The first HelloWorld program in Spring framework

The first HelloWorld program in Spring framework

Create a maven project

Create HelloWorld class and Main class

HelloWorld class:

package Test;

public class HelloWorld {
    
    
    private String name;

    public void setName(String name) {
    
    
        this.name = name;
    }

    public void hello(){
    
    
        System.out.println("hello:"+name);
        System.out.println("Hello world!");
    }
    }

Main class:

package Test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
    
    
    public static void main(String[] args) {
    
    

//        使用Spring框架后
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("application.xml");
        HelloWorld helloWorld = (HelloWorld) applicationContext.getBean("helloWorld");
        helloWorld.hello();

//        传统写法
//        HelloWorld helloWorld = new HelloWorld();
//        helloWorld.setName("Hello world!");
    }
}

Create an xml file in the resources folder

Configure the bean in the xml file created in the previous step

<?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bean-->
    <bean id="helloWorld" class="Test.HelloWorld">
        <property name="name" value="Spring"></property>
    </bean>
</beans>

run

note

You must wait for the download of the relevant files at the bottom of IDEA to run the main method