Spring注入日期到bean属性-CustomDateEditor

这一个Spring例子向您展示如何为bean属性注入一个“日期”。

package com.yiibai.common;

import java.util.Date;

public class Customer {

	Date date;

	public Date getDate() {

		return date;

	}

	public void setDate(Date date) {

		this.date = date;

	}

	@Override

	public String toString() {

		return "Customer [date=" + date + "]";

	}

}

bean配置文件

<beans xmlns="http://www.springframework.org/schema/beans"

	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-2.5.xsd">

	<bean id="customer" class="com.yiibai.common.Customer">

		<property name="date" value="2015-12-31" />

	</bean>

</beans>

执行-运行程序输出

package com.yiibai.common;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {

	public static void main(String[] args) {

		ApplicationContext context = new ClassPathXmlApplicationContext(

				"SpringBeans.xml");

		Customer cust = (Customer) context.getBean("customer");

		System.out.println(cust);

	}

}

可能会遇到如下错误信息：

Caused by: org.springframework.beans.TypeMismatchException:

	Failed to convert property value of type [java.lang.String] to

	required type [java.util.Date] for property 'date'; 

nested exception is java.lang.IllegalArgumentException:

	Cannot convert value of type [java.lang.String] to

	required type [java.util.Date] for property 'date':

	no matching editors or conversion strategy found

解决办法

在Spring中，可以通过两种方式注入日期：

1. Factory bean

声明一个dateFormat bean，在“customer” Bean，引用 “dateFormat” bean作为一个工厂bean。该工厂方法将调用SimpleDateFormat.parse()自动转换成字符串Date对象。

<beans xmlns="http://www.springframework.org/schema/beans"

	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-2.5.xsd">

	<bean id="dateFormat" class="java.text.SimpleDateFormat">

		<constructor-arg value="yyyy-MM-dd" />

	</bean>

	<bean id="customer" class="com.yiibai.common.Customer">

		<property name="date">

			<bean factory-bean="dateFormat" factory-method="parse">

				<constructor-arg value="2015-12-31" />

			</bean>

		</property>

	</bean>

</beans>

2. CustomDateEditor

声明一个 CustomDateEditor 类将字符串转换成 java.util.Date。

<bean id="dateEditor"

	   class="org.springframework.beans.propertyeditors.CustomDateEditor">

		<constructor-arg>

			<bean class="java.text.SimpleDateFormat">

				<constructor-arg value="yyyy-MM-dd" />

			</bean>

		</constructor-arg>

		<constructor-arg value="true" />

	</bean>

并声明另一个“CustomEditorConfigurer”，使 Spring转换 bean 属性，其类型为java.util.Date。

<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">

		<property name="customEditors">

			<map>

				<entry key="java.util.Date">

					<ref local="dateEditor" />

				</entry>

			</map>

		</property>

	</bean>

bean配置文件的完整例子(applicationContext.xml)。

<beans xmlns="http://www.springframework.org/schema/beans"

	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-2.5.xsd">

	<bean id="dateEditor"

		class="org.springframework.beans.propertyeditors.CustomDateEditor">

		<constructor-arg>

			<bean class="java.text.SimpleDateFormat">

				<constructor-arg value="yyyy-MM-dd" />

			</bean>

		</constructor-arg>

		<constructor-arg value="true" />

	</bean>

	<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">

		<property name="customEditors">

			<map>

				<entry key="java.util.Date">

					<ref local="dateEditor" />

				</entry>

			</map>

		</property>

	</bean>

	<bean id="customer" class="com.yiibai.common.Customer">

		<property name="date" value="2015-12-31" />

	</bean>

</beans>

下载代码 – http://pan.baidu.com/s/1bxZyfO

http://www.yiibai.com/spring/spring-how-to-pass-a-date-into-bean-property-customdateeditor.html

巴特西

Spring注入日期到bean属性-CustomDateEditor

解决办法

1. Factory bean

2. CustomDateEditor

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