本篇内容介绍了“aop切面、注解和参数怎么获取”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
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<TbOrder> findAll() { List<TbOrder> list = orderService.getOrderList(); return list; } @RequestMapping("/page") @AnnDemo(value = "page") public List<TbOrder> findPage(@RequestParam("username") String username) { List<TbOrder> 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<TbOrder> 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); ......}“aop切面、注解和参数怎么获取”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注编程网网站，小编将为大家输出更多高质量的实用文章！
