convert form urlencoded and multipart/data body as a bean/interface

[jknack]

req params/headers can be injected in any of these classes:

• interface

public interface Person {
  String name();

  int age();
}

• class with public constructor

public class Person {
  public final String name;

  public final int age;

  public Person(String name, int age) {
   this.name = name;
   this.age = age;
  }
}

• class with no-arg constructor

public class Person {
  private String name;

  private int age;

  public String name() {
    return name;
  }

 public int age() {
    return age;
  }
}

retrieval is done using the req.body or req.params method:

// POST or PUT
Person person = req.body(Person.class);

// GET, etc.
Person person = req.params(Person.class);

or from MVC method

    @GET
    public Object params(Person person) {
      ...
    }

  @POST
    public Object body(Person person) {
      ...
    }