I think you may be misunderstanding me. In the situation where I'm
processing a request for a URL like
http://whatever.com/servlets?name1=&name2=someVal
getParameter (name1) should return either a null pointer or a blank string.
Right now, I'm getting the string value "null", ie a four character string
containing the characters 'n', 'u', 'l', 'l', as though somewhere someone
is doing an implicit string conversion (eg String s = "" + null will give s
= "null").
This is wrong, isn't it?
>HttpServletRequest.getParameter("name1") should return "" in the case of a
>URL like
http://whatever.com/servlets?name1=&name2=someVal
>
>Regardless, this is still problematic, since you probably want that value
>to be null.
>
>What I've done to get around this is provide my servlets with the
>following method:
>
>private String getParameter(HttpServletRequest req, String parameterName)
>throws NullParameterException {
> String value = req.getParameter(parameterName);
> if ( (value == null) || (value.equals("") )
> throw new NullParameterException(parameterName);
> return value;
>}
>
>And define a NullParameterException with a method like:
>public String getParameterName()
>and a constructor like the one used above:
>public NullParameterException(String parameterName)
>so that you can later find out which parameter was not passed. It comes
>in handy when you're checking for required form fields and the like.
>
>Hope this helps.
>
>-Rob
>
>On Tue, 13 Apr 1999, Jason Proctor wrote:
>
>> I'm seeing some weird behaviour with parameters that are passed to servlets
>> as blank strings, ie in a URL such as
>> http://machine/zone/servlet?param1=¶m2=. These parameters end up having
>> the value "null" (ie a 4-character string) rather than either a blank
>> string or a null pointer, which is what I would expect.
>>
>> Here's the code -
>>
>> Enumeration parmNames = inRequest.getParameterNames();
>>
>> while ( parmNames.hasMoreElements() )
>> {
>> String key = (String) parmNames.nextElement();
>>
>> String value = inRequest.getParameter( key );
>>
>> // value == "null" here
>> // in case where parameter is passed as ?name=&name=value
>> }
>>
>> Any ideas anyone? Thanks in advance.
>>
>>
>>
>>
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