Spring AOP：自動注入參數值

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

@Aspect
@Component
public class HandleParamAop {

    @Pointcut("@annotation(org.springframework.web.bind.annotation.RequestMapping)")
    public void handleParamAop() {
    }

    @Before("handleParamAop()")
    public void paramHandler(JoinPoint joinPoint) throws Throwable {
        Object[] argc = joinPoint.getArgs();
        Class clazz;
        Method[] methods;
        for (Object object : argc) {
            if (null == object) {
                continue;
            }
            clazz = object.getClass();
            methods = clazz.getMethods();
            // 這里的methods會包含父類的public方法，也包括Object類的method
            for (Method method : methods) {
                if (method.getName().equals("setCreator")) {
                    method.invoke(object, 49L);
                }
                if (method.getName().equals("setModifier")) {
                    method.invoke(object, 59L);
                }
            }
        }
    }

}