1 基础认知

Spring AOP的基础在SpringAOP的Xml配置 已经做了详细的介绍。请移步SpringAOP的Xml配置

2 Xml配置

xml中增加 <aop:aspectj-autoproxy>

<!--aop的自动代理-->
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

3 注解

标签	作用	运行时机
@Aspect	标注切面类
@Before	指定前置通知	切入点执行之前
@AfterReturning	指定后置通知	切入点执行之后
@Around	指定环绕通知	切入点执行前后都执行
@AfterThrowing	指定异常抛出通知	切入点异常抛出时
@After	指定最终通知	无论是否抛出异常都执行
@Pointcut	指定切点
@DeclareParents	指定添加新接口

Demo:

@Component("studentAspect")
@Aspect
public class StudentAspect implements People {

    @DeclareParents(value = "com.study.aop.Student", defaultImpl = com.study.aop.imp.StudentAspect.class)
    public People people;

    @Before("execution(void com.study.aop.Student.study(..))")
    public void before(JoinPoint joinPoint) {
        //System.out.println(joinPoint.getSignature().getName());
        System.out.println("before, 前置增强 ... " + joinPoint.getArgs()[0]);
    }

    //@AfterReturning(pointcut = "execution( * com.study.aop.Student.study(String,String)) && args(course, teacher)")
    @AfterReturning(pointcut = "execution( * com.study.aop.Student.study(String,String)) && args(course, teacher)", argNames = "course, teacher")
    public void after(String course, String teacher) {
        System.out.println("after-returning, 后置增强 ... " + teacher);
    }

    @Around(value = "execution( * com.study.aop.Student.study(..))")
    public void around(ProceedingJoinPoint joinPoint) throws Throwable {
        System.out.println("around, 环绕增强 ... ");

        Object[] args = joinPoint.getArgs();
        if (args.length > 0) {
            System.out.print("Arguments passed: " );
            for (int i = 0; i < args.length; i++) {
                System.out.print("arg "+(i+1)+": "+args[i]);
            }
        }

        joinPoint.proceed(args);

        System.out.println("around, 运行完 ... ");
    }

    @AfterThrowing(value = "execution( * com.study.aop.Student.study(..))")
    public void throwing() {
        System.out.println("after-throwing, 异常增强 ... ");
    }

    @After(value = "StudentAspect.pointcut(course, teacher)", argNames = "teacher, course")
    public void afterAll(String teacher, String course) {
        System.out.println("after, 最终通知增强 ... " + course + "_" + teacher);
    }


    @Override
    public void eat() {
        System.out.println("吃 吃 吃，就知道吃 ... ");
    }


    @Pointcut(value = "execution( * com.study.aop.Student.study(String,String)) && args(p1, p2)", argNames = "p1, p2")
    public void pointcut(String p1, String p2){}
}

4 Git路径

仓库位置：https://github.com/su-dd/demo.git (opens new window)

代码位置：Spring相关/40Demo (opens new window)

Demo路径：https://github.com/su-dd/KnowledgeStack.git

具体路径：JavaWeb/TestCode/_03_Spring/Demo5