企发---作业1 Spring框架的IOC和DI

1.正确的安装idea开发环境

2.在idea中配置maven

3.新建项目,添加对spring框架的依赖

配置pom.xml导入依赖

<packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>
    </dependencies>

4.完成课本中的实例1-1全部内容,观察控制台输出

1.创建实体类

package top.chenyp.pojo;

import java.io.Serializable;

public class User implements Serializable {
    
    

   private String id;

   private String username;

   private String password;

   public String getId() {
    
    
       return id;
   }

   public void setId(String id) {
    
    
       this.id = id;
   }

   public String getUsername() {
    
    
       return username;
   }

   public void setUsername(String username) {
    
    
       this.username = username;
   }

   public String getPassword() {
    
    
       return password;
   }

   public void setPassword(String password) {
    
    
       this.password = password;
   }

   @Override
   public String toString() {
    
    
       return "User{" +
               "id='" + id + '\'' +
               ", username='" + username + '\'' +
               ", password='" + password + '\'' +
               '}';
   }
}

2.配置mapper
接口

public interface UserMapper {
    
    
    List<User> findUsers();
}

实现类

public class UserMapperImpl implements UserMapper {
    
    
    public List<User> findUsers() {
    
    
        List<User> lists=new ArrayList<User>();
        User user1=new User("1","admin","admin");
        User user2=new User("2","root","1234");
        lists.add(user1);
        lists.add(user2);
        return lists;
    }
}

3.配置service
接口

public interface UserService {
    
    
    List<User> findUsers();
}

实现类

public class UserServiceImpl implements UserService {
    
    
    public List<User> findUsers() {
    
    
        ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = (UserMapper) ac.getBean("userMapper");
        return userMapper.findUsers();
    }
}

4.配置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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="userMapper" class="top.chenyp.mapper.impl.UserMapperImpl"/>
    <bean id="userService" class="top.chenyp.service.impl.UserServiceImpl"/>


</beans>

5.测试类

public static void main(String[] args) {
    
    
        //测试
        ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = (UserService) ac.getBean("userService");
        List<User> users = userService.findUsers();
        for(User user :users){
    
    
            System.out.println(user);
        }
    }

6.测试结果