前言:
有时候我们在用Spring Aop面向切面编程,需要获取连接点(JoinPoint)方法参数名、参数值。
环境:
- Mac OSX
- Intellij IDEA
- Spring Boot 2x
- Jdk 1.8x
Code:
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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 {
/**
* 环绕通知
* @param proceedingJoinPoint
* @return
* @throws Throwable
*/
@Around (value = "execution(* com.example.aopdemo..*(..)))" )
public Object demoAop(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
log.debug( "执行前:" );
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(); //执行连接点方法,object:方法返回值
log.debug( "执行后:" );
return object;
}
/**
* 获取参数Map集合
* @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;
}
}
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AOP切面获取参数的一个小技巧
一般来说,我们的参数,都是通过json传递的,那么这个问题就转化成了,从json中获取指定字符串的问题。
OK,这个问题就简单了。
如下:
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public static void main(String[] args) {
// 这里JSONObject是fastjson-1.2.41.jar包下的
JSONObject jsonObject = JSON.parseObject( "{\"timeStamp\":21602756894612,\"status\":0,\"results\":{\"userName\":\"yang20102\",\"userLevel\":\"3\"},\"errorCode\":null,\"errorMessage\":null}" );
// 获取json最外层字符串
Object timeStamp = jsonObject.get( "timeStamp" );
System.out.println( "timeStamp:" + timeStamp);
// 获取复杂对象
Object results = jsonObject.get( "results" );
JSONObject jsonObjectResults = JSON.parseObject(results.toString());
Object userName = jsonObjectResults.get( "userName" );
System.out.println( "userName:" + userName);
}
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实例json如下:
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{
"timeStamp" : 21602756894612 ,
"status" : 0 ,
"results" : {
"userName" : "yang20102" ,
"userLevel" : "3"
},
"errorCode" : null ,
"errorMessage" : null
}
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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/weixin_39931896/article/details/83451311