1. Spring concept

1. Spring concept

(1) Spring isLightweightofOpen source JavaEE frame。

(2) Spring can solve the complexity of enterprise application development.

(3) Spring has two core parts: IOC and Aop.

• IOC: Inversion of control, the process of creating objects is handed over to Spring for management
• Aop: aspect-oriented, without modifying the source code for functional enhancement

(4) Spring features

• Facilitate decoupling and simplify development
• Aop programming support
• Convenient for program testing
• Easy to integrate with other frameworks
• Facilitate transaction operations
• Reduce the difficulty of API development

(5) Now in the course, select Spring version 5.x

2. Introductory case

2.1 Download Spring5

Official website address: Spring official website address https://spring.io/






Download address: Spring download address


Unzip and get the following directory:

2.2 Open the IDEA tool and create a normal Java project

2.3 Import Spring5 related jar packages

Create a lib file and put the basic jar package into

2.4 Create a common class, create a common method in this class

2.5 Create a Spring configuration file and configure the created objects in the configuration file

Spring configuration file uses xml format

bean1.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">

    <!-- 配置User对象创建 -->
    <bean id="user" class="com.mycode.spring5.User"></bean>
</beans>

2.6 Write test code

public class TestSpring5 {
    
    

    @Test
    public void testAdd() {
    
    
        // 1、加载 Spring 配置文件
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");

        // 2、获取配置创建的对象
        User user = context.getBean("user", User.class);
        
        System.out.println(user);
        user.add();
    }
}