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 1.8xCode:
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 { /** * 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; } }
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:
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); }
实例json如下:
{ "timeStamp": 21602756894612, "status": 0, "results": { "userName": "yang20102", "userLevel": "3" }, "errorCode": null, "errorMessage": null }
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。