Spring Learning to create a project Hello Spring instance code

The main research in this article is the Hello Spring instance code for creating a project in spring learning, as follows.

1. Create an eclipse project and introduce a jar package

1. eclipse creates java project HelloSpring

2. Create a lib directory and add 5 jar packages required for spring

3. Select 5 files, right-click -> Build Path -> add to build path

2. Write the hello spring code for spring

1. Create the package io.spring.beans and write HelloWorld.java

 package io.spring.beans;/** * @author ALEX E-mail:[email protected] * @version 1.0 */public class HelloWorld {private String name;public void setName(String name) {this.name = name;}public void hello() {System.out.println("hello " + name);}}

2. Right-click src-> Create spring bean configuration file applicationContext.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"> <!-- Configure bean --> <bean id="helloWorld"> <property name="name" value="Big Red"></property> </bean> </beans>

3. Write Main.java

 package io.spring.beans;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * @author PangpangのALEX E-mail:[email protected] * @version 1.0 */public class Main {public static void main(String[] args) {//1. Create Spring IOC container object ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");//2. Get Bean instance from the IOC container HelloWorld helloWorld = (HelloWorld) ctx.getBean("helloWorld");//3. Call the hello method helloWorld.hello();}}

Output result

When a red spring log is printed in the console, it means that the spring application is successful

Summarize

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