Spring自动装配（注解）-蒲公英云

Spring自动装配（注解）

叁歲伎倆 2022-07-12 10:51 334阅读 0赞

1.在xml配置文件中，引入context命名空间

xmlns:context="http://www.springframework.org/schema/context"    
http://www.springframework.org/schema/context  
http://www.springframework.org/schema/context/spring-context-2.5.xsd

设置自动扫描指定包：

<context:component-scan base-package="包名(扫描本包及子包)"/>

2.在实体类中添加注解

package com.ffy.autowiring;
import org.springframework.stereotype.Repository;
@Repository
public class InjectionDAOImpl implements InjectionDAO{ 
    public void save(String arg) {
        System.out.println("保存数据"+arg);
    }
}
@Service
public class InjectionServiceImpl implements InjectionService{ 
    @Autowired //此注解表明该类为自动装配
    private InjectionDAO injectionDAO;
    public void save(String arg) {
        System.out.println("Service接收参数："+arg);
        arg=arg+":"+this.hashCode();
        injectionDAO.save(arg);
    }
}

3.测试

public class Main {
    public static void main(String[] args) {
        ApplicationContext c=new ClassPathXmlApplicationContext("autowiring.xml");
        InjectionService service=(InjectionService) c.getBean("injectionServiceImpl");
        service.save("ffy");
    }
}