package com.hope.utils;

import org.springframework.core.convert.converter.Converter;
import org.springframework.util.StringUtils;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
   第一步定义一个类型转换器的类
 * @author newcityman
 * @date 2019/11/26 - 19:57
 */
public class StringToDateConverter implements Converter<String,Date>{

    /**
     *
     * @param source
     * @return
     */
    @Override
    public Date convert(String source) {
        if(StringUtils.isEmpty(source)){
            throw new RuntimeException("参数不能为空，请输入一个参数。");
        }
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        try {
           return df.parse(source);
        } catch (ParseException e) {
           throw  new RuntimeException("日期转换失败，请联系管理员。");
        }
    }
}

//  第二步，在springmvc.xml中配置自定义类型转换器

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">

    <!--指定spring扫描的包-->
    <context:component-scan base-package="com.hope"></context:component-scan>
    <!--视图解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--配置自定义类型转换器-->
    <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.hope.utils.StringToDateConverter"></bean>
            </set>
        </property>
    </bean>

    <!--开启springmvc框架注解的支持,包含开启处理器映射器和处理器适配器-->
    <mvc:annotation-driven conversion-service="conversionService"/>
</beans>