Chapter 1 Introduction to Spring 4 and Getting Beans

Section 1: Introduction to Spring4

Spring is an open source framework. Spring is a lightweight Java development framework that emerged in 2003 and was created by Rod Johnson. In short, Spring is a layered JavaSE/EEfull-stack (one-stop) lightweight open source framework.

Spring Author: Rod Johnson;
Official website: http://spring.io/The
latest development kit and document download address: http://repo.springsource.org/libs-release-local/org/springframework/spring/Core


idea:

1 , IOC Inversion of Control;
2. AOP is aspect-oriented;


Section 2: Spring4 version of HelloWorld implementation

Attached source code

HelloWorld.java

package com.java.fx.test;

public class HelloWorld {

	public void say(){
		System.out.println("Spring4获取bean！");
	}
}

beans.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">

	<bean id="helloWorld" class="com.java.fx.test.HelloWorld"></bean>

  
</beans>

Test.java

package com.java.fx.service;

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

import com.java.fx.test.HelloWorld;

public class Test {

	public static void main(String[] args) {
		ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xml");
		HelloWorld helloWorld=(HelloWorld)ac.getBean("helloWorld");
		helloWorld.say();
	}
}