新人仿照struts,mvc小试

新人模仿struts,mvc小试
web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<display-name>testmvc</display-name>
	<servlet>
		<servlet-name>actionServlet</servlet-name>
		<servlet-class>mvc.ActionServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>actionServlet</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
</web-app>

action-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<action-mapping>
	<action id="ac1" class="action.Action1"></action>
	<action id="ac2" class="action.Action2"></action>
</action-mapping>

ActionServlet.java

public class ActionServlet extends HttpServlet{
	private static final String ACTION_CONFIG_NAME = "action-config.xml";
	
	private static Document doc = null;
	
	private static Map<String,String> actionMap = null;
	@Override
	public void init() throws ServletException {
		try {
			initConfig();
			
		} catch (DocumentException e) {
			e.printStackTrace();
			System.exit(-1);
		}
		
	}
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		this.doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		String reqUri = fomartUri(req.getContextPath(), req.getRequestURI());
		if(actionMap.containsKey(reqUri)) {
			try {
				Class clazz = Class.forName(actionMap.get(reqUri));
				clazz.getMethod("execute",HttpServletRequest.class,HttpServletResponse.class).invoke(clazz.newInstance(),req,resp);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	private void initConfig() throws DocumentException {
		SAXReader reader = new SAXReader();
		doc = reader.read(ActionServlet.class.getClassLoader().getResourceAsStream(ACTION_CONFIG_NAME));
		actionMap = new HashMap<String, String>();
		Element element = null;
		for(Object obj : doc.selectNodes("/action-mapping/action")) {
			element = (Element)obj; 
			actionMap.put(element.attributeValue("id"), element.attributeValue("class"));
		}
	}

	// /testmvc/ac1.do
	private String fomartUri(String contextPath, String str) {
		return str.replaceAll(".do", "").replaceAll(contextPath + "/", "");
	}
}

Action1.java

public class Action1 {
	public void execute(HttpServletRequest req, HttpServletResponse resp) {
		try {
			resp.getWriter().println(Action1.class.getName());
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

用了dom4j解析xml配置文件,希望高手批评执教.