问题：

表单验证返回白标签错误页

闾丘英悟

2023-03-14

我尝试使用spring boot 2.2和thymeleaf进行表单验证，如文档示例所示(https://spring.io/guides/gs/validating-form-input/)但当提交错误的值时，我有一个白色标签错误页面，而我应该在表单视图中绑定这些错误。如何解决这个问题？

我的控制器操作代码：

@Controller
public class TodoController {

    @RequestMapping(value = "/todo/create", method = RequestMethod.GET)
    public String tplTodoCreate(Model model) {
        TodoForm todoForm = new TodoForm();
        return "v-todo-create";
    }

    @RequestMapping(value = "/todo/create", method = RequestMethod.POST)
    public String tplTodoCreatePost(@ModelAttribute(name="formTodo") @Valid TodoForm todoForm, RedirectAttributes redirAttrs, BindingResult result) {
        if(result.hasErrors()) {
            return "v-todo-create";
        }

        todoRepository.save(todoForm);
        redirAttrs.addFlashAttribute("msgNotices", "Todo task created successfuly.");
        return "redirect:/todos";
    }
}

和视图：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout" layout:decorator="tpl-default">
<head>
    <title th:text="#{ctl-todo.create.meta.title}">Create New Todo</title>
    <link th:href="@{/css/todo/create.css}" rel="stylesheet" />
</head>
<body>
    <div id="wrapper" layout:fragment="content">
        <h2 class="page-header" th:text="#{ctl-todo.create.00001strid}">Add Todo</h2>
        <form name="todo" method="post" action="#" th:action="@{/todo/create}" th:object="${todoForm}" class="my-form-class">
            <div id="form">
                <div>
                    <label for="form_name" class="required" th:text="#{ctl-todo.create.00002strid}">Name</label>
                    <p th:if="${#fields.hasErrors('name')}" th:errors="*{name}"></p>
                    <input type="text" th:field="*{name}" id="form_name" name="name" min="1" max="30" required="required" class="form-control" style="margin-bottom:15px;" />
                </div>
                <div>
                    <button type="submit" id="form_save" name="save" class="btn btn-primary" style="margin-bottom:15px;" th:text="#{ctl-todo.create.00013strid}">Create Todo</button>
                </div>
            </div>
        </form>
        <hr />
        <a class="btn btn-default" href="/todos"><span class="glyphicon glyphicon-floppy-remove"></span> <span th:text="#{ctl-todo.create.00014strid}">Back to todos list</span></a>
    </div>
</body>
</html>

堆栈跟踪是：

2020-01-06 21:47:30.780  WARN 12140 --- [nio-8080-exec-8] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors
Field error in object 'formTodo' on field 'name': rejected value [a]; codes [Size.formTodo.name,Size.name,Size.java.lang.String,Size]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [formTodo.name,name]; arguments []; default message [name],30,2]; default message [size must be between 2 and 30]]

Whiteblabel错误页面为：

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Jan 07 10:08:07 GMT+01:00 2020
There was an unexpected error (type=Bad Request, status=400).
Validation failed for object='formTodo'. Error count: 1
org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors
Field error in object 'formTodo' on field 'name': rejected value [a]; codes [Size.formTodo.name,Size.name,Size.java.lang.String,Size]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [formTodo.name,name]; arguments []; default message [name],30,2]; default message [size must be between 2 and 30]
    at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:164)
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.base/java.lang.Thread.run(Thread.java:830)

典型情况下，name字段的min属性等于1，但TodoForm实体的size约束为min=2且max=30。当我测试仅提交一个字符的值时，检测到好错误，但返回错误为白色标签页面，而不是带有错误的视图。

编辑：问题已解决。这是由参数进入tplTodoCreatePost（）方法和@modeltribute（name=“formTodo”）的顺序引起的。方法签名被修改为公共字符串tplTodoCreatePost（@Valid-TodoForm-TodoForm，BindingResult，RedirectAttributes-redirAttrs）

共有2个答案

石俊雄

2023-03-14

作为参考，我已经删除了@modeldattribute（name=“formTodo”），因为使用它时不会显示错误。

@RequestMapping(value = "/todo/create", method = RequestMethod.POST)
public String tplTodoCreatePost(@Valid TodoForm todoForm, BindingResult result, RedirectAttributes redirAttrs) {
    if(result.hasErrors()) {
        return "v-todo-create";
    }

    todoRepository.save(todoForm);
    redirAttrs.addFlashAttribute("msgNotices", "Todo task created successfuly.");
    return "redirect:/todos";
}

袁阿苏

2023-03-14

我会尝试向模型添加一个参数。但是没有堆栈跟踪很难排除故障。你能把它附加到你的帖子上吗？控制器的其余部分，带有GET方法映射在这里可能会有所帮助。

编辑：

我认为问题在于tplTodoCreatePost方法的参数顺序。请尝试将BindingResult移动到Model之前，如下所示：

public String tplTodoCreatePost(@Valid TodoForm todoForm, BindingResult result, @ModelAttribute(name="formTodo"), RedirectAttributes redirAttrs, ) {
    // method body
}

表单验证返回白标签错误页

共有2个答案

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