<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
package com.example.demo; public class Person { private String name; public Person() { System.out.println("person init .."); } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "Person{" + "name='" + name + '\'' + '}'; } }
package com.example.demo; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; public class ContextUtil{ public ContextUtil () { } private static ApplicationContext applicationContext = null; public static void setApplicationContext(ApplicationContext applicationContext) throws BeansException { ContextUtil.applicationContext = applicationContext; } public static Object getObject(String beanName) { if (applicationContext == null) { throw new RuntimeException("applicationContext is null"); } return applicationContext.getBean(beanName); } }
package com.example.demo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.Bean; @SpringBootApplication public class DemoApplication { public static void main(String[] args) { ApplicationContext context = SpringApplication.run(DemoApplication.class, args); ContextUtil.setApplicationContext(context); // 在这里把加载好的ApplicationContext设置到静态类中,以后通过这个类取Spring容器中的bean Person person = (Person)ContextUtil.getObject("p"); System.out.println(person); } @Bean(name = "p") public Person person() { Person person = new Person(); person.setName("小明"); return person; } }