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问题描述
我正在关注使用 Spring MVC、Spring Boot 和 Thymeleaf 作为视图的本教程.我在 HTML 表单上使用 复选框输入 时遇到模板解析错误，奇怪的是，当我删除复选框输入时，一切正常.
I'm following this tutorial which uses Spring MVC, Spring Boot and Thymeleaf as the view. I'm getting a Template Parsing Error when I use a checkbox input on the HTML form, and strangely, when I remove the checkbox input, everything works well.
这是 HTML -
<!DOCTYPE html>
<html lang="en" xmlns:th="https://www.thymeleaf.org/">
<head>
<meta charset="UTF-8">
<title>Home Page</title>
<style>
h1,h2 {
color: rebeccapurple;
}
</style>
</head>
<body>
<h1>This is home page</h1>
<h2>Enter data below</h2>
<form action="/create" method="post" th:object="${userData}">
<p><label>
Full Name<input type="text" th:field="${userData.fullName}" />
</label></p>
<p><label>
Age <input type="text" th:field="${userData.age}" />
</label></p>
<p><label>
Employed? <input type="checkbox" th:field="${userData.isEmployed}"/>
</label></p>
<p> Gender
<label>
Male
<input type="radio" th:field="${userData.gender}" th:value="Male"/>
</label>
<label>
Female
<input type="radio" th:field="${userData.gender}" th:value="Female"/>
</label>
</p>
<input type="submit" value="Submit"/><br>
<input type="reset" value="Reset"/>
</form>
</body>
</html>
这里是控制器类 -
@Controller
public class HomeController {
@RequestMapping("/home")
public String showHomeForm(Model model) {
model.addAttribute("userData", new User());
return "index";
}
@RequestMapping(value = "/create", method = RequestMethod.POST)
public String processHomeForm(User user) {
return "result";
}
}
这里是域(用户)类 -
Here is the domain (User) class -
public class User {
// these fields were private initially...
public String fullName;
public String age;
public boolean isEmployed;
public String gender;
public User() {
System.out.println("User default constructor");
}
public User(String fullName, String age, boolean isEmployed, String gender) {
this.fullName = fullName;
this.age = age;
this.isEmployed = isEmployed;
this.gender = gender;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public boolean isEmployed() {
return isEmployed;
}
public void setEmployed(boolean employed) {
isEmployed = employed;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
}
最后，这是错误和堆栈跟踪 -
And finally, this is the error and the stacktrace -
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Fri May 22 11:58:42 EDT 2020
There was an unexpected error (type=Internal Server Error, status=500).
An error happened during template parsing (template: "class path resource [templates/index.html]")
org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/index.html]")
at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:241)
at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100)
at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)
at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362)
at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057)
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.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
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.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
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.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
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.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:541)
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:373)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
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:834)
Caused by: org.attoparser.ParseException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputCheckboxFieldTagProcessor' (template: "index" - line 27, col 42)
at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:393)
at org.attoparser.MarkupParser.parse(MarkupParser.java:257)
at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230)
... 48 more
Caused by: org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputCheckboxFieldTagProcessor' (template: "index" - line 27, col 42)
at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:117)
at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)
at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)
at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement(ProcessorTemplateHandler.java:918)
at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleStandaloneElementEnd(TemplateHandlerAdapterMarkupHandler.java:260)
at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:256)
at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleStandaloneElementEnd(OutputExpressionInlinePreProcessorHandler.java:169)
at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:104)
at org.attoparser.HtmlElement.handleStandaloneElementEnd(HtmlElement.java:79)
at org.attoparser.HtmlMarkupHandler.handleStandaloneElementEnd(HtmlMarkupHandler.java:241)
at org.attoparser.MarkupEventProcessorHandler.handleStandaloneElementEnd(MarkupEventProcessorHandler.java:327)
at org.attoparser.ParsingElementMarkupUtil.parseStandaloneElement(ParsingElementMarkupUtil.java:96)
at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:706)
at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301)
... 50 more
Caused by: org.springframework.beans.NotReadablePropertyException: Invalid property 'isEmployed' of bean class [com.jrp.springdemo.domain.User]: Bean property 'isEmployed' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:622)
at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:612)
at org.springframework.validation.AbstractPropertyBindingResult.getActualFieldValue(AbstractPropertyBindingResult.java:104)
at org.springframework.validation.AbstractBindingResult.getFieldValue(AbstractBindingResult.java:228)
at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:129)
at org.springframework.web.servlet.support.RequestContext.getBindStatus(RequestContext.java:903)
at org.thymeleaf.spring5.context.webmvc.SpringWebMvcThymeleafRequestContext.getBindStatus(SpringWebMvcThymeleafRequestContext.java:227)
at org.thymeleaf.spring5.util.FieldUtils.getBindStatusFromParsedExpression(FieldUtils.java:306)
at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:258)
at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:227)
at org.thymeleaf.spring5.processor.AbstractSpringFieldTagProcessor.doProcess(AbstractSpringFieldTagProcessor.java:174)
at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)
... 63 more
堆栈跟踪包括一条关于 User 类的 isEmployed 字段是无效属性的消息 -
The stacktrace includes a message about the isEmployed field of the User class being an invalid property -
Caused by: org.springframework.beans.NotReadablePropertyException: Invalid property 'isEmployed' of bean class [com.jrp.springdemo.domain.User]: Bean property 'isEmployed' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
我认为这是导致模板解析错误的原因，但我完全按照教程中显示的方式进行操作.
I think this is what is causing the template parsing error, but I have it exactly the way its shown in the tutorial.
任何帮助将不胜感激.
推荐答案
th:field 应该 used 而不是 isEmployed.>
The th:field should employed rather than isEmployed.
<input type="checkbox" th:field="${userData.employed}" />
来自您的堆栈跟踪的相关错误:
The relevant error from your stack tracec:
引起:org.springframework.beans.NotReadablePropertyException:bean 类的无效属性isEmployed"[com.jrp.springdemo.domain.User]:Bean 属性isEmployed"不是可读或具有无效的 getter 方法:getter 是否匹配 setter 的参数类型?
对于布尔值，used 检查 getter isEmployed() 和 setter setEmployed(...).对于任何其他类型，used 将检查 getter getEmployed() 和 setter setEmployed(...).由于您尝试使用 isEmployed，这意味着 Thymeleaf 正在寻找 isIsEmployed() 或 getIsEmployed().
For boolean values, employed checks for getter isEmployed() and setter setEmployed(...). For any other types employed would check for getter getEmployed() and setter setEmployed(...). Since you tried to use isEmployed that means that Thymeleaf was looking for isIsEmployed() or getIsEmployed().
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