Spring MVC 进行数据类型转换的三种方式

1.使用ConversionService 

<?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:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context 
		http://www.springframework.org/schema/context/spring-context.xsd
		http://www.springframework.org/schema/mvc 
		http://www.springframework.org/schema/mvc/spring-mvc.xsd">
	
	<!-- 配置处理器Handle，映射为“/hello”的请求 -->
	<!-- <bean name="/hello" class="com.springmvc.controller.HelloController" /> -->
	
	<mvc:annotation-driven conversion-service="conversionService"/>
	<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
		<property name="converters">
			<list>
				<bean class="com.springmvc.converter.StringToDateConverter" p:datePattern="yyyy-MM-dd"></bean>
			</list>
		</property>
	</bean>
	
	<!-- 配置自动扫描的基包 -->
	<context:component-scan base-package="com.springmvc"/>	
	
	<!-- 配置视图解析器，将控制器方法返回的逻辑视图解析为物理视图 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
		<!-- <property name="prefix" value="/ch06/"></property> -->
		<!-- <property name="prefix" value="/ch07/" /> -->
		<property name="prefix" value="/ch09/" />
		<property name="suffix" value=".jsp"></property>
	</bean>
	
	<!-- 直接页面转发 -->
	<mvc:view-controller path="success" view-name="success"/>
	<mvc:view-controller path="index" view-name="index"/>
	
	<bean class="org.springframework.web.servlet.view.BeanNameViewResolver">
		<property name="order" value="50"></property>
	</bean>
	
	<mvc:default-servlet-handler/>
	

</beans>

package com.springmvc.converter;

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

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

public class StringToDateConverter implements Converter<String, Date> {
	private String datePattern;

	public void setDatePattern(String datePattern) {
		this.datePattern = datePattern;
	}

	@Override
	public Date convert(String date) {		
		try {
			SimpleDateFormat dateFormat=new SimpleDateFormat(datePattern);
			return dateFormat.parse(date);	//将字符串性转换成Date类型
		} catch (Exception e) {			
			e.printStackTrace();
			System.out.println("日期转换失败");
			return null;
		}		
	}
	
	
}

2.使用@InitBinder注解 和  WebDataBinder 类

	@InitBinder
	public void initBinder(WebDataBinder binder) {
		SimpleDateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd");
		binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
	}

 3.使用@DateTimeFormat注解 

import org.springframework.format.annotation.DateTimeFormat;

public class User {

	@DateTimeFormat(pattern="yyyy-MM-dd")
	private Date birthday;

    ...

附：数据类型转换图