需求
獲取spring項目里的帶有某個注解的全部類
難點
需要掃描指定包路徑下的類，同時也要掃描其下所有子包
思路
可以自己實現，推薦使用spring的工具類
代碼
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工具類，可以獲取指定路徑下的全部類 ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver(); try { String pattern = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + ClassUtils.convertClassNameToResourcePath(BASE_PACKAGE) + RESOURCE_PATTERN; Resource[] resources = resourcePatternResolver.getResources(pattern); //MetadataReader 的工廠類 MetadataReaderFactory readerfactory = new CachingMetadataReaderFactory(resourcePatternResolver); for (Resource resource : resources) { //用於讀取類信息 MetadataReader reader = readerfactory.getMetadataReader(resource); //掃描到的class String classname = reader.getClassMetadata().getClassName(); Class<?> clazz = Class.forName(classname); //判斷是否有指定主解 MyAnno anno = clazz.getAnnotation(MyAnno.class); if (anno != null) { //將注解中的類型值作為key，對應的類作為 value handlerMap.put(classname, clazz); } } } catch (IOException | ClassNotFoundException e) { } } }
本文轉載自：https://www.cnblogs.com/lexiaoyao1995/p/13943784.html