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