java扫描源码或者jar包中的class文件

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternUtils;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.core.type.filter.TypeFilter;
import org.springframework.util.SystemPropertyUtils;

public class ClassScaner implements ResourceLoaderAware {

private ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();

private final List<TypeFilter> includeFilters = new LinkedList<TypeFilter>();

private final List<TypeFilter> excludeFilters = new LinkedList<TypeFilter>();

private MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(this.resourcePatternResolver);

public ClassScaner() {

}

public void setResourceLoader(ResourceLoader resourceLoader) {
this.resourcePatternResolver = ResourcePatternUtils
.getResourcePatternResolver(resourceLoader);
this.metadataReaderFactory = new CachingMetadataReaderFactory(
resourceLoader);
}

public final ResourceLoader getResourceLoader() {
return this.resourcePatternResolver;
}

public void addIncludeFilter(TypeFilter includeFilter) {
this.includeFilters.add(includeFilter);
}

public void addExcludeFilter(TypeFilter excludeFilter) {
this.excludeFilters.add(0, excludeFilter);
}

public void resetFilters(boolean useDefaultFilters) {
this.includeFilters.clear();
this.excludeFilters.clear();
}

public static Set<Class<?>> scan(String basePackage, Class<? extends Annotation>... annotations) {
ClassScaner cs = new ClassScaner();
for (Class<? extends Annotation> anno : annotations){
cs.addIncludeFilter(new AnnotationTypeFilter(anno));
}
return cs.doScan(basePackage);
}

public static Set<Class<?>> scan(String[] basePackages, Class<? extends Annotation>... annotations) {
ClassScaner cs = new ClassScaner();
for (Class<? extends Annotation> anno : annotations){
cs.addIncludeFilter(new AnnotationTypeFilter(anno));
}
Set<Class<?>> classes = new HashSet<Class<?>>();
for (String s : basePackages)
classes.addAll(cs.doScan(s));
return classes;
}

public Set<Class<?>> doScan(String basePackage) {
Set<Class<?>> classes = new HashSet<Class<?>>();
try {
String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX+ org.springframework.util.ClassUtils.convertClassNameToResourcePath(SystemPropertyUtils.resolvePlaceholders(basePackage)) + "/**/*.class";
Resource[] resources = this.resourcePatternResolver
.getResources(packageSearchPath);

for (int i = 0; i < resources.length; i++) {
Resource resource = resources[i];
if (resource.isReadable()) {
MetadataReader metadataReader = this.metadataReaderFactory
.getMetadataReader(resource);
if ((includeFilters.size() == 0 && excludeFilters.size() == 0)
|| matches(metadataReader)) {
try {
classes.add(Class.forName(metadataReader.getClassMetadata().getClassName()));
} catch (ClassNotFoundException e) {
e.printStackTrace();
}

}
}
}
} catch (IOException ex) {
throw new BeanDefinitionStoreException(
"I/O failure during classpath scanning", ex);
}
return classes;
}

protected boolean matches(MetadataReader metadataReader) throws IOException {
for (TypeFilter tf : this.excludeFilters) {
if (tf.match(metadataReader, this.metadataReaderFactory)) {
return false;
}
}
for (TypeFilter tf : this.includeFilters) {
if (tf.match(metadataReader, this.metadataReaderFactory)) {
return true;
}
}
return false;
}

public static void main(String[] args) {
ClassScaner cs = new ClassScaner();
Set<Class<?>> clazz = cs.doScan("com.test.util");
System.out.println( clazz );
}

}