观看慕课moocer老师视频Spring Bean装配之Autowire注解说明-1

@Autowired（放在成员变量上）

package com.imooc.test.beanannotation;import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;import com.imooc.ioc.injection.service.InjectionService;
import com.imooc.ioc.interfaces.UnitTestBase;@RunWith(BlockJUnit4ClassRunner.class)
public class TestBeanAnnotation extends UnitTestBase{public TestBeanAnnotation(){super("classpath*:spring-beanannotation.xml");}@Testpublic void testAutowired(){InjectionService service=super.getBean("injectionServiceImpl");service.save("This is autowired.");}
}

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><context:component-scan base-package= "com.imooc.beanannotation"></context:component-scan></beans>

package com.imooc.beanannotation.injection.dao;import org.springframework.stereotype.Repository;import com.imooc.ioc.injection.dao.InjectionDAO;@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);}}

package com.imooc.beanannotation.injection.service;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.imooc.ioc.injection.dao.InjectionDAO;
import com.imooc.ioc.injection.service.InjectionService;@Service
public class InjectionServiceImpl implements InjectionService{@Autowiredprivate 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);}}

运行结果：

为DAO生成set方法：

package com.imooc.beanannotation.injection.service;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.imooc.ioc.injection.dao.InjectionDAO;
import com.imooc.ioc.injection.service.InjectionService;@Service
public class InjectionServiceImpl implements InjectionService{//@Autowiredprivate InjectionDAO injectionDAO;@Autowiredpublic 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);}}

运行结果：

构造器方式：

package com.imooc.beanannotation.injection.service;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.imooc.ioc.injection.dao.InjectionDAO;
import com.imooc.ioc.injection.service.InjectionService;@Service
public class InjectionServiceImpl implements InjectionService{//@Autowiredprivate InjectionDAO injectionDAO;@Autowiredpublic InjectionServiceImpl (InjectionDAO injectionDAO){this.injectionDAO = injectionDAO;}//@Autowiredpublic 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);}}

运行结果：

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