springboot在工具类中注入bean（ApplicationContextAware）

矫情吗；* 2023-06-25 03:04 42阅读 0赞

1、创建测试类1（MyService1.java）

package com.jeff.service;
    
    import org.springframework.stereotype.Service;
    
    @Service
    public class MyService1 { 
    
    	public void save() { 
    		System.out.println(">>>>>>>>>>>>>>> MyService1执行save <<<<<<<<<<<<<<<");
    	}
    
    }

2、创建测试类2（MyService2.java）

package com.jeff.service;
    
    import org.springframework.stereotype.Service;
    
    @Service
    public class MyService2 { 
    
    	public void save() { 
    		System.out.println(">>>>>>>>>>>>>>> MyService2执行save <<<<<<<<<<<<<<<");
    	}
    
    }

3、创建工具类（SpringUtil.java）

package com.jeff.utils;
    
    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 { 
    
    	private static ApplicationContext context;
    
    	@Override
    	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 
    		if (context == null) { 
    			context = applicationContext;
    		}
    	}
    
    	// 获得applicationContext
    	public static ApplicationContext getApplicationContext() throws Exception { 
    		isContext();
    		return context;
    	}
    
    	// 通过class获取Bean
    	public static <T> T getBean(Class<T> clazz) throws Exception { 
    		return getApplicationContext().getBean(clazz);
    	}
    
    	// 通过name获取 Bean
    	public static Object getBean(String name) throws Exception { 
    		return getApplicationContext().getBean(name);
    	}
    
    	// 判断application是否为空
    	public static void isContext() throws Exception { 
    		if (context == null) { 
    			throw new Exception("application未注入");
    		}
    	}
    
    }

4、创建工具类（MyUtil.java）

package com.jeff.utils;
    
    import com.jeff.service.MyService1;
    import com.jeff.service.MyService2;
    
    public class MyUtil { 
    
    	public static void getBean() throws Exception { 
    		SpringUtil.getBean(MyService1.class).save();
    	}
    
    	public static void getBeanByName(String name) throws Exception { 
    		((MyService2) SpringUtil.getBean(name)).save();
    	}
    
    }

5、创建测试类（MyController.java）

package com.jeff.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.jeff.utils.MyUtil;
    
    @RestController
    public class MyController { 
    
    	@RequestMapping("myTest")
    	public String myTest() { 
    		try { 
    			MyUtil.getBean();
    			MyUtil.getBeanByName("myService2");
    		} catch (Exception e) { 
    			e.printStackTrace();
    		}
    		return "success";
    	}
    
    }

6、控制台输出结果  
![在这里插入图片描述][20191224225351849.png]

[20191224225351849.png]: https://img-blog.csdnimg.cn/20191224225351849.png