弹簧 - Thymeleaf - 404 错误

Question

我过去曾与 Spring 合作过一个大型项目，但我从未从头开始创建 Spring MVC Web 应用程序。

这就是我目前正在做的练习，因为我有一个项目需要它。

我成功地制作了一个使用 .JSP 页面（使用注释，没有 XML）的简单 Spring MVC Web 应用程序。 不过我想使用 Thymeleaf 并开始了我的转换过程。

好吧，现在我遇到了 404 错误，而且我的 HomeController 类似乎没有被击中。

我在控制台输出中没有收到任何错误。

我有 Google 搜索、通读教程和代码示例。第二双眼睛会很好。谢谢！ :)

注意：从 .JSP 到 Thymeleaf 所做的唯一更改是添加了 ThymeleafConfig 类。我不明白它是如何从工作变成不工作的。

这是我的代码：

WebInit.java

public class WebInit implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        // Creates the root application context
        AnnotationConfigWebApplicationContext appContext = new AnnotationConfigWebApplicationContext();
        appContext.register(ServletConfig.class);
        appContext.setDisplayName("REPLACE ME");
        appContext.setConfigLocation("com.demo.config");

        // Creates the Spring Container shared by all Servlets and Filters
        servletContext.addListener(new ContextLoaderListener(appContext));

        // Further configures the servlet context
        ServletRegistration.Dynamic dispatcher = servletContext.addServlet(
                "dispatcher", new DispatcherServlet(appContext));
        dispatcher.setLoadOnStartup(1);
        dispatcher.setAsyncSupported(true);
        dispatcher.addMapping("/");
    }
}

ServetConfig.java

@Configuration
@Import(WebConfig.class)
@ImportResource({/*"classpath:META-INF/spring/persistence-context.xml"*/})
public class ServletConfig {

}

WebConfig.java

@Configuration
@ComponentScan("com.illinois.dnr")
@EnableAspectJAutoProxy
@EnableWebMvc
@Import({ThymeleafConfig.class})
public class WebConfig extends WebMvcConfigurerAdapter {
    // Maps resources path to webapp/resources
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resources/**").addResourceLocations(
                "/resources/");
    }

    // Provides internationalization of messages
    @Bean
    public ResourceBundleMessageSource messageSource() {
        ResourceBundleMessageSource source = new ResourceBundleMessageSource();
        source.setBasename("messages");
        return source;
    }
}

Thymeleaf.java

@Configuration
public class ThymeleafConfig {
    @Bean 
    public ServletContextTemplateResolver templateResolver() {
        ServletContextTemplateResolver resolver = new ServletContextTemplateResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".html");
        resolver.setTemplateMode("HTML5");
        resolver.setOrder(1);
        return resolver;
    }

    @Bean 
    public SpringTemplateEngine templateEngine() {
        SpringTemplateEngine engine = new SpringTemplateEngine();
        engine.setTemplateResolver(templateResolver());
        return engine;
    }

    @Bean 
    public ThymeleafViewResolver thymeleafViewResolver() {
        ThymeleafViewResolver resolver = new ThymeleafViewResolver();
        resolver.setTemplateEngine(templateEngine());
        return resolver;
    }
}

HomeController.java

@Controller
public class HomeController {

    private static final Logger logger = LoggerFactory.getLogger(HomeController.class);

    /**
     * Simply selects the home view to render by returning its name.
     */
    @RequestMapping(value = "/dnr", method = RequestMethod.GET)
    public String home(Locale locale, Model model) {
        logger.info("Welcome home! The client locale is {}.", locale);
        Date date = new Date();
        DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG,
                DateFormat.LONG, locale);
        String formattedDate = dateFormat.format(date);
        model.addAttribute("serverTime", formattedDate);
        return "home";
    }

    @RequestMapping(value = "/login", method = RequestMethod.GET)
    public String loginPage(Locale locale, Model model) {
        logger.info("Login");
        return "login";
    }

    @RequestMapping(value = "/home", method = RequestMethod.POST)
    public String login(@Validated User user, Model model) {
        model.addAttribute("userName", user.getUserName());
        logger.info("User");
        return "user";
    }

    @RequestMapping(value = { "/", "/welcome**" }, method = RequestMethod.GET)
    public ModelAndView welcomePage() {

        ModelAndView model = new ModelAndView();
        model.addObject("title", "Spring Security Hello World");
        model.addObject("message", "This is welcome page!");
        model.setViewName("hello");
        logger.info("Hello");
        return model;
    }

    @RequestMapping(value = "/admin**", method = RequestMethod.GET)
    public ModelAndView adminPage() {

        ModelAndView model = new ModelAndView();
        model.addObject("title", "Spring Security Hello World");
        model.addObject("message", "This is protected page - Admin Page!");
        model.setViewName("admin");
        logger.info("admin");
        return model;
    }

    @RequestMapping(value = "/dba**", method = RequestMethod.GET)
    public ModelAndView dbaPage() {

        ModelAndView model = new ModelAndView();
        model.addObject("title", "Spring Security Hello World");
        model.addObject("message", "This is protected page - Database Page!");
        model.setViewName("admin");
        logger.info("dba");
        return model;
    }
}

Answer 1

我不确定它是否有帮助，但您可以通过 extendsAbstractAnnotationConfigDispatcherServletInitializer 而不是实现 WebApplicationInitializer 来简化 WebInit。否则 Thymeleaf 配置对我来说似乎没问题（假设它被调用）。我在这里给出了配置的工作框架，以便您可以进行试验。

WebApplicationInitializer

public class WebInitializer extends
    AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return null;
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] { WebConfig.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

}

网络配置

@Configuration
@EnableWebMvc
@ComponentScan("com.kreuzman")
public class WebConfig {

    @Bean
    public ITemplateResolver templateResolver() {
        TemplateResolver resolver = new ServletContextTemplateResolver();
        resolver.setPrefix("/templates/");
    resolver.setSuffix(".html");
        resolver.setTemplateMode("HTML5");
        resolver.setCacheTTLMs(0l);

        return resolver;
    }

    @Bean
    public SpringTemplateEngine templateEngine() {
        SpringTemplateEngine engine = new SpringTemplateEngine();
        engine.setTemplateResolver(templateResolver());

        return engine;
    }

    @Bean
    public ViewResolver thymeleafViewResolver() {
        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
        viewResolver.setTemplateEngine(templateEngine());
        viewResolver.setCharacterEncoding("UTF-8");

        return viewResolver;
    }

}

Answer 2

您要点击哪个页面？ /WEB-INF/views/中是否存在该html页面？

它是一个 JSP 页面吗？您需要排除所有不会被 ThymeleafViewResolver 解析的页面。我还注意到您没有将 ThymeleafViewResolver 设置为顺序的第一个。

像这样

@Bean 
public ThymeleafViewResolver thymeleafViewResolver() 
{
    String[] excludedViews = new String[]{
        "login", "logout"};

    ThymeleafViewResolver resolver = new ThymeleafViewResolver();
    resolver.setTemplateEngine(templateEngine());
    /*
     * This is how we get around Thymeleaf view resolvers throwing an error instead of returning
     * of null and allowing the next view resolver in the {@see
     * DispatcherServlet#resolveViewName(String, Map<String, Object>, Locale,
     * HttpServletRequest)} to resolve the view.
     */
    resolver.setExcludedViewNames(excludedViews);
    resolver.setOrder(1);
    return resolver;
}