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这一章节我们来讨论一下注入List或Set。
我们章节举的例子是不同的厨师使用不同个烤炉制作出不同的蛋糕。
1.domain
蛋糕类:(沿用前面章节的蛋糕类)
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11; public class Cake { private final int id = index++; private static int index = 0; 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; } public int getId() { return id; } @Override public String toString() { return " create the cake,its id:" + id + ", size:" + size + " inch ,name:" + name; } }
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11; import java.util.ArrayList; import java.util.HashSet; import java.util.Iterator; public class Chief { private static int index = 0; private ArrayList<Cake> cakes = null; private final int id = index++; private String name = ""; private HashSet<Oven> ovens = null; public ArrayList<Cake> getCakes() { return cakes; } public int getId() { return id; } public String getName() { return name; } public HashSet<Oven> getOvens() { return ovens; } public ArrayList<Cake> makeCakes() { for (Iterator<Cake> iterator = cakes.iterator(); iterator.hasNext();) { Cake cake = iterator.next(); System.out.println(name + cake); } return getCakes(); } public void userOvens() { for (Iterator<Oven> iterator = ovens.iterator(); iterator.hasNext();) { Oven oven = iterator.next(); System.out.println("use " + oven); } } public void setCakes(ArrayList<Cake> cakes) { this.cakes = cakes; } public void setName(String name) { this.name = name; } public void setOvens(HashSet<Oven> ovens) { this.ovens = ovens; } }
(1)为了使用不同的烤炉,我们加入了ovens,由于实际情况当中只有大小烤炉各一个,所以我们这里只是使用set,而不是使用list
(2)为了能够做出不同的蛋糕,我们使用一个list来放置不同的蛋糕,而这里允许重复,因此这里使用list
(3)为了输出方便,我在userOvens和makeCakes里面直接输出数据
烤炉类:(没什么变化,只是去掉id,增加了名称属性,这样方便输出)
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11; public class Oven { private String name = ""; @Override public String toString() { return name; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11; 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_11/ApplicationContext-test.xml" }) public class ChiefTest { @Autowired private ApplicationContext applicationContext; @Test public void testChief() { Chief jack = (Chief) applicationContext.getBean("jack"); jack.userOvens(); jack.makeCakes(); Chief rose = (Chief) applicationContext.getBean("rose"); rose.userOvens(); rose.makeCakes(); } }
3.配置文件(重点,也是体现代码重用的地方)
<?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" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.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"> <bean id="blueberryCheeseCake" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Cake" p:name="blueberry cheese cake" p:size="5" scope="prototype"> </bean> <bean id="chocolateCheeseCake" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Cake" p:name="chocolate cheese cake" p:size="6" scope="prototype"> </bean> <bean id="bananaAatmelMousseCake" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Cake" p:name="banana oatmel mousse cake" p:size="7" scope="prototype"> </bean> <bean id="vanillaEclair" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Cake" p:name="vanilla eclair" p:size="8" scope="prototype"> </bean> <bean id="ligueurPerfumedTripletCake" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Cake" p:name="ligueur perfumed triplet cake" p:size="5.5" scope="prototype"> </bean> <bean id="bigOven" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Oven" p:name="bigOven" /> <bean id="smallOven" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Oven" p:name="smallOven" /> <bean id="jack" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Chief" p:name="jack"> <property name="ovens"> <set> <ref bean="bigOven" /> <ref bean="bigOven" /> <ref bean="smallOven" /> </set> </property> <property name="cakes"> <list> <ref bean="blueberryCheeseCake" /> <ref bean="chocolateCheeseCake" /> <ref bean="bananaAatmelMousseCake" /> <ref bean="vanillaEclair" /> </list> </property> </bean> <bean id="rose" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_11.Chief" p:name="rose"> <property name="ovens"> <set> <ref bean="smallOven" /> </set> </property> <property name="cakes"> <list> <ref bean="vanillaEclair" /> <ref bean="ligueurPerfumedTripletCake" /> <ref bean="chocolateCheeseCake" /> </list> </property> </bean> </beans>
(1)我们利用一个蛋糕类,通过名称等属性的变化,来创建不同类别的蛋糕对象
(2)我们利用一个烤炉类,通过名称等属性的变化,来创建不同类别的烤炉对象
(3)我们利用一个厨师类,通过名称等属性的变化,来创建不同类别的厨师对象
注:上面这几点比较能够体现代码的复用
(4)每个蛋糕Bean都需要使用prototype的作用域,这样才能够每次创建的都是不同的蛋糕对象,不然后面get蛋糕的时候就会出现两个相同id的蛋糕,这个明显是不符合实际情况的。
(5)但是烤炉的情况不一样,由于对于面包铺来说,烤炉的数量是一定的,不能够出现多个烤炉,因此他们必须使用默认的单例模式
(6)配置厨师里面的烤炉属性时,我们使用了set,这样即便像上面配置多了,也不会重复出现,因为这个collection具备了set的特性;而配置蛋糕属性的时候我们使用list,由于每一个蛋糕都不一样,因此使用list比较合适
(7)list和set除了上面的能够放入Bean之外,还可以放入value,这个时候只需要使用<value/>标签即可,不是使用<ref/>,但是由于注入值比较少,因此不作详细说明。
测试输出:
use bigOven
use smallOven
jack create the cake,its id:0, size:5.0 inch ,name:blueberry cheese cake
jack create the cake,its id:1, size:6.0 inch ,name:chocolate cheese cake
jack create the cake,its id:2, size:7.0 inch ,name:banana oatmel mousse cake
jack create the cake,its id:3, size:8.0 inch ,name:vanilla eclair
use smallOven
rose create the cake,its id:4, size:8.0 inch ,name:vanilla eclair
rose create the cake,its id:5, size:5.5 inch ,name:ligueur perfumed triplet cake
rose create the cake,its id:6, size:6.0 inch ,name:chocolate cheese cake
总结:这一章节我们主要介绍了注入List或Set。
目录:http://blog.csdn.net/raylee2007/article/details/50611627
我的github:https://github.com/raylee2015/my_new_spring
从头认识Spring-1.11 注入List或Set(这个例子比较体现代码复用)
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原文地址:http://blog.csdn.net/raylee2007/article/details/50618962