Spring Thymeleaf-如何从html中找到对象ID并将其传递给控制器​​？

Question

In my html I display all my assignment, exam and attendance objects. I want to find the ids of those objects and pass it over to the controller because I want the user to be able to edit those objects and in order to do that I need to find their id. The button to edit the object will be beside the objects name. That is how I want to do it anyway.

Here is my HTML:

div th:each="subject : ${subjects}">
   Subject: <h4 th:text="${subject.subjectName}" />
 /

<h4> assignments:</h4>
<div th:each="assignment : ${subject.assignment}">
<h4 th:text="${assignment.assignmentTitle}"/>
</div>
<h4> exams:</h4>
<div th:each="exam : ${subject.exam}"> 
<h4 th:text="${exam.examTitle}"/>
<h4 th:text="${exam.examId}"/>
</div>
<h4>Attendance:</h4>
<div th:each="attendance : ${subject.attendance}">
<h4 th:text="${attendance.attendanceTitle}"/>
</div>

Here is my Controller:

@GetMapping("/allSubjects")
public String shoSubjects(@ModelAttribute("subject") @Valid UserRegistrationDto userDto, BindingResult result, Model model) {
    Authentication loggedInUser = SecurityContextHolder.getContext().getAuthentication();
    String email = loggedInUser.getName();   


    User user = userRepository.findByEmailAddress(email);
    List<Subject> subjects = user.getSubject();

    model.addAttribute("subjects", user.getSubject());

Answer 1

Here is the solution. I was able to find the ID of the exam that the user selected to edit and it brings them to the edit HTML page.

My HTML:

<h4> exams:</h4>
<div th:each="exam : ${subject.exam}"> 
<h4 th:text="${exam.examTitle}"/>

<a th:href="@{/editExam.html(id=${exam.examId})}">Edit Exam</a>

Controller:

@RequestMapping(value = "/editExam.html{examId}", method =RequestMethod.GET)
public String editExam(@PathVariable String examId) {

    return "editExam";
}