aop切面、注解和参数怎么获取

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在工作中会经常使用aop，这里将aop使用基本方法，获取在切点中使用的获取参数、注解做一个样例。

定义需要切面的注解

@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface AnnDemo {    String value();    boolean isAop() default true;}

在需要进行切面的方法标注注解

@RestController@RequestMapping("/order")public class OrderController {    @Autowired    private OrderService orderService;    @RequestMapping("/all")    @AnnDemo(value = "all",isAop = false)    public List findAll() {        List list = orderService.getOrderList();        return list;    }    @RequestMapping("/page")    @AnnDemo(value = "page")    public List findPage(@RequestParam("username") String username) {        List listPage = orderService.getOrdersListPage();        return listPage;    }}

定义切面

在切面中获取切点注解，方法，参数的获取

@Aspect@Componentpublic class AspectDemo {    @Pointcut(value = "execution(* com.yin.freemakeradd.controller..*(..))")    public void excetionMethod() {}    @Pointcut(value = "execution(* com.yin.freemakeradd.controller..*(..)) && @annotation(AnnDemo)")    public void excetionNote() { }    @Before("excetionMethod()")    public void testBefore(JoinPoint joinPoint) {        System.out.println("----------------------------前置通知---");        Object[] args = joinPoint.getArgs();        for (Object arg : args) {            System.out.println(arg);        }    }    @Around(value = "execution(* com.yin.freemakeradd.controller..*(..)) && @annotation(AnnDemo)")    public Object  testBeforeNote(ProceedingJoinPoint joinPoint) throws Throwable {        //用的最多通知的签名        Signature signature = joinPoint.getSignature();        MethodSignature msg=(MethodSignature) signature;        Object target = joinPoint.getTarget();        //获取注解标注的方法        Method method = target.getClass().getMethod(msg.getName(), msg.getParameterTypes());        //通过方法获取注解        AnnDemo annotation = method.getAnnotation(AnnDemo.class);        Object proceed;        //获取参数        Object[] args = joinPoint.getArgs();        System.out.println(annotation.value());        System.out.println(annotation.isAop());        for (Object arg : args) {            System.out.println(arg);        }        if (Objects.isNull(annotation) || !annotation.isAop()) {            System.out.println("无需处理");            proceed = joinPoint.proceed();        }else {            System.out.println("进入aop判断");            proceed = joinPoint.proceed();            if(proceed instanceof List){                List proceedLst = (List) proceed;                if(!CollectionUtils.isEmpty(proceedLst)){                    TbOrder tbOrder = new TbOrder();                    tbOrder.setPaymentType("fffffffffffffffffff");                    ArrayList tbOrderLst = new ArrayList<>();                    tbOrderLst.add(tbOrder);                    return tbOrderLst;                }            }            System.out.println(proceed);        }        return proceed;    }}

aop中获取自定义注解的属性值

自定义注解

@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)public @interface SystemLog {     public String description() default "";}

用在方法上

@ResponseBody@ValidRequestBody@RequestMapping("/login")@SystemLog(description="登录")public GlobalResponse login(@RequestBody @Valid User user, BindingResult bindingResult){    ......}

获取注解的属性值

@Around("@annotation(com.xxx.xxx.xxx.SystemLog)")public Object around(ProceedingJoinPoint joinPoint) throws Throwable{    SystemLog systemLog = ((MethodSignature)joinPoint.getSignature()).getMethod().getAnnotation(SystemLog.class);        ......}

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