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输入验证在 Spring + Thymeleaf 中不起作用

[英]Input validation doesn't work in Spring + Thymeleaf

 原文  2021-03-11 19:06:54  7   3    java/ spring/ spring-boot/ spring-mvc/ thymeleaf

问题描述

我是 spring 的新手，我使用“Spring in action 5”一书进行了探索。 我对我的网站做了类似的操作，我为页面编写了 2 个控制器和 2 个 html 文件。 第一页是创建披萨的表格。 二是提交订单。 我的控制器代码实际上与书中相同。 一切正常，直到我开始验证表单输入。 我做了 Pizza、Order 类和控制器所需的一切。

订购 class：

@Data
public class Order {
    @NotBlank(message = "Name is required")
    private String name;

    @NotBlank(message = "Street os required")
    private String street;

    @NotBlank(message = "City is required")
    private String city;

    @NotBlank(message = "State is required")
    private String state;

    @NotBlank(message = "Zip is required")
    private String zip;

    @CreditCardNumber(message = "Not a valid credit card number")
    private String ccNumber;

    @Pattern(regexp = "^(0[1-9]|1[0-2])([\\/])([1-9][0-9])$")
    private String ccExpiration;

    @Digits(integer = 3, fraction = 0, message = "Invalid CVV")
    private String ccCVV;
}

比萨class：

@Data
public class Pizza {
    @NotNull
    @Size(min = 3, message = "Name must be at least 3 characters long")
    private String name;

    @Size(min = 1, message = "You must choose at least 1 ingredient")
    private List<String> ingredients;
}

Controller 用于创建披萨：

@Slf4j
@Controller
@RequestMapping("/create")
public class CreatePizzaController {
    @GetMapping
    public String showCreationForm(Model model){
        List<Ingredient> ingredients = Arrays.asList(
                new Ingredient("CLS22", "Classic base 22cm", Ingredient.Type.BASIC),
                new Ingredient("CLS30", "Classic base 30cm", Ingredient.Type.BASIC),
                new Ingredient("PEPE", "Pepperoni", Ingredient.Type.MEAT),
                new Ingredient("HAM", "Ham", Ingredient.Type.MEAT),
                new Ingredient("CHMPG", "Champignons", Ingredient.Type.VEGGIES),
                new Ingredient("CUCU", "Cucumbers", Ingredient.Type.VEGGIES),
                new Ingredient("PARM", "Parmesan cheese", Ingredient.Type.CHEESE),
                new Ingredient("MOZ", "Mozzarella cheese", Ingredient.Type.CHEESE),
                new Ingredient("BARBS", "Barbecue sauce", Ingredient.Type.SAUCE),
                new Ingredient("TOMAS", "Tomato sauce", Ingredient.Type.SAUCE)
                );

        Ingredient.Type[] types = Ingredient.Type.values();
        for(Ingredient.Type type: types){
            model.addAttribute(type.toString().toLowerCase(), filterByType(ingredients, type));
        }
        model.addAttribute("create", new Pizza());
        return "create";
    }

    @PostMapping
    public String processCreation(@Valid Pizza pizza, Errors errors){
        if(errors.hasErrors()){
            return "create";
        }
        //Save creation...
        log.info("Processing creation: " + pizza);
        return "redirect:/orders/current";
    }

    private List<Ingredient> filterByType(List<Ingredient> ingredients, Ingredient.Type type) {
        List<Ingredient> filtered = new ArrayList<>();
        for (Ingredient ingredient:ingredients){
            if(ingredient.getType() == type){
                filtered.add(ingredient);
            }
        }
        return filtered;
    }
}

Controller 用于表单提交：

@Slf4j
@Controller
@RequestMapping("/orders")
public class OrderController {
    @GetMapping("/current")
    public String orderForm(Model model){
        model.addAttribute("order", new Order());
        return "orderForm";
    }
    @PostMapping
    public String processOrder(@Valid Order order, Errors errors) {
        if (errors.hasErrors()){
            return "orderForm";
        }
        log.info("Order submitted: " + order);
        return "redirect:/";
    }
}

问题在于验证比萨饼的创建。 当我输入无效的披萨名称并单击按钮提交我的披萨时，我得到 Whitelabel 错误页面。

2021-03-11 21:48:56.740 ERROR 124 --- [nio-8080-exec-6] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/create.html]")] with root cause

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'create' available as request attribute
    at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:153) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at org.springframework.web.servlet.support.RequestContext.getBindStatus(RequestContext.java:903) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at org.thymeleaf.spring5.context.webmvc.SpringWebMvcThymeleafRequestContext.getBindStatus(SpringWebMvcThymeleafRequestContext.java:227) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.spring5.util.FieldUtils.getBindStatusFromParsedExpression(FieldUtils.java:306) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:253) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:227) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.spring5.processor.AbstractSpringFieldTagProcessor.doProcess(AbstractSpringFieldTagProcessor.java:174) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement(ProcessorTemplateHandler.java:918) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleStandaloneElementEnd(TemplateHandlerAdapterMarkupHandler.java:260) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:256) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleStandaloneElementEnd(OutputExpressionInlinePreProcessorHandler.java:169) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:104) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.attoparser.HtmlElement.handleStandaloneElementEnd(HtmlElement.java:79) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.attoparser.HtmlMarkupHandler.handleStandaloneElementEnd(HtmlMarkupHandler.java:241) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.attoparser.MarkupEventProcessorHandler.handleStandaloneElementEnd(MarkupEventProcessorHandler.java:327) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.attoparser.ParsingElementMarkupUtil.parseStandaloneElement(ParsingElementMarkupUtil.java:96) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:706) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.attoparser.MarkupParser.parse(MarkupParser.java:257) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1393) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1138) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1077) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.43.jar:4.0.FR]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.4.jar:5.3.4]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.43.jar:4.0.FR]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:327) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:115) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:81) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:126) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:81) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:105) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:149) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91) ~[spring-web-5.3.4.jar:5.3.4]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183) ~[spring-security-web-5.4.5.jar:5.4.5]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) ~[spring-web-5.3.4.jar:5.3.4]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) ~[spring-web-5.3.4.jar:5.3.4]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.4.jar:5.3.4]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.4.jar:5.3.4]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.4.jar:5.3.4]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
    at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]

似乎我的CreatePizzaController class 中的属性不能正常工作，它必须被破坏，尽管我会在下面给出 html 代码。 我尝试将processCreation方法中的Errors参数替换为BindingResult参数并检查错误，但它的工作原理相同。 请帮助我，我真的不明白为什么我的代码不适用于输入验证。

orderForm.html：

<!DOCTYPE html>
<html lang="en">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form method="POST" th:action="@{/orders}" th:object="${order}">
    <h1>Order your pizza creations!</h1>
    <img th:src="@{/images/pizza_logo.jpg}"/>
    <a th:href="@{/create}" id="another">Create another pizza</a><br/>
    <div th:if="${#fields.hasErrors()}">
        <span class="validationError">Please correct the problems below and resubmit.</span>
    </div>
    <h3>Deliver my pizza masterpiece to...</h3>
    <label for="name">Name: </label>
        <input type="text" th:field="*{name}"/>
    <br/>
    <label for="street">Street address: </label>
     <input type="text" th:field="*{street}"/>
    <br/>
    <label for="city">City: </label>
     <input type="text" th:field="*{city}"/>
    <br/>
    <label for="state">State: </label>
     <input type="text" th:field="*{state}"/>
    <br/>
    <label for="zip">Zip code: </label>
     <input type="text" th:field="*{zip}"/>
    <br/>

    <h3>Here's how I'll pay...</h3>
    <label for="ccNumber">Credit Card #: </label>
    <input type="text" th:field="*{ccNumber}"/>
    <span class="validationError"
          th:if="${#fields.hasErrors('ccNumber')}"
          th:errors="*{ccNumber}">CC Num Error</span>
    <br/>

    <label for="ccExpiration">Expiration: </label>
    <input type="text" th:field="*{ccExpiration}"/>
    <span class="validationError"
          th:if="${#fields.hasErrors('ccExpiration')}"
          th:errors="*{ccExpiration}">CC Num Error</span>
    <br/>

    <label for="ccCVV">CVV: </label>
    <input type="text" th:field="*{ccCVV}"/>
    <br/>
    <input type="submit" value="Submit order"/>
</form>
</body>
</html>

创建.html：

<!DOCTYPE html>
<html lang="en">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" th:href="@{/styles/style.css}" />
</head>
<body>
<h3>Create your pizza:</h3>
<img th:src="@{/images/pizza_logo.jpg}" width="200" height="200"/>

<form method="post" th:object="${create}">
    <div class="grid">
        <div class="ingredient-group" id="basics">
            <h3>Choose the basic: </h3>
            <div th:each="ingredient : ${basic}">
                <input name="ingredients" type="radio" checked th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
        <div class="ingredient-group" id="meat">
            <h3>Choose meat: </h3>
            <div th:each="ingredient : ${meat}">
                <input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
        <div class="ingredient-group" id="veggies">
            <h3>Choose vegetables: </h3>
            <div th:each="ingredient : ${veggies}">
                <input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
        <div class="ingredient-group" id="sauce">
            <h3>Choose sauce: </h3>
            <div th:each="ingredient : ${sauce}">
                <input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
        <div class="ingredient-group" id="cheese">
            <h3>Choose cheese: </h3>
            <div th:each="ingredient : ${cheese}">
                <input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
    </div>
    <div class="submit-button">
        <h3>Name your pizza:</h3>
        <input class="submit-field" type="text" th:field="*{name}"/>
        <br/>
        <button>Submit your pizza</button>
    </div>
</form>
</body>
</html>

PS 添加@ModelAttribute 注释有效，我的问题解决了。 但是现在我遇到了另一个与 thymeleaf 相关的问题。 当我添加 thymeleaf 代码来处理输入错误并尝试输入无效的披萨名称时，thymeleaf 只是不会生成我的复选框。 这里是 create.html：

<!DOCTYPE html>
<html lang="en">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" th:href="@{/styles/style.css}" />
</head>
<body>
<h3>Create your pizza:</h3>
<img th:src="@{/images/pizza_logo.jpg}" width="200" height="200"/>

<form method="post" th:object="${create}">
    <div class="grid">
        <div class="ingredient-group" id="basics">
            <h3>Choose the basic: </h3>
            <div th:each="ingredient : ${basic}">
                <input name="ingredients" type="radio" checked th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
        <div class="ingredient-group" id="meat">
            <h3>Choose meat: </h3>
            <div th:each="ingredient : ${meat}">
                <input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
        <div class="ingredient-group" id="veggies">
            <h3>Choose vegetables: </h3>
            <div th:each="ingredient : ${veggies}">
                <input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
        <div class="ingredient-group" id="sauce">
            <h3>Choose sauce: </h3>
            <div th:each="ingredient : ${sauce}">
                <input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
        <div class="ingredient-group" id="cheese">
            <h3>Choose cheese: </h3>
            <div th:each="ingredient : ${cheese}">
                <input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
                <span class="checktext" th:text="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
    </div>
    <div class="submit-button">
        <h3>Name your pizza:</h3>
        <input class="submit-field" type="text" th:field="*{name}"/>
        <span class="validationError"
              th:if="${#fields.hasErrors('name')}"
              th:errors="*{name}">Error</span>
        <br/>
        <button>Submit your pizza</button>
    </div>
</form>
</body>
</html>

一切都很好，直到我单击带有无效名称字段的提交按钮。 之后出现我的错误消息，没有例外以及我的复选框。 这就是它的样子
这是生成的 html 代码

3 个解决方案

解决方案1
 1 已采纳  2021-03-11 19:23:42

使用 @ModelAttribute 注释：

@Valid @ModelAttribute("create") Pizza pizza
@Valid @ModelAttribute("order") Order order

解决方案2
 0  2021-08-02 18:23:08

<form method="post" th:object="${create}">

看上面的代码，
你应该试试这个->（@Valid Pizza create , Errors 错误）

@PostMapping
public String processCreation(@Valid Pizza create, Errors errors){
    if(errors.hasErrors()){
        return "create";
    }
    //Save creation...
    log.info("Processing creation: " + create);
    return "redirect:/orders/current";
}

我认为行动 5 中 Spring 中的对象和模板的命名没有帮助。

例如，您可以将 HTML 模板重命名为 createForm.html，或者只是重命名对象。

解决方案3
 0  2021-10-31 19:57:48

您必须将方法 showCreationForm() 中的硬编码部分提取到另一个方法并使用 @ModelAttribute 对其进行注释。

在此处输入图像描述

在此处输入图像描述

在此处输入图像描述

并使用使用 @ModelAttribute 注释：

在此处输入图像描述

您可以在我的 github link-repo上查看完整示例

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