spring依賴注入（二）-java注入，xml注入，混合注入
阿新 • • 發佈：2018-12-16
java注入
@Configuration
public class CDPlayerConfig {
@Bean
public CompactDisc compactDisc(){
return new SgtPeppers();
}
@Bean
public CDPlayer cdPlayer(CompactDisc cd){
return new CDPlayer(cd);
}
}
在測試類中
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes = CDPlayerConfig.class)//此處用這樣的，當然，classes是可以寫多個 public class CDPlsyerTest { @Autowired private MediaPlayer player; @Test public void play(){ player.play(); } }
xml注入 首先了解： c名稱空間簡化構造器的屬性賦值 p名稱空間簡化set方法的屬性賦值
1.簡單版： 第一種：構造器注入
<bean id="compactDisc" class="com.husky.spring.collections.BlankDisc"> <constructor-arg value="Sgt. Pepper's Lonely Hearts Club Band"/> <constructor-arg value="The Beatles"/> <constructor-arg> <list> <value>Sgt. Pepper's Lonely Hearts Club Band</value> <value>With a Little Help from My Friend</value> <value>Lucy in the sky with Diamonds</value> <value>Getting Better</value> <value>Fixing a Hole</value> <value>She's leaving Home</value> </list> </constructor-arg> </bean> <bean id="cdPlayer" class="com.husky.spring.CDPlayer"> <constructor-arg ref="compactDisc"/>//ref是引用 </bean>
第二種：set方法注入
<bean id="compactDisc" class="soundsystem.properties.BlankDisc"> <property name="title" value="Sgt. Pepper's Lonely Hearts Club Band" /> <property name="artist" value="The Beatles" /> <property name="tracks"> <list> <value>Sgt. Pepper's Lonely Hearts Club Band</value> <value>With a Little Help from My Friends</value> <value>Lucy in the Sky with Diamonds</value> <value>Getting Better</value> <value>Fixing a Hole</value> <value>She's Leaving Home</value> <value>Being for the Benefit of Mr. Kite!</value> <value>Within You Without You</value> <value>When I'm Sixty-Four</value> <value>Lovely Rita</value> <value>Good Morning Good Morning</value> <value>Sgt. Pepper's Lonely Hearts Club Band (Reprise)</value> <value>A Day in the Life</value> </list> </property> </bean>
2.簡化版： 構造器c名稱空間
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:c="http://www.springframework.org/schema/c"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="cd" class="com.husky.spring.BlankDisc"
c:_0="Sgt. pepper's lonely Hearts Club band"
c:_1="The Beatles"/>
<bean id="cdplayer" class="com.husky.spring.CDPlayer"
c:cd-ref="cd"/>
</beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="compactDisc"
class="com.husky.spring.properties.BlankDisc"
p:title="Sgt. pepper's Lonely Hearts Club Band"
p:artist="The Beatles">
<property name="tracks">
<list>
<value>Sgt. Pepper's Lonely Hearts Club Band</value>
<value>With a Little Help from My Friends</value>
<value>Lucy in the Sky with Diamonds</value>
<value>Getting Better</value>
<value>Fixing a Hole</value>
<value>She's Leaving Home</value>
<value>Being for the Benefit of Mr. Kite!</value>
<value>Within You Without You</value>
<value>When I'm Sixty-Four</value>
<value>Lovely Rita</value>
<value>Good Morning Good Morning</value>
<value>Sgt. Pepper's Lonely Hearts Club Band (Reprise)</value>
<value>A Day in the Life</value>
</list>
</property>
</bean>
<bean id="cdPlayer"
class="com.husky.spring.properties.CDPlayer"
p:compactDisc-ref="compactDisc"/>
</beans>
記得匯入xmlns:p=“http://www.springframework.org/schema/p” 集合：util名稱空間 spring的配置檔案中util名稱空間類似於java.util包類對應，util名稱空間提供了集合相關的配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">
<bean id="compactDisc"
class="com.husky.spring.properties.BlankDisc"
p:title="sgt. Pepper's Lonely Hearts Club Band"
p:artist="The Peppers"
p:tracks-ref="trackList"/>
<util:list id="trackList">
<value>Sgt. Pepper's Lonely Hearts Club Band</value>
<value>With a Little Help from My Friends</value>
<value>Lucy in the Sky with Diamonds</value>
<value>Getting Better</value>
<value>Fixing a Hole</value>
<value>She's Leaving Home</value>
<value>Being for the Benefit of Mr. Kite!</value>
<value>Within You Without You</value>
<value>When I'm Sixty-Four</value>
<value>Lovely Rita</value>
<value>Good Morning Good Morning</value>
<value>Sgt. Pepper's Lonely Hearts Club Band (Reprise)</value>
<value>A Day in the Life</value>
</util:list>
<bean id="cdPlayer"
class="com.husky.spring.properties.CDPlayer"
p:compactDisc-ref="compactDisc"/>
</beans>
混合注入 1.在xml中匯入javaconfig
@Configuration
public class CDPlayerConfig {
@Bean
public CDPlayer cdPlayer(CompactDisc compactDisc){
return new CDPlayer(compactDisc);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:c="http://www.springframework.org/schema/c"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean class="com.husky.spring.CDConfig"/>
<bean id="cdPlayer"
class="com.husky.spring.CDPlayer"
c:cd-ref="compactDisc"/>
</beans>
也就是在xml中直接將這個javaconfig直接註冊成bean 2.在java中注入xmlconfig xmlconfig
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:c="http://www.springframework.org/schema/c"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="compactDisc"
class="com.husky.spring.BlankDisc"
c:_0="Sgt. perpper's Lonely Hearts Club band"
c:_1="The beatles">
</bean>
</beans>
package com.husky.spring;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author husky
* @date 2018/10/22 15:25
*/
@Configuration
public class CDConfig {
@Bean
public CompactDisc compactDisc(){
return new SgtPeppers();
}
}
@Configuration
@Import(CDPlayerConfig.class)
@ImportResource(locations = {"classpath:cd-config.xml"})
public class SoundSystemConfig {
}
通過import來匯入進來