Thymeleaf 无法正确处理模板

Question

我一直在开发一个带有前端和后端的简单项目，用于管理大学 IT 门票。在使用 Spring 和 MySQL 数据库实现了不同的方法（并且所有方法都运行良好）之后，我们需要使用 thymeleaf 来实现，但由于某种原因，它既不保存也不显示信息。我已经检查过，application.properties 中数据库的路径和密码是正确的，并且所有依赖项都在 pom.xml 中。这是代码：

票务控制器：

package ch.supsi.webapp.web.controller;

import ch.supsi.webapp.web.model.Status;
import ch.supsi.webapp.web.model.Ticket;
import ch.supsi.webapp.web.repository.TicketRepository;
import ch.supsi.webapp.web.service.TicketService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import java.io.IOException;
import java.util.List;
import java.util.Optional;

@Controller

public class TicketController  {

    TicketService service;


    public TicketController(TicketRepository repository,TicketService service) {
        this.service=service;
    }




    @GetMapping("/index")
    public String index(Model model){
        model.addAttribute("tickets",service.list());
        //model.addAttribute("openTickets", service.findLast5ByStatus(Status.OPEN));
        //model.addAttribute("closedTickets", service.findLast5ByStatus(Status.CLOSED));
        return "index";
    }


    @PostMapping("/ticket/new")
    public String newPost(Model model){
        model.addAttribute("ticket", new Ticket());
        model.addAttribute("isNew", true);
        model.addAttribute("authors", service.getAuthors());
        return "redirect:/";
    }

    @PostMapping("/ticket/new")
    public String post(Ticket ticket) throws IOException {
        service.save(ticket);
        return "redirect:/";
    }




}

票务服务

package ch.supsi.webapp.web.service;
import ch.supsi.webapp.web.model.Status;
import ch.supsi.webapp.web.model.Ticket;
import ch.supsi.webapp.web.repository.TicketRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import ch.supsi.webapp.web.model.Author;
import ch.supsi.webapp.web.repository.AuthorRepository;
import java.util.List;

import java.util.Optional;

@Service
public class TicketService {

    private final TicketRepository repository;
    private final AuthorRepository authorRepository;

    public TicketService(TicketRepository ticketRepository, AuthorRepository authorRepository) {
        this.repository = ticketRepository;
        this.authorRepository = authorRepository;
    }
    public void save(Ticket ticket) {
        repository.save(ticket);
    }


    public void remove(long id) {
        repository.deleteById((int) id);
    }

    public Optional<Ticket> read(long id){
       return repository.findById((int) id);
    }
    public  List<Ticket> list() {
        return (List<Ticket>) repository.findAll();
    }

   public void update(long id , Ticket ticket){
       Optional<Ticket> optionalTicket = repository.findById((int) id);
      // Optional<Ticket> optionalAuthor = repository.findById(ticket.getAuthor());
           Ticket existingTicket = optionalTicket.get();
           //existingTicket.setAuthor(ticket.getAuthor());
           existingTicket.setTitle(ticket.getTitle());
           existingTicket.setDescription(ticket.getDescription());
           repository.save(existingTicket);

    }

    public List<Ticket> findLast5ByStatus(Status ticketStatus){
        return repository.findByStatusOrderByDateDesc(ticketStatus);



    }
    public List<Author> getAuthors() {
        return (List<Author>) authorRepository.findAll();}
    public boolean exists(int id) {
        return repository.existsById(id);
    }

}

票证存储库

package ch.supsi.webapp.web.repository;

import ch.supsi.webapp.web.model.Status;
import ch.supsi.webapp.web.model.Ticket;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

import java.util.List;


@Repository
public interface TicketRepository extends CrudRepository<Ticket, Integer>
{
    List<Ticket> findByStatusOrderByDateDesc(Status ticketStatus);
    //public Ticket findTicket(long id);

    //public void setChanges(Ticket ticket);
}

/ticket/new.html

<!DOCTYPE html>
<html lang="en">

<head>
</head>

<body>
<header>
    <img alt="SUPSI" height="32" src="https://www.supsi.ch/o/supsi-theme/images/supsi-logo.svg" width="117">
    <h1>SUPSI Tickets</h1>
</header>
<nav>
    <hr>
    <a th:href="@{/static}">Home</a> |
    <a>New ticket</a> |
    <hr>
</nav>
<form method="post" th:action="@{/ticket/new}"  th:object="${ch.supsi.webapp.web.model.Ticket}">
    <fieldset>
        <legend>New ticket</legend>
        <div>
            <label >Title:
            <input th:field="*{title}" type="text">
            </label>
        </div>
        <div>
            <label for="author">Author:</label>
            <input id="author" class="form-select" th:field="*{author}">

        </div>
        <div >
            <label for="status">Status:</label>
            <select id="status" th:field="*{status}">
                <option th:each="status : ${T(ch.supsi.webapp.web.model.Status).values()}" th:value="${status.values()}" th:text="${status.values()}"></option>
            </select>
        </div>
        <div>
            <label for="type">Type:</label>
            <select id="type" th:field="*{type}">
                <option th:each="type : ${T(ch.supsi.webapp.web.model.Type).values}" th:value="${type}" th:text="${type}">Bug</option>
            </select>
        </div>
        <div>
            <label >Description:</label>
            <textarea th:field="*{description}"></textarea>
        </div>
    </fieldset>
    <input type="submit" th:value="${isNew} ? 'Create ticket':'Update ticket'">
</form>
<footer>
    <hr>
    <small>TICKETS Copyleft CC-by
        <time datetime="2022">2022</time>
        by L:S</small>
    <hr>
</footer>
</body>

</html>

index.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<html lang="en">
<head>
    <link rel="stylesheet" href="style.css">
    <title> This is PP5 page</title>
</head>
<body>
    <nav>
        <ul>
            <div class="item"> <a href="index.html" >Home</a></div>
            <div class="item"><a  th:href="@{/ticket/new}" href="ticket/new.html" >New Ticket </a></div>
            <div class="item"><a href="ticket1Details.html">Ticket 1 details</a></div>
        </ul>
    </nav>
    <header >
        <h2>Welcome ! </h2>
    </header>
    <main>
    <div> <h2> Ticket management system </h2></div>
        <section>
            <h2>Open tickets</h2>
            <article th:each="ticket : ${tickets}">
                <span th:text="${#dates.format(ticket.date, 'dd.MM.yyyy HH:mm')}"></span>
                <h3 th:text="${ticket.getTitle()}">Il primo ticket</h3>
                <a th:href="@{'/ticket/'+${ticket.getId()}}">view</a>
                <a th:href="@{'/ticket/'+${ticket.getId()}+'/edit'}">edit</a>
            </article>
            <article th:if="${#lists.isEmpty(openTickets)}">There's no ticket. Yippee!</article>
        </section>
        <aside rel="stylesheet"  href="style.css">
        <p>This is PP5 sidebar</p>
    </aside>
    </main>
    <footer rel="stylesheet"  href="style.css">
        <h3> This is the footer </h3>
        <p> Copyleft CC-by 2023 by Patricia </p>
    </footer>
</body>
</html>

Answer 1

当您多次映射资源“/ticket/new”时，此代码将不会运行，因此 Spring 不知道要调用哪个方法。