这一个Spring例子向您展示如何为bean属性注入一个“日期”。
package cn.zhuir.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="cn.zhuir.common.Customer"> <property name="date" value="2015-12-31" /> </bean> </beans>
执行-运行程序输出
package cn.zhuir.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="cn.zhuir.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="cn.zhuir.common.Customer"> <property name="date" value="2015-12-31" /> </bean> </beans>