Spring基于的注解自动装配和依赖注入(***)

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#自动装配的小Demo:

package
com.gyf.annotation; public interface UserDao { public void save(); }
package com.gyf.annotation; import org.springframework.stereotype.Repository; @Repository("userDao") public class UserDaoImpl implements UserDao { @Override public void save() { System.out.println("UserDao接口的实现类的save方法的实现..."); } }

package com.gyf.annotation; public interface UserService { void save(); } package com.gyf.annotation; import org.springframework.stereotype.Service; import javax.annotation.Resource; @Service("userService") public class UserServiceImpl implements UserService { @Resource(name = "userDao") private UserDao userDao; @Override public void save() { this.userDao.save(); System.out.println("userservice...save..."); } }

 

 

#配置文件

<?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.xsd"
> <context:component-scan base-package="com.gyf.annotation"/> </beans>


package com.gyf.test;

import com.gyf.annotation.UserController;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class test {
    public static void main(String[] args) {
        String xmlPath="beans6.xml";
        ApplicationContext ac=new ClassPathXmlApplicationContext(xmlPath);
        UserController userController=(UserController)ac.getBean("userController");
        userController.save();
    }
}

运行结果:userController save...

 

----------------------------------------------------------------------------------------------------------------------------------------------

 

 

#依赖注入

package
com.gyf.ioc; public interface UserDao { void say(); } package com.gyf.ioc; public class UserDaoImpl implements UserDao { @Override public void say() { System.out.println("userDao say hello world"); } } package com.gyf.ioc; public interface UserService { void say(); } package com.gyf.ioc; public class UserServiceImpl implements UserService { private UserDao userDao; public void setUserDao(UserDao userDao) { this.userDao = userDao; } @Override public void say() { this.userDao.say(); System.out.println("userService say hello world"); } }

 

#配置文件

<?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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

      <bean id="userDao" class="com.gyf.ioc.UserDaoImpl"/>

       <bean id="userService" class="com.gyf.ioc.UserServiceImpl">
             <property name="userDao" ref="userDao"/>
       </bean>
    
</beans>

#测试:
package com.gyf.test;

import com.gyf.ioc.UserDao;
import com.gyf.ioc.UserService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class test {
    @Test
    public void test1(){
        ApplicationContext ac=new ClassPathXmlApplicationContext("beansIOC.xml");

        UserDao userDao=(UserDao)ac.getBean("userDao");
        userDao.say();
        UserService userService=(UserService)ac.getBean("userService");
        userService.say();
    }
}

 学会重复!

多练习,Spring 基础很重要!

 











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