[Spring] Package Class 탐색

import java.io.IOException;

import java.util.LinkedHashSet;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.ScannedGenericBeanDefinition;
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 org.springframework.util.SystemPropertyUtils;

public class PackageClassScanner {

	private Logger logger = LoggerFactory.getLogger(this.getClass());

	private static final String DEFAULT_RESOURCE_PATTERN = "**/*.class";
	private String resourcePattern = DEFAULT_RESOURCE_PATTERN;
	private String _basePackage = "";

	public PackageClassScanner() {
	}

	public void setPackageName(String basePackage) {
		_basePackage = basePackage;
	}

	public Set getClasses() {
        Set candidates = new LinkedHashSet();
        ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
        MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resourcePatternResolver);

        String packageSearchPath =
        		ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +
        		ClassUtils.convertClassNameToResourcePath(SystemPropertyUtils.resolvePlaceholders(_basePackage)) + 
        		resourcePattern;
        try {
        	Resource[] resources = resourcePatternResolver.getResources(packageSearchPath);
            for (Resource resource : resources) {
                if (resource.isReadable()) {
                    try {
                        MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(resource);
                        ScannedGenericBeanDefinition sbd = new ScannedGenericBeanDefinition(metadataReader);
                        sbd.setResource(resource);
                        sbd.setSource(resource);
                        candidates.add(sbd);
                    } catch (Throwable ex) {
                        throw new BeanDefinitionStoreException("Failed to read candidate component class: " + resource, ex);
					}
				} else {
					logger.trace("Ignored because not readable: " + resource);
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}

		return candidates;
	}
}

펌 : https://groups.google.com/forum/#!topic/ksug/pyRsO_OHvuU