SpringIOC原理实现

package com.springIoc.container; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.InvocationTargetException; import java.util.HashMap; import java.util.Map; import java.util.Properties; import org.apache.commons.beanutils.PropertyUtils; /** * 相当于spring容器，用来保存bean * @author yj.shi * */ public class Container { private static Map<String,Object> map=new HashMap<String,Object>(); public Container(){ Properties properties=new Properties(); InputStream in = null; try { in=Container.class.getClassLoader().getResourceAsStream("ioc.properties"); properties.load(in); for(Map.Entry<Object, Object> entity:properties.entrySet()){ String key=entity.getKey().toString(); String value=entity.getValue().toString(); mappeingBean(key,value); } } catch (Exception e) { e.printStackTrace(); } finally{ if(in!=null){ try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * 对properties的内容进行映射 * @param key * @param value * @throws ClassNotFoundException * @throws IllegalAccessException * @throws InstantiationException * @throws NoSuchMethodException * @throws InvocationTargetException */ private void mappeingBean(String key,String value) throws InstantiationException, IllegalAccessException, ClassNotFoundException, InvocationTargetException, NoSuchMethodException{ String[] parts=key.split("\\."); if(parts.length==1){ map.put(parts[0],Class.forName(value).newInstance() ); }else{ Object target=getBeanById(parts[0]); Object resource=getBeanById(value); PropertyUtils.setProperty(target, parts[1], resource); } } /** * 通过key过去spring容器中的数据 * @param key * @return */ public static Object getBeanById(String key){ return map.get(key); } }