ClassUtils.java
上传用户:hensond
上传日期:2021-12-27
资源大小:817k
文件大小:2k
- package com.company;
- import java.io.File;
- import java.io.IOException;
- import java.net.URL;
- import java.util.ArrayList;
- import java.util.Enumeration;
- import java.util.List;
- /**
- * @author cbf4Life cbf4life@126.com I'm glad to share my knowledge with you
- * all.
- *
- */
- @SuppressWarnings("all")
- public class ClassUtils {
-
- //根据父类查找到所有的子类,默认情况是子类和父类都在同一个包名下
- public static List<Class> getSonClass(Class fatherClass){
- //定义一个返回值
- List<Class> returnClassList = new ArrayList<Class>();
- //获得包名称
- String packageName = fatherClass.getPackage().getName();
- //获得包中的所有类
- List<Class> packClasses = getClasses(packageName);
- //判断是否是是子类
- for(Class c:packClasses){
- if(fatherClass.isAssignableFrom(c) && !fatherClass.equals(c)){
- returnClassList.add(c);
- }
- }
- return returnClassList;
- }
-
-
- //从一个包中查找出所有的类,在jar包中不能查找
- private static List<Class> getClasses(String packageName) {
- ClassLoader classLoader = Thread.currentThread()
- .getContextClassLoader();
- String path = packageName.replace('.', '/');
- Enumeration<URL> resources = null;
- try {
- resources = classLoader.getResources(path);
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- List<File> dirs = new ArrayList<File>();
- while (resources.hasMoreElements()) {
- URL resource = resources.nextElement();
- dirs.add(new File(resource.getFile()));
- }
- ArrayList<Class> classes = new ArrayList<Class>();
- for (File directory : dirs) {
- classes.addAll(findClasses(directory, packageName));
- }
- return classes;
- }
-
-
- private static List<Class> findClasses(File directory, String packageName) {
- List<Class> classes = new ArrayList<Class>();
- if (!directory.exists()) {
- return classes;
- }
- File[] files = directory.listFiles();
- for (File file : files) {
- if (file.isDirectory()) {
- assert !file.getName().contains(".");
- classes.addAll(findClasses(file, packageName + "." + file.getName()));
- } else if (file.getName().endsWith(".class")) {
- try {
- classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
- } catch (ClassNotFoundException e) {
- e.printStackTrace();
- }
- }
- }
- return classes;
- }
- }