CODEWITHSUNDEEP
javaurltomcatservletspath
Alan
Alan

Reputation: 15

what's different between servlet url path and parameter?

What's the difference between localhost/user/user123, localhost/user?user=user123 and localhost/?user=user123?

How to get the parameter user123 from a URL localhost/user/user123 in servlet?

Thanks in advance

Upvotes: 0

Views: 2823

Answers (5)

Sudhakar
Sudhakar

Reputation: 4873

You can parse from the getPathInfo() of HttpServletRequest Object.

sample code

String urlPath = request.getPathInfo();

System.out.println("" + urlPath.substring(urlPath.lastIndexOf("/"), urlPath.length()- 1));

Upvotes: 3

rbobin
rbobin

Reputation: 39

  • localhost/user/user123 - this url will be handled by pattern /user/user123
  • localhost/user?user=user123 - this url will be handled by pattern /user, with user parameter set to user123 (for GET request)
  • localhost/?user=user123 - this url will be handled by pattern / with user parameter set to user123 (again, for GET)

I don't know how to retrieve user123 from url localhost/user/user123 with pure servlets, but it's pretty easy with web MVC frameworks. Spring example: 

@Controller
@RequestMapping("/user")
public class Controller {
    @RequestMapping(value = "/{user}")
    public String getUser((@PathVariable String user) {
        //here variable "user" is available and set to "user123" in your case
    }
}

Upvotes: 0

ssn771
ssn771

Reputation: 1270

Generally you pass parameters like 

/localhost/Servlet?parameter1=one

or for a JSP

/localhost/mypage.jsp?parameter1=one

In a servlet you can access the parameters by using the request object. So generally like this:

String parameter1 = request.getParameter("parameter1");

Here is some detail on getParameter for HttpServletRequest

Hope this helps.

Upvotes: 0

gaborsch
gaborsch

Reputation: 15758

These all are accessible from Servlet API. Check HttpServletRequest, you can access all information from there.

The actual values may differ how your webapp was deployed, but usually

  • localhost is the Context Path
  • the String after that is the Servlet PAth
  • the parameters after the ? is the Query String - you have to parse it, if you want to use

Upvotes: 0

Khoa Nghiem
Khoa Nghiem

Reputation: 315

localhost/user/user123 looks like a RESTful way to identify a resource.

The two others aren't, I think.

Upvotes: 0

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