spring06

主要是学会spring中关于通过注释来配置bean。

以及处理怎样智选其一或者补选某一个bean还有就是关于当出现多个相同的bean的时候怎样配置；

具体的代码和配置文件如下：

<?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.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    <!-- 指定spring ioc容器扫描的包 -->
    <!-- 通过resource-pattern来指定扫描的资源 -->
  <!-- <context:component-scan base-package="test1"
    resource-pattern="test1.user/*.class">
    </context:component-scan>-->
     <context:component-scan base-package="test1" use-default-filters="true">
   <!--   <context:exclude-filter type="annotation" expression="baoing"/>指定排除那些那些指定的表达式的组件-->
  <!-- <context:include-filter type="annotation" expression="baoming "只包含指定的组件，需要将相应use-default-filters="false"的贼之改成false-->
  <!--    <context:exclude-filter type="assignable" expression="jikoubaomingjialeiming "/>-->
    </context:component-scan>

</beans>

然后就是相应的g各个bean文件以及上边相应的注释。；

注意一定要放到相应的子包下下面。

package test1;

import org.springframework.stereotype.Component;

@Component
public class TestObject {

}

package test1.user;

public interface UserRepository {
    void save();
}

package test1.user;

import org.springframework.stereotype.Repository;

@Repository("userRepository")
public class UserReposityImpl implements UserRepository {

    @Override
    public void save() {
        // TODO Auto-generated method stub
        System.out.println("UserRepository save....");

    }
}

package test1;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import test1.cont.UserController;
import test1.ser.UserService;
import test1.user.UserRepository;

public class Spring {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ApplicationContext ct=new ClassPathXmlApplicationContext("beans-053.xml");
        TestObject to=(TestObject) ct.getBean("testObject");
        UserController userController=(UserController) ct.getBean("userController");
        UserRepository userRepository=(UserRepository) ct.getBean("userRepository");
        UserService userService=(UserService) ct.getBean("userService");
        System.out.println(to);
        System.out.println(userController);
        System.out.println(userService);
        System.out.println(userRepository);
    }

}

package test1.cont;

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

import test1.ser.UserService;

@Controller
public class UserController {
    @Autowired
    private UserService userService;
public void execute()
{
    System.out.println("UserController execute..");
    userService.add();
}
}

package test1.ser;

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

import test1.user.UserRepository;
//@Autowired(required=false)设置没有spring装备的bean
//@Qualifier("zhidingde bean")设置指定的bean
@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
    public void add()
    {
        System.out.println("UserSerivce add..");
        userRepository.save();
    }

}

实验结果如下：