显示目录

List, Set, Map, Properties 注入

注入 List

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<bean id="listExample" class="com.xtuer.beans.CollectionHolder">
<property name="list">
<list> <!--表示是 list-->
<value>Gut</value>
<value>Good</value>
<value>没问题</value>
</list>
</property>
</bean>

<list> 里不只是可以使用 <value>,还可以使用 <ref bean=""><bean class="ClassName">,如下

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<bean id="listExample" class="com.xtuer.beans.CollectionHolder">
<property name="list">
<list> <!--表示是 list-->
<value>Gut</value>
<value>Good</value>
<value>没问题</value>
<ref bean="user"/>
<bean class="com.xtuer.beans.User"/>
</list>
</property>
</bean>

注入数组

数组的注入和 List 完全一样

注入 Set

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<bean id="setExample" class="com.xtuer.beans.CollectionHolder">
<property name="set">
<set> <!--表示是 set-->
<value>Gut</value>
<value>Good</value>
<value>没问题</value>
</set>
</property>
</bean>

Set 的注入和 List 一样,只是把 <list> 换成 <set>

注入 Map

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<bean id="mapExample" class="com.xtuer.beans.CollectionHolder">
<property name="map">
<map> <!--表示是 map-->
<entry key="German" value="Gut"/>
<entry key="English" value="Good"/>
<entry key="Chinese" value="没问题"/>
</map>
</property>
</bean>

<entry> 里还可以是 <value-ref><bean>,如下

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<bean id="mapExample" class="com.xtuer.beans.CollectionHolder">
<property name="map">
<map> <!--表示是 map-->
<entry key="German" value="Gut"/>
<entry key="English" value="Good"/>
<entry key="Chinese" value="没问题"/>
<entry key="user" value-ref="user"/>
<entry key="customer">
<bean class="com.xtuer.beans.Customer">
<constructor-arg value="Alice"/>
<constructor-arg value="40"/>
</bean>
</entry>
</map>
</property>
</bean>

注入 Properties

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<bean id="propsExample" class="com.xtuer.beans.CollectionHolder">
<property name="props">
<props> <!--表示是 properties-->
<prop key="German">Gut</prop> <!--只能是字符串,不能是 ref, bean-->
<prop key="English">Good</prop>
<prop key="Chinese">没问题</prop>
</props>
</property>
</bean>

由于 Properties 的 value 只能是字符串,所以 <prop> 的值只能是字符串,不能是 <ref><bean>

spring-beans.xml

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<?xml version="1.0" encoding="UTF-8"?>
<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.xsd">
<bean id="user" class="com.xtuer.beans.User"/>
<bean id="arrayExample" class="com.xtuer.beans.CollectionHolder">
<property name="array">
<list>
<value>1</value>
<value>2</value>
<value>3</value>
</list>
</property>
</bean>
<bean id="listExample" class="com.xtuer.beans.CollectionHolder">
<property name="list">
<list>
<value>Gut</value>
<value>Good</value>
<value>没问题</value>
<ref bean="user"/>
<bean class="com.xtuer.beans.User"/>
</list>
</property>
</bean>
<bean id="setExample" class="com.xtuer.beans.CollectionHolder">
<property name="set">
<set>
<value>Gut</value>
<value>Good</value>
<value>没问题</value>
</set>
</property>
</bean>
<bean id="mapExample" class="com.xtuer.beans.CollectionHolder">
<property name="map">
<map>
<entry key="German" value="Gut"/>
<entry key="English" value="Good"/>
<entry key="Chinese" value="没问题"/>
<entry key="user" value-ref="user"/>
<entry key="customer">
<bean class="com.xtuer.beans.Customer">
<constructor-arg value="Alice"/>
<constructor-arg value="40"/>
</bean>
</entry>
</map>
</property>
</bean>
<bean id="propsExample" class="com.xtuer.beans.CollectionHolder">
<property name="props">
<props>
<prop key="German">Gut</prop>
<prop key="English">Good</prop>
<prop key="Chinese">没问题</prop>
</props>
</property>
</bean>
</beans>

CollectionHolder

CollectionHolder 的属性有 list, set, map, properties

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package com.xtuer.beans;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class CollectionHolder {
private List<Object> list;
private Set<Object> set;
private Map<String, Object> map;
private Properties props;
private int[] array;
public List<Object> getList() {
return list;
}
public void setList(List<Object> list) {
this.list = list;
}
public Set<Object> getSet() {
return set;
}
public void setSet(Set<Object> set) {
this.set = set;
}
public Map<String, Object> getMap() {
return map;
}
public void setMap(Map<String, Object> map) {
this.map = map;
}
public Properties getProps() {
return props;
}
public void setProps(Properties props) {
this.props = props;
}
public int[] getArray() {
return array;
}
public void setArray(int[] array) {
this.array = array;
}
}

CollectionTest

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import com.xtuer.beans.CollectionHolder;
import com.xtuer.util.CommonUtils;
import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class CollectionTest {
private static ApplicationContext context;
@BeforeClass
public static void setup() {
context = new ClassPathXmlApplicationContext("spring-beans.xml");
}
@Test
public void testArray() {
CollectionHolder holder = context.getBean("arrayExample", CollectionHolder.class);
CommonUtils.output(holder.getArray());
CommonUtils.output(holder.getArray().getClass());
}
@Test
public void testList() {
CollectionHolder holder = context.getBean("listExample", CollectionHolder.class);
CommonUtils.output(holder.getList());
CommonUtils.output(holder.getList().getClass());
}
@Test
public void testSet() {
CollectionHolder holder = context.getBean("setExample", CollectionHolder.class);
CommonUtils.output(holder.getSet());
CommonUtils.output(holder.getSet().getClass());
}
@Test
public void testMap() {
CollectionHolder holder = context.getBean("mapExample", CollectionHolder.class);
CommonUtils.output(holder.getMap());
CommonUtils.output(holder.getMap().getClass());
}
@Test
public void testProps() {
CollectionHolder holder = context.getBean("propsExample", CollectionHolder.class);
CommonUtils.output(holder.getProps());
CommonUtils.output(holder.getProps().getClass());
}
}