Spring Boot在普通类中注入Bean

本是古典何须时尚 2023-10-09 18:27 18阅读 0赞

### Spring Boot在普通类中注入Bean ###

**1:在Controller Service 等中，直接@ Autowired注入bean就好。  
但在普通类中这样注入会提示null。  
对于此类的bean的注入，可以implements ApplicationContextAware。**

如下面：调用方式为：

> UserService userservice = (UserService)  
> SpringContextUtils.getBean(UserService.class);

import org.springframework.beans.BeansException;
    
    import org.springframework.context.ApplicationContext;
    
    import org.springframework.context.ApplicationContextAware;
    
    import org.springframework.stereotype.Component;
    
     
    
    @Component
    
    public class SpringContextUtils implements ApplicationContextAware {
        
    
     
    
       
    
       private static ApplicationContext applicationContext;
    
     
    
       @Override
    
       public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        
    
           this.applicationContext = applicationContext;
    
       }
    
     
    
       
    
       public static ApplicationContext getApplicationContext() {
        
    
           return applicationContext;
    
       }
    
     
    
       
    
       public static Object getBean(String name) {
        
    
           return getApplicationContext().getBean(name);
    
       }
    
     
    
       
    
       public static T getBean(Class clazz) {
        
    
           return getApplicationContext().getBean(clazz);
    
       }
    
     
    
       
    
       public static T getBean(String name, Class clazz) {
        
    
           return getApplicationContext().getBean(name, clazz);
    
       }
    
    }