这一章节我们来讨论一下如何建立集合以及访问集合的元素?
1.建立集合?
(1)domain
蛋糕类:
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20; public class Cake { private String name = ""; private double size = 0; public String getName() { return name; } public void setName(String name) { this.name = name; } public double getSize() { return size; } public void setSize(double size) { this.size = size; } }
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsdhttp://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"><util:list id="cakes"><bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake"p:name="blueberry cheese cake" p:size="5" scope="prototype" /><bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake"p:name="chocolate cheese cake" p:size="6" scope="prototype" /><bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake"p:name="banana oatmel mousse cake" p:size="7" scope="prototype" /><bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake"p:name="vanilla eclair" p:size="8" scope="prototype" /><bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake"p:name="ligueur perfumed triplet cake" p:size="5.5" scope="prototype" /></util:list></beans>
<1>引入util的命名空间,需要在头部加上:
xmlns:util="http://www.springframework.org/schema/util"以及:
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd<2>使用<util:list/>标签,当spring容器启动的时候,spring会帮我们生成上面的列表
<3>除了<util:list/>还有<util:set/>和<util:map/>等常用容器
<4>Bean由于在容器里面,因此不需要id,当做内部类来引入
2.访问集合的元素
(1)domain
蛋糕类:(沿用上面的代码)
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20; public class Cake { private String name = ""; private double size = 0; public String getName() { return name; } public void setName(String name) { this.name = name; } public double getSize() { return size; } public void setSize(double size) { this.size = size; } }
厨师类:(为了方便,我们减轻一下属性)
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20; public class Chief { private Cake cake = null; private String name = ""; public Cake getCake() { return cake; } public String getName() { return name; } public Cake makeOneCake() { return cake; } public void setCake(Cake cake) { this.cake = cake; } public void setName(String name) { this.name = name; } }
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20; import java.util.ArrayList; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationContext; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = { "/com/raylee/my_new_spring/my_new_spring/ch01/topic_1_20/ApplicationContext-test.xml" }) public class CakeTest { @Autowired private ApplicationContext applicationContext; @Test public void testChief() { @SuppressWarnings("unchecked") ArrayList<Cake> cakes = (ArrayList<Cake>) applicationContext.getBean("cakes"); System.out.println(cakes.size()); Chief jack=applicationContext.getBean(Chief.class); Cake cake =jack.getCake(); System.out.println(cake.getName()); } }
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <util:list id="cakes"> <bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake" p:name="blueberry cheese cake" p:size="5" scope="prototype" /> <bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake" p:name="chocolate cheese cake" p:size="6" scope="prototype" /> <bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake" p:name="banana oatmel mousse cake" p:size="7" scope="prototype" /> <bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake" p:name="vanilla eclair" p:size="8" scope="prototype" /> <bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Cake" p:name="ligueur perfumed triplet cake" p:size="5.5" scope="prototype" /> </util:list> <bean id="jack" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_20.Chief" p:name="jack"> <property name="cake" value="#{cakes[1]}" /> </bean> </beans>
配置文件的注意点:
<1>我们需要使用前面的#{}表达式
<2>在属性注入的时候,不再是ref,因为找不到相应的bean,直接使用value,因为我们通过表达式返回的是一个对象
测试输出:
5
chocolate cheese cake
总结:这一章节主要介绍了如何建立集合以及访问集合的元素。
目录:http://blog.csdn.net/raylee2007/article/details/50611627
我的github:https://github.com/raylee2015/my_new_spring