Spring入门

version5.2.7 Download Link

ioc：Inversion of Control 控制反转自动创建对象，例如Tomcat容器自动创建servlet等对象。

di：dependency injection 依赖注入提供对象名称即可实现该对象，利用反射机制。

maven配置了好久，这玩意一直报错，还慢死了，真的难用，淦！

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.7.RELEASE</version>
    </dependency>

 

//service01.java

package com.faded828x.service;

public class service01 {

    public service01() {
    }

    public void twoSum(int a, int b){
        System.out.println(a+b);
    }
}

//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="sum1" class="com.faded828x.service.service01"/>
</beans>

//testSum.java

package com.faded828x;

import com.faded828x.service.service01;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class testSum {
    @Test
    public void testSum1(){
        service01 service01 = new service01();
        service01.twoSum(1, 2);
    }

    @Test
    public void testSum2(){
        String config = "beans.xml";
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(config);
        service01 sum1 = (service01) applicationContext.getBean("sum1");
        sum1.twoSum(2,3);
    }
}