手写IOC项目，学习理解Spring IOC原理

package com.hand.bean; import com.hand.MyLog; import com.hand.anno.Bean; import com.hand.anno.Di; import java.io.File; import java.lang.reflect.Field; import java.net.URL; import java.net.URLDecoder; import java.util.Enumeration; import java.util.HashMap; import java.util.Map; public class AnnoApplicationContext implements ApplicationContext { private String rootPath = null; private Map<Class, Object> beanFactory = new HashMap<>(); @Override public Object getBean(Class clazz) { return beanFactory.get(clazz); } public AnnoApplicationContext(String packageStr) { try { String packagePath = packageStr.replaceAll("\\.", "\\\\"); Enumeration<URL> resources = Thread.currentThread().getContextClassLoader().getResources(packagePath); while (resources.hasMoreElements()) { URL url = resources.nextElement(); String filePath = URLDecoder.decode(url.getFile(), "utf-8"); // MyLog.logger.info(filePath); rootPath = filePath.substring(0, filePath.length() - packagePath.length()); loadBean(new File(filePath)); } } catch (Exception e) { e.printStackTrace(); } loadDi(); } /** * 对象加入容器 */ private void loadBean(File file) throws Exception { if (file.isDirectory()) { File[] childFiles = file.listFiles(); if (childFiles == null || childFiles.length == 0) { return; } for (File childFile : childFiles) { if (childFile.isDirectory()) { loadBean(childFile); continue; } String pathWhitClass = childFile.getAbsolutePath().substring(rootPath.length() - 1); if (!pathWhitClass.contains(".class")) { continue; } String allName = pathWhitClass.replaceAll("\\\\", ".").replace(".class", ""); MyLog.logger.info("类：" + allName); Class<?> clazz = Class.forName(allName); if (clazz.isInterface()) { continue; } Bean bean = clazz.getAnnotation(Bean.class); if (bean != null) { Object instance = clazz.getConstructor().newInstance(); if (clazz.getInterfaces().length > 0) { beanFactory.put(clazz.getInterfaces()[0], instance); } else { beanFactory.put(clazz, instance); } } } } } /** * 依赖注入 */ private void loadDi() { for (Object obj : beanFactory.values()) { Class<?> clazz = obj.getClass(); Field[] declaredFields = clazz.getDeclaredFields(); for (Field field : declaredFields) { Di di = field.getAnnotation(Di.class); if (di == null) { continue; } field.setAccessible(true); try { field.set(obj, beanFactory.get(field.getType())); } catch (IllegalAccessException e) { e.printStackTrace(); } } } } }