Discussion on getSignature method of springboot and JoinPoint

getSignature method of JoinPoint

When using springboot to write aop, there is an JoinPoint class, which is used to obtain the information of proxy class and proxy class.

This article records what format is returned by the getSignature method of JoinPoint under 1.

No nonsense, stick the code

package org.aspectj.lang; 
public interface Signature {
    String toString(); 
    String toShortString(); 
    String toLongString(); 
    String getName(); 
    int getModifiers(); 
    Class getDeclaringType(); 
    String getDeclaringTypeName();
}

Printout, getString is the method name of the test class, and TestController is the class name

joinPoint.getSignature().toString():String com.fast.web.controller.TestController.getString()
joinPoint.getSignature().toShortString():TestController.getString()
joinPoint.getSignature().toLongString():public java.lang.String com.fast.web.controller.TestController.getString()
joinPoint.getSignature().getName():getString
joinPoint.getSignature().getModifiers():1
joinPoint.getSignature().getDeclaringType():class com.fast.web.controller.TestController
joinPoint.getSignature().getDeclaringTypeName():com.fast.web.controller.TestController

The colon is preceded by the method used, followed by the output of this test.

Attach the class under test:

package com.fast.web.controller;
import com.fast.framework.dao.TestDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController; 
@RestController
public class TestController {
 
    @Autowired
    private TestDao testDao;
 
    @RequestMapping("/test")
    public String getString() {
        int i = testDao.selectBase();
        return String.valueOf(i);
    }
}

springboot annotated AOP obtains parameters through JoinPoint

When developing before, you need to get the parameter value of tangent point annotation, and record it under 1

Section notes:

The @ Aspect identity is 1 section for the container to read and acts on the class

@ Pointcut (Entry Point): Is a connection point with notifications

@ Before front

@ AfterThrowing exception thrown

@ After post

Post enhancement of @ AfterReturning, followed by @ After

@ Around Wrap

1. Related maven package

 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-aop</artifactId>
 </dependency>

2. Customize 1 interface

import java.lang.annotation.*;
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Action {
    String value() default "list";
}

3. Define the section class

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
@Aspect
@Component
public class ActAspect {
 
 @AfterReturning("@annotation( Package name .Action)")
    public void afterReturning(JoinPoint point){
    
  //  Get the pointcut method name 
  String methodName = point.getSignature().getName();
  
     //  Get parameter values in comments 
        MethodSignature methodSignature = (MethodSignature)point.getSignature();
        Method method = methodSignature.getMethod();
        //  Get annotations Action 
        Action annotation = method.getAnnotation(Action.class);
        //  Get annotations Action Adj. value The value of the parameter 
        String value = annotation.value();
        
        //  Get the entry list of tangent point methods 
        Object[] objArray = point.getArgs();
        //  The following code is modified according to the specific input type 
        List<String> list = new ArrayList<>();
        for (Object obj: objArray) {
            if(obj instanceof Collection){
                list = (List<String>) obj;
            }
        }
    }    
}