spring-07-appconfig

package com.xu.config;

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

@Configuration//这个也会被Spring容器托管，注入到容器中，@Configuration代表beans.xml
public class XuConfig {
    @Bean//注册一个bean，就相当于一个bean标签
    public User getUser(){
        return new User();
    }
}

package com.xu.pojo;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
//这个注解的意思是这个类被Spring接管了，注册到了容器中
@Component
public class User {
    private String name;
    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                '}';
    }
    public String getName() {
        return name;
    }
    @Value("你好呀呀")//属性注入值
    public void setName(String name) {
        this.name = name;
    }
}

import com.xu.config.XuConfig;
import com.xu.pojo.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(XuConfig.class);
        User getUser = (User) context.getBean("getUser");
        System.out.println(getUser.getName());
    }
}