spring的xml与注解对比

以你之姓@ 2022-03-16 07:14 197阅读 0赞

前文：

Spring是一个轻量级的IoC和AOP容器框架。是为Java应用程序提供基础性服务的一套框架，目的是用于简化企业应用程序的开发，它使得开发者只需要关心业务需求。

一、spring概念

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjY4NzA3NA_size_16_color_FFFFFF_t_70][]

二、spring容器及清单

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjY4NzA3NA_size_16_color_FFFFFF_t_70 1][]

三、xml创建对象和获取

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjY4NzA3NA_size_16_color_FFFFFF_t_70 2][]

四、spring核心

1.IOC控制反转

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjY4NzA3NA_size_16_color_FFFFFF_t_70 3][]

2.DI注入

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjY4NzA3NA_size_16_color_FFFFFF_t_70 4][]

3.AOP面向切面

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjY4NzA3NA_size_16_color_FFFFFF_t_70 5][]

切面类(xml版本)
    
    public class TransactionManager {
    	public void begin(JoinPoint jp){
    		System.out.println("开启事务/前置通知");
    	}
    	public void commit(JoinPoint jp,Object returnValue){
    		System.out.println("提交事务/后置通知");
    	}
    	public void rollback(JoinPoint jp,Throwable ex){
    		System.out.println("回滚事务/异常通知");
    	}
    	public void finallyMethod(JoinPoint jp){
    		System.out.println("释放资源/最终通知");
    	}
    	
    	public Object around(ProceedingJoinPoint pjp) throws Throwable {
    	    Object returnValue=null;
    	    try{
    	    	//写前置通知
    	    	System.out.println("开启事务/前置通知");
    	    	returnValue = pjp.proceed();//调用老的业务方法
    	    	//写后置通知
    			System.out.println("提交事务/后置通知");  	
    	    }catch(Exception e){
    	    	e.printStackTrace();
    	    	//写异常通知
    			System.out.println("回滚事务/异常通知");
    	    }finally{
    			System.out.println("释放资源/最终通知");
    	    }  
    	    return returnValue;
    	}
    }
    
    spring.xml配置
    
    <aop:config  >
    	
    	<aop:aspect id="txAspect" ref="transactionManager">
    		
    		<aop:pointcut expression="execution(* com.tarena.service..*.*(..))" 
    					  id="myPointCut"/>
    		
    		<aop:around pointcut-ref="myPointCut"
    					method="around"/>
    	</aop:aspect>
    </aop:config>

切面类(@注解版)
    
    @Component("transactionManager")
    @Aspect
    public class TransactionManager {
    	@Pointcut("execution(* com.tarena.service..*.*(..))")// the pointcut expression
    	public void myPointCut() {}// the pointcut signature
    	
    	@Before(value="myPointCut()")
    	public void begin(JoinPoint jp){
    		System.out.println("非around开启事务/前置通知");
    	}
    	@AfterReturning(pointcut="myPointCut()",returning="returnValue")
    	public void commit(JoinPoint jp,Object returnValue){
    		System.out.println("非around提交事务/后置通知");
    	}
    	@AfterThrowing(pointcut="myPointCut()",throwing="ex")
    	public void rollback(JoinPoint jp,Throwable ex){
    		System.out.println("非around回滚事务/异常通知");
    	}
    	@After(value="myPointCut()")
    	public void finallyMethod(JoinPoint jp){
    		System.out.println("非around释放资源/最终通知");
    	}
    	@Around(value="myPointCut()")
        public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable {
    		Object returnValue=null;
    	    try{
    	    	//写前置通知
    	    	System.out.println("前置通知");
    	    	returnValue = pjp.proceed();//调用老的业务方法
    	    	//写后置通知
    	    	System.out.println("around目标方法的返回值:"+returnValue);	    	
    	    }catch(Exception e){
    	    	e.printStackTrace();
    	    	//写异常通知
    	    	System.out.println("around异常信息:"+e.getMessage());
    	    }finally{
    	    	System.out.println("around最终通知");
    	    }
    	   
    	    return returnValue;
        }
    }
    
    spring.xml配置
    
    
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>

四、相关知识

1. BeanFactory 及与FactoryBean的区别

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjY4NzA3NA_size_16_color_FFFFFF_t_70 6][]

2. Spring Bean

(1)生命周期：由Spring 控制对象的创建和销毁

(2)加载过程：

![20190504175228698.png][]

3. 事务管理

![20190504175424244.png][]

4.其他

Spring面试题:[https://blog.csdn.net/a745233700/article/details/80959716][https_blog.csdn.net_a745233700_article_details_80959716]

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[20190504175228698.png]: /images/20220316/986d0293208b4bac92715e0e68771343.png
[20190504175424244.png]: /images/20220316/2012b4224100441aa61fb1eeac3a28b4.png
[https_blog.csdn.net_a745233700_article_details_80959716]: https://blog.csdn.net/a745233700/article/details/80959716