Spring入门——（十、Bean管理的注解实现:Required、Autowired）

>@Required

>@Autowired

示例：

spring-injection.xml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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd" >
        
<!--         <bean id="injectionService" class="com.imooc.ioc.injection.service.InjectionServiceImpl"> -->
<!--         	<property name="injectionDAO" ref="injectionDAO"></property> -->
<!--         </bean> -->

		<bean id="injectionService" class="com.imooc.ioc.injection.service.InjectionServiceImpl">
        	<constructor-arg name="injectionDAO" ref="injectionDAO"></constructor-arg>
        </bean>
        
        <bean id="injectionDAO" class="com.imooc.ioc.injection.dao.InjectionDAOImpl"></bean>
	
 </beans>

InjectionDAO层：

package com.imooc.beanannotation.injection.dao;

public interface InjectionDAO {
	
	public void save(String arg);
	
}

InjectionDAOImpl实现：

package com.imooc.beanannotation.injection.dao;

import org.springframework.stereotype.Repository;

@Repository
public class InjectionDAOImpl implements InjectionDAO {
	
	public void save(String arg) {
		//模拟数据库保存操作
		System.out.println("保存数据：" + arg);
	}

}

InjectionService层：

package com.imooc.beanannotation.injection.service;

public interface InjectionService {
	
	public void save(String arg);
	
}

InjectionServiceImpl实现:

package com.imooc.beanannotation.injection.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.imooc.beanannotation.injection.dao.InjectionDAO;

@Service
public class InjectionServiceImpl implements InjectionService {
	
//	@Autowired
	private InjectionDAO injectionDAO;
	
	@Autowired
	public InjectionServiceImpl(InjectionDAO injectionDAO) {
		this.injectionDAO = injectionDAO;
	}
	
//	@Autowired
	public void setInjectionDAO(InjectionDAO injectionDAO) {
		this.injectionDAO = injectionDAO;
	}



	public void save(String arg) {
		//模拟业务操作
		System.out.println("Service接收参数：" + arg);
		arg = arg + ":" + this.hashCode();
		injectionDAO.save(arg);
	}
	
}

测试类:

package com.imooc.test.beanannotation;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;

import com.imooc.beanannotation.injection.service.InjectionService;
import com.imooc.beanannotation.multibean.BeanInvoker;
import com.imooc.test.base.UnitTestBase;

@RunWith(BlockJUnit4ClassRunner.class)
public class TestInjection extends UnitTestBase {
	
	public TestInjection() {
		super("classpath:spring-beanannotation.xml");
	}
	
	@Test
	public void testAutowired() {
		InjectionService service = super.getBean("injectionServiceImpl");
		service.save("This is autowired.");
	}
	
	@Test
	public void testMultiBean() {
		BeanInvoker invoker = super.getBean("beanInvoker");
		invoker.say();
	}
	
}

测试结果：

七月 10, 2018 11:06:07 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5d22bbb7: startup date [Tue Jul 10 23:06:07 GMT+08:00 2018]; root of context hierarchy
七月 10, 2018 11:06:07 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring-beanannotation.xml]
七月 10, 2018 11:06:08 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [config.xml]
七月 10, 2018 11:06:08 下午 org.springframework.core.io.support.PropertiesLoaderSupport loadProperties
信息: Loading properties file from class path resource [config.properties]
七月 10, 2018 11:06:08 下午 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
信息: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
JsrServie init.
Service接收参数：This is autowired.
保存数据：This is autowired.:581318631
七月 10, 2018 11:06:08 下午 org.springframework.context.support.AbstractApplicationContext doClose
信息: Closing org.springframework.context.support.ClassPathXmlApplicationContext@5d22bbb7: startup date [Tue Jul 10 23:06:07 GMT+08:00 2018]; root of context hierarchy
JsrServie destroy.
七月 10, 2018 11:06:08 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@769f71a9: startup date [Tue Jul 10 23:06:08 GMT+08:00 2018]; root of context hierarchy
七月 10, 2018 11:06:08 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring-beanannotation.xml]
七月 10, 2018 11:06:08 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [config.xml]
七月 10, 2018 11:06:08 下午 org.springframework.core.io.support.PropertiesLoaderSupport loadProperties
信息: Loading properties file from class path resource [config.properties]
七月 10, 2018 11:06:08 下午 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
信息: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
JsrServie init.
list...
com.imooc.beanannotation.multibean.BeanImplTwo
com.imooc.beanannotation.multibean.BeanImplOne

map...
beanImplOne      com.imooc.beanannotation.multibean.BeanImplOne
beanImplTwo      com.imooc.beanannotation.multibean.BeanImplTwo

com.imooc.beanannotation.multibean.BeanImplTwo
七月 10, 2018 11:06:08 下午 org.springframework.context.support.AbstractApplicationContext doClose
信息: Closing org.springframework.context.support.ClassPathXmlApplicationContext@769f71a9: startup date [Tue Jul 10 23:06:08 GMT+08:00 2018]; root of context hierarchy
JsrServie destroy.