spring简单的三层架构及其保姆级别spring下载

1.控制层

package com.sunyu.spring.Controller;

import com.sunyu.spring.Severce.UserSeverce;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
/**
 * 控制层注解Controller
 * 提供私有属性自动装配注解Autowired
 */
@Controller
public class UserController {
    @Autowired

    private UserSeverce userSeverce;

    public UserSeverce getUserSeverce() {
        return userSeverce;
    }

    public void setUserSeverce(UserSeverce userSeverce) {
        this.userSeverce = userSeverce;
    }
    public void text(){
        userSeverce.sayHello();
    }
}

2.业务层

（1）业务层接口

package com.sunyu.spring.DAO;

public interface UserDAO {
    void sayHello();
}

（2）接口实现类

package com.sunyu.spring.Severce;

import com.sunyu.spring.DAO.UserDAO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 业务层注解Service
 */
@Service
public class UserSeverceiMPL implements UserSeverce{
    @Autowired

    private UserDAO userDAO;

    public UserDAO getUserDAO() {
        return userDAO;
    }

    public void setUserDAO(UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    @Override
    public void sayHello() {
        userDAO.sayHello();
    }
}

3.持久层

（1）DAO接口

package com.sunyu.spring.DAO;

public interface UserDAO {
    void sayHello();
}

（2）DAO实现类

package com.sunyu.spring.UserDAOImpl;

import com.sunyu.spring.DAO.UserDAO;
import org.springframework.stereotype.Repository;
/**
 * 持久层注解Repository
 */
@Repository
public class UserDAOImpl implements UserDAO {
    @Override
    public void sayHello() {
        System.out.println("您的spring配置成功");
    }
}

4.Resources下applicationContext.xml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:util="http://www.springframework.org/schema/util"
       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/util https://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <!--       设置要扫描的包-->
    <context:component-scan base-package="com.sunyu.spring">
    </context:component-scan>
</beans>

附图：

5.pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>spring-ioc-zhujie</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

<!-- 基于Maven依赖传递性，导入spring-context依赖即可导入当前所需所有jar包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.3.1</version>
    </dependency>

<!-- junit测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>

    <!-- MySQL驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.16</version>
    </dependency>

    <!-- 数据源 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.0</version>
    </dependency>

</dependencies>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
</project>

这里不需要的可以不配置

附：

spring下载：

链接：https://spring.io/

1.

 2.

3. 

我这里下载这个 ：

4.使用：https://steampp.net/

访问github 

5. 向下滑找到这里

6. 下拉找到这里

7.

 8.按照libs-release/org/springframework/spring/这个文件顺序找到spring文件夹，之后找到自己想要的版本，右键下载（download）