Spring boot Bean装配

. Spring boot bean 默认创建的bean 为singleton模式

. @Component 注解

. @Value 为属性初始化

. @Value("${}") 可以使用yml里面的配置信息

package com.example.banedemo.bean;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
//@Scope("prototype")
//@Scope("singleton")  // sping 默认创建的bean是singleton
public class User {

    @Value("${com.example.banedemo.User.name}")
    private String name;

    @Value("123456")
    private String pwd;

    @Value("27")
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

yml

com:
  example:
    banedemo:
      User:
        name: gali

主入口

@SpringBootApplication
public class BanedemoApplication {

    public static Logger logger= LoggerFactory.getLogger(BanedemoApplication.class);
    public static void main(String[] args) {
        ConfigurableApplicationContext ac= SpringApplication.run(BanedemoApplication.class, args);
        User c=ac.getBean(Custom.class).getUser();
        String s=c.getName();
        logger.info(s);

    }

}