java工厂系列设计模式源码与文档

public class ClassXmlPathApplicationContext implements BeanFactory { private Map<String, Object> map = new HashMap<String, Object>(); public ClassXmlPathApplicationContext(String fileName) throws Exception, IOException { SAXBuilder sb = new SAXBuilder(); Document document = sb.build(this.getClass().getClassLoader().getResourceAsStream(fileName)); Element root = document.getRootElement(); List list = XPath.selectNodes(root, "/beans/bean"); for(int i = 0;i<list.size();i++){ Element bean = (Element) list.get(i); String id = bean.getAttributeValue("id"); String clazz = bean.getAttributeValue("class"); map.put(id, Class.forName(clazz).newInstance()); } } @Override public Object getBean(String id) { return map.get(id); }