model.addAttribute是否返回null？

Question

我的model.addAttribute (create_room.jsp)向我的控制器(AdminController.java)返回null？

my create_room.jsp的表单：

<form action="create_room_bdd">
    <label for="nameRoom">Name Room</label><br><br>
    <input type="text" name="nameRoom">
    <input type="submit" value="Create Room">
</form>

我的样板房：

package Projet.stage.maven.virtualschool4.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Room {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;

public Room() {

}

public Room(Integer id, String name) {
    this.id = id;
    this.name = name;
}

public Room(String name) {
    this.name = name;
}

    public String getName() {
    return name;
}

我的控制器AdminController：

package Projet.stage.maven.virtualschool4.controller;


import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import Projet.stage.maven.virtualschool4.model.Room;
import Projet.stage.maven.virtualschool4.repository.RoomRepository;


@Controller
public class AdminController {
@Autowired
RoomRepository repo;

@RequestMapping(value = { "create_room" }, method = RequestMethod.GET)
public String index(Model model) {
    return "create_room";
}





@RequestMapping("/create_room_bdd")
public String index4(@ModelAttribute Room room, Model model) {

    model.addAttribute("nameRoom", room.getName());



    Map<String, Object> nameForm;
    nameForm = model.asMap();

    System.out.println("room : " + nameForm.toString());
    //repo.save(test);      

    return "admin";
}


}

结果在我的控制台中，我的"nameRomm“= null而不是我的输入中抓取的文本？：

room : {room=Projet.stage.maven.virtualschool4.model.Room@1b7cbcf9, org.springframework.validation.BindingResult.room=org.springframework.validation.BeanPropertyBindingResult: 0 errors, nameRoom=null}

为什么这个不能工作，而同一型号上的另一个可以工作？

Answer 1

将此名称更改为<input type="text" name="name">，而不是nameRoom。应该可以