Spring AOP基于注解的“零配置”方式实现
本文内容纲要:Spring AOP基于注解的“零配置”方式实现
- 为了在Spring中启动@AspectJ支持,需要在类加载路径下新增两个AspectJ库:aspectjweaver.jar和aspectjrt.jar。除此之外,Spring AOP还需要依赖一个aopalliance.jar包
- 定义一个类似ServiceAspect.java这样的切面bean:
1 package com.hyq.aop;
2
3 import org.apache.commons.logging.Log;
4 import org.apache.commons.logging.LogFactory;
5 import org.aspectj.lang.JoinPoint;
6 import org.aspectj.lang.ProceedingJoinPoint;
7 import org.aspectj.lang.annotation.After;
8 import org.aspectj.lang.annotation.AfterReturning;
9 import org.aspectj.lang.annotation.AfterThrowing;
10 import org.aspectj.lang.annotation.Around;
11 import org.aspectj.lang.annotation.Aspect;
12 import org.aspectj.lang.annotation.Before;
13 import org.aspectj.lang.annotation.Pointcut;
14 import org.springframework.stereotype.Component;
15
16 /**
17 * 系统服务组件Aspect切面Bean
18 * @author Shenghany
19 */
20 //声明这是一个组件
21 @Component
22 //声明这是一个切面Bean
23 @Aspect
24 public class ServiceAspect {
25
26 private final static Log log = LogFactory.getLog(ServiceAspect.class);
27
28 //配置切入点,该方法无方法体,主要为方便同类中其他方法使用此处配置的切入点
29 @Pointcut("execution(* com.hyq.aop..*(..))")
30 public void aspect(){ }
31
32 /*
33 * 配置前置通知,使用在方法aspect()上注册的切入点
34 * 同时接受JoinPoint切入点对象,可以没有该参数
35 */
36 @Before("aspect()")
37 public void before(JoinPoint joinPoint){
38 System.out.println("执行before.....");
39 }
40
41 //配置后置通知,使用在方法aspect()上注册的切入点
42 @After("aspect()")
43 public void after(JoinPoint joinPoint){
44 System.out.println("执行after.....");
45 }
46
47 //配置环绕通知,使用在方法aspect()上注册的切入点
48 @Around("aspect()")
49 public void around(JoinPoint joinPoint){
50 long start = System.currentTimeMillis();
51 try {
52 ((ProceedingJoinPoint) joinPoint).proceed();
53 long end = System.currentTimeMillis();
54 if(log.isInfoEnabled()){
55 log.info("around " + joinPoint + "\tUse time : " + (end - start) + " ms!");
56 }
57 } catch (Throwable e) {
58 long end = System.currentTimeMillis();
59 if(log.isInfoEnabled()){
60 log.info("around " + joinPoint + "\tUse time : " + (end - start) + " ms with exception : " + e.getMessage());
61 }
62 }
63 }
64
65 //配置后置返回通知,使用在方法aspect()上注册的切入点
66 @AfterReturning("aspect()")
67 public void afterReturn(JoinPoint joinPoint){
68 if(log.isInfoEnabled()){
69 log.info("afterReturn " + joinPoint);
70 }
71 }
72
73 //配置抛出异常后通知,使用在方法aspect()上注册的切入点
74 @AfterThrowing(pointcut="aspect()", throwing="ex")
75 public void afterThrow(JoinPoint joinPoint, Exception ex){
76 if(log.isInfoEnabled()){
77 log.info("afterThrow " + joinPoint + "\t" + ex.getMessage());
78 }
79 }
80
81 }
3.定义一个业务组件,如:
1 package com.hyq.aop;
2
3 import org.apache.commons.logging.Log;
4 import org.apache.commons.logging.LogFactory;
5 import org.springframework.stereotype.Component;
6 @Component()
7 public class UserService {
8
9 private final static Log log = LogFactory.getLog(UserService.class);
10
11 public User get(long id){
12 if(log.isInfoEnabled()){
13 log.info("getUser method . . .");
14 }
15 return new User();
16 }
17
18 public void save(User user){
19 if(log.isInfoEnabled()){
20 log.info("saveUser method . . .");
21 }
22 }
23
24 public boolean delete(long id) throws Exception{
25 if(log.isInfoEnabled()){
26 log.info("delete method . . .");
27 throw new Exception("spring aop ThrowAdvice演示");
28 }
29 return false;
30 }
31
32 }
业务组件要用@Component()注解修饰
4.在bean.xml中加入下面配置:
1 <!-- 激活组件扫描功能,在包com.hyq.aop及其子包下面自动扫描通过注解配置的组件 -->2 <context:component-scan base-package="com.hyq.aop"/>
3 <!-- 激活自动代理功能 -->
4 <!-- <aop:aspectj-autoproxy proxy-target-class="true"/> -->
5 <aop:aspectj-autoproxy/>
本文内容总结:Spring AOP基于注解的“零配置”方式实现
原文链接:https://www.cnblogs.com/zest/p/5883866.html
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