Using spring to get method parameters and parameter values through aop

Directory spring obtains method parameters and parameter values through aop, user-defined annotation section aop section annotation, parameter obtains 1, defines annotation of required section 2, annotation of method requiring section 3, defines section

spring obtains method parameters and parameter values through aop

Custom annotations

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 {
}

Sectional plane

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;
 
/**
 *  Gets the annotation value on the method 
 */
@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();
        //  Parameter value 
        Object[] args = joinPoint.getArgs();
        Class<?>[] classes = new Class[args.length];
        for (int k = 0; k < args.length; k++) {
            if (!args[k].getClass().isPrimitive()) {
                //  Gets the encapsulated type instead of the underlying type 
                String result = args[k].getClass().getName();
                Class s = map.get(result);
                classes[k] = s == null ? args[k].getClass() : s;
            }
        }
        ParameterNameDiscoverer pnd = new DefaultParameterNameDiscoverer();
        //  Gets the specified method, the 2 You can not pass a parameter, but in order to prevent overloading, you still need to pass in the type of the parameter 
        Method method = Class.forName(classType).getMethod(methodName, classes);
        //  Parameter name 
        String[] parameterNames = pnd.getParameterNames(method);
        //  Pass map Package parameters and parameter values 
        HashMap<String, Object> paramMap = new HashMap();
        for (int i = 0; i < parameterNames.length; i++) {
            paramMap.put(parameterNames[i], args[i]);
            System.out.println(" Parameter name: "+parameterNames[i]+"\n Parameter value "+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 section annotation, parameter acquisition

In the work will often use aop, here will use aop basic method, access to the tangent point used in the acquisition parameters, annotations do a sample.

1. Define the annotations that need to be cut

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

2. Mark annotations in the method that needs to be cut

@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. Define the section

Obtain tangent point annotations, methods and parameters in tangent plane

@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("---------------------------- Pre-notification ---");
        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 {
        // Signature with the most notifications used 
        Signature signature = joinPoint.getSignature();
        MethodSignature msg=(MethodSignature) signature;
        Object target = joinPoint.getTarget();
        // Method to get annotation annotation 
        Method method = target.getClass().getMethod(msg.getName(), msg.getParameterTypes());
        // Get annotations through methods 
        AnnDemo annotation = method.getAnnotation(AnnDemo.class);
        Object proceed;
        // Get parameters 
        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(" No processing required ");
            proceed = joinPoint.proceed();
        }else {
            System.out.println(" Enter aop Judge ");
            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;
    }
}