Spring中如何使用@Import和@Bean注册bean呢?

下文笔者讲述使用@import和@Bean注解注册bean的方法分享

以前我们都知道使用一个@Configuration注解
和@Bean注解就可以将一个类交给Spring容器管理

那么还有一个方法使用@Import和@Bean注解也可以将一个Bean对象交给Spring容器管理

只需在Spring启动类上加入@Import(类全路径)
使用这种方式即可将一个Bean交给Spring容器管理

例:@Import和@Bean将一个Bean交给Spring容器管理

 
package com.java265.annotation;
 
import com.java265.config.MyBeanConfiguration;
import org.springframework.context.annotation.Import;
 
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
 
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.Runtime)
@Import({MyBeanConfiguration.class})
public @interface EnableMyBean {
}
 

package com.java265.config;
 
import com.java265.entity.MyBean;
import org.springframework.context.annotation.Bean;
 
public class MyBeanConfiguration {
    @Bean
    public MyBean myBean() {
        return new MyBean();
    }
}




//启动类上加自定义的注解。

package com.java265;
 
import com.java265.annotation.EnableMyBean;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;
 
@SpringBootApplication
@EnableMyBean
public class DemoApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
 
}

//方法2：@Configuration 标记的类

package com.java265.config;
 
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.stereotype.Component;
 
@Configuration
@Import({MyBeanConfiguration.class})
public class MyBeanImportConfiguration {
 
}


//测试
package com.java265.controller;
 
import com.java265.entity.MyBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class HelloController {
    @Autowired
    private MyBean myBean;
 
    @GetMapping("/test")
    public String test() {
        return myBean.sayHello();
    }
}