多个@ModelAttribute

Question

我在JSP文件中有Spring MVC表单：

<form:form action="confirm" modelAttribute="newStudent">
  <b>Personal info:</b><hr>
  <table>
    <tr>
        <td>First name:</td>
        <td>
            <form:input path="firstName" placeholder="Your first name?" />
            <form:errors path="firstName" cssClass="error"/>
        </td>
    </tr>

    <tr>
        <td>Last name:</td>
        <td>
            <form:input path="lastName" placeholder="Your second name?" />  
            <form:errors path="lastName" cssClass="error"/> 
       </td>
   </tr>
   <tr>
       <td>Country:</td>
       <td><form:select path="country">
           <form:options items="${newStudent.countryList}"/>
           </form:select></td>
   </tr>

  </table>
  <input type="submit" value="Submit"/>
</form:form>

还有两个班：

public class NewStudent {


  //Countries List
  Map<String, String> countryList = new LinkedHashMap<>();

  public NewStudent() {
    countryList.put("US", "United States");
    countryList.put("UK", "United Kingdom");
    countryList.put("DE", "Germany");
  }

  public Map<String,String> getCountryList() {

    return countryList;
  }

/////

  @NotNull(message="Required!")
  @Size(min=3, message="At least 3 characters")
  @Pattern(regexp="[A-Za-z]+", message="Invalid name")
  private String firstName;

  @NotNull(message="Required!")
  @Size(min=3, message="At least 3 characters")
  @Pattern(regexp="[A-Za-z]+", message="Invalid last name")
  private String lastName;

  private String country;

  //setters, getters etc.
}

和：

@Entity
@Table(name="new_students")
public class NewStudentEntity {
  @Id
  private int id;

  @Column(name="first_name")
  private String firstName;

  @Column(name="last_name")
  private String lastName;

  @Column(name="country")
  private String country;

  ...
}

我想要做的是使用表单中的数据通过NewStudent将其发送到@ModelAttribute类来验证给定的数据并获取国家列表，但我还想将数据保存到数据库，所以我想将数据从表单发送到Entity类。这可能吗？有没有办法在Form和@ModelAttribute类中使用多个Controller注释或以任何不同的方式来修复它？

Answer 1

也许有不同的选择来解决这个问题，但我用这种方式解决了这个问题：

我将验证注释移到了实体类，如下所示：

@Entity
@Table(name="new_students")
public class NewStudent {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="id")  
private int id;

@Column(name="first_name")
@NotNull(message="Required!")
@Size(min=3, message="At least 3 characters")
@Pattern(regexp="[A-Za-z]+", message="Invalid name")
private String firstName;

@Column(name="last_name")
@NotNull(message="Required!")
@Size(min=3, message="At least 3 characters")
@Pattern(regexp="[A-Za-z]+", message="Invalid last name")
private String lastName;

@NotNull(message="Select the country!")
@Column(name="country")
private String country;

然后将countryList从NewStudent移到Controller类，并使用addAttribute将国家列表从Controller发送到View。