简洁自定义框架的开发步骤

1、定义Action接口
public interface Action {
public String execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception;
}

2、实现自定义Action接口
public class LoginAction implements Action {
public String execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  String name = request.getParameter("uid");
  String password = request.getParameter("pwd");
  // 业务处理
  CustomerBiz ub = new CustomerBizImpl();
  Customer user = ub.login(name, password);
  // 判断登录是否成功
  if (user == null) {
   request.setAttribute("message", "用户名或密码错误");
   return "login.jsp";
  } else {
   request.getSession().setAttribute("login", user);
   return "index.jsp";
  }
}

}

3、实现Controller类ActionServlet
   1）获取自定义Action
public Action getAction(HttpServletRequest request){
      //获取请求的uri
      String uri = request.getRequestURI();
      //获取上下文路径
      String contextPath = request.getContextPath();
      //截取上下文路径以后的部分
      String actionPath = uri.substring(contextPath.length());
      //获取Action 名称
      String actionName =                
      actionPath.substring(1,actionPath.lastIndexOf('.')).trim();
      Action action = null;
     //添加新功能时在这里添加
     if("login".equals(actionName)){
            action = new LoginAction();
      }
     return action;
    }

   2）调用execute方法
    public void doGet(HttpServletRequestrequest,
               HttpServletResponse response) throws Exception {
              //获得Action
              Action action = this.getAction(request);
              //调用Action execute 方法
              String resultView = action.execute(request, response);
       //actionMapping
              request.getRequestDispatcher(resultView).forward(
      request, response);
       }


4、配置ActionServlet
   1）修改web.xml文件，配置ActionServlet
<servlet>
          <servlet-name>ActionServlet</servlet-name>
          <servlet-class>*.*.ActionServlet</servlet-class>
        </servlet>
     <servlet-mapping>
          <servlet-name>ActionServlet</servlet-name>
          <url-pattern>*.action</url-pattern>
     </servlet-mapping>

5、上面只能接受一个action处理，如果有多个action，如何接收呢？
   2）Controller的完善ActionServlet，增加架构配置文件mystruts.xml
   3）保存Action信息，修改Action，ActionMapping，保存配置的Result 属性信息Map<String,String>
   4）读取Action信息，修改ActionServlet的init方法
   5）使用反射生成Action，ActionManager的createAction方法用来获取Action实例
   6）loadClass方法动态加载类ActionManager，loadClass方法动态加载类
   7）修改ActionServlet配置信息
        <servlet>
  <servlet-name>ActionServlet</servlet-name>
  <servlet-class>com.birlt.dangdang.servlet.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>mystruts.xml</param-value>
  </init-param>
  <load-on-startup>0</load-on-startup>
</servlet>


6、完善视图
   1）保存视图Result类
   2）修改ActionMapping，保存配置的Result 属性信息Map<String,Result>
   3）增加ActionMappingManager类
   4）修改ActionServlet,需要修改init方法，并将getAction改为getActionMapping，并将修改获取mapping内容


7、注册完成功能