Spring inject Date into bean property – CustomDateEditor

转载自：http://www.mkyong.com/spring/spring-how-to-pass-a-date-into-bean-property-customdateeditor/

Spring example to show you how to inject a “Date” into bean property.

package com.mkyong.common; import java.util.Date; public class Customer { Date date; public Date getDate() {return date;} public void setDate(Date date) {this.date = date;} @Overridepublic String toString() {return "Customer [date=" + date + "]";} }

Bean configuration file

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="customer" class="com.mkyong.common.Customer"><property name="date" value="2010-01-31" /></bean> </beans>

Run it

package com.mkyong.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); }}

You will encounter follow error messages :

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] torequired type [java.util.Date] for property 'date': no matching editors or conversion strategy found

Solution

In Spring, you can inject a Date via two methods :

1. Factory bean

Declare a dateFormat bean, in “customer” bean, reference “dateFormat” bean as a factory bean. The factory method will callSimpleDateFormat.parse() to convert String into Date object automatically.

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://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.mkyong.common.Customer"><property name="date"><bean factory-bean="dateFormat" factory-method="parse"><constructor-arg value="2010-01-31" /></bean></property></bean> </beans>

2. CustomDateEditor

Declares a CustomDateEditor class to convert String into 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>

And declares another “CustomEditorConfigurer”, to make Spring convert bean properties whose type isjava.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>

Full example of bean configuration file.

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://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.mkyong.common.Customer"><property name="date" value="2010-02-31" /></bean> </beans>

Download Source Code

Download It – Spring-CustomDateEditor-Example.zip (5KB)