CODEWITHSUNDEEP
javaspringvalidationspring-mvc
sidgate
sidgate

Reputation: 15254

Validating request parameter before controller

I want to validate the request parameter which is just a string value. Most of the examples on the net talks about validating a domain object with custom validator. But I want to write a validator just for String value. How to achieve that?

@Controller
@RequestMapping("/base")
class MyController{

   //value needs to be validated.
   @RequestMapping("/sub")
   public String someMethod(@RequestParam String value, BindingResult result){
       if(result.hasErrors()){
          return "error";
       }

       //do operation
       return "view";

   }
}

I want to use the Validator interface that is already available in Spring, not AOP or any IF conditions

Upvotes: 2

Views: 2652

Answers (2)

Serge Ballesta
Serge Ballesta

Reputation: 149165

Your controller cannot validate the param, because BindingResult shall follow a ModelAttribute, not a RequestParam.

So if you want to use the Spring MVC automatic validation, you should use a class containing your string as a ModelAttribute :

class MyController {
   @RequestMapping("/sub")
   public String someMethod(@ModelAttribute Params params, BindingResult result){
       if(result.hasErrors()){
          return "error";
       }

       //do operation with params.value
       return "view";

   }

    public static class Params {
        // add eventual JSR-303 annotations here
        String value;

       // getter and setter ommited for brievety
    }

}

Of course, this assumes you put a validator into the WebBinder for example through an @InitBinder annotated method of your controller.

Upvotes: 2

SergSt
SergSt

Reputation: 1

   //value needs to be validated.
   @RequestMapping("/sub")
   public String someMethod(@RequestParam String value, BindingResult result) throws SomeException {

        if (!ValidationUtils.isValid(value)) {
            throw new SomeException("Some text");
        }

Upvotes: 0

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