Java笔记-AnnotationConfigApplicationContext在Spring中的例子

古城微笑少年丶 2022-12-01 12:23 56阅读 0赞

Bean在Spring中是可以代替xml文件的。Bean在@Configuration中被创建。 应用程序的配置通过AnnotationConfigApplication加载的。AnnotationConfigApplication可以使用register去注册一个类，AnnotationConfigApplication可以使用getBean去获取Object。

下面是相关源码

AppConfig.java

package cn.it1995.demo;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    public class AppConfig {
    
        @Bean(name = "entitlement")
        public Entitlement entitlement(){
    
            Entitlement ent = new Entitlement();
            ent.setName("Entitlement");
            ent.setTime(20);
    
            return ent;
        }
    }

DemoApplication.java

package cn.it1995.demo;
    
    
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    
    public class DemoApplication {
    
        public static void main(String[] args) {
    
            AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(AppConfig.class);
    
            Entitlement ent = (Entitlement)ctx.getBean("entitlement");
    
            System.out.println(ent.getName());
            System.out.println(ent.getTime());
    
            System.out.println("-----------------------------------------------------------");
    
            AppConfig appConfig = ctx.getBean(AppConfig.class);
            Entitlement entitlement = appConfig.entitlement();
            System.out.println(entitlement.getName());
            System.out.println(entitlement.getTime());
    
        }
    }

Entitlement.java

package cn.it1995.demo;
    
    public class Entitlement {
    
        private String name;
        private int time;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public int getTime() {
            return time;
        }
    
        public void setTime(int time) {
            this.time = time;
        }
    }

程序运行截图如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxNzg0NDI3NjE_size_16_color_FFFFFF_t_70][]

源码打包下载地址：

[https://github.com/fengfanchen/Java/tree/master/AnnotationConfigApplicationContext][https_github.com_fengfanchen_Java_tree_master_AnnotationConfigApplicationContext]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxNzg0NDI3NjE_size_16_color_FFFFFF_t_70]: /images/20221123/b72a1ac57b4549c7aff5d90fd1f02a4a.png
[https_github.com_fengfanchen_Java_tree_master_AnnotationConfigApplicationContext]: https://github.com/fengfanchen/Java/tree/master/AnnotationConfigApplicationContext