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基于springboot的一些简单工具
There is a newer version: 2.0.5
package com.github.hdy.common.util;

import lombok.experimental.UtilityClass;
import org.springframework.core.BridgeMethodResolver;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.MethodParameter;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.SynthesizingMethodParameter;
import org.springframework.web.method.HandlerMethod;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

/**
 * 类工具类
 *
 * @author 贺大爷
 * @date 2019/6/25
 */
@UtilityClass
public class ClassUtils extends org.springframework.util.ClassUtils {
    private final ParameterNameDiscoverer PARAMETERNAMEDISCOVERER = new DefaultParameterNameDiscoverer();

    /**
     * 获取方法参数信息
     *
     * @param constructor    构造器
     * @param parameterIndex 参数序号
     *
     * @return {MethodParameter}
     */
    public MethodParameter getMethodParameter(Constructor constructor, int parameterIndex) {
        MethodParameter methodParameter = new SynthesizingMethodParameter(constructor, parameterIndex);
        methodParameter.initParameterNameDiscovery(PARAMETERNAMEDISCOVERER);
        return methodParameter;
    }

    /**
     * 获取方法参数信息
     *
     * @param method         方法
     * @param parameterIndex 参数序号
     *
     * @return {MethodParameter}
     */
    public MethodParameter getMethodParameter(Method method, int parameterIndex) {
        MethodParameter methodParameter = new SynthesizingMethodParameter(method, parameterIndex);
        methodParameter.initParameterNameDiscovery(PARAMETERNAMEDISCOVERER);
        return methodParameter;
    }

    /**
     * 获取Annotation
     *
     * @param method         Method
     * @param annotationType 注解类
     * @param             泛型标记
     *
     * @return {Annotation}
     */
    public  A getAnnotation(Method method, Class annotationType) {
        Class targetClass = method.getDeclaringClass();
        // The method may be on an interface, but we need attributes from the target class.
        // If the target class is null, the method will be unchanged.
        Method specificMethod = ClassUtils.getMostSpecificMethod(method, targetClass);
        // If we are dealing with method with generic parameters, find the original method.
        specificMethod = BridgeMethodResolver.findBridgedMethod(specificMethod);
        // 先找方法，再找方法上的类
        A annotation = AnnotatedElementUtils.findMergedAnnotation(specificMethod, annotationType);
        ;
        if (null != annotation) {
            return annotation;
        }
        // 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类
        return AnnotatedElementUtils.findMergedAnnotation(specificMethod.getDeclaringClass(), annotationType);
    }

    /**
     * 获取Annotation
     *
     * @param handlerMethod  HandlerMethod
     * @param annotationType 注解类
     * @param             泛型标记
     *
     * @return {Annotation}
     */
    public  A getAnnotation(HandlerMethod handlerMethod, Class annotationType) {
        // 先找方法，再找方法上的类
        A annotation = handlerMethod.getMethodAnnotation(annotationType);
        if (null != annotation) {
            return annotation;
        }
        // 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类
        Class beanType = handlerMethod.getBeanType();
        return AnnotatedElementUtils.findMergedAnnotation(beanType, annotationType);
    }

}
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