业务类
1 package cn.itcast.aop; 2 3 import org.aspectj.lang.JoinPoint; 4 import org.aspectj.lang.ProceedingJoinPoint; 5 import org.aspectj.lang.Signature; 6 import org.aspectj.lang.annotation.*; 7 import org.springframework.core.annotation.Order; 8 import org.springframework.stereotype.Component; 9 10 import java.util.Arrays; 11 12 @Component 13 @Order 14 @Aspect 15 public class Logger { 16 //切点抽取 17 @Pointcut("execution(* cn.itcast..*.*(..))") 18 public void p(){} 19 20 @Before("Logger.p()") 21 public void before(JoinPoint jp) { 22 String methodName = jp.getSignature().getName(); 23 Object[] args = jp.getArgs(); 24 System.out.println("methodName:" + methodName + " args:" + Arrays.toString(args)); 25 System.out.println(); 26 System.out.println("before"); 27 // int i = 1 / 0; 28 } 29 @After("Logger.p()") 30 public void after(){ 31 System.out.println("after"); 32 } 33 34 /* @Around("p()") 35 public Object around(ProceedingJoinPoint jp) throws Throwable { 36 System.out.println("around前"); 37 Object result = jp.proceed(); 38 System.out.println("around后"); 39 return result; 40 }*/ 41 42 //可以强转为连接点返回的类型,没有问题。 43 /* @Around("p()") 44 public int around(ProceedingJoinPoint jp) throws Throwable { 45 System.out.println("around前"); 46 Object result = jp.proceed(); 47 System.out.println("around后"); 48 return (int) result + 5; 49 }*/ 50 51 /* 52 注意:如果连接点方法有返回值,则环绕必须给返回值,不然的话返回null。 53 1.如果afterReturnning在around后,而around中获取参数可能出问题 54 2.业务中调用连接点方法获取返回值时可能会出问题 55 */ 56 @Around("p()") 57 public void around(ProceedingJoinPoint jp) throws Throwable { 58 System.out.println("around前"); 59 jp.proceed(); 60 System.out.println("around后"); 61 } 62 63 /*@AfterReturning(value = "p()", returning = "result") 64 public void afterReturning(JoinPoint jp, int result){ 65 66 String methodName = jp.getSignature().getName(); 67 Object[] args = jp.getArgs(); 68 System.out.println("methodName:" + methodName + " args" 69 + Arrays.toString(args) + " result:" + result); 70 System.out.println("afterReturning"); 71 }*/ 72 73 /*@AfterReturning(value="p()", returning = "result") 74 public void afterReturning(int result){ 75 System.out.println("result:" + result); 76 System.out.println("afterReturning"); 77 }*/ 78 @AfterReturning("p()") 79 public void afterReturning(){ 80 System.out.println("afterReturning"); 81 } 82 83 @AfterThrowing("p()") 84 public void afterThrowing(){ 85 System.out.println("afterThrowing"); 86 // int i = 1 / 0; 87 } 88 }
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:aop="http://www.springframework.org/schema/aop" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 6 xsi:schemaLocation=" 7 http://www.springframework.org/schema/beans 8 http://www.springframework.org/schema/beans/spring-beans.xsd 9 http://www.springframework.org/schema/aop 10 http://www.springframework.org/schema/aop/spring-aop.xsd 11 http://www.springframework.org/schema/context 12 http://www.springframework.org/schema/context/spring-context.xsd"> 13 14 <!--业务类--> 15 <bean id="userService" class="cn.itcast.aop.UserService"></bean> 16 <!--切面类--> 17 <!--<bean id="logger" class="cn.itcast.aop.Logger"></bean>--> 18 19 <!--组件扫描--> 20 <context:component-scan base-package="cn.itcast"></context:component-scan> 21 22 <!--开启aop代理--> 23 <!--<aop:aspectj-autoproxy></aop:aspectj-autoproxy>--> 24 25 <!--织入--> 26 <aop:config> 27 <aop:aspect ref="logger"> 28 <aop:after-returning method="afterReturning" pointcut="execution(public void cn.itcast.aop.UserService.deleteById(int))"></aop:after-returning> 29 <aop:around method="around" pointcut="execution(public void cn.itcast.aop.UserService.deleteById(int))"></aop:around> 30 <aop:before method="before" pointcut="execution(public void cn.itcast.aop.UserService.deleteById(int))"></aop:before> 31 <aop:after-throwing method="afterThrowing" pointcut="execution(public void cn.itcast.aop.UserService.deleteById(int))"></aop:after-throwing> 32 <aop:after method="after" pointcut="execution(public void cn.itcast.aop.UserService.deleteById(int))"></aop:after> 33 <!--<aop:around method="start" pointcut="execution(public void cn.itcast.aop.UserService.deleteById(int))"></aop:around>--> 34 </aop:aspect> 35 </aop:config> 36 37 </beans>
1 package cn.itcast; 2 3 import cn.itcast.aop.UserService; 4 import org.junit.Test; 5 import org.junit.runner.RunWith; 6 import org.springframework.beans.factory.annotation.Autowired; 7 import org.springframework.test.context.ContextConfiguration; 8 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; 9 10 @RunWith(SpringJUnit4ClassRunner.class) 11 @ContextConfiguration("classpath:applicationContext.xml") 12 public class AOPTest { 13 14 @Autowired 15 private UserService userService; 16 17 @Test 18 public void test(){ 19 // int i = userService.deleteById(5); 20 // System.out.println(i); 21 userService.deleteById(5); 22 } 23 }