Spring 3 Controller Notes

Validation

Let the controller know what validator to use and what to validate.

import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.WebDataBinder;

@InitBinder("myCommand")
protected void initBinder(WebDataBinder binder) {
    binder.setValidator(this.myValidator);
}

Gain access to the errors by bringing BindingResult into the method signature. BindingResult must immediately succeed your model attribute.

import javax.validation.Valid;
import org.springframework.validation.BindingResult;
import org.springframework.ui.Model;

public void submit(@Valid MyCommand myCommand, BindingResult errors, Model model) {
    if (!errors.hasErrors()) {
        /* good */
    } else {
        /* bad */
    }
}