一、新建Spring-Maven项目

• 在pom.xml文件中添加插件管理依赖

    <build><plugins><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.1</version><configuration><source>1.8</source><target>1.8</target></configuration></plugin></plugins></build>
  

• 在pom.xml文件中添加Spring-Context依赖
  • 其他版本地址
    • https://mvnrepository.com/artifact/org.springframework/spring-context

        <dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.5.RELEASE</version></dependency>
  

二、在Spring-context使用IOC和依赖注入

• 在resource里面新建一个spring的xml文件

  • applicationContext.xml ，如图
    

  • 新建接口类

        package org.study;public interface ISomeService {void doSome();}

  • 新建接口实现类

        package org.study;public class SomeService implements  ISomeService{/*** 构造函数*/public SomeService(){System.out.println("SomeService 构造函数！");}/****/@Overridepublic void doSome() {System.out.println("doSome 函数！");}} 
    

  • Main函数中执行

        package org.example;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.study.ISomeService; public class Main {public static void main(String[] args) {//加载配置文件ApplicationContext context =   new ClassPathXmlApplicationContext("applicationContext.xml");//第一种方式ISomeService iSomeService = (ISomeService)context.getBean("SomeService");iSomeService.doSome();//第二种方式 要求：获取对应的实例，该实例必须实现对应的接口ISomeService iSomeService1 =  context.getBean("SomeService",ISomeService.class);iSomeService.doSome(); }}
    

  • 在当前的服务中调用其他服务

    • 第一种方式
      • 使用setter的方式
        • 接口类

                package org.study;public interface ISomeService1 {void doSome();} 
          

        • 实现类

                package org.study;public class SomeService1 implements  ISomeService1{private ISomeService iSomeService;public void setiSomeService(ISomeService iSomeService) {this.iSomeService = iSomeService;} /*** 构造函数*/public SomeService1(){System.out.println("SomeService1 构造函数！");} /****/@Overridepublic void doSome() {iSomeService.doSome();}} 
          

        • 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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"><bean  id ="SomeService" class="org.study.SomeService"></bean><bean id="SomeService1" class="org.study.SomeService1" ><!--使用 setter--><property  name="iSomeService" ref="SomeService"></property>  </bean></beans><!--name : 提供setter方法的属性名称ref:容器中已经有的bean名称-->
          

    • 第二种方式
      • 使用构造函数方式
        • 接口类

                package org.study;public interface ISomeService1 {void doSome();} 
          

        • 实现类

                package org.study;public class SomeService1 implements  ISomeService1{private ISomeService iSomeService;public  SomeService1 (ISomeService iSomeService){this.iSomeService = iSomeService;}/*** 构造函数*/public SomeService1(){System.out.println("SomeService1 构造函数！");}/****/@Overridepublic void doSome() {iSomeService.doSome();}}

        • 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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"><bean  id ="SomeService" class="org.study.SomeService"></bean> <bean id="SomeService1" class="org.study.SomeService1" ><constructor-arg name="iSomeService" ref="SomeService"></constructor-arg></bean></beans><!--name :  属性名称ref:容器中已经有的bean名称-->
          

    • main函数执行

         ISomeService1 iSomeService1 = context.getBean("SomeService1",ISomeService1.class);iSomeService1.doSome();