Struts的原型解析实例

package com.lzq.servlet; import java.io.InputStream; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.SAXReader; public class XmlConfigReader { private static XmlConfigReader instance=new XmlConfigReader(); ActionMapping actionMapping=new ActionMapping(); private Document doc; private Map actionMap=new HashMap(); private XmlConfigReader(){ try { SAXReader reader=new SAXReader(); InputStream in=Thread.currentThread().getContextClassLoader().getResourceAsStream("action_config.xml"); doc=reader.read(in); } catch (DocumentException e) { e.printStackTrace(); } } public ActionMapping getActionMapping(String path){ synchronized(this){ Object type=null; /*if(action.containsKey(path)){ type=action.get(path); }*/ Element eltAction = (Element)doc.selectObject("//action[@path=\"" + path + "\"]"); try{ type=Class.forName(eltAction.attributeValue("type")).newInstance(); }catch(Exception e){ e.printStackTrace(); } Element eltForwards = eltAction.element("forward"); for (Iterator iter = eltForwards.elementIterator(); iter.hasNext();) { Element eltForward = (Element) iter.next(); actionMap.put(eltForward.attributeValue("name"),eltForward.getTextTrim()); } actionMapping.setPath(path); actionMapping.setType(type); actionMapping.setForwardMap(actionMap); return actionMapping; } } public static synchronized XmlConfigReader getInstance(){ return instance; } /** * 测试读取 * @param args */ public static void main(String[] args) { ActionMapping actionMapping=XmlConfigReader.getInstance().getActionMapping("/servlet/delUser"); System.out.println(actionMapping.getPath()); System.out.println(actionMapping.getType()); System.out.println(actionMapping.getForwardMap().toString()); } }