参考mybatis MapperScannerConfigurer.java

Spring根据包名获取包路径下的所有类-LMLPHP

最终找到 Spring的一个类  ClassPathBeanDefinitionScanner.java

参考ClassPathBeanDefinitionScanner 和它的父类 ClassPathScanningCandidateComponentProvider,将一些代码进行抽取,得到如下工具类。

import org.apache.commons.lang3.ArrayUtils;
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.StringUtils;
import org.springframework.util.SystemPropertyUtils; 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; public class ClassScaner implements ResourceLoaderAware { //保存过滤规则要排除的注解
private final List<TypeFilter> includeFilters = new LinkedList<TypeFilter>();
private final List<TypeFilter> excludeFilters = new LinkedList<TypeFilter>(); private ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
private MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(this.resourcePatternResolver); public static Set<Class> scan(String[] basePackages,
Class<? extends Annotation>... annotations) {
ClassScaner cs = new ClassScaner(); if(ArrayUtils.isNotEmpty(annotations)) {
for (Class 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 static Set<Class> scan(String basePackages, Class<? extends Annotation>... annotations) {
return ClassScaner.scan(StringUtils.tokenizeToStringArray(basePackages, ",; \t\n"), annotations);
} public final ResourceLoader getResourceLoader() {
return this.resourcePatternResolver;
} public void setResourceLoader(ResourceLoader resourceLoader) {
this.resourcePatternResolver = ResourcePatternUtils
.getResourcePatternResolver(resourceLoader);
this.metadataReaderFactory = new CachingMetadataReaderFactory(
resourceLoader);
} 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 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.scan("com.hjzgg.test.thirdjar.config,com.hjzgg.test.thirdjar.web", null)
.forEach(clazz -> System.out.println(clazz));
}
}
05-11 15:39
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