equals("") )
it's the same as:
var1.length() > 0
if( !var1.equals("") )
it's the same as:
var1.length() > 0