使用AnnotationConfigApplicationContext装备Bean到IoC容器

package com.springboot.chapter3.pojo;

public class User {
    private Long id;

    private String userName;

    private String note;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getNote() {
        return note;
    }

    public void setNote(String note) {
        this.note = note;
    }
}

package com.springboot.chapter3.config;

import com.springboot.chapter3.pojo.User;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/*@Configuration代表这是一个Java配置文件,Spring的容器会根据它来生成IoC容器去装配Bean*/
@Configuration
public class AppConfig {
    /*@Bean代表将initUser方法返回的POJP装配到IoC容器中，其属性name定义了这个Bean的名称，
    如果没有配置它，则将方法名称“initUser”作为Bean的名称保存到Spring IoC容器中*/
    @Bean(name = "user")
    public User initUser() {
        User user = new User();
        user.setId(1L);
        user.setUserName("user_name_1");
        user.setNote("note_1");
        return user;
    }
}

package com.springboot.chapter3.config;

import com.springboot.chapter3.pojo.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.util.logging.Logger;

public class IoCTest {
    private static Logger log = Logger.getLogger(String.valueOf(IoCTest.class));

    public static void main(String[] args) {
        ApplicationContext ctx = new AnnotationConfigApplicationContext(AppConfig.class);
        User user = ctx.getBean(User.class);
        log.info(user.getUserName());
    }
}