11、spring的bean基础（3）

2019-11-08 02:27:03

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11、sPRing的bean基础（3）

在本文中，主要介绍的知识点有以下三个

ListFactoryBeanSetFactoryBeanMapFactoryBean

现项目中存在一个实体类，将用于以下三个例子的演示 HelloWorld.java

public class HelloWorld{ private List list; private Set set; private Map map; //.....}

ListFactoryBean示例 在spring bean配置文件中

<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="HelloWorld" class="com.main.HelloWorld"> <property name="list"> <bean class="org.springframework.beans.factory.config.ListFactoryBean"> <property name="targetListClass"> <value>java.util.ArrayList</value> </property> <property name="sourceList"> <list> <value>hello</value> <value>1</value> <value>three</value> </list> </property> </bean> </property> </bean></beans>

还可以使用下方式:

<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="list"> <util:list list-class="java.util.ArrayList"> <value>Hello</value> <value>1</value> <value>three</value> </util:list> </property> </bean></beans>

如果你不把util：list模式包含进配置文件中：或许会出现以下错误：

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

SetFactoryBean实例

<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="HelloWorld" class="com.main.HelloWorld"> <property name="set"> <bean class="org.springframework.beans.factory.config.SetFactoryBean"> <property name="targetSetClass"> <value>java.util.HashSet</value> </property> <property name="sourceSet"> <list> <value>one</value> <value>2</value> <value>three</value> </list> </property> </bean> </property> </bean></beans>

也可以使用以下模式：

MapFactoryBean实例

<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="HelloWorld" class="com.main.HelloWorld"> <property name="map"> <bean class="org.springframework.beans.factory.config.MapFactoryBean"> <property name="targetMapClass"> <value>java.util.HashMap</value> </property> <property name="sourceMap"> <map> <entry key="Key1" value="one" /> <entry key="Key2" value="two" /> <entry key="Key3" value="three" /> </map> </property> </bean> </property> </bean></beans>

也可以使用以下方式：

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