利用注解配置Spring容器的方法

@Configuration
public class SpringConfiguration {
 public SpringConfiguration() {
  System.out.println("初始化Spring容器");
 }
}

public class Main {
 public static void main(String[] args) {
  ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfiguration.class);

 }
}

public class User {
 private String username;
 private int age;

 public User(String username, int age) {
  this.username = username;
  this.age = age;
 }

 public void init(){
  System.out.println("初始化User...");
 }

 public void say() {
  System.out.println(String.format("Hello,my name is %s,I am %d years old ", username, age));
 }

 public void destory(){
  System.out.println("销毁User ...");
 }
}

@Configuration
public class SpringConfiguration {
 public SpringConfiguration() {
  System.out.println("初始化Spring容器");
 }
 //@Bean注解注册bean,同时制定初始化和销毁的方法
 @Bean(name = "user", initMethod = "init", destroyMethod = "destory")
 @Scope("prototype")
 public User getUser() {
  return new User("tom", 20);
 }
}

@Component
public class Cat {
 public Cat() {
 }
 public void say() {
  System.out.println("I am a cat" );
 }
}

@Configuration
@ComponentScan(basePackages = "com.spring.annotation.ioc")
public class SpringConfiguration {
 public SpringConfiguration() {
  System.out.println("初始化Spring容器");
 }
 //@Bean注解注册bean,同时制定初始化和销毁的方法
 @Bean(name = "user", initMethod = "init", destroyMethod = "destory")
 @Scope("prototype")
 public User getUser() {
  return new User("tom", 20);
 }
}

初始化Spring容器
初始化User...
Hello,my name is tom,I am 20 years old 
I am a cat