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我尝试像文档示例（https://spring.io/guides/gs/validating-form-input/）一样使用 spring boot 2.2 和 thymeleaf 进行表单验证，但是当提交错误值时我有一个白标签错误页面当我应该在我的表单视图中绑定这些错误时。如何解决？

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";
    }
}

和观点：

<!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 错误页面是：

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)

通常，名称字段的 min 属性等于 1，但 TodoForm 实体具有 min=2 和 max=30 的 Size 约束。当我测试提交一个只有一个字符的值时，会检测到正确的错误，但会将错误返回为白标签页面，而不是带有错误的视图。

编辑：问题解决了。这是由 tplTodoCreatePost() 方法和 @ModelAttribute(name="formTodo") 中的参数顺序引起的。方法签名被修改为public String tplTodoCreatePost(@Valid TodoForm todoForm, BindingResult result, RedirectAttributes redirAttrs)

4

2 回答 2

1

我会尝试向模型添加一个参数。但是如果没有堆栈跟踪，很难进行故障排除。你能把它附在你的帖子里吗？此外，带有 GET 方法映射的控制器的其余部分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。BindingResult之前请尝试移动Model，如下：

public String tplTodoCreatePost(@Valid TodoForm todoForm, BindingResult result, @ModelAttribute(name="formTodo"), RedirectAttributes redirAttrs, ) {
    // method body
}
于 2020-01-06T20:02:23.653 回答
1

有关信息，我已删除 @ModelAttribute(name = "formTodo") 因为使用它时未显示错误。

@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";
}
于 2020-01-07T11:18:24.983 回答