Spring学习(16)--- 基于Java类的配置Bean 之 基于泛型的自动装配(spring4新增)
出处:http://www.cnblogs.com/JsonShare
例子:
定义泛型Store
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package javabased; public interface Store<T> { } |
两个实现类StringStore,IntegerStore
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package javabased; public class IntegerStore implements Store<Integer> { } |
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package javabased; public class StringStore implements Store<String> { } |
java config实现bean配置
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package javabased; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class StoreConfig { @Autowired private Store<String> s1; @Autowired private Store<Integer> s2; @Bean public StringStore stringStore() { return new StringStore(); } @Bean public IntegerStore integerStore() { return new IntegerStore(); } @Bean (name= "test_generic" ) public String print(){ //测试 System.out.println( "s1 : " +s1.getClass().getName()); System.out.println( "s2 : " +s2.getClass().getName()); return "" ; } } |
XML配置:
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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" xmlns:context= "http://www.springframework.org/schema/context" xsi:schemaLocation="http: //www.springframework.org/schema/beans http: //www.springframework.org/schema/beans/spring-beans-4.1.xsd http: //www.springframework.org/schema/context http: //www.springframework.org/schema/context/spring-context-4.1.xsd"> <context:component-scan base- package = "javabased" > </context:component-scan> </beans> |
单元测试:
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package javabased; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class UnitTest { @Test public void test(){ ApplicationContext context = new ClassPathXmlApplicationContext( "classpath:spring-beanannotation.xml" ); context.getBean( "test_generic" ); } } |
结果:
2015-7-8 15:12:04 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@32bf7190: startup date [Wed Jul 08 15:12:04 CST 2015]; root of context hierarchy 2015-7-8 15:12:04 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [spring-beanannotation.xml] s1 : javabased.StringStore s2 : javabased.IntegerStore
也可参考(挺详细的):http://blog.csdn.net/yangxt/article/details/19970323
Spring学习(17)--- 三种装配Bean方式比较
基于XML配置 |
基于注解配置 |
基于Java类配置 |
|
Bean定义 |
<bean id="..." class="..." /> |
@Component 衍生类@Repository @Service @Controller |
@Configuration标注类,@Bean标注提供Bean方法 |
Bean名称 |
通过 id或name指定 |
@Component("person") |
@Bean("person") |
Bean注入 |
<property> 或者 通过p命名空间 |
@Autowired 按类型注入 @Qualifier按名称注入 |
在方法内部编写注入代码逻辑 |
生命过程、Bean作用范围 |
init-method destroy-method 范围 scope属性 |
@PostConstruct 初始化 @PreDestroy 销毁 @Scope设置作用范围 |
在方法内部调用初始化方法 @Scope指定范围 |
适合场景 |
Bean来自第三方,使用其它命名空间 |
Bean的实现类由用户自己开发 |
实例化Bean的逻辑比较复杂 |