You can bind form parameters to a domain model object even if the domain model object does not have setters. Just add a @ControllerAdvice class with an @InitBinder method that configures your application to field binding via the initDirectFieldAccess() method
package boottests.controllers;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.*;
@ControllerAdvice
class BindingControllerAdvice {
@InitBinder
void initBinder(WebDataBinder binder) {
binder.initDirectFieldAccess();
}
}
Here’s how my domain model looks like:
package boottests;
public class Person {
private final String firstname;
private final String lastname;
public Person(String firstname, String lastname) {
this.firstname = firstname;
this.lastname = lastname;
}
@Override
public String toString() {
return firstname + " " + lastname;
}
}
And here’s my Controller:
package boottests.controllers;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import boottests.Person;
@Controller @RequestMapping("/person")
class PersonController {
@GetMapping
String postForm(Person person) {
System.out.println("YYY " + person + " YYY");
return "/";
}
}
And of course, my form, on index.html:
<form action="person" > Lastname: <input type="text" name="lastname"/> <br/> Firstname: <input type="text" name="firstname"/> <br/> <input type="submit" value="Submit"/> </form>
If you run this on Spring Boot, you’ll see that the form parameters were correctly bound to the fields of the domain model.
|
Published on Java Code Geeks with permission by Calen Legaspi, partner at our JCG program. See the original article here: Spring MVC Binding w/o Setters Opinions expressed by Java Code Geeks contributors are their own. |
