spring基础注解装配

新建maven项目

 导入依赖

<dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

UserDao.java

package com.shrimpking.annotation;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/5 11:59
 */
public interface UserDao
{
    public void save();
}

UserDaoImpl.java

package com.shrimpking.annotation;

import org.springframework.stereotype.Repository;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/5 12:00
 */
@Repository("userDao")
public class UserDaoImpl implements UserDao
{
    @Override
    public void save()
    {
        System.out.println("userDao.save");
    }
}

UserService.java

package com.shrimpking.annotation;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/5 12:02
 */
public interface UserService
{
    public void save();
}

UserServiceImpl.java

package com.shrimpking.annotation;

import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/5 12:02
 */
@Service("userService")
public class UserServiceImpl implements UserService
{
    @Resource(name = "userDao")
    private UserDao userDao;

    @Override
    public void save()
    {
        System.out.println("userService.save-->");
        this.userDao.save();
    }
}

UserController.java

package com.shrimpking.annotation;

import javax.annotation.Resource;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/5 12:07
 */
public class UserController
{
    @Resource(name = "userService")
    private UserService userService;

    public void save()
    {
        System.out.println("userController.save-->");
        this.userService.save();
    }
}

applicationContext.xml

<?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">

    <!-- 开启注解处理器   -->
    <context:annotation-config/>
    <!-- 或者开启注解扫描   -->
    <context:component-scan base-package="com.shrimpking.annotation"/>

    <bean id="userDao" class="com.shrimpking.annotation.UserDaoImpl"/>
    <bean id="userService" class="com.shrimpking.annotation.UserServiceImpl"/>
    <bean id="userController" class="com.shrimpking.annotation.UserController"/>

</beans>

AnnotationTest.java

import com.shrimpking.annotation.UserController;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/5 12:18
 */
public class AnnotationTest
{
    @Test
    public void test()
    {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserController userController = context.getBean("userController", UserController.class);
        userController.save();
    }
}