用 hutool 的 ClassUtil.scanPackage

举例

    public static void test1() {
        Set<Class<?>> clazzList = ClassUtil.scanPackage("com.kedu.scm", Class::isEnum);
        for (Class<?> clazz : clazzList) {
            System.out.println(clazz);
            Object[] enumConstants = clazz.getEnumConstants();
            Arrays.stream(enumConstants).forEach(System.out::println);
        }
    }

运行结果

class com.fangye.base.enums.YesOrNoEnum
YES
NO

利用spring自写scanPackage

package com.fangye.base.util;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.classreading.SimpleMetadataReaderFactory;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;

/**
 * class 工具类
 *
 * @author qizenan
 * @date 2023/07/13
 */
@Slf4j
public class ClassUtil {
    /**
     * 扫描包，获取指定class的集合
     *
     * @param basePackage 基本包
     * @param filter      过滤器
     * @return {@link List}<{@link Class}<{@link ?}>>
     */
    public static List<Class<?>> scanPackage(String basePackage, Predicate<Class<?>> filter) {
        List<Class<?>> classList = new ArrayList<>();
        if (StringUtils.isEmpty(basePackage)) {
            return classList;
        }
        basePackage = basePackage.replace(".", "/") + "/";
        String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + basePackage + "**/*.class";
        try {
            // 对 basePackage 包进行扫描
            ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
            Resource[] resources = resourcePatternResolver.getResources(packageSearchPath);
            if (resources.length == 0) {
                return classList;
            }
            MetadataReaderFactory metadataReaderFactory = new SimpleMetadataReaderFactory();
            for (Resource resource : resources) {
                if (!resource.isReadable()) {
                    continue;
                }
                MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(resource);
                Class<?> clazz = Class.forName(metadataReader.getClassMetadata().getClassName());
                if (filter != null && !filter.test(clazz)) {
                    continue;
                }
                classList.add(clazz);
            }
        } catch (Exception e) {
            log.info("扫描 package 失败", e);
        }
        return classList;
    }
}

测试

public static void main(String[] args) {
        List<Class<?>> clazzList = scanPackage("com.fangye.base", Class::isEnum);
        for (Class<?> clazz : clazzList) {
            System.out.println(clazz);
            Object[] enumConstants = clazz.getEnumConstants();
            Arrays.stream(enumConstants).forEach(System.out::println);
        }
    }

运行结果

class com.fangye.base.enums.YesOrNoEnum
YES
NO