实体类
package com.zmy.pojo;
import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; // @Component? 这个类被Spring给接管了,注册到了容器中 @Component public class User { ??? private String name;
??? public String getName() { ??????? return name; ??? }
??? @Value("zmyz")//属性注入(赋值) ??? public void setName(String name) { ??????? this.name = name; ??? }
??? @Override ??? public String toString() { ??????? return "User{" + ??????????????? "name='" + name + '\'' + ??????????????? '}'; ??? } }
配置类:
package config;
import com.zmy.pojo.User; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Import;
//这个也会被Spring容器托管,注册到容器中,因为他本来就是一个? @Component @Configuration @ComponentScan("com.zmy.pojo") @Import(ZmyConfig2.class)//将另一个配置类融合进来 //@Configuration? 代表这是一个配置类,和之前的beans.xml一样
public class ZmyConfig { ??? //注册一个bean,就相当于之前写的一个bean标签 ??? //这个方法的名字,就相当于bean标签中的id属性 ??? //放回置就相当于bean标签中的class属性 ??? @Bean ??? public User getUser(){ ??????? return new User();//就是返回要注入到bean的对象 ??? }
} 测试类:
import com.zmy.pojo.User; import config.ZmyConfig; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class MyTest { ??? public static void main(String[] args) { ??????? //如果完全使用了配置类方法去做,我们就只能通过Annotation上下文获取容器,通过配置类的class对象加载 ????? ApplicationContext context = new AnnotationConfigApplicationContext(ZmyConfig.class); ????? User getUseruser =(User) context.getBean("getUser"); ??????? System.out.println(getUseruser.getName()); ??? } }
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