解决：Failed to convert value of type ‘java.lang.String‘ to required type ‘java.util.Date‘；

快来打我* 2021-09-26 06:04 266阅读 0赞

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发生这一错误的主要原因是Controller类中需要接收的是Date类型，但是在页面端传过来的是String类型，最终导致了这个错误。

这里提供两种解决方案，一种是局部转换，一种是全局转换。

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## 一.局部转换 ##

@Controller
    public class UserController{
    	
    	@RequestMapping(value="/login.do")
    	public String login(String username,Date birthday){
    		System.out.println("________");
    		return "";
    	}
    
            //只需要加上下面这段即可，注意不能忘记注解
    	@InitBinder
    	public void initBinder(WebDataBinder binder, WebRequest request) {
    		
    		//转换日期
    		DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    		binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));// CustomDateEditor为自定义日期编辑器
    	}
    }

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## 二.全局转换 ##

1.创建CustomDate类实现WebBindingInitializer

import java.text.DateFormat;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import org.springframework.beans.propertyeditors.CustomDateEditor;
    import org.springframework.web.bind.WebDataBinder;
    import org.springframework.web.bind.support.WebBindingInitializer;
    import org.springframework.web.context.request.WebRequest;
    
    /**
     * @作者：JackHisen(GWD)
     * @项目名：shoppingmall
     * @时间：2017-7-12 下午10:39:10
     * @version 1.0
     */
    public class CustomDate implements WebBindingInitializer{
    
    	@Override
    	public void initBinder(WebDataBinder binder, WebRequest request) {
    		// TODO Auto-generated method stub
    		//转换日期
    		DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    		binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
    	}
    }

2.在Spring-MVC.xml中配置日期转换

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
    	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xsi:schemaLocation="
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
         http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
    	<context:component-scan base-package="com.gwd.shopping" use-default-filters="false">
    		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    	</context:component-scan>
    	
    	
    	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    		<property name="webBindingInitializer">
    			<bean class="com.gwd.shopping.core.web.CustomDate"/>
    		</property>
    	</bean>
    	
    	<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		<property name="prefix" value="/WEB-INF/back_page/"/>
    		<property name="suffix" value=".jsp"/>
    	</bean>
    </beans>

[Center]: /images/20210923/0b920f0a82164b88ab9cd2d8d74cef9d.png
[Center 1]: /images/20210923/500586f536b24aea97f6108c56086bdb.png