springboot中获取指定包下的包含某个注解的全部类

需求

获取spring项目里的带有某个注解的全部类

难点
需要扫描指定包路径下的类，同时也要扫描其下所有子包

思路

可以自己实现，推荐使用spring的工具类

代码

package com.example.demo; import com.example.demo.annos.MyAnno; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.boot.test.context.SpringBootTest; 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.test.context.junit4.SpringRunner; import org.springframework.util.ClassUtils; import java.io.IOException; import java.util.HashMap; import java.util.Map; @RunWith(SpringRunner.class) @SpringBootTest public class DemoApplicationTests { private final String BASE_PACKAGE = "com.example.demo"; private final String RESOURCE_PATTERN = "/**/*.class"; @Test public void test() { Map<String, Class> handlerMap = new HashMap<String, Class>(); //spring工具类，可以获取指定路径下的全部类 ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver(); try { String pattern = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + ClassUtils.convertClassNameToResourcePath(BASE_PACKAGE) + RESOURCE_PATTERN; Resource[] resources = resourcePatternResolver.getResources(pattern); //MetadataReader 的工厂类 MetadataReaderFactory readerfactory = new CachingMetadataReaderFactory(resourcePatternResolver); for (Resource resource : resources) { //用于读取类信息 MetadataReader reader = readerfactory.getMetadataReader(resource); //扫描到的class String classname = reader.getClassMetadata().getClassName(); Class<?> clazz = Class.forName(classname); //判断是否有指定主解 MyAnno anno = clazz.getAnnotation(MyAnno.class); if (anno != null) { //将注解中的类型值作为key，对应的类作为 value handlerMap.put(classname, clazz); } } } catch (IOException | ClassNotFoundException e) { } } }

 

本文转载自：https://www.cnblogs.com/lexiaoyao1995/p/13943784.html