Spring Boot -- Main调用service接口

r囧r小猫 2023-05-30 03:45 11阅读 0赞

## Spring Boot – Main调用service接口 ##

添加工具类，继承ApplicationAware

package com.example.demo.configration;
    
    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
    
    
    @Component
    public class SpringUtil implements ApplicationContextAware { 
    
    
        /** * 普通类调用Spring bean对象： * 注意：此类需要放到App.java同包或者子包下才能被扫描，否则失效。 */
    
        private static ApplicationContext applicationContext = null;
    
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 
            if (SpringUtil.applicationContext == null) { 
                SpringUtil.applicationContext = applicationContext;
            }
    
        }
    
        //获取applicationContext
        public static ApplicationContext getApplicationContext() { 
            return applicationContext;
        }
    
    
        //通过name获取 Bean.
        public static Object getBean(String name) { 
            return getApplicationContext().getBean(name);
    
        }
    
        //通过class获取Bean.
        public static <T> T getBean(Class<T> clazz) { 
            return getApplicationContext().getBean(clazz);
        }
    
        //通过name,以及Clazz返回指定的Bean
        public static <T> T getBean(String name, Class<T> clazz) { 
            return getApplicationContext().getBean(name, clazz);
        }
    
    }

SpringBoot自动装配，如果想拿去它的一个Bean需要调用applicationAware的set方法，得到Application环境。然后拿到这个环境生产出你需要的Bean

调用使用

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