我已經完成了與這個問題相關的大部分或所有 StackOverflow 問題，但我還沒有看到解決我問題的答案。我有這個基本的應用程式，可以將兩種不同型別的物體保存到資料庫（用戶和報價單）。我能夠很好地保存 User 物體，但 Quote 物體沒有得到保存。
應用控制器
@Controller
public class AppController {
@Autowired
private UserRepository userRepository;
@Autowired
private QuoteRepository quoteRepository;
@GetMapping("/")
public String viewHomePage() {
return "index";
}
@GetMapping("/register")
public String viewRegistrationForm(Model model) {
User newUser = new User();
model.addAttribute("user", newUser);
return "signup_form";
}
@PostMapping("/processRegister")
public String processRegister(User user) {
BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
String encodedPassword = passwordEncoder.encode(user.getPassword());
user.setPassword(encodedPassword);
userRepository.save(user);
return "register_success";
}
@GetMapping("/users")
public String listUsers(Model model) {
List<User> users = userRepository.findAll();
model.addAttribute("users", users);
return "list_users";
}
@GetMapping("/quotes")
public String listQuotes(Model model) {
List<Quote> quotes = quoteRepository.findAll();
model.addAttribute("quotes", quotes);
return "quotes/list_quotes";
}
@GetMapping("/showFormToAddQuote")
public String showFormToAddQuote(Model model) {
Quote quote = new Quote();
model.addAttribute("quote", quote);
return "quotes/add_quote";
}
@PostMapping("/processQuote")
public String processQuote(@ModelAttribute("quote") Quote quote) {
quoteRepository.save(quote);
return "redirect:/quotes";
}
}
用戶類
@Entity
@Table(name="users")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="id")
private Long id;
@Column(nullable = false, unique = true, length = 45)
private String email;
@Column(nullable = false, length = 64)
private String password;
@Column(name = "first_name", nullable = false, length = 20)
private String firstName;
@Column(name = "last_name", nullable = false, length = 20)
private String lastName;
public User() {}
public User(Long id, String email, String password, String firstName, String lastName) {
this.id = id;
this.email = email;
this.password = password;
this.firstName = firstName;
this.lastName = lastName;
}
// getters and setters
}
用戶存盤庫類
public interface UserRepository extends JpaRepository<User, Long> {
@Query("SELECT u FROM User u WHERE u.email = :email")
public User findByEmail(@Param("email") String email);
}
報價類
@Entity
@Table(name="quote")
public class Quote {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="id")
private int id;
@Column(name="quote")
private String quote;
@Column(name="quotee")
private String quotee;
@Column(name="found_in")
private String foundIn;
public Quote() {}
public Quote(int id, String quote, String quotee, String foundIn) {
super();
this.id = id;
this.quote = quote;
this.quotee = quotee;
this.foundIn = foundIn;
}
// getters and setters
}
報價庫類
public interface QuoteRepository extends JpaRepository<Quote, Integer> {
}
對 html 表單使用 Thymeleaf 語法??：
列出報價 HTML
<div class="container text-center">
<table class="table table-striped table-bordered">
<thead class="table-dark">
<tr>
<th>Quote</th>
<th>Quotee</th>
<th>Found In</th>
</tr>
</thead>
<tbody>
<tr th:each="quote: ${quotes}">
<td th:text="${quote.quote}">Quote</td>
<td th:text="${quote.quotee}">Quotee</td>
<td th:text="${quote.foundIn}">Found In</td>
</tr>
</tbody>
</table>
</div>
添加報價單 HTML
<form th:action="@{/processQuote}" th:object="${quote}"
method="POST" style="max-width: 600px; margin: 0 auto;">
<input type="text" th:field="*{quote}"
class="form-control mb-4 col-4" placeholder="Quote" required>
<input type="text" th:field="*{quotee}"
class="form-control mb-4 col-4" placeholder="Quotee">
<input type="text" th:field="*{foundIn}"
class="form-control mb-4 col-4" placeholder="Source (Found In)">
<button type="submit" class="btn btn-primary">Save</button>
</form>
我排除了匯入、包名和 getter/setter。即使該欄位的型別為字串，spring 似乎也在嘗試將與表的“引號”列對應的字串輸入轉換為整數。
堆疊跟蹤
There was an unexpected error (type=Bad Request, status=400).
Failed to convert value of type 'java.lang.String' to required type 'com.maria.springboot.quoterepo.entity.Quote'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.lang.Integer] for value 'Life isn't about finding yourself. Life is about creating yourself.'; nested exception is java.lang.NumberFormatException: For input string: "Lifeisn'taboutfindingyourself.Lifeisaboutcreatingyourself."
org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'com.maria.springboot.quoterepo.entity.Quote'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.lang.Integer] for value 'Life isn't about finding yourself. Life is about creating yourself.'; nested exception is java.lang.NumberFormatException: For input string: "Lifeisn'taboutfindingyourself.Lifeisaboutcreatingyourself."
at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:79)
at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:53)
at org.springframework.validation.DataBinder.convertIfNecessary(DataBinder.java:700)
at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttributeFromRequestValue(ServletModelAttributeMethodProcessor.java:142)
at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:78)
at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:147)
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:179)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:146)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
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:681)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:327)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:115)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:81)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:122)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:116)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:126)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:81)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:109)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:149)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.ui.DefaultLogoutPageGeneratingFilter.doFilterInternal(DefaultLogoutPageGeneratingFilter.java:58)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter.doFilter(DefaultLoginPageGeneratingFilter.java:237)
at org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter.doFilter(DefaultLoginPageGeneratingFilter.java:223)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:219)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:213)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:132)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1732)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.lang.Integer] for value 'Life isn't about finding yourself. Life is about creating yourself.'; nested exception is java.lang.NumberFormatException: For input string: "Lifeisn'taboutfindingyourself.Lifeisaboutcreatingyourself."
at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:47)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:192)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:175)
at org.springframework.data.repository.support.DomainClassConverter$ToEntityConverter.convert(DomainClassConverter.java:176)
at org.springframework.data.repository.support.DomainClassConverter.lambda$convert$0(DomainClassConverter.java:84)
at java.base/java.util.Optional.map(Optional.java:260)
at org.springframework.data.repository.support.DomainClassConverter.convert(DomainClassConverter.java:84)
at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:41)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:192)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:129)
at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:73)
... 99 more
Caused by: java.lang.NumberFormatException: For input string: "Lifeisn'taboutfindingyourself.Lifeisaboutcreatingyourself."
at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
at java.base/java.lang.Integer.parseInt(Integer.java:660)
at java.base/java.lang.Integer.valueOf(Integer.java:991)
at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:211)
at org.springframework.core.convert.support.StringToNumberConverterFactory$StringToNumber.convert(StringToNumberConverterFactory.java:64)
at org.springframework.core.convert.support.StringToNumberConverterFactory$StringToNumber.convert(StringToNumberConverterFactory.java:50)
at org.springframework.core.convert.support.GenericConversionService$ConverterFactoryAdapter.convert(GenericConversionService.java:437)
at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:41)
... 109 more
uj5u.com熱心網友回復：
Caused by: java.lang.NumberFormatException: For input string: "Lifeisn'taboutfindingyourself.Lifeisaboutcreatingyourself."
at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
at java.base/java.lang.Integer.parseInt(Integer.java:660)
這是導致問題的原因 - 它無法決議"Lifeisn'taboutfindingyourself.Lifeisaboutcreatingyourself."為整數。
我的猜測是它正在發生，因為您沒有 Quote 的建構式，它需要 3 個字串，因此 Thymeleaf 選擇一個包含所有引數（包括 Id）的建構式，并嘗試將第一個引數轉換為整數。
嘗試創建正確的建構式：
public Quote(String quote, String quotee, String foundIn) {
this.quote = quote;
this.quotee = quotee;
this.foundIn = foundIn;
}
還要確保所有的二傳手也都在場——對百里香很重要
uj5u.com熱心網友回復：
在物體而不是基元中為您的屬性使用Wrapper型別。如下idQuote
@Entity
@Table(name="quote")
public class Quote {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="id")
private Long id; // <--- Change from `int` to Long
...
...
}
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