Failed to convert from type [java.lang.String] to type [java.util.Date] for value '2020-02-06'; nested exception is java.lang.IllegalArgumentException]解决

今天做springbook项目前端输入日期传到数据库保存报了一下错误

Whitelabel Error Page

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

Sun Feb 09 16:31:32 CST 2020

There was an unexpected error (type=Bad Request, status=400).

Validation failed for object='book'. Error count: 1

org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors Field error in object 'book' on field 'bookDate': rejected value [2020-02-06]; codes [typeMismatch.book.bookDate,typeMismatch.bookDate,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [book.bookDate,bookDate]; arguments []; default message [bookDate]]; default message [Failed to convert value of type 'java.lang.String[]' to required type 'java.util.Date'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.util.Date] for value '2020-02-06'; nested exception is java.lang.IllegalArgumentException] at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.constructAttribute(ModelAttributeMethodProcessor.java:317) at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:224) at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:85) at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:139) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:127) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134)。。。

前端代码：

<form th:action="@{/toAdd}">
                <h2>添加图书信息</h2>
                书名：<input type="text" name="bookName"/><br/>
                简介：<input type="text" name="bookNote"/><br/>
                作者：<input type="text" name="bookAuthor"/><br/>
                价格：<input type="text" name="bookMoney"/><br/>
                出版日期：<input type="date" name="bookDate"/><br/>
                <input type="submit" value="添加"/>
            </form>

数据库：

百度上说的方法差不多，就是在对应controller中添加一下代码

 @InitBinder
    protected void initBinder(WebDataBinder binder) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
    }

我试了一下果然可以！

代码如下：

@RequestMapping("/toAdd")
    public String toAdd(Book book,Model model) {

        bookService.addBook(book);
        return "redirect:/toQueryAll";

    }
    @InitBinder
    protected void initBinder(WebDataBinder binder) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
    }

注意这里的

Date.class是

import java.util.Date;包下的