Spring 4.2新特性-@Import注解的升级

3.1 @Import

• @Import注解在4.2之前只支持导入配置类
• 在4.2,@Import注解支持导入普通的java类,并将其声明成一个bean

3.2 示例

• 演示java类

package com.wisely.spring4_2.imp;

public class DemoService {
    public void doSomething(){
        System.out.println("everything is all fine");
    }

}

• 演示配置

package com.wisely.spring4_2.imp;

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
@Configuration
@Import(DemoService.class)//在spring 4.2之前是不不支持的
public class DemoConfig {

}

• 运行

package com.wisely.spring4_2.imp;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext("com.wisely.spring4_2.imp");
        DemoService ds = context.getBean(DemoService.class);
        ds.doSomething();

    }

}

输出结果

everything is all fine