【2021Spring编程实战笔记】Spring开发分享~（下）-阿里云开发者社区

【2021Spring编程实战笔记】Spring开发分享~（下）

2024-10-12 8

版权

本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。

简介： 【2021Spring编程实战笔记】Spring开发分享~（下）

【2021Spring编程实战笔记】Spring开发分享~（上）+https://developer.aliyun.com/article/1621239

04、构造注入(用的不多，只做了解)

将需要注入的对象声明为成员变量

package construct;
public class Car {
    private String brand;
    private String corp;
    private Double price;
    private int maxSpeed;
}

利用构造函数，我写了两个：

package construct;
public class Car {
    public Car(String brand, String corp, Double price) {
        this.brand = brand;
        this.corp = corp;
        this.price = price;
    }
    public Car(String brand, String corp, int maxSpeed) {
        this.brand = brand;
        this.corp = corp;
        this.maxSpeed = maxSpeed;
    }
}

工厂容器里边配置一下：

<?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="car" class="construct.Car">
        <constructor-arg value="Audi" type="java.lang.String"/>
        <constructor-arg value="luntai" type="java.lang.String"/>
        <constructor-arg value="30" type="java.lang.Double"/>
    </bean>
    <bean id="car1" class="construct.Car">
        <constructor-arg value="Audi" type="java.lang.String"/>
        <constructor-arg value="luntai" type="java.lang.String"/>
        <constructor-arg value="300" type="int"/>
    </bean>
</beans>

构造注入的测试

package construct;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class CarTest {
    public static void main(String[] args) {
        ApplicationContext Context = new ClassPathXmlApplicationContext("/init/init.xml");
        Car car = (Car) Context.getBean("car");
        System.out.println(car.toString());
    }
}

执行：

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-aBfGmG1O-1604408298814)(https://cdn.jsdelivr.net/gh/JackieLing/mage1/img/20201028105124.png)]

05、自动注入(用的也不多)

package autodi;
public class BookDAOImpl implements BookDAO {
    private BookDAO bookDAO;
    @Override
    public void save() {
        System.out.println("BookDAO invoke~~~");
    }
}

<?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="bookDAO" class="autodi.BookDAOImpl"/>
    <!--
        autowrite的作用：用来指定当前组件中依赖的组件的注入方式是什么
        注意：类中成员变量与工厂中bean的id一致则自动赋值，否则不注入
        byname:根据类中的成员变量名进行注入
        bytype:根据类中的成员变量类型进行注入
    -->
    <!--<bean id="bookService" class="autodi.BookServiceImpl" autowire="byName"/>-->
    <!--
        类中成员变量的类型与工厂中bean的类型一致则强行注入，否则不注入。
    -->
    <bean id="bookService" class="autodi.BookServiceImpl" autowire="byType"/>
</beans>

06、spring工厂的细节

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-583X3hlZ-1604408298815)(https://cdn.jsdelivr.net/gh/JackieLing/mage1/img/20201028204142.png)]

07、AOP面向切面编程

7.1、静态代理(proxy)

给一幅图做一个简单介绍：

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-XhNOlhdV-1604408298821)(https://img.rruu.net/image/5f9a7bea0f104)]

7.2、动态代理

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-TnV8QcCC-1604408298824)(https://img.rruu.net/image/5f9aa84aab174)]

7.3、面向切面编程AOP原理概念

7.4、AOP编程的编程步骤

7.4.1引入AOP编程相关的依赖

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.20.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.20.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.20.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>4.3.20.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.20.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>4.3.20.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>4.3.20.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>4.3.20.RELEASE</version>
    </dependency>
  </dependencies>