CODEWITHSUNDEEP
javaspringspring-mvcparametersbean-validation
Steve Chambers
Steve Chambers

Reputation: 39424

How to ensure mandatory parameters are passed into a Spring MVC controller method?

Given a Spring-MVC controller method:

@RequestMapping(value = "/method")
public void method(@RequestParam int param1,
                   @RequestParam int param2) { /*...*/ }

If parameters are missing in the request URL, an error is reported, e.g:

JBWEB000068: message Required int parameter 'param1' is not present

I need to move the parameters into a single model class yet keep exactly the same GET request URL. So have modified method's parameter to MyModel model, which contains param1 and param2.

This works if @RequestParam is omitted but the snag is no error is reported if parameters are missing. If, on the other hand @RequestParam is included, a parameter named "model" is expected in the GET request. Is there a way to make model parameters mandatory yet keep the same request URL?

Upvotes: 0

Views: 2782

Answers (3)

Nano Yulian
Nano Yulian

Reputation: 1

add ( ,@BindingResult result) in your parameter to bind the errors to all parameter. And you can check if the error exist using result.hasErrors()

Upvotes: 0

Afshar
Afshar

Reputation: 307

You can try @ModelAttribute and method=RequestMethod.POST: In your controller:

//...
@RequestMapping(value="/method", method=RequestMethod.POST)
public String add(@ModelAttribute("modelName") ModelClass form)
{
   //.. your code
}

//..

In your JSP:

<%@ taglib uri="http://www.springframework.org/tags/form" prefix="f" %>

//.. some code 

<f:form action="method" method="post" modelAttribute="modelName">

</f:form>

If you are restricted to GET requests only, you might not be able to use a separate ModelClass. You need to resort to request parameters in that case.

Upvotes: 0

M. Deinum
M. Deinum

Reputation: 124632

Use JSR-303 annotations to validate the object (and don't use primitives but the Object representations in that case).

public class MyObject {
    @NotNull
    private Integer param1;

    @NotNull
    private Integer param2;

    // Getters / Setters

}

Controller method.

@RequestMapping(value = "/method")
public void method(@Valid MyObject obj) { /*...*/ }

If you don't have a JSR-303 provider (hibernate-validator for instance) on your classpath create a Validator and use this to validate your object.

Links.

  1. Spring MVC reference guide
  2. Spring Validation reference guide

Upvotes: 4

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