2022年黑马程序员工具类获取指定包名下的所有类

1、分享一种获取指定包名下所有类旳工具类，代码如下import java.io.File;import java.io.FileFilter;import java.lang.annotation.Annotation;import .JarURLConnection;import .URL;import java.util.ArrayList;import java.util.Enumeration;import java.util.List;import java.util.jar.JarEntry;import java.util.jar.JarFile;public class Class

2、Util / 获取指定包名下旳所有类 public static ListClass getClassList(String packageName, boolean isRecursive) ListClass classList = new ArrayListClass(); try Enumeration urls = Thread.currentThread().getContextClassLoader().getResources(packageName.replaceAll(., /); while (urls.hasMoreElements() URL url = urls.n

3、extElement(); if (url != null) String protocol = url.getProtocol(); if (protocol.equals(file) String packagePath = url.getPath(); addClass(classList, packagePath, packageName, isRecursive); else if (protocol.equals(jar) JarURLConnection jarURLConnection = (JarURLConnection) url.openConnection(); Jar

4、File jarFile = jarURLConnection.getJarFile(); Enumeration jarEntries = jarFile.entries(); while (jarEntries.hasMoreElements() JarEntry jarEntry = jarEntries.nextElement(); String jarEntryName = jarEntry.getName(); if (jarEntryName.endsWith(.class) String className = jarEntryName.substring(0, jarEntr

5、yName.lastIndexOf(.).replaceAll(/, .); if (isRecursive | className.substring(0, className.lastIndexOf(.).equals(packageName) classList.add(Class.forName(className); catch (Exception e) e.printStackTrace(); return classList; / 获取指定包名下旳所有类（可根据注解进行过滤） public static ListClass getClassListByAnnotation(St

6、ring packageName, Class annotationClass) ListClass classList = new ArrayListClass(); try Enumeration urls = Thread.currentThread().getContextClassLoader().getResources(packageName.replaceAll(., /); while (urls.hasMoreElements() URL url = urls.nextElement(); if (url != null) String protocol = url.get

7、Protocol(); if (protocol.equals(file) String packagePath = url.getPath(); addClassByAnnotation(classList, packagePath, packageName, annotationClass); else if (protocol.equals(jar) JarURLConnection jarURLConnection = (JarURLConnection) url.openConnection(); JarFile jarFile = jarURLConnection.getJarFi

8、le(); Enumeration jarEntries = jarFile.entries(); while (jarEntries.hasMoreElements() JarEntry jarEntry = jarEntries.nextElement(); String jarEntryName = jarEntry.getName(); if (jarEntryName.endsWith(.class) String className = jarEntryName.substring(0, jarEntryName.lastIndexOf(.).replaceAll(/, .); C

9、lass cls = Class.forName(className); if (cls.isAnnotationPresent(annotationClass) classList.add(cls); catch (Exception e) e.printStackTrace(); return classList; private static void addClass(ListClass classList, String packagePath, String packageName, boolean isRecursive) try File files = getClassFil

10、es(packagePath); if (files != null) for (File file : files) String fileName = file.getName(); if (file.isFile() String className = getClassName(packageName, fileName); classList.add(Class.forName(className); else if (isRecursive) String subPackagePath = getSubPackagePath(packagePath, fileName); Stri

11、ng subPackageName = getSubPackageName(packageName, fileName); addClass(classList, subPackagePath, subPackageName, isRecursive); catch (Exception e) e.printStackTrace(); private static File getClassFiles(String packagePath) return new File(packagePath).listFiles(new FileFilter() Override public boole

12、an accept(File file) return (file.isFile() & file.getName().endsWith(.class) | file.isDirectory(); ); private static String getClassName(String packageName, String fileName) String className = fileName.substring(0, fileName.lastIndexOf(.); if (mons.lang.StringUtil.isNotEmpty(packageName) className =

13、 packageName + . + className; return className; private static String getSubPackagePath(String packagePath, String filePath) String subPackagePath = filePath; if (mons.lang.StringUtil.isNotEmpty(packagePath) subPackagePath = packagePath + / + subPackagePath; return subPackagePath; private static Str

14、ing getSubPackageName(String packageName, String filePath) String subPackageName = filePath; if (mons.lang.StringUtil.isNotEmpty(packageName) subPackageName = packageName + . + subPackageName; return subPackageName; private static void addClassByAnnotation(ListClass classList, String packagePath, St

15、ring packageName, Class annotationClass) try File files = getClassFiles(packagePath); if (files != null) for (File file : files) String fileName = file.getName(); if (file.isFile() String className = getClassName(packageName, fileName); Class cls = Class.forName(className); if (cls.isAnnotationPresent(annotationClass) classList.add(cls); else String subPacka