使用spring通过aop获取方法参数和参数值

spring通过aop获取方法参数和参数值

自定义注解

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

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
@Aspect
public 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

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

2、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;
    }
}

3、定义切面

在切面中获取切点注解，方法，参数的获取

@Aspect
@Component
public 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猪先飞。