1、註解配置

1.1、 applicationContext.xml

配置檔案

<?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
              https://www.springframework.org/schema/context/spring-context.xsd">
​
  <!--   掃描包    -->
  <context:component-scan base-package="com.chris"/>
  <!--   開啟註解配置 -->
 
  <context:annotation-config/>
​
​
</beans>

1.2 、@Component

注入bean,XML中可以不用再繼續配置bean

package com.chris.pojo;
​
import org.springframework.stereotype.Component;
​
@Component
public class UserPOJO {
  public String Name = "UserPOJO";
}

1.3 、衍生註解

@Repository（Dao層）、 @Service（Service層）、 @Controller（層）

package com.chris.dao;
​
import org.springframework.stereotype.Repository;
​
@Repository
public class UserDao {
  public String Name = "UserDao";
}

package com.chris.Services;
​
import org.springframework.stereotype.Service;
​
@Service
public class UserServices {
  public String Name = "UserServices";
}

package com.chris.Controller;
​
import org.springframework.stereotype.Controller;
​
@Controller
public class UserController {
  public String Name = "UserController";
}

呼叫方式

import com.chris.dao.UserDao;
import com.chris.pojo.UserPOJO;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
​
public class MyTest {
  public static void main(String[] args) {
    ApplicationContext context = new ClassPathXmlApplicationContext("applictionContext.xml");
    UserPOJO userPOJO = (UserPOJO) context.getBean("userPOJO");
    System.out.println(userPOJO.Name);
​
   }
}