Spring MVC 和休眠

Question

我正在使用休眠来存储一个具有嵌入式类型地址对象的学生对象。我正在使用表单来获取输入名称、城市、州。 City & State 在提交表单时获取 null 如何在模型对象中捕获这些值。 ${student.homeAddress.city} - 此值为 NULL

问题已解决！

public class Student {

@Id
@Column(name = "student_id")
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "students_seq")
@SequenceGenerator(sequenceName = "students_seq", name = "students_seq", allocationSize = 1)
private int studentId;

@Column(name = "student_name")
private String studentName;

@Embedded
private Address homeAddress;
}

@Controller
@RequestMapping("/students")
public class StudentController {

@Autowired
StudentService studentService;

@RequestMapping("/registrationForm")
public String showFormForStudentRegistration(Model model) {

    Student studentObj = new Student();
    Address addressObj = new Address();
    studentObj.setHomeAddress(addressObj);
    model.addAttribute("student", studentObj);
    return "student-form";
}

@RequestMapping("/register")
public String registerStudent(@ModelAttribute("student") Student student) {
    
    studentService.createStudent(student);
    return "student-success";
    
}
}   

Answer 1

**${student.address.state} -> 这是提交后需要怎么访问的。提交表单时应该是这样