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

Dream城堡 2022-01-07 18:02:43 阅读数:924

解决 failed convert value type

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

發生這一錯誤的主要原因是Controller類中需要接收的是Date類型,但是在頁面端傳過來的是String類型,最終導致了這個錯誤。

這裏提供兩種解决方案,一種是局部轉換,一種是全局轉換。

<form action="login.do" method="post">
<input type="text" name="birthday" value="2017-07-12 22:04:00">
<input type="submit" value="提交">
</form>

一.局部轉換

@Controller
public class UserController{
@RequestMapping(value="/login.do")
public String login(String username,Date birthday){
System.out.println("________");
return "";
}
//只需要加上下面這段即可,注意不能忘記注解
@InitBinder
public void initBinder(WebDataBinder binder, WebRequest request) {
//轉換日期 注意這裏的轉化要和傳進來的字符串的格式一直 如2015-9-9 就應該為yyyy-MM-dd
DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));// CustomDateEditor為自定義日期編輯器
}
}

二.全局轉換

1.創建CustomDate類實現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;
public class CustomDate implements WebBindingInitializer{
@Override
public void initBinder(WebDataBinder binder, WebRequest request) {
// TODO Auto-generated method stub
//轉換日期
DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
}
}

2.在Spring-MVC.xml中配置日期轉換

<?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>
<!-- 日期轉換 -->
<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>
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