Spring AOP

深碍√TFBOYSˉ_ 2021-09-24 21:48 316阅读 0赞

注意  
1，Spring AOP只能切被Spring管理的非静态类  
2，AOP相当于就是做个"统一log记录"的"动态代理"  
3，定义切入点，要指定到controller，或者其他包 ！指定全部包的话可能log会被打印2次及以上（原因大概就是代理多了）  
4，设置下包路径 运行程序看代码 先后顺序 一目了然  
5，我是运行在springboot2…3.4上

import org.apache.log4j.Logger;
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.ProceedingJoinPoint;
    import org.aspectj.lang.annotation.After;
    import org.aspectj.lang.annotation.AfterReturning;
    import org.aspectj.lang.annotation.AfterThrowing;
    import org.aspectj.lang.annotation.Around;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.aspectj.lang.annotation.Pointcut;
    import org.springframework.core.annotation.Order;
    import org.springframework.stereotype.Component;
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    import javax.servlet.http.HttpServletRequest;
    import java.util.Arrays;
    
    @Aspect // 声明切面
    @Component // bean注入
    @Order(0) // 代理优先级0123 0最高级
    public class WebLogAcpect { 
    	// 统计请求的处理时间
    	ThreadLocal<Long> startTime = new ThreadLocal<>();
    	// private Logger logger = LoggerFactory.getLogger(WebLogAcpect.class);
    	protected final Logger logger = Logger.getLogger(this.getClass());
    
    	/** * 定义切入点，切入点为com.softwaer.road.controller 下的所有函数 */
    	@Pointcut("execution(public * com.softwaer.road.controller..*.*(..))")
    	public void webLog() { 
    	}
    
    	/** * 最先进入也是最后执行完 * * @param pjp * @throws Throwable */
    	@Around("webLog()")
    	public Object around(ProceedingJoinPoint pjp) throws Throwable { 
    		startTime.set(System.currentTimeMillis());
    		logger.info("执行顺序( pjp.proceed()前)@Around=====================================================================1");
    		Object result=0;
    		try { 
    
    			   result = pjp.proceed();
    			
    		} catch (Exception e) { 
    			// TODO: handle exception
    			logger.info("( pjp.proceed()后)@Around---------------------------------------异常");
    		}
    		logger.info("Controller方法执行时间:" + (System.currentTimeMillis() - startTime.get()) + " ms");
    		logger.info("执行顺序( pjp.proceed()后)@Around======================================================================5");
    	
    		return result;
    	}
    
    	/** * 前置通知：在连接点之前执行的通知 第二个进入的方法 * * @param joinPoint * @throws Throwable */
    	@Before("webLog()")
    	public void doBefore(JoinPoint joinPoint) throws Throwable { 
    		// 接收到请求，记录请求内容
    		ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    
    		logger.info("执行顺序@Before=================================================2");
    
    		if (attributes != null) { 
    			HttpServletRequest request = attributes.getRequest();
    			logger.info("URL : " + request.getRequestURL().toString());
    			logger.info("HTTP_METHOD : " + request.getMethod());
    			logger.info("IP : " + request.getRemoteAddr());
    		}
    
    		logger.info("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "."
    				+ joinPoint.getSignature().getName());
    		logger.info("ARGS : " + Arrays.toString(joinPoint.getArgs()));
    	}
    
    	/** * 方法执行后通知 第三个进入的方法 * * @param ret * @throws Throwable */
    	@AfterReturning(returning = "ret", pointcut = "webLog()")
    	public void doAfterReturning(Object ret) throws Throwable { 
    		logger.info("执行顺序@AfterReturning==================================3");
    		// 处理完请求，返回内容
    		logger.info("RESPONSE : " + ret);
    
    	}
    
    	/** * 第四个进入的方法 */
    	@After("webLog()")
    	public void after() { 
    		logger.info("执行顺序@After======================================================4");
    	}
    
    	/** * 在方法出现异常时会执行的代码 可以访问到异常对象，可以指定在出现特定异常时在执行通知代码 * 与@AfterReturning打印返回值顺序同为3 */
    	@AfterThrowing(value = "webLog()", throwing = "ex")
    	public void afterThrowing(JoinPoint joinPoint, Exception ex) { 
    		String methodName = joinPoint.getSignature().getName();
    		logger.info("执行顺序@AfterThrowing err==================================3");
    		logger.info("方法出现异常 The method " + methodName + " occurs exception: " + ex);
    	}
    }