控制器弹簧数据Jpa和H2

编程问答 2022-08-16

问题描述

我有一个执行若干功能的FilmsController。当我通过控制器进行映射和调用时，我的addNewFilm页面将不会加载，并且在尝试调用它时会显示我的常规错误页面。我还有一个updateFilmName，它将不会加载到我的应用中，用户可以在其中更改显示相同错误的电影的名称。我尝试重命名我的班级，检查不是导致问题的大写字母，甚至删除了所有文件并从头开始重新加载它们，这似乎没有什么不同。我以为问题出在我的@GetMapping方法上，但我发现它们有什么问题。我的其他方法有效，并且没有问题。

我还有一个DirectorsController，直到一个小时前newDirector开始执行与addNewFilm相同的操作并且未加载时，我才遇到问题。他们似乎被正确呼叫，我已经检查了好几次，看不到问题所在。在问题开始之前，我没有对newDirector方法进行任何更改，因为它已经运行了一段时间。

这是我的FilmsController：

@GetMapping("/addNewFilm")
        public String addNewFilmForm(Model model) //new film form where user inputs details and clicks add film
        {
            model.addAttribute("filmForm",new FilmForm());
            model.addAttribute("directors",directorService.listInAlphabeticalOrder());
            return "addNewFilm";
        }
        
        @PostMapping("/addNewFilm"
        public String addNewFilm(Model model,@Valid FilmForm filmForm,BindingResult binding,RedirectAttributes redirectAttributes)
        { 
            if (binding.hasErrors()){
                model.addAttribute("directors",directorService.listInAlphabeticalOrder());
                return "addNewFilm";
            }
            
            //films are allowed to share the same name - but they can't share a director
            Film film = new Film(filmForm.getDirector(),filmForm.getFilmName(),filmForm.getReleaseYear());
            
            return "redirect:/film?id="+film.getFilmId();
        }
        
        @GetMapping("/updateFilmName")
        public String updateFilmname(Model model) //new film form where user inputs details and clicks add film
        {
            model.addAttribute("updateForm",new FilmUpdateForm());
            List<Film> films = filmService.listInChronologicalOrder();
            model.addAttribute("films",films);
            return "updateFilmName";
        }
        
        @PostMapping("/updateFilmName")
        public String updateFilmName(Model model,@Valid FilmUpdateForm updateForm,RedirectAttributes redirectAttributes)
        {
            if (binding.hasErrors())
                return "updateFilmName";
            Film film = new Film(updateForm.getDirector(),updateForm.getFilmName(),updateForm.getReleaseYear());
            if (filmService.existsByFilmNameAndDirector_DirectorId(film)) {
                int fId;
                fId = film.getFilmId();
                filmService.update(fId,updateForm.getFilmName());
            }
                else {
                    return "DuplicateFilmError";
            }
                return "redirect:film/"+ film.getFilmId(); 
        }

    }

这是我的filmForm对象-updateFilmForm相同，因为它需要相同的数据。 ``

public class FilmForm {

    
@Size(min=2,max=20)
    @NotEmpty
    @NotBlank
    private String filmName;
    //add minimum year and max year (won't always be 2020,but can't allow films that are further then current year)
    @PastOrPresent
    @NotBlank
    @Min(1888)
    private int releaseYear;
    @NotEmpty
    private Director director;
    
}

这是我的addNewFilm html，再次更新，因为它需要相同的数据：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <div th:insert="fragments.html :: head"></div>
    <body>
        <header>
            <div th:insert="fragments.html :: menu"></div>
            <h1><span th:text="#{newfilm.addFilm}"></span></h1>
        </header>
        <main>
            <form id ="newFilmForm" method="post" th:action="@{/addNewFilm}" th:object="${filmForm}">
                <label for="filmName" th:text="#{film.filmName}" >
         
                    <input type="text" th:field="*{filmName}"/><span th:if="${#fields.hasErrors('filmName')}" th:errors="*{filmName}" th:text='#{newFilm.Error}'></span>
                <p>
                </label>
                <label for="directorId" th:text="#{newfilm.chooseDirector}">
                </label>
                <select th:field="*{directorId}">
                    <option  th:each="director: ${directors}" th:text="${director.directorFirstName} + ${director.directorSurname}" th:value="${director.directorId}"/>
                </select>
                <br>
                <label for="filmReleaseYear" th:text="#{film.releaseYear}" >
                </label>
                <input type="text" th:field="*{releaseYear}"/><span th:if="${#fields.hasErrors('releaseYear')}" th:errors="*{releaseYear}" th:text='#{newFilm.Error}'></span> 
                <input type="submit" th:value="#{newFilm.addFilm}"/>
            </form>
        </main>
    </body>
    <footer th:insert="fragments.html :: footer"></footer>
</html>

这是我遇到的DirectorsController部分：

@GetMapping("/showNewdirector")
            public String addNewDirectorForm(Model model) //new director form - this is where the user inputs the name of the director and clicks "add director" button
            {
                model.addAttribute("directorForm",new DirectorForm());
                return "newdirector";
            }
            
            @PostMapping("/showNewdirector")
            public String addNewDirectorSave(@Valid @ModelAttribute("aDirectorForm") DirectorForm directorForm,RedirectAttributes redirectAttributes)
            {
                if (binding.hasErrors())
                    return "newdirector";   
                Director director = new Director(directorForm.getDirectorFirstName(),directorForm.getDirectorSurname());  //gets director name through form and combines into a director object
                if(directorService.checkDirectorNameIsNotDuplicate(director) ==false) //checks the director name is not the same as another director in the database. Directors cannot have the same name. 
                    directorService.save(director); //saves new director,which should now appear in the list
                else
                    return "DuplicateDirectorError";
                return "redirect:director/"+ director.getDirectorId(); //redirects to the page of the new Director with all of their details to view i.e. /director/id
        
        }

用来检查导演是否重复的方法：

@Override
    public boolean checkDirectorNameIsNotDuplicate(Director director) {
            int id = 1;
            String dFName;
            String dSName;
            while(directorDao.existsById(id)==true) {
                dFName = directorDao.getDirectorFirstNameById(id);
                dSName = directorDao.getDirectorSurnameById(id);

                if (director.getDirectorFirstName().equals(dFName) && director.getDirectorSurname().equals(dSName)) {
                    return true; //if the entered director name is the same as any already stored it will return true
                }
                else {
                    id++;
                    
                    // this condition ensures that an infinite loop is not caused
                   if (directorDao.existsById(id)==false) {
                        break;
                    }
                }
            }
            return false;
        }

DirectorForm对象：

public class DirectorForm {

    @Size(min=2,max=20)
    @NotEmpty
    private String directorFirstName;
    @Size(min=2,max=20)
    @NotEmpty
    private String directorSurname;
    
}

和newDirector html：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <div th:insert="fragments.html :: head"></div>

    <body>
        <header>
            <div th:insert="fragments.html :: menu"></div>
            <h1><span th:text="#{newDirector.addDirector}"></span></h1>
        </header>
        <main>
            <form id="newDirectorForm" method="post" th:action="@{/shownewdirector}" th:object="${aDirectorForm}">
                <label for="directorFirstName" th:text="#{director.directorFirstName}" >
                </label>
                <input type="text" th:field="*{directorFirstName}"/><span th:if="${#fields.hasErrors('directorFirstName')}" th:errors="*{directorFirstName}"  th:text='#{newDirector.error}'></span> 
                <p>
                <label for="directorSurname" th:text="#{director.directorSurname}" >
                </label>
                <input type="text" th:field="*{directorSurname}"/><span th:if="${#fields.hasErrors('directorSurname')}" th:errors="*{directorSurname}" th:text='#{newDirector.error}'></span>
                <br>
                <input type="submit" th:value="#{newdirector.addDirector}"/>
            </form>
            <h3 class="error" th:if="${duplicate}" th:text="#{newdirector.duplicate}"></h3>
        </main>
    </body>
    <footer th:insert="fragments.html :: footer">
    </footer>
</html>

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

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javajavamodel-view-controllerspringthymeleaf

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