找到指定包名下的所有class

最新推荐文章于 2021-09-21 07:37:28 发布

最新推荐文章于 2021-09-21 07:37:28 发布 · 196 阅读

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本文介绍了一个用于查找指定包下所有类的Java程序。该程序利用Spring框架的资源解析和元数据读取功能，通过路径匹配获取类文件资源，并提取类名。示例中展示了如何搜索org.springframework.context.event包下的所有类。

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package test;

import java.io.IOException;
import java.util.LinkedHashSet;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanDefinitionStoreException;
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;

public class FindTargetPackageClass {
private static Log logger = LogFactory.getLog(FindTargetPackageClass.class);
protected static final String DEFAULT_RESOURCE_PATTERN = "**/*.class";

private ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();

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

private String resourcePattern = DEFAULT_RESOURCE_PATTERN;

    public static void main(String[] args) throws Exception {
        FindTargetPackageClass test = new FindTargetPackageClass();
        System.out.println(test.findTargetClassNames("org.springframework.context.event"));
    }
    public Set<String> findTargetClassNames(String basePackage) {
        Set<String> candidates = new LinkedHashSet<String>();
        try {
            String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX
                    + ClassUtils.convertClassNameToResourcePath(basePackage)
                    + "/" + this.resourcePattern;
            Resource[] resources = this.resourcePatternResolver
                    .getResources(packageSearchPath);
            for (int i = 0; i < resources.length; i++) {
                Resource resource = resources[i];
                MetadataReader metadataReader = this.metadataReaderFactory
                        .getMetadataReader(resource);
                String clazzName = metadataReader.getClassMetadata().getClassName();
                candidates
                        .add(clazzName);
                logger.debug("Find Class " + clazzName);
            }
        } catch (IOException ex) {
            throw new BeanDefinitionStoreException(
                    "I/O failure during classpath scanning", ex);
        }
        return candidates;
    }
}