Spring Aop How to Get Parameter Names and Parameter Values
- 2021-11-01 03:27:41
- OfStack
Foreword:
Sometimes when we are programming with Spring Aop, we need to get the parameter name and parameter value of the connection point (JoinPoint) method.
Environment:
Mac OSX Intellij IDEA Spring Boot 2x Jdk 1.8xCode:
package com.example.aopdemo.aop;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.CodeSignature;
import org.springframework.stereotype.Component;
import java.util.HashMap;
import java.util.Map;
/**
* DemoAop
* Create by Gray(Ganguocai@outlook.com)
*/
@Aspect
@Component
@Slf4j
public class DemoAop {
/**
* Surround notification
* @param proceedingJoinPoint
* @return
* @throws Throwable
*/
@Around(value = "execution(* com.example.aopdemo..*(..)))")
public Object demoAop(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
log.debug(" Before implementation: ");
Map<String, Object> params = getNameAndValue(proceedingJoinPoint);
for (Map.Entry<String, Object> entry : params.entrySet()) {
System.out.println("name: " + entry.getKey() + " value: " + entry.getValue());
}
Object object = proceedingJoinPoint.proceed(); // Execute the join point method, object Method return value
log.debug(" After implementation: ");
return object;
}
/**
* Get parameters Map Set
* @param joinPoint
* @return
*/
Map<String, Object> getNameAndValue(ProceedingJoinPoint joinPoint) {
Map<String, Object> param = new HashMap<>();
Object[] paramValues = joinPoint.getArgs();
String[] paramNames = ((CodeSignature)joinPoint.getSignature()).getParameterNames();
for (int i = 0; i < paramNames.length; i++) {
param.put(paramNames[i], paramValues[i]);
}
return param;
}
}
A Tip for Obtaining Parameters of AOP Section
1 Generally speaking, our parameters are passed through json, so this problem turns into a problem of getting the specified string from json.
OK, the problem is simple.
As follows:
public static void main(String[] args) {
// Here JSONObject Yes fastjson-1.2.41.jar Under the bag
JSONObject jsonObject = JSON.parseObject("{\"timeStamp\":21602756894612,\"status\":0,\"results\":{\"userName\":\"yang20102\",\"userLevel\":\"3\"},\"errorCode\":null,\"errorMessage\":null}");
// Get json Outermost string
Object timeStamp = jsonObject.get("timeStamp");
System.out.println("timeStamp:" + timeStamp);
// Get complex objects
Object results = jsonObject.get("results");
JSONObject jsonObjectResults = JSON.parseObject(results.toString());
Object userName = jsonObjectResults.get("userName");
System.out.println("userName:" + userName);
}
Example json is as follows:
{
"timeStamp": 21602756894612,
"status": 0,
"results": {
"userName": "yang20102",
"userLevel": "3"
},
"errorCode": null,
"errorMessage": null
}