类中的字段值不会使用 Spring Boot MVC 控制器更新

Question

我有一个包裹实体，我正在通过@PostMapping 填充字段。值 Volume 应该从一个方法中获取，该方法从构造函数中的 agruments 中获取值。

控制器类：

    @Controller
public class Controller {

@Value("#{${listOfBases}}")
private List<String> listOfBases;
@Value("#{${listOfDestinations}}")
private List<String> listOfDestinations;


@Autowired
ParcelRepository parcelRepository;


@GetMapping("/register_parcel")
public String showParcelRegistrationForm(Model model) {

    Parcel parcel = new Parcel();
    model.addAttribute("parcel", parcel);
    model.addAttribute("listOfBases", listOfBases);
    model.addAttribute("listOfDestinations", listOfDestinations);
    return "parcel/register_form_parcel";

}

@PostMapping("register_parcel")
public String registerParcel(@ModelAttribute("parcel") Parcel parcel) {
    System.out.println(parcel);
    parcelRepository.save(parcel);

    return "user/user_registration_success_form";
}
 }

包裹类别：

@Entity
 public class Parcel {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
int id;
String length;
String width;
String height;
String weight;
String base;
String destination;
String creationDate;
String volume;

无参数构造函数：

public Parcel() {
    creationDate = getCreationDateAndTime();
}


public Parcel(int id, String length, String width, String height, String weight, String base, String destination) {
    this.id = id;
    this.length = length;
    this.width = width;
    this.height = height;
    this.weight = weight;
    this.base = base;
    this.destination = destination;
    creationDate = getCreationDateAndTime();
    volume = String.valueOf(calculateVolume(width, height, length));
}

Getter 和 Setter：

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getLength() {
    return length;
}

public void setLength(String length) {
    this.length = length;
}

public String getWidth() {
    return width;
}

public void setWidth(String width) {
    this.width = width;
}

public String getHeight() {
    return height;
}

public void setHeight(String height) {
    this.height = height;
}

public String getWeight() {
    return weight;
}

public void setWeight(String weight) {
    this.weight = weight;
}

public String getBase() {
    return base;
}

public void setBase(String base) {
    this.base = base;
}

public String getDestination() {
    return destination;
}

public void setDestination(String destination) {
    this.destination = destination;
}

public String getCreationDate() {
    return creationDate;
}

public void setCreationDate(String creationDate) {
    this.creationDate = creationDate;
}


public String getVolume() {
    return volume;
}

public void setVolume(String volume) {
    this.volume = volume;
}

private String getCreationDateAndTime() {

    DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
    LocalDateTime now = LocalDateTime.now();
    return dtf.format(now);
}

CalculateVolume 方法是问题的根源：

private int calculateVolume(String width, String height, String length) {

    int w = Integer.parseInt(width);
    int h = Integer.parseInt(height);
    int l = Integer.parseInt(length);

    return w * h * l;
}

但我的数据库中的值 volume 为空。甚至 System.out.println();在 calculateVolume 中不会在控制台上打印任何内容，但是当我在 main 中运行创建实例时，一切运行良好且花花公子。

关于我应该如何进行的任何想法，或者我的问题是否过于模糊？

谢谢

@Override
public String toString() {
    return "Parcel{" +
            "id=" + id +
            ", length='" + length + '\'' +
            ", width='" + width + '\'' +
            ", height='" + height + '\'' +
            ", weight='" + weight + '\'' +
            ", base='" + base + '\'' +
            ", destination='" + destination + '\'' +
            ", creationDate='" + creationDate + '\'' +
            ", volume='" + volume + '\'' +
            '}';
}
 }

Answer 1

在控制器中更改 Post 方法 来自

public String registerParcel(@ModelAttribute("parcel") Parcel parcel)

到

public String registerParcel(@RequestBody Parcel parcel)