How to make sure there is not any parameter in the url?

Question

I know how to make sure if a specific parameter exists in the url. I would like to make sure there is not any parameter in the url not just a specified one. How can I accomplish this? I have a long list of parameters and it looks like inefficient to have a list of conditions for all of them.

Sample URL is: www.domain.com/Product/UniqueId

As each product has many unique parameters, users might reach product pages through, unique code,unique supplier, unique sig, unique pod etc of the products.

For example:

www.domain.com/Product/UniqueId?code=uniqueCode
www.domain.com/Product/UniqueId?sig=uniqueSig
www.domain.com/Product/UniqueId?pod=uniquepod
www.domain.com/Product/UniqueId?circle=circleNumber&location=Location&color=Color

The questions that I found relevant but not useful in my case were 1,2,3,4

I need to do such testing in JSP not Java.

Answer 1

This works out a bit easier with the URI class:

import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;

public class UrlTest2
{

   public static void main( String[] args )
           throws MalformedURLException, URISyntaxException
   {
      URI url = new URI( "www.domain.com/Product/UniqueId" );
      System.out.println( url.getQuery() );  // prints "null"
      URI url2 = new URI( "www.domain.com/Product/UniqueId?pod=uniquepod" );
      System.out.println( url2.getQuery() );  // prints "pod=uniquepod"
   }
}

So if getQuery() returns null there are no parameters. Otherwise, there are.

Regarding your edit: Well, I don't really recommend putting code inside a JSP. It's consider bad practice nowadays.

But if you must, it looks like you can ask for all of the parameters and if the result is 0, there weren't any.

<%
   Map params = request.getParameterMap();
   boolean noParams = (params.getSize() == 0);
%>

JSP code is untested, but should give you the idea. You can then use the boolean noParams later in the JSP code.

Answer 2

Followup

With the new requirement that it has to be done in JSP, even though the Spring handler code listed in the original answer below could add a Model attribute with the relevant information, here is how to do that.

Similar two ways as below:

<!-- Use the parameter Map -->
<c:if test="${empty param}">
  <!-- no query parameters given -->
</c:if>

<!-- Use the request object -->
<c:if test="${pageContext.request.queryString == null}">
  <!-- no query parameters given -->
</c:if>

---

Original Answer

You tagged spring-mvc, so that means you have something like this (would have been nice if you had posted it):

@Controller
public class ProductController {

    @RequestMapping("/Product/UniqueId")
    public String uniqueId(Model model,
                           @RequestParam(path="code"    , required=false) String code,
                           @RequestParam(path="sig"     , required=false) String sig,
                           @RequestParam(path="pod"     , required=false) String pod,
                           @RequestParam(path="circle"  , required=false) String circle,
                           @RequestParam(path="location", required=false) String location,
                           @RequestParam(path="color"   , required=false) String color) {
        // code here
    }
}

Here are two ways of checking for "no query parameters":

// Get all parameters in a Map
public String uniqueId(Model model,
                       ...,
                       @RequestParam Map<String, String> allParams) {
    if (allParams.isEmpty()) {
        // no query parameters given
    }
    // code here
}

// Use the request object
public String uniqueId(Model model,
                       ...,
                       HttpServletRequest request) {
    if (request.getQueryString() == null) {
        // no query parameters given
    }
    // code here
}

You might want to check this link for all the various types of parameters that Spring can give you:
http://docs.spring.io/spring-framework/docs/current/spring-framework-reference/html/mvc.html#mvc-ann-arguments