利用Spring的包扫描代码，实现自定义包扫描， 代码可直接使用

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.util.ClassUtils;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

/**
 * @author Adam  
 * @version 1.0  
 * @date 2015-10-30  
 */
public class ClassScanner {
    private static final Logger logger = LoggerFactory.getLogger(ClassScanner.class);

    public static List<Class> scan(String scanPackage) {
        List<Class> clazzs = new LinkedList<Class>();
        String pattern = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + ClassUtils.convertClassNameToResourcePath(scanPackage) + "/**/*.class";
        try {             
            // 扫描包 然后加载class
            ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
            Resource[] resources = resourcePatternResolver.getResources(pattern);
            MetadataReaderFactory readerFactory = new CachingMetadataReaderFactory(resourcePatternResolver);
            for (Resource resource : resources) {
                if (resource.isReadable()) {
                    MetadataReader reader = readerFactory.getMetadataReader(resource);
                    String className = reader.getClassMetadata().getClassName();
                    logger.info("scanned class {}", className);
                    Class clazz = Class.forName(className);
                    clazzs.add(clazz);
                }
            }
        } catch (ClassNotFoundException e) {
            logger.error(e.getMessage(), e);
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
        }

        return clazzs;
    }

}

Q.E.D.