spring通过aop获取方法参数和参数值
自定义注解
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package com.xiaolc.aspect; import java.lang.annotation.*; /** * @author lc * @date 2019/9/10 */@Documented@Target({ElementType.TYPE, ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)public @interface LiCheng {} |
切面
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package com.xiaolc.aspect; import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.springframework.core.DefaultParameterNameDiscoverer;import org.springframework.core.ParameterNameDiscoverer;import org.springframework.stereotype.Component; import java.lang.reflect.Method;import java.util.HashMap;import java.util.Map; /** * 获取方法上的注解值 */@Component@Aspectpublic class AuditAnnotationAspect { @Around("@annotation(liCheng))") private static Map getFieldsName(ProceedingJoinPoint joinPoint,LiCheng liCheng) throws ClassNotFoundException, NoSuchMethodException { String classType = joinPoint.getTarget().getClass().getName(); String methodName = joinPoint.getSignature().getName(); // 参数值 Object[] args = joinPoint.getArgs(); Class<?>[] classes = new Class[args.length]; for (int k = 0; k < args.length; k++) { if (!args[k].getClass().isPrimitive()) { // 获取的是封装类型而不是基础类型 String result = args[k].getClass().getName(); Class s = map.get(result); classes[k] = s == null ? args[k].getClass() : s; } } ParameterNameDiscoverer pnd = new DefaultParameterNameDiscoverer(); // 获取指定的方法，第二个参数可以不传，但是为了防止有重载的现象，还是需要传入参数的类型 Method method = Class.forName(classType).getMethod(methodName, classes); // 参数名 String[] parameterNames = pnd.getParameterNames(method); // 通过map封装参数和参数值 HashMap<String, Object> paramMap = new HashMap(); for (int i = 0; i < parameterNames.length; i++) { paramMap.put(parameterNames[i], args[i]); System.out.println("参数名："+parameterNames[i]+"\n参数值"+args[i]); } return paramMap; } private static HashMap<String, Class> map = new HashMap<String, Class>() { { put("java.lang.Integer", int.class); put("java.lang.Double", double.class); put("java.lang.Float", float.class); put("java.lang.Long", Long.class); put("java.lang.Short", short.class); put("java.lang.Boolean", boolean.class); put("java.lang.Char", char.class); } };} |
aop切面 注解、参数获取
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。
1、定义需要切面的注解
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@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface AnnDemo { String value(); boolean isAop() default true;} |
2、在需要进行切面的方法标注注解
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@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; }} |
3、定义切面
在切面中获取切点注解，方法，参数的获取
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@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; }} |
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_41988504/article/details/100726527
