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
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.
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