Spring1

Spring1

Spring 是⼀个企业级开发框架，是软件设计层⾯的框架，优势在于可以将应⽤程序进⾏分层，开发者可 以⾃主选择组件。

MVC：Struts2、Spring MVC

ORMapping：Hibernate、MyBatis、Spring Data

目录

• Spring1
  • Spring 框架两⼤核⼼机制（IoC、AOP）
  • 如何使⽤ IoC

Spring 框架两⼤核⼼机制（IoC、AOP）

IoC（控制反转）/ DI（依赖注⼊）

AOP（⾯向切⾯编程）

如何使⽤ IoC

1.创建 Maven ⼯程，pom.xml 添加依赖

<?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>com.southwind</groupId>
    <artifactId>aispringioc</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.11.RELEASE</version>
        </dependency>
    </dependencies>
</project>

2.创建实体类 Student

import lombok.Data;
@Data
public class Student {
private long id;
private String name;
private int age;
}

3.传统的开发⽅式，⼿动 new Student

Student student = new Student();
student.setId(1L);
student.setName("张三");
student.setAge(22);
System.out.println(student);

4.通过 IoC 创建对象，在配置⽂件中添加需要管理的对象，XML 格式的配置⽂件，⽂件名可以⾃定 义。

<?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"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
 http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.3.xsd
">
    <bean id="student" class="com.southwind.entity.Student">
        <property name="id" value="1"></property>
        <property name="name" value="张三"></property>
        <property name="age" value="22"></property>
    </bean>
</beans>

5.从 IoC 中获取对象，通过 id 获取。

//加载配置⽂件
ApplicationContext applicationContext = new
ClassPathXmlApplicationContext("spring.xml");
Student student = (Student) applicationContext.getBean("student");
System.out.println(student);