package com.wisely.di;import org.springframework.stereotype.Service;@Service//写为@Component,@Controller,@Repository效果相同,视具体情况使用public class Demo1Service {    public String sayHello(String word ){        return "Hello "+word;    }}

package com.wisely.di;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Servicepublic class Demo2Service {    @Autowired //注入Demo1Service,还可使用JavaEE的@Inject(JSR-330),@Resource(JSR-250)效果相同    Demo1Service demo1Service;    public String callDemo1SayHello(String word){        return demo1Service.sayHello(word);    }}

package com.wisely.di;import org.springframework.context.annotation.AnnotationConfigApplicationContext;public class Main {    public static void main(String[] args) {        //设定此包下的类被注册成spring的bean,包含@Configuration,@Component,@Service,@Repository,@Controller        AnnotationConfigApplicationContext context =                new AnnotationConfigApplicationContext("com.wisely.di");        Demo2Service demo2Service = context.getBean(Demo2Service.class);        System.out.println(demo2Service.callDemo1SayHello("World"));        context.close();    }}