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问题：

输入验证在Spring Thymeleaf中不起作用

上官砚文
2023-03-14

我刚接触spring，我使用《spring in action 5》一书对其进行了探索。我对我的网站做了类似的操作，我已经为页面编写了2个控制器和2个html文件。第一页是比萨饼制作表单。第二个是订单提交。我的控制器代码实际上与书中的相同。在我开始验证表单输入之前，一切都很顺利。我做了比萨饼、订购课程和控制器所需的一切。

订单类：

@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;
}

比萨饼类：

@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;
}

披萨制作控制器：

@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;
    }
}

表单提交控制器：

@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制作。当我输入无效的比萨饼名称并单击按钮提交我的比萨饼时，我会看到白标签错误页面。

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]

似乎我没有正确使用CreatePizzaController类中的属性，它必须被破坏，尽管我将在下面给出html代码。我试图将Process Creation方法中的Error参数替换为BindingResult参数并检查错误，但它的工作原理相同。请帮帮我，我真的不明白为什么我的代码不能用于输入验证。

订单。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>

创造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>

P、 添加@ModelAttribute注释成功了，我的问题解决了。但现在我又遇到了另一个与胸腺素有关的问题。当我添加thymeleaf代码来处理输入错误并尝试输入无效的比萨饼名称时，thymeleaf不会生成我的复选框。这里是创建。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="${ingredient.name}">INGREDIENT</span><br/>
            </div>
        </div>
    </div>
    <div class="submit-button">
        <h3>Name your pizza:</h3>
        <input class="submit-field" type="text" th:field="*{name}"/>
        <span class="validationError"
              th:if="${#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，没有异常以及我的复选框。这是它看起来像
的样子，这是生成的html代码

共有3个答案

徐洛华
2023-03-14 
<form method="post" th:object="${create}">

看看上面的代码，您应该试试这个-

@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Spring在Action 5中对对象和模板的命名没有帮助。

例如，可以将HTML模板重命名为createForm。html，或者简单地重命名对象。

姜俊民
2023-03-14

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

并使用使用@ModelAtcm注释：

您可以在我的github链接repo上看到完整的示例

孟俊晖
2023-03-14

使用@ModelAttribute注释：

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