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

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。

<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 注意这里的转化要和传进来的字符串的格式一直 如2015-9-9 就应该为yyyy-MM-dd
        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
}

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;
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>
    <!-- 日期转换 -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="webBindingInitializer">
            <bean class="com.gwd.shopping.core.web.CustomDate"/>
        </property>