字段错误和globalerrors在Thymeleaf中保持空白

我目前在一个项目中使用下面的代码，我遇到的问题是即使在bindingresult（bindingResult.hasErrors（）为true）中存在错误时，它也呈现为false百里香的结果。这使我认为bindingResult没有被正确注入。我在下面的代码中做了什么错误？字段错误和globalerrors在Thymeleaf中保持空白

<form action="blog.html" th:action="@{/fileUpload}" method="post" 
     enctype="multipart/form-data" th:object="${form}"> 
     <input type="text" name="title" th:field="*{title}" /> <input 
       type="text" name="content" th:field="*{content}" /> <input 
       type="file" name="myFile" th:field="*{myFile}" /> <input 
       type="submit" /> 

     <div id="errors" class="alert alert-error"> 
       <ul th:if="${#fields.hasErrors('*')}"> 
         <li th:each="err : ${#fields.errors('*')}" th:text="${err}"></li> 
       </ul> 

       <div th:if="${#fields.hasGlobalErrors()}"> 
         <p th:each="err : ${#fields.globalErrors()}" th:text="${err}">...</p> 
       </div> 
     </div> 
</form>

控制器

@RequestMapping(value = "/blog", method = RequestMethod.GET) 
public String getIndex(Model model) { 
     model.addAttribute("form", new AddBlogForm()); 
     return "blog"; 
} 

@RequestMapping(value = "/fileUpload", method = RequestMethod.POST) 
public String importParse(Model model, @Valid AddBlogForm form, BindingResult bindingResult) { 
     model.addAttribute("form", form); 
     try { 
       if (!bindingResult.hasErrors()) { 
         model.addAttribute("successmessage", "Succesfully added"); 
         blogSrv.addPost(form.getTitle(), form.getContent(), form.getMyFile()); 
         model.addAttribute("form", new AddBlogForm()); 
       } 
       return "blog"; 
     } catch (IllegalStateException e) { 
       bindingResult.addError(new ObjectError("image", "IllegalStateException occured " + e.getMessage())); 
       return "blog"; 
     } catch (IOException e) { 
       bindingResult.addError(new ObjectError("image", "IOException occured " + e.getMessage())); 
       return "blog"; 
     } 
}

来源

2015-06-04 Kristof

删除'Model'属性，并添加'@ ModelAttribute'你'AddBlogForm'方法参数。成功保存重定向到你的'/ blog'网址。（Post-redirect-get是一个非常常用的东西）。 –

您正在试图解决林斯数据绑定，工作与框架。

首先从您的方法签名中删除Model属性，第二次在成功保存后使用重定向，最后将@ModelAttribute添加到您的注释中。

@RequestMapping(value = "/fileUpload", method = RequestMethod.POST) 
public String importParse(@Valid @ModelAttribute AddBlogForm form, BindingResult bindingResult) { 
    try { 
     if (!bindingResult.hasErrors()) { 
      blogSrv.addPost(form.getTitle(), form.getContent(), form.getMyFile()); 
      return "redirect:/blog"; 
     } 
    } catch (IllegalStateException e) { 
     bindingResult.addError(new ObjectError("image", "IllegalStateException occured " + e.getMessage())); 
    } catch (IOException e) { 
     bindingResult.addError(new ObjectError("image", "IOException occured " + e.getMessage())); 
    } 
    return "blog" 
}

如果你真的想添加一个成功消息模型，使用RedirectAttributes代替，因此它是重定向后，可使用闪光灯消息。

@RequestMapping(value = "/fileUpload", method = RequestMethod.POST) 
public String importParse(@Valid @ModelAttribute AddBlogForm form, BindingResult bindingResult, RedirectAttributes attrs) { 
    try { 
     if (!bindingResult.hasErrors()) { 
      atts.setFlashAttribute("successmessage", "Succesfully added"); 
      blogSrv.addPost(form.getTitle(), form.getContent(), form.getMyFile()); 
      return "redirect:/blog"; 
     } 
    } catch (IllegalStateException e) { 
     bindingResult.addError(new ObjectError("image", "IllegalStateException occured " + e.getMessage())); 
    } catch (IOException e) { 
     bindingResult.addError(new ObjectError("image", "IOException occured " + e.getMessage())); 
    } 
    return "blog" 
}

来源

2015-06-04 09:31:50

经过一些小小的编辑之后，那就成功了！谢啦！ – Kristof

字段错误和globalerrors在Thymeleaf中保持空白

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