Spring ListFactoryBean实例 - Spring教程

ListFactoryBean”类为开发者提供了一种在Spring的bean配置文件中创建一个具体的列表集合类(ArrayList和LinkedList)。这里有一个 ListFactoryBean 示例,在运行时它将实例化一个ArrayList,并注入到一个 bean 属性。

package com.yiibai.common;

import java.util.List;

public class Customer 
{
    private List lists;
    //...
}

Spring bean配置文件 - applicationContext.html 文件的内容。

<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="CustomerBean" class="com.yiibai.common.Customer">
        <property name="lists">
            <bean class="org.springframework.beans.factory.config.ListFactoryBean">
                <property name="targetListClass">
                    <value>java.util.ArrayList</value>
                </property>
                <property name="sourceList">
                    <list>
                        <value>one</value>
                        <value>2</value>
                        <value>three</value>
                    </list>
                </property>
            </bean>
        </property>
    </bean>

</beans>

另外,还可以使用 util 模式和 来达到同样的目的。

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util-2.5.xsd">

    <bean id="CustomerBean" class="com.yiibai.common.Customer">
        <property name="lists">
            <util:list list-class="java.util.ArrayList">
                <value>one</value>
                <value>2</value>
                <value>three</value>
            </util:list>
        </property>
    </bean>

</beans>

请记住要包函 util 模式,否则会出现下面的错误

Caused by: org.xml.sax.SAXParseException: 
    The prefix "util" for element "util:list" is not bound.

执行,查看结果:

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(
                "applicationContext.xml");

        Customer cust = (Customer) context.getBean("CustomerBean");
        System.out.println(cust);

    }
}

输出结果

Customer [lists=[one, 2, three]] Type=[class java.util.ArrayList]

在运行时实例化ArrayList并注入列表到客户的属性。下载代码 – http://pan.baidu.com/s/1i4aK26h