本文介绍了利用注解配置Spring容器的方法，分享给大家，具体如下：
@Configuration标注在类上,相当于将该类作为spring的xml的标签
@Configuration
public class SpringConfiguration {
public SpringConfiguration() {
System.out.println("初始化Spring容器");
}
}
主函数进行测试
public class Main {
public static void main(String[] args) {
ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfiguration.class);
}
}
利用注解AnnotationConfigApplicationContext加载ApplicationContext
运行结果如下
信息: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@2e5d6d97: startup date [Sat Dec 09 11:29:51 CST 2017]; root of context hierarchy
初始化Spring容器
利用@Bean向容器中添加bean实例
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);
}
}
@Bean注解在返回实例的方法上,如果没有指定bean的名字,则默认与标注的方法名称相同
@Bean注解默认作用域为单例的Singleton作用域
利用@ComponentScan添加自动扫描@Service,@Ripository,@Controller,@Component注解
@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);
}
}
利用basePackages扫描包配置路径
运行结果如下
初始化Spring容器 初始化User... Hello,my name is tom,I am 20 years old I am a cat
