单个日期注入

<?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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <context:component-scan base-package="com.chentianyu.controller" />
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/admin/" />
        <property name="suffix" value=".jsp" />
    </bean>
    <mvc:default-servlet-handler />
    <mvc:annotation-driven /><!--ajax和日期都要用它-->
</beans>

你不知道用户会输入什么样子的，所以我们可以限制选择

<form action="${pageContext.request.contextPath}/myDate">
    日期:<input type="date" name="myDate" /><br>
    <input type="submit" value="提交">
</form>

package com.chentianyu.controller;

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.Date;

@Controller
public class MyDateAction {
    /**
     * 日期:<input type="date" name="myDate" /><br>
     * @return
     */
    @RequestMapping("/myDate")
    public String myDate(@DateTimeFormat(pattern = "yyyy-MM-dd"/*将字符串转为日期注入进去*/) Date myDate){
        System.out.println(myDate);
        return "show";
    }
}

使用格式刷

package com.chentianyu.controller;

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

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

@Controller
public class MyDateAction {
    SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
    /**
     * 日期:<input type="date" name="myDate" /><br>
     * @return
     */
    @RequestMapping("/myDate")
    public String myDate(@DateTimeFormat(pattern = "yyyy-MM-dd"/*将字符串转为日期注入进去*/) Date myDate){
        System.out.println(myDate);
        System.out.println(sf.format(myDate));
        return "show";
    }
}

package com.chentianyu.controller;

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

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

@Controller
public class MyDateAction {
    SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
    /**
     * 日期:<input type="date" name="myDate" /><br>
     * @return
     */
    @RequestMapping("/myDate")
    public String myDate(@DateTimeFormat(pattern = "yyyy-MM-dd"/*将字符串转为日期注入进去*/) Date myDate){
        System.out.println(myDate);
        System.out.println(sf.format(myDate));
        return "show";
    }
}

这种写法的弊端:注入多个日期就得重复的使用**@DateTimeFormat(pattern = "yyyy-MM-dd")**,我们希望有个全局的代码:所有的日期全都自动转化