简单自定义框架-帮助你理解SSH框架的原理

package y2ssh.sg.chp1.framework; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import y2ssh.sg.chp1.action.MultiAction; import y2ssh.sg.chp1.action.loginAction; /** * 自定义MVC框架：基于Servlet实现的控制器 * @author 北大青鸟 */ public class Controller extends HttpServlet { private static final long serialVersionUID = 1595433834962010235L; /** * 根据path判断由哪个action执行操作。 */ private Action determinActionByPath( HttpServletRequest request) { Action ret = null; //得到请求路径，如：http://localhost:8080/zf/add.do String path = request.getServletPath(); //如：从http://localhost:8080/zf/add.do中得到add String actionName = path.substring( path.lastIndexOf('/') + 1, path.length() - 3); //添加新功能时在这里添加 if("m".equals(actionName)){ ret = new MultiAction(); } else if("login".equals(actionName)) ret=new loginAction(); return ret; } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 1.得到要调用的Action Action action = (Action)this.determinActionByPath(request); // 2.调用action的execute方法 String resultView = action.execute(request,response); // 3.页面转向 if (null!=resultView){ request.getRequestDispatcher(resultView). forward(request, response); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } }