create two method for same url pattern with different arguments

You can use the params parameter to filter by HTTP parameters. In your case it would be something like:

@RequestMapping(value = "/searchUser", params = "userID")
public String searchUserById(@RequestParam long userID, Model model) {
  // ...
}

@RequestMapping(value = "/searchUser", params = "userName")
public ModelAndView searchUserByName(@RequestParam String userName) {
  // ...
}

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